CN103806987A - Diesel particulate filter provided with three-way catalytic coatings - Google Patents
Diesel particulate filter provided with three-way catalytic coatings Download PDFInfo
- Publication number
- CN103806987A CN103806987A CN201210595815.XA CN201210595815A CN103806987A CN 103806987 A CN103806987 A CN 103806987A CN 201210595815 A CN201210595815 A CN 201210595815A CN 103806987 A CN103806987 A CN 103806987A
- Authority
- CN
- China
- Prior art keywords
- waste gas
- diesel
- particulate filter
- filter
- element catalytic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 38
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 34
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 14
- 230000003647 oxidation Effects 0.000 claims abstract description 13
- 239000004071 soot Substances 0.000 claims abstract description 13
- 230000008929 regeneration Effects 0.000 claims abstract description 6
- 238000011069 regeneration method Methods 0.000 claims abstract description 6
- 239000002912 waste gas Substances 0.000 claims description 48
- 239000011248 coating agent Substances 0.000 claims description 33
- 239000000446 fuel Substances 0.000 claims description 28
- 238000012958 reprocessing Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 4
- 239000002283 diesel fuel Substances 0.000 claims 2
- 239000000126 substance Substances 0.000 claims 1
- 230000009469 supplementation Effects 0.000 abstract 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 101100444396 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ECM30 gene Proteins 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a diesel particulate filter provided with three-way catalytic coatings, and relates to a diesel particulate filter used for a diesel exhaust system. The diesel particulate filter comprises a plurality of filter flow channels which are used for removing diesel exhaust particulates from diesel exhaust flow, wherein the plurality of filter flow channels are contacted with the diesel exhaust flow and coated with the three-way catalytic coatings; and the three-way catalytic coatings can be configured to promote soot oxidation during occurrence of a regeneration event, and promotes reduction of NOx in the exhaust flow simultaneously. The three-way catalytic coatings can be used as replacement or supplementation of a three-way catalyst of a diesel oxidation catalyst.
Description
Background technique
Diesel engine emissions more and more receives publicity on the impact of environment at present with them.These engine application are to generator, vehicular engine or in similarly installing.Be accompanied by this concern, occur that increasing government regulation carrys out limiting emission to the various tail gas in environment, wherein unwanted a kind of tail gas is exactly NO
x.
The NO discharging from diesel engine
xamount depend on the air fuel ratio for moving motor, also have some other factor, such as combustion temperature, enter into the amount of oxygen of cylinder etc.The motor only moving under steady state is that the typical fuel-sean mixture with high air-fuel ratio of using moves.Required torque, fuel economy and controlled NO
xdischarge can realize by burning optimization.For example, but under instantaneous state, vehicle accelerates to reach required torque with faster response, NOx content has become challenge.Under this transient state, because the more energy of needs meets the demand of moment of torsion, reduce consciously EGR (EGR) rate these high-temp combustion waste gas can be transferred in turbosupercharger.But the reduction of EGR has caused NO
xdischarge amount increase.If can obtain under these conditions desirable waste gas component concentration, the so this after-treatment system with suitable PGM formula and coating can be used for reducing described NO
x.
Summary of the invention
Equipment described herein relates to the diesel particulate filter for diesel engine exhaust system.Described diesel particulate filter comprises the particulate filter with multiple filter flow channels, and it is configured to remove diesel exhaust particle from diesel exhaust stream.Described multiple filter flow channel is arranged to contact with described diesel exhaust stream, scribbles three-element catalytic coating simultaneously.
Another kind of equipment described herein relates to the waste gas system for diesel engine.Described waste gas system comprises flow path, and it is configured to from diesel engine main body guiding waste gas streams, and wherein said waste gas comprises NO
xwith hydrocarbon and other waste gas components.Diesel oxidation catalyst receives the waste gas streams from described flow path, and reduces the content of useless hydrocarbon in gas.Diesel particulate filter receives the waste gas streams from diesel oxidation catalyst.Described diesel particulate filter comprises to have and is configured to contact to reduce the NO in waste gas with the waste gas streams that flows through diesel particulate filter
xthe particulate filter of the three-element catalytic coating of content.
Another kind of equipment herein relates to diesel engine system.This diesel engine system comprises the diesel engine main body with one or more spark plugs that are connected with one or more cylinders respectively.Air/fuel mixer is configured to control the air fuel ratio of the fuel of lighting by the one or more spark plugs in different one or more cylinders.This air/fuel mixer is also further configured to improve the instantaneous state of air fuel ratio with response diesel engine system.This diesel engine system also comprises reprocessing waste gas system, and it is configured to receive the waste gas being produced by one or more cylinders.This after-treatment system comprises the particulate filter with three-element catalytic coating, and wherein said coating is configured to contact by the waste gas of particulate filter.
Accompanying drawing explanation
Fig. 1 has shown the diesel engine system with reprocessing waste gas system, and it comprises the particulate filter with three-element catalytic coating, and wherein said coating is configured to contact by the waste gas of particulate filter;
Fig. 2 is the schematic cross-section along the longitudinal axis with the exemplary particulate filter of three-element catalytic coating.
Embodiment
Fig. 1 shows the diesel engine system 10 with reprocessing waste gas system 15 and diesel engine main body 20.Described diesel engine main body 20 is configured to combustion fuel with drive system 10.For this reason, described diesel engine main body 20 comprises the air/fuel system 25 of being controlled by controller/ECM30.Described ECM30 is controlling the air fuel ratio of burning in cylinder 40.In 20 steady states whens operation of diesel engine main body, this air fuel ratio may be stoichiometric air-fuel ratio or than its less air fuel ratio.But in instantaneous operation, this air fuel ratio is controlled such that it provides more mixture to increase energy that diesel engine main body 20 produces with response instantaneous state to spark plug 35.
Described cylinder 40 is by for example conduit, such as pipeline 45 provides diesel exhaust to reprocessing waste gas system 15.This diesel exhaust stream has a lot of pollutants, comprises NO
x.In other equipment, this reprocessing waste gas system 15 may comprise the batcher 50 that receives diesel exhaust stream and the burner 55 that is placed on these batcher 50 upstreams.In the time being activated by ECM30, this batcher 50 is configured to fuel to be injected in waste gas streams.Can in diesel oxidation catalyst (DOC) 60, there is chemical reaction and improve and will enter into the exhaust gas temperature of diesel particulate filter 65 in these fuel.For example, under some driving conditions and/or when accumulating in the soot of DPF65 and be oxidized, fuel can be injected enters in waste gas streams, and regeneration event occurs.But, according to some mode of execution, as additional or substitute, fuel also can by or in burner 55 dosing enter in waste gas streams.This is commonly used to improve the exhaust gas temperature of DOC60 ingress, thereby makes the fuel that fuel injects from batcher 50 carry out chemical reaction at DOC60.
DOC60 is configured to chemically transform the pollutant in waste gas streams.For example, DOC60 can comprise as the palladium of catalyzer and with platinum, hydrocarbon become to carbon dioxide and water with Oxidation of Carbon Monoxide, and reaction equation is as lower:
CO+
1/
2o
2→ CO
2and
[HC]+O
2→CO
2+H
2O。
Described waste gas streams can flow to described DPF65 from described DOC60.Described DPF65 can comprise the particulate filter substrate 75 that can build with different modes.For example, according to some mode of execution, described particulate filter substrate 75 can be to have wall-flow filter or wall-flow type monoblock structure, as shown in exemplary cross section schematic diagram in Fig. 2.The wall-flow type structure of this particulate filter substrate 65 can be ceramic structure cylindraceous, and it has some less parallel channels 80 along axial operation.Described ceramic structure typically has the porosity ratio of accurate control.In wall-flow filter 75, each end of adjacent passage 80 is selectively blocked 85, forces thus exhaust-gas flow to pass porous wall, and this porous wall plays filtering medium effect and from waste gas streams, removes particulate matter, for example soot.Flow arrow as shown in Figure 2 shown from waste gas streams flow through the waste gas streams of described particulate filter substrate 75 to.
Three-element catalytic coating 90 is arranged on the surface of described particulate filter substrate 75, contacts with diesel exhaust stream.In Fig. 2, (if not all) most surface of passage 80 is applying described three-element catalytic coating 90.But according to some mode of execution, described three-element catalytic coating 90 may only be arranged on the limited surface of described passage 80.For example, described coating 90 may be arranged in close entrance point and/or the outlet end 76,78 of described particulate filter 75 restrictedly.In other structures, may only apply some passage 80.Further, described coating 90 may be limited in the middle-end 82 of described particulate filter 75.Other configurations that described particulate filter 75 is applied in addition that can expect.
The composition of three-element catalytic coating 90 makes it from diesel exhaust stream, to remove NO
x.For this reason, described three-element catalytic coating 90 can comprise the rare metal of different amounts, for example, and platinum, palladium and rhodium and oxygen storage catalyst.Also can select these rare metals to be used for promoting the oxidation of soot in the regeneration event process of DPF65.For example, according to some mode of execution, three-element catalytic coating 90 can comprise in the precious metal formula that is used for regenerating adds rhodium, and the formula being provided to make can make soot oxidation contribute to NO simultaneously
xreduction.
Except can effectively removing a large amount of NO
xoutside, build up the temperature of soot than effectively removing from the uncoated wall-flow filter with analog structure, in the time of filter regeneration described in three-element catalytic coating 90 can also reduce from described wall-flow filter 75 and effectively remove the temperature of building up soot.More specifically, compared with exposed DPF, the three-element catalytic coating 90 on described DPF65 can reduce the activation energy of soot oxidation reaction, realizes higher soot oxidation speed, thereby has promoted cleaning of DPF65.In addition, because DPF is conventionally larger than DOC, in reprocessing waste gas system, than the obtainable capacity of three-way catalyst typical case, described in there is the DPF65 of three-element catalytic coating 90 75 of particulate filter substrates sizable capacity is provided.At described reprocessing waste gas system 15, especially in described particulate filter substrate 75, the three-way catalyst capacity so increasing, may increase the waiting time that described waste gas contacts with three-way catalyst, and increased the area of contact of three-element catalytic coating 90, therefore further promote to maximize described NO
xreduce speed and the amount of reaction.Although the DPF65 applying can, in the fuel-sean of described diesel engine main body 20, remove NO under quiet rum state
xbut it is more effective under the instantaneous operating mode with fuel mixture more fully.According to some mode of execution, the category that comprises of the ternary coating 90 in DPF65 is supplementing or substituting of three-element catalytic coating in DOC60.Therefore, in certain embodiments, described DOC60 comprises three-way catalyst coating, and the upper extra ternary coating 90 of DPF65 can further promote NO
xthe reduction of level.
The various embodiments of described mode and device have shown and have described out, it is worth noting, the principle that each disclosed embodiment embodies can be expanded to extend and still fall in the scope of following claim simultaneously.
Claims (15)
1. for a diesel particulate filter for diesel engine exhaust system, it comprises:
Particulate filter, it has the multiple filter flow channels that are configured to remove diesel exhaust particle from diesel exhaust stream;
Three-element catalytic coating, it is arranged on the surface of described multiple filter flow channels, for contacting with described diesel exhaust stream.
2. diesel particulate filter as claimed in claim 1, is characterized in that, described particulate filter is wall-flow filter.
3. diesel particulate filter as claimed in claim 1, is characterized in that, described three-element catalytic coated fabric is placed on the surface of multiple filter flow channels of contiguous described particulate filter entrance.
4. diesel particulate filter as claimed in claim 1, is characterized in that, described three-element catalytic coated fabric is placed on the surface of multiple filter flow channels of adjacent wall streaming filter outlet.
5. diesel particulate filter as claimed in claim 1, it is characterized in that, build up the temperature of soot than effectively removing from the uncoated wall-flow filter with same structure, in the time of filter regeneration described in three-element catalytic coating reduced from described wall-flow filter and effectively removed the temperature of building up soot.
6. diesel particulate filter as claimed in claim 1, is characterized in that, described three-element catalytic coating has Chemical composition that, itself and NO
xreaction is to be reduced in the described NO in described diesel exhaust stream
xamount.
7. a diesel engine exhaust system, it comprises:
Flow path, it is configured to be connected with the waste gas streams flowing out from diesel engine main body, and wherein said waste gas comprises NO
xand hydrocarbon;
Diesel oxidation catalyst, it is configured to receive the waste gas streams flowing out from described flow path, and reduces the amount of useless hydrocarbon in gas;
Diesel particulate filter, it is configured to receive the waste gas streams flowing out from described diesel oxidation catalyst, wherein said diesel particulate filter comprises and has the particulate filter that is configured to the three-element catalytic coating contacting with the waste gas streams that flows through diesel particulate filter, to reduce NO in waste gas
xamount.
8. waste gas system as claimed in claim 7, is characterized in that, described particulate filter is wall-flow filter.
9. waste gas system as claimed in claim 7, is characterized in that, described three-element catalytic coated fabric is placed in the substrate of contiguous described wall-flow filter entrance.
10. waste gas system as claimed in claim 7, is characterized in that, described three-element catalytic coated fabric is placed in the substrate of contiguous described wall-flow filter outlet.
11. waste gas systems as claimed in claim 7, it is characterized in that, build up the temperature of soot than effectively removing from the uncoated wall-flow filter with same structure, in the time of filter regeneration described in three-element catalytic coating be configured to reduce from described wall-flow filter and effectively remove the temperature of building up soot.
12. waste gas systems as claimed in claim 11, is characterized in that, described diesel oil oxidation catalyst converter is arranged between fuel batcher and diesel particulate filter.
13. waste gas systems as claimed in claim 7, is characterized in that, described diesel oil oxidation catalyst converter comprises three-element catalytic coating.
14. 1 kinds of diesel engine systems, it comprises:
Diesel engine main body, it comprises respectively the one or more spark plugs that are combined with one or more cylinders;
Air fuel mixer, it is configured to control respectively the air fuel ratio by described one or more spark plug institute fire fuel in described one or more cylinders, and wherein said air/fuel mixture is configured to improve the instantaneous operating mode of described air fuel ratio with response diesel engine system further;
Reprocessing waste gas system, it is configured to be received in the waste gas producing in one or more cylinders, wherein said reprocessing waste gas system comprises the particulate filter being applied by three-way catalyst, and wherein said three-element catalytic coating is configured to and contacts to reduce the NO in waste gas streams by the waste gas streams of described particulate filter
x.
15. waste gas systems as claimed in claim 14, is characterized in that, described DOC has three-element catalytic coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210595815.XA CN103806987A (en) | 2012-11-12 | 2012-11-12 | Diesel particulate filter provided with three-way catalytic coatings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210595815.XA CN103806987A (en) | 2012-11-12 | 2012-11-12 | Diesel particulate filter provided with three-way catalytic coatings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103806987A true CN103806987A (en) | 2014-05-21 |
Family
ID=50704307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210595815.XA Pending CN103806987A (en) | 2012-11-12 | 2012-11-12 | Diesel particulate filter provided with three-way catalytic coatings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103806987A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105056946A (en) * | 2015-08-10 | 2015-11-18 | 无锡威孚环保催化剂有限公司 | Quaternary catalyst for in-cylinder direct injection engine and preparation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005022420A1 (en) * | 2005-05-14 | 2006-06-14 | Daimlerchrysler Ag | Exhaust gas recycling plant for burning device in motor vehicle, comprises a selective catalytic reduction catalyst in track, reduction device, control unit operates the burning device, oxidation catalyst, and a particle filter |
| CN1845780A (en) * | 2003-08-29 | 2006-10-11 | 陶氏环球技术公司 | Improved Diesel Exhaust Filter |
| CN1863586A (en) * | 2003-08-05 | 2006-11-15 | 乌米科雷股份两合公司 | Catalyst arrangement and method of purifying the exhaust gas of internal combustion engines operated under lean conditions |
| CN101313132A (en) * | 2005-11-21 | 2008-11-26 | 五十铃自动车株式会社 | Regeneration control method for exhaust gas purification system and exhaust gas purification system |
| CN101970817A (en) * | 2008-02-05 | 2011-02-09 | 巴斯夫公司 | Gasoline engine emissions treatment systems having particulate traps |
| DE102011100677A1 (en) * | 2011-05-06 | 2012-11-08 | Daimler Ag | Operating method for a motor vehicle diesel engine |
-
2012
- 2012-11-12 CN CN201210595815.XA patent/CN103806987A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1863586A (en) * | 2003-08-05 | 2006-11-15 | 乌米科雷股份两合公司 | Catalyst arrangement and method of purifying the exhaust gas of internal combustion engines operated under lean conditions |
| CN1845780A (en) * | 2003-08-29 | 2006-10-11 | 陶氏环球技术公司 | Improved Diesel Exhaust Filter |
| DE102005022420A1 (en) * | 2005-05-14 | 2006-06-14 | Daimlerchrysler Ag | Exhaust gas recycling plant for burning device in motor vehicle, comprises a selective catalytic reduction catalyst in track, reduction device, control unit operates the burning device, oxidation catalyst, and a particle filter |
| CN101313132A (en) * | 2005-11-21 | 2008-11-26 | 五十铃自动车株式会社 | Regeneration control method for exhaust gas purification system and exhaust gas purification system |
| CN101970817A (en) * | 2008-02-05 | 2011-02-09 | 巴斯夫公司 | Gasoline engine emissions treatment systems having particulate traps |
| DE102011100677A1 (en) * | 2011-05-06 | 2012-11-08 | Daimler Ag | Operating method for a motor vehicle diesel engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105056946A (en) * | 2015-08-10 | 2015-11-18 | 无锡威孚环保催化剂有限公司 | Quaternary catalyst for in-cylinder direct injection engine and preparation method therefor |
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Application publication date: 20140521 |