公开(公告)号：US08383544B2

公开(公告)日：2013-02-26

申请号：US12599411

申请日：2008-04-16

申请人： Stephan Eckhoff ,  Meike Wittrock ,  Ulrich Goebel ,  Ina Grisstede ,  Ruediger Hoyer ,  Wilfried Mueller ,  Thomas Kreuzer ,  Maria Cristina Casapu ,  Jan-Dierk Grunwaldt ,  Marek Maciejewski ,  Aflons Baiker

发明人： Stephan Eckhoff ,  Meike Wittrock ,  Ulrich Goebel ,  Ina Grisstede ,  Ruediger Hoyer ,  Wilfried Mueller ,  Thomas Kreuzer ,  Maria Cristina Casapu ,  Jan-Dierk Grunwaldt ,  Marek Maciejewski ,  Aflons Baiker

IPC分类号： B01J23/58

CPC分类号： B01J35/002 ,  B01D53/9422 ,  B01D53/96 ,  B01D2255/2042 ,  B01D2255/2065 ,  B01J23/002 ,  B01J23/63 ,  B01J23/96 ,  B01J38/04 ,  B01J38/06 ,  B01J38/08 ,  B01J2523/00 ,  B01J2523/25 ,  B01J2523/3712 ,  B01J2523/828

摘要： Nitrogen oxide storage catalysts are used to remove the nitrogen oxides present in the lean exhaust gas of lean-burn engines. As a result of the stress due to high temperatures in vehicle operation, they are subject to thermal aging processes which affect both the nitrogen oxide storage components and the noble metals present as catalytically active components. The present invention provides a process with which the catalytic activity of a nitrogen oxide storage catalyst which comprises, in addition to platinum as a catalytically active component, basic compounds of strontium and/or barium on a support material comprising cerium oxide, said catalytic activity being lost owing to the thermal aging process, can be at least partly restored. The two-stage process is based on the fact that strontium and/or barium compounds formed during the thermal aging with the support material, which also comprise platinum, are recycled to the catalytically active forms by controlled treatment with specific gas mixtures.

摘要翻译： 氮氧化物储存催化剂用于去除贫燃发动机的贫废气中存在的氮氧化物。 由于车辆操作中的高温引起的应力的结果，它们受到影响作为催化活性组分存在的氮氧化物存储组分和贵金属两者的热老化过程。 本发明提供了一种氮氧化物储存催化剂的催化活性的方法，除了铂作为催化活性组分之外，还包括锶和/或钡的碱性化合物在包含氧化铈的载体材料上，所述催化活性为 由于热老化过程而损失，可以至少部分恢复。 两阶段工艺是基于以下事实：在热老化期间形成的锶和/或钡化合物与支撑材料（其也包含铂）通过用特定气体混合物的控制处理再循环至催化活性形式。

公开(公告)号：US07638452B2

公开(公告)日：2009-12-29

申请号：US11995590

申请日：2006-07-15

申请人： Meike Wittrock ,  Ulrich Goebel ,  Thomas Kreuzer ,  Christina Maria Casapu ,  Jan-Dierk Grunwaldt ,  Marek Maciejewski ,  Alfons Baiker

发明人： Meike Wittrock ,  Ulrich Goebel ,  Thomas Kreuzer ,  Christina Maria Casapu ,  Jan-Dierk Grunwaldt ,  Marek Maciejewski ,  Alfons Baiker

IPC分类号： B01J38/06 ,  B01J8/02

CPC分类号： B01J38/06 ,  B01D53/9409 ,  B01J23/002 ,  B01J23/10 ,  B01J23/63 ,  B01J23/92 ,  B01J23/96 ,  B01J2523/00 ,  F01N3/035 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0885 ,  F01N3/103 ,  F01N13/02 ,  F01N2430/08 ,  F01N2550/03 ,  F02B29/0437 ,  F02D41/0055 ,  F02D41/0275 ,  Y02A50/2322 ,  Y02T10/22 ,  B01J2523/25 ,  B01J2523/3712 ,  B01J2523/828

摘要： Nitrogen oxide storage catalysts are used for removing the nitrogen oxides present in the lean-burn exhaust gas of lean-burn engines. Here, the purifying action is based on the nitrogen oxides being stored in the form of nitrates by the storage material of the storage catalyst during a lean-burn operating phase of the engine and the previously formed nitrates being decomposed in a subsequent rich-burn operating phase of the engine and the nitrogen oxides which are being liberated again being reacted with the reducing exhaust gas constituents over the storage catalyst to form nitrogen, carbon dioxide and water. Storage catalysts are thermally aged by high temperatures. The aging is due to sintering of the catalytically active noble metal components of the catalyst and to formation of compounds of the storage components with the support materials. According to the invention, the formation of compounds of the storage materials can be largely reversed by treatment of the storage material with a gas mixture comprising nitrogen dioxide and/or carbon dioxide and water vapor at temperatures of from 300 to 500° C. The reactivation can be carried out either directly on the vehicle by setting appropriate exhaust gas conditions or during a routine service by removal of the catalyst from the vehicle and treatment with a gas mixture in an appropriate apparatus.

摘要翻译： 氮氧化物储存催化剂用于除去贫燃发动机的稀燃废气中存在的氮氧化物。 这里，净化作用是基于在发动机的稀薄燃烧操作阶段期间由储存催化剂的储存材料以硝酸盐的形式储存的氮氧化物，并且先前形成的硝酸盐在随后的富燃烧操作中被分解 再次释放的发动机和氮氧化物的相与还原废气成分反应，形成氮气，二氧化碳和水。 储存催化剂通过高温热老化。 老化是由于催化剂的催化活性贵金属组分的烧结以及用载体材料形成储存组分的化合物。 根据本发明，存储材料的化合物的形成可以通过在包含二氧化氮和/或二氧化碳和水蒸汽的气体混合物中在300-500℃的温度下处理储存材料而大大地逆转。再活化 可以直接在车辆上进行，通过设定适当的废气条件或者在例行服务期间通过从车辆中除去催化剂并在合适的装置中用气体混合物进行处理。

公开(公告)号：US20090131243A1

公开(公告)日：2009-05-21

申请号：US11995590

申请日：2006-07-15

申请人： Meike Wittrock ,  Ulrich Goebel ,  Thomas Kreuzer ,  Cristina Maria Casapu ,  Jan-Dierk Grunwaldt ,  Marek Maciejewski ,  Alfons Baiker

发明人： Meike Wittrock ,  Ulrich Goebel ,  Thomas Kreuzer ,  Cristina Maria Casapu ,  Jan-Dierk Grunwaldt ,  Marek Maciejewski ,  Alfons Baiker

IPC分类号： B01J38/06

CPC分类号： B01J38/06 ,  B01D53/9409 ,  B01J23/002 ,  B01J23/10 ,  B01J23/63 ,  B01J23/92 ,  B01J23/96 ,  B01J2523/00 ,  F01N3/035 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0885 ,  F01N3/103 ,  F01N13/02 ,  F01N2430/08 ,  F01N2550/03 ,  F02B29/0437 ,  F02D41/0055 ,  F02D41/0275 ,  Y02A50/2322 ,  Y02T10/22 ,  B01J2523/25 ,  B01J2523/3712 ,  B01J2523/828

摘要： Nitrogen oxide storage catalysts are used for removing the nitrogen oxides present in the lean-burn exhaust gas of lean-burn engines. Here, the purifying action is based on the nitrogen oxides being stored in the form of nitrates by the storage material of the storage catalyst during a lean-burn operating phase of the engine and the previously formed nitrates being decomposed in a subsequent rich-burn operating phase of the engine and the nitrogen oxides which are being liberated again being reacted with the reducing exhaust gas constituents over the storage catalyst to form nitrogen, carbon dioxide and water. Storage catalysts are thermally aged by high temperatures. The aging is due to sintering of the catalytically active noble metal components of the catalyst and to formation of compounds of the storage components with the support materials. According to the invention, the formation of compounds of the storage materials can be largely reversed by treatment of the storage material with a gas mixture comprising nitrogen dioxide and/or carbon dioxide and water vapor at temperatures of from 300 to 500° C. The reactivation can be carried out either directly on the vehicle by setting appropriate exhaust gas conditions or during a routine service by removal of the catalyst from the vehicle and treatment with a gas mixture in an appropriate apparatus.

摘要翻译： 氮氧化物储存催化剂用于除去贫燃发动机的稀燃废气中存在的氮氧化物。 这里，净化作用是基于在发动机的稀薄燃烧操作阶段期间由储存催化剂的储存材料以硝酸盐的形式储存的氮氧化物，并且先前形成的硝酸盐在随后的富燃烧操作中被分解 再次释放的发动机和氮氧化物的相与还原废气成分反应，形成氮气，二氧化碳和水。 储存催化剂通过高温热老化。 老化是由于催化剂的催化活性贵金属组分的烧结以及用载体材料形成储存组分的化合物。 根据本发明，存储材料的化合物的形成可以通过在包含二氧化氮和/或二氧化碳和水蒸汽的气体混合物中在300-500℃的温度下处理储存材料而大大地逆转。再活化 可以直接在车辆上进行，通过设定适当的废气条件或者在例行服务期间通过从车辆中除去催化剂并在合适的装置中用气体混合物进行处理。

公开(公告)号：US20110258982A1

公开(公告)日：2011-10-27

申请号：US12304843

申请日：2007-06-05

申请人： Stephan Eckhoff ,  Meike Wittrock ,  Ulrich Goebel ,  Wilfried Mueller ,  Thomas Kreuzer

发明人： Stephan Eckhoff ,  Meike Wittrock ,  Ulrich Goebel ,  Wilfried Mueller ,  Thomas Kreuzer

IPC分类号： F01N3/18

CPC分类号： F01N3/0885 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/101 ,  F01N3/103 ,  F01N13/009 ,  F01N13/011 ,  F01N13/107 ,  F01N2250/12 ,  F01N2260/04 ,  F01N2330/06 ,  F01N2430/06 ,  Y02A50/2324 ,  Y02T10/22

摘要： Nitrogen oxide storage catalysts are used to remove the nitrogen oxides present in the lean exhaust gas of lean-burn engines. Storage catalysts are thermally aged by high temperatures. Ageing is due to sintering of the catalytically active noble metal components of the catalyst and to formation of compounds of the storage components with the support materials. According to the invention, the formation of compounds of the storage materials can be largely reversed by treatment of the storage material with a gas mixture containing carbon dioxide, optionally water vapor and optionally nitrogen oxides at temperatures in the range from 200° C. to 950° C., preferably from 300° C. to 700° C. The reactivation can be carried out under emission-neutral conditions directly in the vehicle during driving operation by setting of suitable exhaust gas conditions and regulating the air/fuel ratio.

摘要翻译： 氮氧化物储存催化剂用于去除贫燃发动机的贫废气中存在的氮氧化物。 储存催化剂通过高温热老化。 老化是由于催化剂的催化活性贵金属组分的烧结以及用载体材料形成储存组分的化合物。 根据本发明，存储材料的化合物的形成可以通过用包含二氧化碳，任选的水蒸汽和任选的氮氧化物的气体混合物在200℃至950℃的温度范围内处理储存材料而大大逆转 ℃，优选为300℃至700℃。通过设定合适的废气条件并调节空气/燃料比，可以在驾驶操作期间直接在车辆的发射 - 中性条件下进行再活化。

公开(公告)号：US20100037597A1

公开(公告)日：2010-02-18

申请号：US12519989

申请日：2007-12-21

申请人： Stephan Eckhoff ,  Ulrich Goebel ,  Susanne Philipp ,  Wilfried Mueller ,  Thomas Kreuzer

发明人： Stephan Eckhoff ,  Ulrich Goebel ,  Susanne Philipp ,  Wilfried Mueller ,  Thomas Kreuzer

IPC分类号： F01N9/00 ,  F01N3/023 ,  F01N3/10

CPC分类号： F01N3/0814 ,  F01N3/0842 ,  F01N3/0871 ,  F01N3/2073 ,  F01N13/009 ,  F01N13/0097 ,  F01N13/011 ,  F01N2570/18 ,  F01N2610/03 ,  F02D41/0082 ,  F02D41/0275 ,  Y02T10/24

摘要： An emission control system for the cleaning of the exhaust gases of a lean burn engine with two or more cylinders comprises a first exhaust leg for the exhaust gases of a first group of cylinders and a second exhaust leg for the exhaust gases of a second group of cylinders. A nitrogen oxide storage catalyst is arranged in each exhaust leg. The two exhaust legs are combined downstream of the storage catalysts at a confluence to form a common exhaust leg. The common exhaust leg contains an SCR catalyst. The first and second groups of cylinders are each supplied alternately in periodic intervals with lean and rich air/fuel mixtures. Lean or rich exhaust gases are thus obtained in the combustion in the cylinders and released into the corresponding exhaust legs. Lean and rich exhaust gases are adjusted with respect to one another so as to result in a lean exhaust gas after the combination of the exhaust gases in the common exhaust leg. The regeneration of the storage catalysts may result in the formation of ammonia, which is stored by the SCR catalyst and reacted with nitrogen oxides which pass through the storage catalysts in an unwanted manner during the storage phases.

摘要翻译： 用于清洁具有两个或多个气缸的稀薄燃烧发动机的废气的排放控制系统包括用于第一组气缸的排气的第一排气支管和用于第二组气缸的废气的第二排气支管 气瓶。 在每个排气支管中设置氮氧化物储存催化剂。 两个排气支路在汇合处在储存催化剂的下游组合以形成共同的排气支路。 普通排气支架含有SCR催化剂。 第一组和第二组汽缸分别以稀薄和浓缩的空气/燃料混合物以周期性间隔交替供应。 因此，在气缸中的燃烧中获得精益或浓缩的废气，并将其排放到相应的排气支管中。 精益和丰富的废气相对于彼此进行调节，以便在共同排气支路中排出的废气组合之后产生贫乏的废气。 储存催化剂的再生可导致氨的形成，其由SCR催化剂储存并与在储存阶段期间以不期望的方式通过储存催化剂的氮氧化物反应。

公开(公告)号：US20090062117A1

公开(公告)日：2009-03-05

申请号：US10593986

申请日：2005-03-23

申请人： Juliane Kluge ,  Ulrich Goebel ,  Meike Wittrock ,  Markus Kogel ,  Thomas Kreuzer

发明人： Juliane Kluge ,  Ulrich Goebel ,  Meike Wittrock ,  Markus Kogel ,  Thomas Kreuzer

IPC分类号： B01J23/10 ,  B32B15/20

CPC分类号： B01D53/9422 ,  B01D2255/102 ,  B01D2255/202 ,  B01D2255/204 ,  B01D2255/2063 ,  B01D2255/2065 ,  B01D2255/2066 ,  B01D2255/2068 ,  B01D2255/91 ,  B01J21/10 ,  B01J23/02 ,  B01J23/10 ,  B01J23/63 ,  B01J37/0205 ,  B01J37/0207 ,  B01J37/0248

摘要： A nitrogen oxide storage material which is based on storage compounds of elements selected from the group consisting of magnesium, calcium, strontium, barium, the alkali metals, the rare earth metals and mixtures thereof and has a homogeneous magnesium-aluminium mixed oxide doped with cerium oxide as support material for the storage compounds is described. Nitrogen oxide storage catalysts using this storage material display a broad working range, a high storage efficiency and good ageing resistance.

摘要翻译： 一种氮氧化物储存材料，其基于选自镁，钙，锶，钡，碱金属，稀土金属及其混合物的元素的储存化合物，并且具有掺杂有铈的均匀的镁 - 铝混合氧化物 描述了作为储存化合物的载体材料的氧化物。 使用该储存材料的氮氧化物储存催化剂具有广泛的工作范围，高储存效率和良好的耐老化性。

公开(公告)号：US08230674B2

公开(公告)日：2012-07-31

申请号：US11722135

申请日：2005-12-17

申请人： Stephan Bremm ,  Christian Manfred Tomanik ,  Ulrich Goebel ,  Wilfried Mueller ,  Thomas Kreuzer

发明人： Stephan Bremm ,  Christian Manfred Tomanik ,  Ulrich Goebel ,  Wilfried Mueller ,  Thomas Kreuzer

IPC分类号： F01N3/00

CPC分类号： F01N11/00 ,  F01N3/0814 ,  F01N3/0842 ,  F01N3/0864 ,  F01N13/009 ,  F01N13/0093 ,  F01N2550/03 ,  Y02T10/47

摘要： Modern exhaust-gas purification systems in motor vehicles with a lean-burn engine include a starting catalyst fitted close to the engine and a main catalyst arranged in the underbody region, with both the starting catalyst and the main catalyst being formed by nitrogen oxide storage catalysts. The nitrogen oxide storage catalysts are in each case regenerated by the engine being briefly switched from lean-burn mode to rich-burn mode when the nitrogen oxide concentration in the exhaust gas downstream of the storage catalysts rises above a predetermined value.The starting catalyst is exposed to particularly high temperatures and is therefore prone to faster ageing of its nitrogen oxide storage capacity than the main catalyst. To check the nitrogen oxide storage capacity of the starting catalyst, a regeneration which is due for the catalyst system is selected in such a way in terms of its duration and the extent to which the exhaust gas is enriched that substantially only the starting catalyst is regenerated, whereas the main catalyst is not. In this arrangement, the criterion for terminating this partial regeneration is the breakthrough of rich exhaust gas through the starting catalyst. After the engine has been switched back to lean-burn mode, the time which elapses until the concentration of nitrogen oxides in the exhaust gas downstream of the catalyst requires regeneration again is measured. The measured time is a measure of the remaining nitrogen oxide storage capacity of the starting catalyst.

摘要翻译： 具有稀燃燃烧发动机的机动车辆中的现代废气净化系统包括安装在发动机附近的起动催化剂和布置在底体区域中的主催化剂，起始催化剂和主催化剂由氮氧化物储存催化剂形成 。 当存储催化剂下游的废气中的氮氧化物浓度升高到预定值以上时，氮氧化物储存催化剂在每种情况下都可通过发动机从稀燃模式短暂切换为富燃模式。 起始催化剂暴露于特别高的温度，因此比主催化剂容易发生氮氧化物储存容量的老化。 为了检查起始催化剂的氮氧化物存储容量，选择催化剂体系所致的再生，就其持续时间和废气浓缩程度而言，基本上只有起始催化剂被再生 ，而主催化剂不是。 在这种布置中，终止这种部分再生的标准是通过起动催化剂的富排气的突破。 在发动机已经切换回稀燃模式之后，测量在催化剂下游的废气中的氮氧化物浓度再次需要再次之前经过的时间。 测量时间是起始催化剂的剩余氮氧化物储存容量的量度。

公开(公告)号：US07905087B2

公开(公告)日：2011-03-15

申请号：US11995765

申请日：2006-06-22

申请人： Ulrich Goebel ,  Stephan Bremm ,  Christian Manfred Tomanik ,  Wilfried Mueller ,  Thomas Kreuzer

发明人： Ulrich Goebel ,  Stephan Bremm ,  Christian Manfred Tomanik ,  Wilfried Mueller ,  Thomas Kreuzer

IPC分类号： F01N3/00

CPC分类号： B01D53/9495 ,  B01D53/9431 ,  B01D53/96 ,  F01N3/0807 ,  F01N3/22 ,  F01N3/32 ,  Y02T10/20

摘要： Nitrogen oxide storage catalytic converters for purifying the exhaust gas of lean-burn engines are periodically regenerated by switching the engine from lean-burn mode to rich-burn mode. After regeneration has taken place, the engine is switched back to lean-burn mode. At this time, rich exhaust gas is still flowing in the exhaust line from the engine to the catalytic converter, which rich exhaust gas is ejected via the catalytic converter into the environment by the following, lean exhaust gas. This leads to brief emissions peaks of the rich exhaust gas constituents and impairs the level of exhaust gas cleaning which can be obtained. In order to solve said problem, it is proposed to create oxidizing conditions by injecting air upstream of the storage catalytic converter, so that the rich exhaust gas constituents still flowing in the exhaust line upstream of the storage catalytic converter can be converted at the storage catalytic converter to form non-harmful products. The proposed method can lead to a considerable improvement in exhaust gas purification in particular in the case of catalytic converters which are already impaired in terms of their storage capacity through aging, and which must be regenerated significantly more frequently than fresh catalytic converters.

摘要翻译： 通过将发动机从稀燃模式切换到富燃烧模式，周期性地再生用于净化贫燃发动机废气的氧化氮储存催化转化器。 发生再生后，发动机切换回稀燃模式。 此时，排气管道中的废气仍然从发动机流向催化转化器，其中，废气通过下列稀释废气通过催化转化器排放到环境中。 这导致了丰富的废气成分的短暂的排放峰值，并损害了可以获得的废气净化水平。 为了解决上述问题，提出了通过在储存催化转化器的上游喷射空气来产生氧化条件，使得能够在储存催化转化器的上游排出的排气管中仍然流动的富排气成分在储存催化剂 转换器形成无害产品。 所提出的方法可以导致废气净化的显着改进，特别是在催化转化器的情况下，其通过老化而在储存容量方面已经受损，并且必须比新鲜催化转化器显着更频繁地再生。

公开(公告)号：US07832201B2

公开(公告)日：2010-11-16

申请号：US11722149

申请日：2005-12-24

申请人： Stephan Bremm ,  Christian Manfred Tomanik ,  Ulrich Goebel ,  Wilfried Mueller ,  Thomas Kreuzer

发明人： Stephan Bremm ,  Christian Manfred Tomanik ,  Ulrich Goebel ,  Wilfried Mueller ,  Thomas Kreuzer

IPC分类号： F01N3/00

CPC分类号： F02D41/0275 ,  B01D53/9495 ,  B01D53/96 ,  F01N3/0814 ,  F01N3/0885

摘要： To remove the nitrogen oxides from the exhaust gas from lean-burn engines, these engines are equipped with a nitrogen oxide storage catalyst, which has to be regenerated frequently by the engine being briefly switched to rich-burn mode. The regeneration is usually initiated when the nitrogen oxide concentration downstream of the catalyst rises above a permissible value. In this context, there is a risk of the bed temperature of the catalyst during and after regeneration being pushed into a range with incipient thermal desorption of the nitrogen oxides on account of the heat which is released during the conversion of the nitrogen oxides by the reducing constituents of the exhaust gas. This can lead to increased nitrogen oxide emission both during the regeneration itself and after the engine has been switched back to lean-burn mode. To eliminate this problem, it is proposed to divide the rich-burn mode into two rich pulses which follow one another in time, the first rich pulse being of shorter duration than the second rich pulse.

摘要翻译： 为了从贫燃发动机的排气中除去氮氧化物，这些发动机配备有氮氧化物储存催化剂，其必须经过发动机的短时间切换为富燃烧模式而频繁地再生。 当催化剂下游的氮氧化物浓度高于允许值时，通常开始再生。 在这种情况下，存在在再生期间和之后将催化剂的床温度推到具有氮氧化物的初期热解吸的范围内的风险，这是由于在氮氧化物转化期间释放的热量通过还原 排气成分。 这可以导致在再生期间和发动机已经切换回稀燃模式之后氮氧化物排放增加。 为了消除这个问题，提出将富燃烧模式分成时间上相互依赖的两个富脉冲，第一富脉冲的持续时间比第二富脉冲短。

公开(公告)号：US20090145112A1

公开(公告)日：2009-06-11

申请号：US11995765

申请日：2006-06-22

申请人： Ulrich Goebel ,  Stephan Bremm ,  Christian Manfred Tomanik ,  Wilfried Mueller ,  Thomas Kreuzer

发明人： Ulrich Goebel ,  Stephan Bremm ,  Christian Manfred Tomanik ,  Wilfried Mueller ,  Thomas Kreuzer

IPC分类号： F01N9/00

CPC分类号： B01D53/9495 ,  B01D53/9431 ,  B01D53/96 ,  F01N3/0807 ,  F01N3/22 ,  F01N3/32 ,  Y02T10/20

摘要： Nitrogen oxide storage catalytic converters for purifying the exhaust gas of lean-burn engines are periodically regenerated by switching the engine from lean-burn mode to rich-burn mode. After regeneration has taken place, the engine is switched back to lean-burn mode. At this time, rich exhaust gas is still flowing in the exhaust line from the engine to the catalytic converter, which rich exhaust gas is ejected via the catalytic converter into the environment by the following, lean exhaust gas. This leads to brief emissions peaks of the rich exhaust gas constituents and impairs the level of exhaust gas cleaning which can be obtained. In order to solve said problem, it is proposed to create oxidizing conditions by injecting air upstream of the storage catalytic converter, so that the rich exhaust gas constituents still flowing in the exhaust line upstream of the storage catalytic converter can be converted at the storage catalytic converter to form non-harmful products. The proposed method can lead to a considerable improvement in exhaust gas purification in particular in the case of catalytic converters which are already impaired in terms of their storage capacity through aging, and which must be regenerated significantly more frequently than fresh catalytic converters.

摘要翻译： 通过将发动机从稀燃模式切换到富燃烧模式，周期性地再生用于净化贫燃发动机废气的氧化氮储存催化转化器。 发生再生后，发动机转回稀燃模式。 此时，排气管道中的废气仍然从发动机流向催化转化器，其中，废气通过下列稀释废气通过催化转化器排放到环境中。 这导致了丰富的废气成分的短暂的排放峰值，并损害了可以获得的废气净化水平。 为了解决上述问题，提出了通过在储存催化转化器的上游喷射空气来产生氧化条件，使得能够在储存催化转化器的上游排出的排气管中仍然流动的富排气成分在储存催化剂 转换器形成无害产品。 所提出的方法可以导致废气净化的显着改进，特别是在催化转化器的情况下，其通过老化而在储存容量方面已经受损，并且必须比新鲜催化转化器显着更频繁地再生。