CN109225213A - Preparation method of close-coupled three-way catalyst for motor vehicle exhaust purification - Google Patents
Preparation method of close-coupled three-way catalyst for motor vehicle exhaust purification Download PDFInfo
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- CN109225213A CN109225213A CN201811166126.0A CN201811166126A CN109225213A CN 109225213 A CN109225213 A CN 109225213A CN 201811166126 A CN201811166126 A CN 201811166126A CN 109225213 A CN109225213 A CN 109225213A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 45
- 238000000746 purification Methods 0.000 title abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 96
- 239000002131 composite material Substances 0.000 claims abstract description 79
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 60
- OERNJTNJEZOPIA-UHFFFAOYSA-N zirconium nitrate Chemical compound [Zr+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O OERNJTNJEZOPIA-UHFFFAOYSA-N 0.000 claims abstract description 46
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000919 ceramic Substances 0.000 claims abstract description 33
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 28
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims abstract description 24
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 20
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 6
- 239000010948 rhodium Substances 0.000 claims abstract description 6
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 241000264877 Hippospongia communis Species 0.000 claims description 28
- 239000000843 powder Substances 0.000 claims description 28
- 239000007787 solid Substances 0.000 claims description 28
- 229920001214 Polysorbate 60 Polymers 0.000 claims description 20
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 18
- 239000000908 ammonium hydroxide Substances 0.000 claims description 18
- 238000000498 ball milling Methods 0.000 claims description 18
- 229910001593 boehmite Inorganic materials 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 18
- 238000010168 coupling process Methods 0.000 claims description 18
- 238000005859 coupling reaction Methods 0.000 claims description 18
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 18
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 14
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 claims description 11
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 claims description 10
- YWECOPREQNXXBZ-UHFFFAOYSA-N praseodymium(3+);trinitrate Chemical compound [Pr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YWECOPREQNXXBZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000010970 precious metal Substances 0.000 claims description 9
- 230000004584 weight gain Effects 0.000 claims description 6
- 235000019786 weight gain Nutrition 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 229910003158 γ-Al2O3 Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims 2
- 238000009833 condensation Methods 0.000 claims 2
- 230000005494 condensation Effects 0.000 claims 2
- 229910017604 nitric acid Inorganic materials 0.000 claims 2
- 229910000510 noble metal Inorganic materials 0.000 abstract description 6
- 239000011149 active material Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- JSLPYMQWMAAGGH-UHFFFAOYSA-N nitric acid;praseodymium Chemical compound [Pr].O[N+]([O-])=O JSLPYMQWMAAGGH-UHFFFAOYSA-N 0.000 description 1
- DAHVGXJQRTYNST-UHFFFAOYSA-N nitric acid;yttrium Chemical compound [Y].O[N+]([O-])=O DAHVGXJQRTYNST-UHFFFAOYSA-N 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a preparation method of a close-coupled three-way catalyst for purifying motor vehicle exhaust, which belongs to the field of automobile exhaust purification2O3Then adding hydrogen peroxide and citric acid to prepare a composite material A; dissolving cerium nitrate, zirconium nitrate, lanthanum nitrate and yttrium nitrate in sequence, and adding gamma-Al while stirring2O3Then adding hydrogen peroxide and citric acid to prepare a composite material B; and then taking the composite material A and noble metal palladium as a first coating on the honeycomb ceramic carrier, and taking the composite material B and noble metal rhodium as a second coating to obtain the catalyst. According to the invention, the catalyst active material is coated in a quantitative layered manner by blending the proportions of different rare earths of the catalyst material, so that the high-temperature sintering resistance of the catalyst is improved, and the finished product is coated at the airspeed of 80000h‑1Under the condition, after the catalyst is operated for 50 hours at the high temperature of 950 ℃, the catalyst can still maintain the efficient exhaust gas purification performance.
Description
Technical field
The present invention relates to a kind of motor vehicle tail-gas purifying preparation methods of close coupling three-way catalyst, and it is net to belong to vehicle exhaust
Change field.
Background technique
The call of national energy conservation and emission reduction is answered, nowadays the compact car of compact arrangement becomes mainstream, and enging cabin is for arranging
The space of catalyst is more and more limited, so that catalyst carrier becomes smaller, catalyst reaction air speed requires to increase, turns to catalyst
The elevator belt for changing effect carrys out very big difficulty.
Current most effective administering method is to install catalytic converter additional in engine exhaust system, is being arranged vehicle exhaust
Catalyzed conversion is carried out before putting, the basic principle is that by the effect of catalyst, CO, HC, NOXIt aoxidizes, be reduced to people respectively
Harmless carbon dioxide (the CO of body health2), nitrogen (N2) and vapor (H2O), in the conversion process, if catalyst can be simultaneously
Catalytic purification is played to tri- kinds of nuisances of CO, HC, NOx, this catalyst is known as three-way catalyst.
It is gradually stringent with national environmental protection regulation, the extension of catalyst converter service life is also required higher and higher.Close coupling
Three-way catalyst is since closer to engine exhaust end, operating temperature is also relatively higher, so for the durability of catalyst
Propose requirements at the higher level.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of motor vehicle tail-gas purifying close coupling three-effect catalysis
The preparation method of agent, catalyst, which is made, has good high high-temp stability, and excellent catalytic effect.
To achieve the goals above, a kind of preparation for motor vehicle tail-gas purifying close coupling three-way catalyst that the present invention uses
Method, comprising the following steps:
1) preparation of composite A
Cerous nitrate, zirconium nitrate, lanthanum nitrate, praseodymium nitrate are weighed in proportion to be successively dissolved in pure water, and γ-is added in stirring
Al2O3, hydrogen peroxide is added, stirs, citric acid is then added, ammonium hydroxide is added after stirring and adjusts pH value, filters and washes after ageing
It washs, solid roasting is up to composite A；
2) preparation of composite material B
Cerous nitrate, zirconium nitrate, lanthanum nitrate, yttrium nitrate are weighed in proportion to be successively dissolved in pure water, and γ-is added in stirring
Al2O3, hydrogen peroxide is added, is stirred, citric acid is then added, stirring adds appropriate ammonium hydroxide and adjusts pH value, filters and washes after ageing
It washs, solid roasting obtains composite material B；
3) preparation of catalyst coat material
Composite A, boehmite, pure water, palladium nitrate, mixing and ball milling Control granularity 3a) is made in appropriate step 1)
D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content 25-35%, Tween-60 is added dropwise after stirring, after being stirred for
With nitre acid for adjusting pH value, honeycomb ceramic carrier is then quantitatively coated, up to the bee of coating composite materials A, precious metal palladium after drying
Nest ceramic monolith；
Composite material B, boehmite, pure water, rhodium nitrate, mixing and ball milling, Control granularity D 3b) is made in step 2)50=
It 5 μm, moves in stirring container plus pure water modulates slurry solid content 25-35%, Tween-60 is added after stirring, with appropriate nitre after stirring
Acid for adjusting pH value, quantitative coating step 3a) obtained honeycomb ceramic carrier, it is dry after coating composite materials B, Noble Metal Rhodium
Honeycomb ceramic carrier.
As an improvement, in the step 1) composite A preparation, specifically includes the following steps:
By mass percentage, cerous nitrate 20-40%, zirconium nitrate 20-40%, lanthanum nitrate 3-8%, praseodymium nitrate 3- are weighed
8%, it is successively dissolved in pure water, γ-Al is added in stirring2O320-40%, wherein cerous nitrate, zirconium nitrate, lanthanum nitrate, nitric acid
Praseodymium and γ-Al2O3Total amount be 100%, add the hydrogen peroxide of dry powder weight 2-3%, stir 30-50min, be then added dry
The citric acid of powder weight 5-10% stirs 30-50min, and adding ammonium hydroxide and adjusting pH value is 8-9, is aged 5-10 hour, filters
After washing, solid is in 600-700 DEG C of high temperature kiln roasting 3-5h to get composite A.
As an improvement, the preparation of step 2) the composite material B, specifically includes the following steps:
By mass percentage, cerous nitrate 10-20%, zirconium nitrate 20-40%, lanthanum nitrate 3-8%, yttrium nitrate 3- are weighed
8%, it is successively dissolved in pure water, γ-Al is added in stirring2O340-50%, wherein cerous nitrate, zirconium nitrate, lanthanum nitrate, nitric acid
Yttrium, γ-Al2O3Total amount be 100%, add the hydrogen peroxide of the 2-3% of dry powder weight, stir 30-50min, be then added dry
The citric acid of powder weight 5-10% stirs 30-50min, and adding ammonium hydroxide and adjusting pH value is 8-9, is aged 5-10 hour, filters
After washing, solid is in 600-700 DEG C of high temperature kiln roasting 3-5h to get composite material B.
As an improvement, the step 3a), specifically includes the following steps:
By weight, 850-900 parts of composite As, 100-120 parts of boehmite, pure water 1800-2200 are weighed
Part, 140-150 parts of palladium nitrate, ball milling 30-50min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry
Solid content 25-35% is added dropwise Tween-60 50-60 parts after stirring 25-35min, stirs 20-40min, be with nitre acid for adjusting pH value
3-5；Then honeycomb ceramic carrier is quantitatively coated, prior to 95-100 DEG C dry 2-4h roasts 3-5 then at 450-550 DEG C of high temperature furnace
Hour, the i.e. honeycomb ceramic carrier of coating composite materials A, precious metal palladium.
As an improvement, the step 3b), specifically includes the following steps:
By weight, 850-900 parts of composite material B, 100-120 parts of boehmite, pure water 1800-2200 are weighed
Part, 20-24 parts of rhodium nitrate, ball milling 30-50min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulation slurry is solid
Content 25-35% adds Tween-60 50-60 parts after stirring 25-35min, stirs 20-40min, be 3-5 with nitre acid for adjusting pH value；
Quantitative coating step 3a) obtained honeycomb ceramic carrier, then at 95-100 DEG C of dry 2-4h, then in 450-550 DEG C of high temperature
Furnace roasts 3-5 hours to get finished catalyst.
As an improvement, the concentration of the palladium nitrate is 15%, the concentration of rhodium nitrate is 10%.
As an improvement, the Tween-60 is pure using analyzing.
As an improvement, the preparation method the following steps are included:
1) preparation of composite A
By mass percentage, cerous nitrate 30%, zirconium nitrate 30%, lanthanum nitrate 5%, praseodymium nitrate 5% is weighed successively to dissolve
In pure water, γ-Al is added in stirring2O330%, add dry powder weight 2.5% hydrogen peroxide stir 40 minutes, then plus
Enter the citric acid of dry powder weight 8%, stir 40 minutes, adding ammonium hydroxide and adjusting pH value is 9,7 hours is aged, after filtering and washing
Composite material high temperature kiln roasting 4 hours of 650 DEG C to get composite A；
2) preparation of composite material B
By mass percentage, cerous nitrate 15%, zirconium nitrate 30%, lanthanum nitrate 5%, yttrium nitrate 5% is weighed successively to dissolve
In pure water, γ-Al is added in stirring2O345%, add dry powder weight 2.5% hydrogen peroxide stir 40 minutes, then plus
Enter the citric acid of dry powder weight 8%, stir 40 minutes, adding ammonium hydroxide and adjusting pH value is 9,7 hours is aged, after filtering and washing
Composite material high temperature kiln roasting 4 hours of 650 DEG C to get composite material B；
3) preparation of catalyst coat material
It 3a) weighs 888.89g step 1) and composite A, boehmite 111.11g, pure water 2000g, palladium nitrate is made
147.14g, ball milling 40min, Control granularity D50It=5 μm, moves in stirring container, adds pure water to modulate slurry solid content 30%, stir
30 minutes dropwise addition Tween-60 56g are mixed, are stirred for 30 minutes, are 4.0 with nitre acid for adjusting pH value, ceramic honey comb is quantitatively coated and carries
Body, 3 hours dry in 100 DEG C, 500 DEG C of furnaces of high temperature roast 4 hours to get coating composite materials A, the ceramic honey comb of precious metal palladium
Carrier；
It 3b) weighs 888.89g step 2) and composite material B, boehmite 111.11g, pure water 2000g, rhodium nitrate is made
22.07g, ball milling 40min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content 30%, stirring
After 30 minutes plus Tween-60 56g, be stirred for 30min, be 4.0 with nitre acid for adjusting pH value, quantitative coating step 3a) made from bee
3 hours dry then at 100 DEG C on nest ceramic monolith, 500 DEG C of furnaces of high temperature roast 4 hours to get finished catalyst.
As an improvement, the step 3a) made from the dry weight gain 120g/L of composite A, noble metal in honeycomb ceramic carrier
Palladium content 75g/ft3。
As an improvement, the step 3b) finished catalyst in the dry weight gain 80g/L of composite material B, Noble Metal Rhodium content
5g/ft3。
Compared with prior art, the present invention is using activated alumina and different rare earth composition synthetic catalyst activity materials
Material efficiently solves the problems, such as rare earth material storage oxygen and bigger serface, catalyst carrier becomes smaller, catalyst reaction air speed becomes
In the case where big, to guarantee that the high activity of catalytic performance provides favourable conditions.The present invention is with the quantitative double-deck paint-on technique system
At catalyst, it is ensured that catalyst keeps longer service life in the case of a high temperature；The present invention is contained using reasonable noble metal
Amount and simple production technology, compared to the paint-on technique of conventionally employed multilayer complexity and the technique of high-content noble metal, originally
Production cost is greatly saved in invention, is relatively beneficial to the control of industrialized production.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention is carried out below further detailed
It describes in detail bright.However, it should be understood that the specific embodiments described herein are merely illustrative of the present invention, it is not limited to this hair
Bright range.
Unless otherwise defined, all technical terms and scientific terms used herein are led with technology of the invention is belonged to
The normally understood meaning of the technical staff in domain is identical, and term as used herein in the specification of the present invention is intended merely to retouch
State the purpose of specific embodiment, it is not intended that in the limitation present invention.
Embodiment 1
A kind of preparation method of motor vehicle tail-gas purifying close coupling three-way catalyst, comprising the following steps:
1) preparation of composite A
By mass percentage, cerous nitrate 20%, zirconium nitrate 25%, lanthanum nitrate 5%, praseodymium nitrate 5% are weighed, is successively dissolved
In pure water, γ-Al is added in stirring2O335%, the hydrogen peroxide of dry powder weight 2% is added, 30min is stirred, is then added
The citric acid of dry powder weight 5% stirs 30min, and adding ammonium hydroxide and adjusting pH value is 8, is aged 5.5 hours, after filtering and washing,
Solid is in 600 DEG C of high temperature kiln roasting 3h to get composite A；
2) preparation of composite material B
By mass percentage, cerous nitrate 10%, zirconium nitrate 30%, lanthanum nitrate 7%, yttrium nitrate 8% are weighed, is successively dissolved
In pure water, γ-Al is added in stirring2O345%, add 2% hydrogen peroxide of dry powder weight, stir 30min, then plus
Enter the citric acid of dry powder weight 5%, stirs 30min, adding ammonium hydroxide and adjusting pH value is 8, it is aged 5 hours, after filtering and washing,
Solid is in 600 DEG C of high temperature kiln roasting 5h to get composite material B；
3) preparation of catalyst coat material
3a) by weight, weighing 850g composite A, boehmite 100g, pure water 1800g, concentration is 15%
Palladium nitrate 140g, ball milling 30min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content 25%,
The pure Tween-60 50g of analysis is added dropwise after stirring 25min, stirs 20min, is 3 with nitre acid for adjusting pH value；Then honeycomb is quantitatively coated
Ceramic monolith, prior to 95 DEG C dry 4h roast 5 hours then at 450 DEG C of high temperature furnaces to get coating composite materials A, precious metal palladium
Honeycomb ceramic carrier；
3b) weigh the composite material B, boehmite 100g, pure water 1800g, the rhodium nitrate that concentration is 10% of 850g
20g, ball milling 30min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content 25%, stirring
Pure 50 parts of Tween-60 of bonus point analysis, stirs 20min after 25min, is 3 with nitre acid for adjusting pH value；Quantitative coating step 3a) obtain
Honeycomb ceramic carrier, then at 95 DEG C of dry 4h, then the high temperature furnace in 450 DEG C roasts 5 hours to get finished catalyst.
Embodiment 2
A kind of preparation method of motor vehicle tail-gas purifying close coupling three-way catalyst, comprising the following steps:
1) preparation of composite A
By mass percentage, cerous nitrate 30%, zirconium nitrate 30%, lanthanum nitrate 5%, praseodymium nitrate 5% is weighed successively to dissolve
In pure water, γ-Al is added in stirring2O330%, add dry powder weight 2.5% hydrogen peroxide stir 40 minutes, then plus
Enter the citric acid of dry powder weight 8%, stir 40 minutes, adding ammonium hydroxide and adjusting pH value is 9,7 hours is aged, after filtering and washing
Composite material high temperature kiln roasting 4 hours of 650 DEG C to get composite A；
2) preparation of composite material B
By mass percentage, cerous nitrate 15%, zirconium nitrate 30%, lanthanum nitrate 5%, yttrium nitrate 5% is weighed successively to dissolve
In pure water, γ-Al is added in stirring2O345%, add dry powder weight 2.5% hydrogen peroxide stir 40 minutes, then plus
Enter the citric acid of dry powder weight 8%, stir 40 minutes, adding ammonium hydroxide and adjusting pH value is 9,7 hours is aged, after filtering and washing
Composite material high temperature kiln roasting 4 hours of 650 DEG C to get composite material B；
3) preparation of catalyst coat material
3a) weighing the obtained composite A of 888.89g step 1), boehmite 111.11g, pure water 2000g, concentration is
15% palladium nitrate 147.14g, ball milling 40min, Control granularity D50It=5 μm, moves in stirring container, adds pure water modulation slurry solid
Content 30% stirs dropwise addition in 30 minutes and analyzes pure Tween-60 56g, is stirred for 30 minutes, is 4.0 with nitre acid for adjusting pH value, fixed
Amount coating honeycomb ceramic carrier, 3 hours dry in 100 DEG C, 500 DEG C of furnaces of high temperature roast 4 hours to get coating composite materials A, expensive
The honeycomb ceramic carrier of Metal Palladium, the dry weight gain 120g/L of composite A, precious metal palladium content in honeycomb ceramic carrier obtained
75g/ft3；
3b) weighing the obtained composite material B of 888.89g step 2), boehmite 111.11g, pure water 2000g, concentration is
10% rhodium nitrate 22.07g, ball milling 40min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulation slurry contains admittedly
Amount 30%, bonus point analyses pure Tween-60 56g after stirring 30 minutes, is stirred for 30min, is 4.0 with nitre acid for adjusting pH value, quantitative to apply
Cover step 3a) made from honeycomb ceramic carrier, 3 hours dry then at 100 DEG C, 500 DEG C of furnaces of high temperature roast 4 hours to get catalysis
Agent finished product, the dry weight gain 80g/L, Noble Metal Rhodium content 5g/ft of composite material B in finished catalyst3。
Catalyst is made in embodiment 2 and is mounted on progress oil-break circulation aging 50 hours on engine pedestal.Catalyst is old
Change 950 DEG C of circulating temperature highest, vehicle catalyst installation site at the 150mm of engine exhaust port, according to
GB18352.5-2013 " light-duty vehicle pollutant emission limit and measurement method (Chinese 5th stage) " carry out room temperature it is cold under it is cold
Start final vacuum pollutant emission (I type) performance test.Specific testing result is as shown in table 1 below.
The performance of the obtained catalyst of 1 present invention of table
| Project | CO(g/km) | THC(g/km) | NO(g/km) |
| Standard limited value | 1.00 | 0.100 | 0.060 |
| Example test value | 0.496 | 0.049 | 0.037 |
For analytical table 1 it is found that after using catalyst treatment tail gas produced by the present invention, CO, THC, NO content in tail gas are bright
It is aobvious to be lower than standard limited value.
Embodiment 3
A kind of preparation method of motor vehicle tail-gas purifying close coupling three-way catalyst, comprising the following steps:
1) preparation of composite A
By mass percentage, cerous nitrate 40%, zirconium nitrate 30%, lanthanum nitrate 5%, praseodymium nitrate 5% are weighed, is successively dissolved
In pure water, γ-Al is added in stirring2O320%, the hydrogen peroxide of dry powder weight 3% is added, 50min is stirred, is then added
The citric acid of dry powder weight 10% stirs 50min, and adding ammonium hydroxide and adjusting pH value is 9, is aged 10 hours, after filtering and washing,
Solid is in 700 DEG C of high temperature kiln roasting 3h to get composite A；
2) preparation of composite material B
By mass percentage, cerous nitrate 20%, zirconium nitrate 30%, lanthanum nitrate 5%, yttrium nitrate 5% are weighed, is successively dissolved
In pure water, γ-Al is added in stirring2O340%, add 3% hydrogen peroxide of dry powder weight, stir 50min, then plus
Enter the citric acid of dry powder weight 10%, stir 50min, adding ammonium hydroxide and adjusting pH value is 9, is aged 10 hours, filtering and washing
Afterwards, solid is in 700 DEG C of high temperature kiln roasting 3h to get composite material B；
3) preparation of catalyst coat material
3a) by weight, weighing 900g composite A, boehmite 120g, pure water 2200g, concentration is 15%
Palladium nitrate 150g, ball milling 50min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content 35%,
Pure 60 parts of Tween-60 of analysis are added dropwise after stirring 35min, stirs 40min, is 5 with nitre acid for adjusting pH value；Then bee is quantitatively coated
Nest ceramic monolith, prior to 100 DEG C dry 2h roast 3 hours then at 550 DEG C of high temperature furnaces to get coating composite materials A, noble metal
The honeycomb ceramic carrier of palladium；
3b) weigh the composite material B, boehmite 120g, pure water 2200g, the rhodium nitrate that concentration is 10% of 900g
24g, ball milling 50min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content 35%, stirring
Pure 60 parts of Tween-60 of bonus point analysis, stirs 40min after 35min, is 5 with nitre acid for adjusting pH value；Quantitative coating step 3a) obtain
Honeycomb ceramic carrier, then at 100 DEG C of dry 2h, then the high temperature furnace in 550 DEG C roasts 3 hours to get finished catalyst.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of motor vehicle tail-gas purifying preparation method of close coupling three-way catalyst, which comprises the following steps:
1) preparation of composite A
Cerous nitrate, zirconium nitrate, lanthanum nitrate, praseodymium nitrate are weighed in proportion to be successively dissolved in pure water, and γ-Al is added in stirring2O3,
Hydrogen peroxide is added, stirs, citric acid is then added, ammonium hydroxide is added after stirring and adjusts pH value, filtering and washing after ageing, solid
It roasts up to composite A；
2) preparation of composite material B
Cerous nitrate, zirconium nitrate, lanthanum nitrate, yttrium nitrate are weighed in proportion to be successively dissolved in pure water, and γ-Al is added in stirring2O3,
Hydrogen peroxide is added, is stirred, citric acid is then added, stirs and adds appropriate ammonium hydroxide adjusting pH value, filtering and washing after ageing, Gu
Body roasts to obtain composite material B；
3) preparation of catalyst coat material
Composite A, boehmite, pure water, palladium nitrate, mixing and ball milling Control granularity D 3a) is made in appropriate step 1)50=5
μm, it moves in stirring container plus pure water modulates slurry solid content 25-35%, Tween-60 is added dropwise after stirring, uses nitric acid after being stirred for
PH value is adjusted, honeycomb ceramic carrier is then quantitatively coated, up to coating composite materials A, the ceramic honey comb of precious metal palladium after drying
Carrier；
Composite material B, boehmite, pure water, rhodium nitrate, mixing and ball milling, Control granularity D 3b) is made in step 2)50=5 μm,
It moves in stirring container plus pure water modulates slurry solid content 25-35%, Tween-60 is added after stirring, with appropriate nitric acid tune after stirring
Save pH value, quantitative coating step 3a) obtained honeycomb ceramic carrier, it is dry after coating composite materials B, Noble Metal Rhodium honeycomb
Ceramic monolith.
2. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 1 with close coupling three-way catalyst, feature
It is, the preparation of composite A in the step 1), specifically includes the following steps:
By mass percentage, cerous nitrate 20-40%, zirconium nitrate 20-40%, lanthanum nitrate 3-8%, praseodymium nitrate 3-8% are weighed, according to
It is secondary to be dissolved in pure water, γ-Al is added in stirring2O320-40%, wherein cerous nitrate, zirconium nitrate, lanthanum nitrate, praseodymium nitrate and
γ-Al2O3Total amount be 100%, add the hydrogen peroxide of dry powder weight 2-3%, stir 30-50min, dry powder weight is then added
The citric acid of 5-10% is measured, 30-50min is stirred, adding ammonium hydroxide and adjusting pH value is 8-9, is aged 5-10 hour, filtering and washing
Afterwards, solid is in 600-700 DEG C of high temperature kiln roasting 3-5h to get composite A.
3. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 1 with close coupling three-way catalyst, feature
It is, the preparation of step 2) the composite material B, specifically includes the following steps:
By mass percentage, cerous nitrate 10-20%, zirconium nitrate 20-40%, lanthanum nitrate 3-8%, yttrium nitrate 3-8% are weighed, according to
It is secondary to be dissolved in pure water, γ-Al is added in stirring2O340-50%, wherein cerous nitrate, zirconium nitrate, lanthanum nitrate, yttrium nitrate, γ-
Al2O3Total amount be 100%, add the hydrogen peroxide of the 2-3% of dry powder weight, stir 30-50min, dry powder weight is then added
The citric acid of 5-10% stirs 30-50min, and adding ammonium hydroxide and adjusting pH value is 8-9, is aged 5-10 hour, filtering and washing
Afterwards, solid is in 600-700 DEG C of high temperature kiln roasting 3-5h to get composite material B.
4. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 1 with close coupling three-way catalyst, feature
It is, the step 3a), specifically includes the following steps:
By weight, 850-900 parts of composite As, 100-120 parts of boehmite, 1800-2200 parts of pure water, nitre are weighed
Sour palladium 140-150 parts, ball milling 30-50min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content
25-35% is added dropwise Tween-60 50-60 parts after stirring 25-35min, stirs 20-40min, be 3-5 with nitre acid for adjusting pH value；So
Honeycomb ceramic carrier is quantitatively coated afterwards, prior to 95-100 DEG C dry 2-4h, then at high temperature furnace roasting 3-5 hours of 450-550 DEG C, i.e.,
Obtain the honeycomb ceramic carrier of coating composite materials A, precious metal palladium.
5. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 4 with close coupling three-way catalyst, feature
It is, the step 3b), specifically includes the following steps:
By weight, weigh 850-900 parts composite material B, 100-120 parts of boehmite, 1800-2200 parts of pure water,
20-24 parts of rhodium nitrate, ball milling 30-50min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content
25-35% adds Tween-60 50-60 parts after stirring 25-35min, stirs 20-40min, be 3-5 with nitre acid for adjusting pH value；It is quantitative
Coating step 3a) obtained honeycomb ceramic carrier, then at 95-100 DEG C of dry 2-4h, then the high temperature furnace in 450-550 DEG C is roasted
3-5 hours to get finished catalyst.
6. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 1 with close coupling three-way catalyst, feature
It is, the concentration of the palladium nitrate is 15%, and the concentration of rhodium nitrate is 10%.
7. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 1 with close coupling three-way catalyst, feature
It is, the Tween-60 is pure using analyzing.
8. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 1 with close coupling three-way catalyst, feature
It is, comprising the following steps:
1) preparation of composite A
By mass percentage, weigh cerous nitrate 30%, zirconium nitrate 30%, lanthanum nitrate 5%, praseodymium nitrate 5% be successively dissolved in it is pure
In water, γ-Al is added in stirring2O330%, the hydrogen peroxide for adding dry powder weight 2.5% stirs 40 minutes, is then added dry
The citric acid of powder weight 8% stirs 40 minutes, and adding ammonium hydroxide and adjusting pH value is 9, is aged 7 hours, answering after filtering and washing
Condensation material is high temperature kiln roasting 4 hours of 650 DEG C to get composite A；
2) preparation of composite material B
By mass percentage, weigh cerous nitrate 15%, zirconium nitrate 30%, lanthanum nitrate 5%, yttrium nitrate 5% be successively dissolved in it is pure
In water, γ-Al is added in stirring2O345%, the hydrogen peroxide for adding dry powder weight 2.5% stirs 40 minutes, is then added dry
The citric acid of powder weight 8% stirs 40 minutes, and adding ammonium hydroxide and adjusting pH value is 9, is aged 7 hours, answering after filtering and washing
Condensation material is high temperature kiln roasting 4 hours of 650 DEG C to get composite material B；
3) preparation of catalyst coat material
It 3a) weighs 888.89g step 1) and composite A, boehmite 111.11g, pure water 2000g, palladium nitrate is made
147.14g, ball milling 40min, Control granularity D50It=5 μm, moves in stirring container, adds pure water to modulate slurry solid content 30%, stir
30 minutes dropwise addition Tween-60 56g are mixed, are stirred for 30 minutes, are 4.0 with nitre acid for adjusting pH value, ceramic honey comb is quantitatively coated and carries
Body, 3 hours dry in 100 DEG C, 500 DEG C of furnaces of high temperature roast 4 hours to get coating composite materials A, the ceramic honey comb of precious metal palladium
Carrier；
It 3b) weighs 888.89g step 2) and composite material B, boehmite 111.11g, pure water 2000g, rhodium nitrate is made
22.07g, ball milling 40min, Control granularity D50It=5 μm, moves in stirring container plus pure water modulates slurry solid content 30%, stirring
After 30 minutes plus Tween-60 56g, be stirred for 30min, be 4.0 with nitre acid for adjusting pH value, quantitative coating step 3a) made from bee
3 hours dry then at 100 DEG C on nest ceramic monolith, 500 DEG C of furnaces of high temperature roast 4 hours to get finished catalyst.
9. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 8 with close coupling three-way catalyst, feature
Be, the step 3a) made from the dry weight gain 120g/L, precious metal palladium content 75g/ of composite A in honeycomb ceramic carrier
ft3。
10. a kind of preparation method of the motor vehicle tail-gas purifying according to claim 8 with close coupling three-way catalyst, feature
Be, the step 3b) finished catalyst in the dry weight gain 80g/L, Noble Metal Rhodium content 5g/ft3 of composite material B.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110404536A (en) * | 2019-08-08 | 2019-11-05 | 无锡威孚环保催化剂有限公司 | The preparation method of the three-way catalyst of bilayer coating |
| CN112080162A (en) * | 2019-06-14 | 2020-12-15 | 南京树丰汽车用品有限公司 | Engine repairing agent prepared from precious metal and cerium nitrate and using method thereof |
| CN114849697A (en) * | 2022-05-23 | 2022-08-05 | 东风汽车集团股份有限公司 | Catalyst based on three-way catalyst ceramic carrier and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101479023A (en) * | 2006-06-29 | 2009-07-08 | 乌米科雷股份两合公司 | Three-way catalyst |
| CN102131582A (en) * | 2008-12-03 | 2011-07-20 | 第一稀元素化学工业株式会社 | Exhaust gas purification catalyst, exhaust gas purification device using same, and exhaust gas purification method |
| CN102728383A (en) * | 2012-02-22 | 2012-10-17 | 华东理工大学 | Preparation method of high temperature stable monolithic catalyst for purifying tail gas of automobile |
| CN102824904A (en) * | 2012-09-20 | 2012-12-19 | 上海华明高纳稀土新材料有限公司 | Composite aluminium, cerium and zirconium oxide catalytic material and method for producing same |
| CN103877975A (en) * | 2014-03-28 | 2014-06-25 | 重庆同庆环保技术有限公司 | Internal combustion engine tail gas purifying ternary catalyst and preparation method thereof |
| US20170320048A1 (en) * | 2014-03-21 | 2017-11-09 | Basf Corporation | Integrated lnt-twc catalyst |
| CN108273501A (en) * | 2018-02-09 | 2018-07-13 | 重庆辉虎催化剂有限公司 | A kind of vehicle maintenance service three-way catalyst and preparation method thereof |
-
2018
- 2018-10-08 CN CN201811166126.0A patent/CN109225213A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101479023A (en) * | 2006-06-29 | 2009-07-08 | 乌米科雷股份两合公司 | Three-way catalyst |
| CN102131582A (en) * | 2008-12-03 | 2011-07-20 | 第一稀元素化学工业株式会社 | Exhaust gas purification catalyst, exhaust gas purification device using same, and exhaust gas purification method |
| CN102728383A (en) * | 2012-02-22 | 2012-10-17 | 华东理工大学 | Preparation method of high temperature stable monolithic catalyst for purifying tail gas of automobile |
| CN102824904A (en) * | 2012-09-20 | 2012-12-19 | 上海华明高纳稀土新材料有限公司 | Composite aluminium, cerium and zirconium oxide catalytic material and method for producing same |
| US20170320048A1 (en) * | 2014-03-21 | 2017-11-09 | Basf Corporation | Integrated lnt-twc catalyst |
| CN103877975A (en) * | 2014-03-28 | 2014-06-25 | 重庆同庆环保技术有限公司 | Internal combustion engine tail gas purifying ternary catalyst and preparation method thereof |
| CN108273501A (en) * | 2018-02-09 | 2018-07-13 | 重庆辉虎催化剂有限公司 | A kind of vehicle maintenance service three-way catalyst and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112080162A (en) * | 2019-06-14 | 2020-12-15 | 南京树丰汽车用品有限公司 | Engine repairing agent prepared from precious metal and cerium nitrate and using method thereof |
| CN110404536A (en) * | 2019-08-08 | 2019-11-05 | 无锡威孚环保催化剂有限公司 | The preparation method of the three-way catalyst of bilayer coating |
| CN114849697A (en) * | 2022-05-23 | 2022-08-05 | 东风汽车集团股份有限公司 | Catalyst based on three-way catalyst ceramic carrier and preparation method thereof |
| CN114849697B (en) * | 2022-05-23 | 2023-10-27 | 东风汽车集团股份有限公司 | Catalyst based on three-way catalyst ceramic carrier and preparation method thereof |
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