CN103806987A - Diesel particulate filter provided with three-way catalytic coatings - Google Patents

Diesel particulate filter provided with three-way catalytic coatings Download PDF

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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
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China
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filter
diesel
particulate filter
exhaust
flow
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CN201210595815.XA
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Chinese (zh)
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L·C·卡塔尼
M·乌哈斯基
R·罗迪古兹
J·希格勒
M·塞伯利希
J·施普
J·陈
D·卡迪卡尔
N·辛格
J·席尔瓦
S·曼达拉普
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万国引擎知识产权有限责任公司
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Priority to CN201210595815.XA priority Critical patent/CN103806987A/en
Publication of CN103806987A publication Critical patent/CN103806987A/en

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/20Exhaust after-treatment
    • Y02T10/22Three way catalyst technology, i.e. oxidation or reduction at stoichiometric equivalence ratio

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

具有三元催化涂层的柴油颗粒过滤器 Diesel particulate filter having a catalytic coating

背景技术 Background technique

[0001] 柴油发动机排放物和它们对环境的影响目前越来越受到关注。 [0001] diesel engine emissions and their impact on the environment is currently more and more attention. 这些发动机应用到发电机、车用发动机或类似的装置中。 The generator applied to the engine, vehicle engine or the like apparatus. 伴随着这种关注,出现越来越多的政府法规来限制排放到环境中的各种尾气,其中不需要的一种尾气就是N0X。 Along with this concern, the emergence of a growing number of government regulations to limit the variety of exhaust emissions to the environment, which does not need a tail gas is N0X.

[0002] 从柴油发动机中排放的NOx的量取决于用来运行发动机的空燃比,还有一些其他的因素,例如燃烧温度、进入到汽缸中的氧气量等。 [0002] The amount of NOx emissions from a diesel engine depending on the air-fuel ratio, there are other factors to the operation of the engine, such as combustion temperature, the amount of oxygen into the cylinder, and the like. 仅在稳定状态下运行的发动机是典型的用具有高空燃比的贫燃混合物来运行的。 Only the engine operating at steady state is typically a lean mixture having a high air-fuel ratio to run. 所需的转矩、燃料经济性和可控的NOx排放可通过燃烧优化来实现。 Desired torque, fuel economy and control NOx emissions may be achieved by optimizing combustion. 然而,在瞬时状态下,例如车辆加速以更快响应来达到所需扭矩,则NOx含量变得有挑战性。 However, in a transient state, for example, the vehicle is accelerated at a faster response to achieve the desired torque, the NOx content becomes challenging. 在这种瞬态下,由于需要更多的能量来满足扭矩的需求,有意识地降低废气再循环(EGR)率将这些高温燃烧废气能转移到涡轮增压器中。 In this transient, since more energy is needed to meet the demand torque, conscious reducing exhaust gas recirculation (EGR) rate of these high-temperature combustion can be transferred to the exhaust gas turbocharger. 但是EGR的降低导致了NOx的排放量增加。 But the reduced EGR resulted in increased emissions of NOx. 假如在这些条件下可得到理想的废气组分浓度,那么这种带有合适的PGM配方和涂层的后处理系统可以用来降低所述N0X。 If the concentration of exhaust gas components is obtained under these conditions it is desirable, then this aftertreatment system with the appropriate PGM coating formulations and may be used to reduce the N0X.

发明内容 SUMMARY

[0003] 本文所描述的设备涉及到用于柴油机废气系统中的柴油颗粒过滤器。 [0003] The apparatus described herein relates to a diesel particulate filter for diesel exhaust system. 所述柴油颗粒过滤器包含具有多个过滤器流动通道的颗粒过滤器,其配置成从柴油废气流中去除柴油机废气颗粒。 The diesel particulate filter comprising a particulate filter having a plurality of flow channels of the filter, configured to remove particulates from diesel exhaust of diesel exhaust stream. 所述多个过滤器流动通道设置成与所述柴油机废气流接触,同时涂有三元催化涂层。 The plurality of filters disposed in contact with the flow passage of the diesel exhaust stream, and coated with a catalytic coating.

[0004] 本文所描述的另一种设备涉及到用于柴油机的废气系统。 [0004] Another apparatus described herein relate to an exhaust system for a diesel engine. 所述废气系统包含流动路径,其配置为从柴油机主体引导废气流,其中所述废气包含NOx和碳氢化合物以及其他废气组分。 The exhaust system comprises a flow path configured to guide exhaust gas flowing from a diesel engine main body, wherein the exhaust gas contains NOx and hydrocarbons and other exhaust gas components. 柴油机氧化催化器接收来自所述流动路径的废气流,并降低废气中碳氢化合物的含量。 Diesel oxidation catalyst receives the exhaust gas stream from the flow path, and to reduce the content of hydrocarbons in the exhaust gas. 柴油机颗粒过滤器接收来自柴油机氧化催化器的废气流。 Diesel particulate filter receives the exhaust stream from a diesel oxidation catalyst. 所述柴油机颗粒过滤器包含具有配置为与流动通过柴油颗粒过滤器的废气流接触以降低废气中的NOx含量的三元催化涂层的颗粒过滤器。 The diesel particulate filter comprising a particulate filter configured to have a catalytic coating in contact with the exhaust gas stream flowing through the diesel particulate filter to reduce the NOx content of the exhaust gas.

[0005] 本文的另一种设备涉及柴油机系统。 [0005] Another apparatus herein relates to diesel engine system. 这种柴油机系统包含具有一个或多个分别与一个或多个汽缸相连接的火花塞的柴油机主体。 This diesel engine system comprising a diesel engine or a body having a plurality of spark plugs each with one or more cylinders connected to. 空气/燃料混合器被配置用来控制通过不同的一个或多个汽缸中的一个或多个火花塞所点燃的燃料的空燃比。 Air / fuel mixer is configured to control the air-fuel ratio by a different one or more cylinders of one or more of the spark plug ignites the fuel. 这种空气/燃料混合器还进一步被配置来提高空燃比以响应柴油机系统的瞬时状态。 This air / fuel mixer is further configured to increase the air-fuel ratio in response to an instantaneous state of the diesel engine system. 该柴油机系统还包含后处理废气系统,其被配置来接收由一个或多个汽缸产生的废气。 After the diesel engine exhaust system further includes a processing system configured to receive the exhaust gases generated by one or more cylinders. 这种后处理系统包含具有三元催化涂层的颗粒过滤器,其中所述涂层被配置成接触通过颗粒过滤器的废气。 This aftertreatment system comprising a particulate filter having a catalytic coating, wherein the coating is configured to contact the exhaust gas by the particulate filter.

附图说明 BRIEF DESCRIPTION

[0006] 图1显示了具有后处理废气系统的柴油机系统,其包含具有三元催化涂层的颗粒过滤器,其中所述涂层被配置成接触通过颗粒过滤器的废气; [0006] Figure 1 shows a diesel engine system having post-processing exhaust system comprising a particulate filter having a catalytic coating, wherein the coating is configured to contact the exhaust gas by the particulate filter;

[0007] 图2是具有三元催化涂层的示例性颗粒过滤器的沿纵轴的截面示意图。 [0007] FIG. 2 is a schematic sectional view along the longitudinal axis of an exemplary particle filter having a catalytic coating. 具体实施方式 Detailed ways

[0008] 图1显示具有后处理废气系统15和柴油机主体20的柴油机系统10。 [0008] Figure 1 shows a diesel engine 15 and the system 10 of the diesel engine body 20 having an exhaust gas treatment system. 所述柴油机主体20被配置用来燃烧燃料以驱动系统10。 The diesel engine body 20 is configured to combust a fuel to drive the system 10. 为此,所述柴油机主体20包含由控制器/ECM30控制的空气/燃料系统25。 For this purpose, the diesel engine body 20 includes an air / fuel system controlled by the controller / ECM30 25. 所述ECM30控制着汽缸40中燃烧的空燃比。 ECM30 controls the combustion air-fuel ratio in the cylinder 40. 在柴油机主体20稳定状态运行时,该空燃比可能是化学计量空燃比或比其更小的空燃比。 In steady state operation the diesel engine body 20 when the air-fuel ratio may be stoichiometric or less than the air-fuel ratio. 然而,在瞬时操作中,该空燃比被控制使得其向火花塞35提供更多的混合物来增加柴油机主体20产生的能量以响应瞬时状态。 However, in the transient operation, the air-fuel ratio is controlled such that the mixture provides more energy to the spark plug 35 to a diesel engine body 20 increases in response to the generated transient state.

[0009] 所述汽缸40通过例如导管,比如管道45向后处理废气系统15提供柴油机废气。 [0009] For example the cylinder 40 through the conduit, such as conduit 45 to provide post-processing the exhaust system 15 diesel engine exhaust. 该柴油机废气流具有很多污染物,包括N0X。 The diesel engine exhaust stream has a number of contaminants, including N0X. 在其他设备中,该后处理废气系统15可能包含接收柴油机废气流的投配器50和放置在该投配器50上游的燃烧器55。 In other devices, the exhaust aftertreatment system 15 may include receiving doser diesel exhaust stream 50 and 50 disposed upstream of the combustor 55 dispensers. 当被ECM30激活时,该投配器50配置成将燃料注入到废气流中。 ECM30 When activated, the doser 50 is configured to inject fuel into the exhaust gas stream. 这些燃料可在柴油机氧化催化器(DOC) 60中发生化学反应来提高将进入到柴油颗粒过滤器65的废气温度。 These fuels can be used to increase the temperature of the exhaust gas entering the diesel particulate filter 65 is a chemical reaction diesel oxidation catalyst (DOC) 60 in. 例如,在某些行驶条件下和/或对聚积在DPF65的烟炱进行氧化时,燃料会被喷射进废气流中,即发生再生事件。 For example, under certain driving conditions and / or when the DPF65 accumulated soot is oxidized, the fuel is injected into the exhaust gas flow, i.e. the regeneration event. 然而,依据某些实施方式,作为附加或替代,燃料还可通过或者在燃烧器55中投配进入废气流中。 However, according to certain embodiments, additionally or alternatively, also through the fuel in the combustor 55 or dosing into the exhaust stream. 这通常用来提高D0C60入口处的废气温度,从而使得燃料从投配器50注入的燃料在D0C60进行化学反应。 This is often used to increase the exhaust gas temperature at the inlet D0C60, so that the chemical reaction of the fuel from the doser 50 D0C60 injected fuel.

[0010] D0C60配置成化学地转化废气流中的污染物。 [0010] D0C60 configured to chemically transformed contaminants in the exhaust stream. 例如,D0C60可包含作为催化剂的钯和钼将碳氢化合物和一氧化碳氧化成二氧化碳和水,反应式如下中: For example, D0C60 may comprise palladium and molybdenum oxide catalyst to carbon dioxide and water, hydrocarbons and carbon monoxide, the reaction is as follows:

co+72o2 — Co2 以及[HC] +O2 — C02+H20。 co + 72o2 - Co2 and [HC] + O2 - C02 + H20.

[0011] 所述废气流可从所述D0C60流到所述DPF65中。 [0011] The exhaust stream may flow from the D0C60 in the DPF65. 所述DPF65可包含能用不同方式构建的颗粒过滤器基底75。 The DPF65 may comprise a particulate filter can be constructed of a substrate 75 in different ways. 例如,根据某些实施方式,所述颗粒过滤器基底75可以是具有壁流式过滤器或者壁流式整块构造,如图2中示例性横截面示意图所示。 For example, according to certain embodiments, the particulate filter 75 may be a substrate having a wall flow filter, or a wall-flow monolith structure, as shown in FIG. 2 a schematic view of an exemplary cross-section. 该颗粒过滤器基底65的壁流式构造可以是圆筒状的陶瓷结构,其具有一些沿着轴向运行的较小的平行通道80。 The particulate filter is a wall flow structure substrate 65 may be a ceramic cylindrical structure having a smaller number of parallel channels 80 running in the axial direction. 所述陶瓷结构典型地具有精确控制的孔隙率。 The ceramic structure typically having a porosity of precisely controlled. 壁流式过滤器75中相邻的通道80的每个端部可选择地被堵塞85,由此迫使废气流动穿过多孔壁,该多孔壁起到过滤媒介作用从废气流中去除颗粒物质,例如烟炱。 Each end wall flow filter 75 adjacent channel 80 may optionally be blocked 85, thereby forcing the exhaust gas to flow through the porous wall, the porous wall play the role of the filter medium to remove particulate matter from the exhaust stream, e.g. soot. 如图2所示的流动箭头显示了从废气流中流动穿过所述颗粒过滤器基底75的废气流向。 Flow arrows shown in Figure 2 shows the exhaust stream flows through the particulate filter substrate 75 of the exhaust gas flow.

[0012] 三元催化涂层90布置在所述颗粒过滤器基底75的表面上,与柴油机废气流相接触。 [0012] The catalytic coating 90 disposed on a surface of the particulate filter substrate 75, in contact with the diesel exhaust stream. 在图2中,通道80的(如果不是全部的话)大部分的表面涂覆着所述三元催化涂层90。 In Figure 2, channel 80 (if not all) of the majority of the surface is coated with the catalytic coating 90. 然而,根据某些实施方式,所述三元催化涂层90可能仅布置于所述通道80的有限表面上。 However, according to certain embodiments, the catalytic coating 90 may be disposed only on a limited surface of the channel 80. 例如,所述涂层90可能受限制地布置于所述颗粒过滤器75的靠近进口端和/或出口端76、78。 For example, the coating 90 may be restricted to the particulate filter is arranged near the inlet end 75 and / or outlet end 76, 78. 在其他结构中,可能仅涂覆了某些通道80。 In other constructions, certain channels may be coated with only 80. 更进一步地,所述涂层90可能限制在所述颗粒过滤器75的中端82。 Still further, the coating 90 may be limited to the end 82 of the particulate filter 75. 可以预期的还有其他对所述颗粒过滤器75进行涂覆的配置。 It is contemplated that there are other of the particulate filter 75 arranged for coating.

[0013]三元催化涂层90的组成使得其可以从柴油机废气流中去除N0X。 Composition [0013] The catalytic coating 90 so that it can be removed from the diesel exhaust stream N0X. 为此,所述三元催化涂层90可包含不同量的稀有金属,例如,钼、钯和铑以及氧气存储催化剂。 For this purpose, the three-way catalytic coating 90 may contain different amounts of rare metals, e.g., molybdenum, palladium, and rhodium, and an oxygen storage catalyst. 也可以选择这些稀有金属用来在DPF65的再生事件过程中促进烟炱的氧化。 These precious metals can also choose to promote oxidation of soot in the course of a regeneration event DPF65. 例如,根据某些实施方式,三元催化涂层90可包括向用来再生的贵金属配方中添加铑,以使得所提供的配方可以使得烟炱氧化同时有助于NOx的降低。 For example, according to certain embodiments, the catalytic coating 90 may comprise a noble metal is added to the formulation used to regenerate the rhodium in such formulations may be provided such that the soot oxidation while helping to NOx reduction.

[0014] 除了可以有效地去除大量的NOx之外,相比于从未涂覆的具有相似结构的壁流式过滤器有效去除聚积烟炱的温度,在过滤器再生时所述三元催化涂层90还可以降低从所述壁流式过滤器75有效去除聚积烟炱的温度。 [0014] In addition to effectively remove a large amount of NOx than compared to uncoated wall flow filter having a similar structure to effectively remove accumulated soot temperature, the catalytic coating when the filter regeneration layer 90 can also be reduced from the wall-flow filter 75 effectively remove accumulated soot temperature. 更具体地,与裸露的DPF相比,所述DPF65上的三元催化涂层90可降低烟炱氧化反应的活化能,实现更高的烟炱氧化速率,因而促进了DPF65的清洁。 More specifically, as compared to bare the DPF, catalytic coating on the DPF65 90 can reduce the activation energy of the soot oxidation reaction, the higher the rate of soot oxidation, thus facilitating cleaning of the DPF65. 此外,由于DPF通常比DOC要大些,在后处理废气系统中,相比于三元催化剂典型可获得的容量,所述具有三元催化涂层90的DPF65的颗粒过滤器基底75则提供了相当大的容量。 Further, since the DPF is usually bigger than the DOC, the exhaust gas after-treatment system, compared to the typical three-way catalyst available capacity, the particulate filter having a three-way catalytic coating 90 DPF65 substrate 75 provides considerable capacity. 在所述后处理废气系统15,尤其是所述颗粒过滤器基底75中,如此增加的三元催化剂容量,,可能增加所述废气与三元催化剂接触的停留时间,并增加了三元催化涂层90的接触面积,因此更进一步地促进最大化所述NOx降低反应的速率和量。 The exhaust gas after-treatment system 15, particularly the particulate filter substrate 75, thus increasing the capacity of the three-way catalyst ,, the exhaust gas may increase the residence time in contact with the three-way catalyst, and increases the catalytic coating the contact area of ​​the layer 90, thus further promoting the rate and maximizing the amount of the NOx reduction reaction. 虽然涂覆的DPF65可在所述柴油机主体20的贫燃,稳态运转状态下去除N0X,但是其在具有更充分的燃料混合气的瞬时工况下更加有效。 Although the coating may be removed N0X DPF65 under the lean-burn diesel engine body 20, the steady operating state, but it is more effective in transient conditions having more sufficient fuel mixture. 根据某些实施方式,DPF65中的三元涂层90的包含范畴是D0C60中的三元催化涂层的补充或替代。 According to certain embodiments, terpolymers, the coating 90 comprises a DPF65 is visible to supplement or replace the catalytic coating of D0C60. 因此,在一些实施例中,所述D0C60包含三元催化剂涂层,DPF65上额外的三元涂层90可更进一步地促进NOx水平的降低。 Thus, in some embodiments, the three-way catalyst comprising coating D0C60, ternary additional coating 90 may further facilitate reducing NOx levels on the DPF65.

[0015] 所述方式和装置的各种实施例已经展示和描述出,值得关注的是,每个所公开实施例所体现出的原理可以扩展延伸同时仍旧落入如下权利要求的范围内。 [0015] The various embodiments of methods and apparatus have been shown and described, out of concern that the embodiments embodied the principles of the disclosed embodiments may be extended each extend while still within the scope of the following claims.

Claims (15)

1.一种用于柴油机废气系统的柴油颗粒过滤器,其包括: 颗粒过滤器,其具有配置为从柴油机废气流中去除柴油机废气颗粒的多个过滤器流动通道; 三元催化涂层,其布置于所述多个过滤器流动通道的表面上,用于与所述柴油机废气流相接触。 A diesel particulate filter for a diesel engine exhaust system, comprising: a particulate filter, having a filter configured to remove the plurality of flow passages of diesel exhaust particles from diesel engine exhaust stream; catalytic coating which disposed on a surface of the plurality of flow channels of the filter, for contact with the diesel exhaust stream.
2.如权利要求1所述的柴油颗粒过滤器,其特征在于,所述颗粒过滤器是壁流式过滤器。 2. The diesel particulate filter according to claim 1, wherein the particulate filter is a wall flow filter.
3.如权利要求1所述的柴油颗粒过滤器,其特征在于,所述三元催化涂层布置于邻近所述颗粒过滤器入口的多个过滤器流动通道的表面上。 3. The diesel particulate filter according to claim 1, wherein said catalytic coating is disposed on the surface of the filter a plurality of flow channels adjacent the inlet of the particulate filter.
4.如权利要求1所述的柴油颗粒过滤器,其特征在于,所述三元催化涂层布置于邻近壁流式过滤器出口的多个过滤器流动通道的表面上。 4. The diesel particulate filter according to claim 1, wherein said catalytic coating is disposed on the surface of the filter a plurality of flow channels adjacent the wall-flow filter outlet.
5.如权利要求1所述的柴油颗粒过滤器,其特征在于,相比于从未涂覆的具有相同结构的壁流式过滤器有效去除聚积烟炱的温度,在过滤器再生时所述三元催化涂层降低了从所述壁流式过滤器有效去除聚积烟炱的温度。 5. The diesel particulate filter according to claim 1, characterized in that, as compared to the uncoated wall flow filter having the same structure effectively remove accumulated soot temperature, regeneration of the filter catalytic coating reduces the temperature effectively remove accumulated soot from the wall-flow filter.
6.如权利要求1所述的柴油颗粒过滤器,其特征在于,所述三元催化涂层具有化学组合物,其与NOx反应以降低在所述柴油机废气流中的所述NOx的量。 6. The diesel particulate filter according to claim 1, characterized in that the catalytic coating has a chemical composition, which reacts with the NOx to reduce the amount in the diesel exhaust stream of NOx.
7.一种柴油机废气系统,其包含: 流动路径,其配置为与从柴油机主体流出的废气流连接,其中所述废气包含NOx和碳氢化合物; 柴油机氧化催化器,其配置为接收从所述流动路径流出的废气流,并降低废气中碳氢化合物的量; 柴油机颗粒过滤器,其配置为接收从所述柴油机氧化催化器流出的废气流,其中所述柴油机颗粒过滤器包含具有配置为与流动通过柴油机颗粒过滤器的废气流相接触的三元催化涂层的颗粒过滤器,以降低废气中NOx的量。 A diesel engine exhaust system, comprising: a flow path configured to be coupled to the exhaust stream from the diesel engine body, wherein the exhaust gas contains NOx and hydrocarbons; diesel oxidation catalyst that is configured to receive from the effluent flow path of exhaust gas flow, and reduce the amount of hydrocarbons in the exhaust gas; diesel particulate filter, which is configured to receive the exhaust gas stream flowing from the diesel oxidation catalyst, wherein the diesel particulate filter comprises a filter configured to flowing through the diesel particulate filter of the exhaust gas stream in contact with the catalytic coating of the particulate filter to reduce the amount of NOx in the exhaust gas.
8.如权利要求7所述的废气系统,其特征在于,所述颗粒过滤器是壁流式过滤器。 8. The exhaust system according to claim 7, wherein the particulate filter is a wall flow filter.
9.如权利要求7所述的废气系统,其特征在于,所述三元催化涂层布置于邻近所述壁流式过滤器入口的基底上。 9. The exhaust system according to claim 7, wherein said catalytic coating is disposed on the substrate adjacent to the wall-flow filter inlet.
10.如权利要求7所述的废气系统,其特征在于,所述三元催化涂层布置于邻近所述壁流式过滤器出口的基底上。 10. The exhaust system according to claim 7, wherein said catalytic coating is disposed on the substrate adjacent to the wall-flow filter outlet.
11.如权利要求7所述的废气系统,其特征在于,相比于从未涂覆的具有相同结构的壁流式过滤器有效去除聚积烟炱的温度,在过滤器再生时所述三元催化涂层配置成降低了从所述壁流式过滤器有效去除聚积烟炱的温度。 11. The exhaust system according to claim 7, characterized in that, as compared to the uncoated wall flow filter having the same structure effectively remove accumulated soot temperature, when the three-way filter regeneration catalytic coating is configured to reduce the temperature of the accumulated soot effectively removed from the wall flow filter.
12.如权利要求11所述的废气系统,其特征在于,所述柴油氧化催化器布置于燃料投配器和柴油颗粒过滤器之间。 12. The exhaust system according to claim 11, wherein the diesel oxidation catalyst disposed between a fuel doser and a diesel particulate filter.
13.如权利要求7所述的废气系统,其特征在于,所述柴油氧化催化器包含三元催化涂层。 13. The exhaust system according to claim 7, wherein the diesel oxidation catalyst comprises a catalytic coating.
14.一种柴油机系统,其包含: 柴油机主体,其包含分别与一个或多个汽缸相联合的一个或多个火花塞; 空气燃料混合器,其配置为在所述一个或多个汽缸中分别控制由所述一个或多个火花塞所点燃燃料的空燃比,其中所述空气/燃料混合物进一步地配置为提高所述空燃比以响应柴油机系统的瞬时工况; 后处理废气系统,其配置为接收在一个或多个汽缸中产生的废气,其中所述后处理废气系统包含被三元催化剂涂覆的颗粒过滤器,其中所述三元催化涂层配置为与通过所述颗粒过滤器的废气流相接触以降低废气流中的NOx。 A diesel engine system, comprising: a diesel engine body, which comprises one or more spark plugs with one or more cylinders each phase combination; air-fuel mixer, are configured to control one or more of the cylinders air-fuel ratio of the fuel by the spark plug ignites the one or more, wherein the air / fuel mixture is further arranged to improve the transient condition in response to the air-fuel ratio of the diesel engine system; exhaust aftertreatment system configured to receive one or more exhaust gas generated in the cylinders, wherein the exhaust aftertreatment system comprising a particulate filter being coated three-way catalyst, wherein the catalytic coating is configured with the exhaust gas flow through the particle filter phase contacting reduce NOx in the exhaust stream.
15.如权利要求14所述的废气系统, 其特征在于,所述DOC具有三元催化涂层。 15. The exhaust system according to claim 14, characterized in that the DOC having a catalytic coating.
CN201210595815.XA 2012-11-12 2012-11-12 Diesel particulate filter provided with three-way catalytic coatings CN103806987A (en)

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