摘要:
The present invention provides a catalyst for use in a NOx trap that has reduced NOx release during rich purges, increased NO conversion efficiency under stoichiometric conditions, and improved sulfur tolerance. The catalyst of this embodiment includes a precious metal, an oxygen storage component in contact with the precious metal, and a NOx storage material. The oxygen storage component in contact with the precious metal is present in an amount that provides sufficient oxygen storage capacity to reduce the NOx release from the NOx trap during rich purges to less than 20% of the NOx that is stored in the NOx trap across the operating temperature window of the NOx trap, increase the NOx conversion efficiency under stoichiometric conditions to a value greater than 70%, and increase the sulfur tolerance of the NOx trap.
摘要翻译:本发明提供了一种用于在富集清洗期间减少NO x释放,在化学计量条件下提高NO转化效率和改善硫耐受性的NO X阱捕集器中的催化剂。 该实施方案的催化剂包括贵金属,与贵金属接触的储氧组分和NO x X存储材料。 与贵金属接触的储氧组分以提供足够的储氧能力的量存在,以便在富含清洗期间将NO x 2+释放从NO X 2捕集器中减少至 在NO SUB>陷阱的工作温度窗口中存储在NO SUB>陷阱中的小于20%的NO SUB>增加了 在化学计量条件下的转化效率为大于70%的值,并且增加了NO x陷阱的耐硫性。
摘要:
A mechanical apparatus including a combustion engine, a conduit for transporting an exhaust stream away from the engine, a first catalytic NOx storage and conversion region disposed along the conduit, and a second catalytic NOx storage and conversion region disposed along the conduit at a location downstream from the first catalytic NOx storage and conversion region is disclosed. Each of the first catalytic NOx storage and conversion region and the second catalytic NOx storage and conversion region includes at least one catalytic metal configured to convert NOx to NO2 when the engine is supplied a lean air/fuel mixture, and at least one NOx adsorbing compound configured to adsorb NO2 for storage when the engine is supplied a lean air/fuel mixture, and wherein the one of the first and the second catalytic NOx storage and conversion regions has a lower concentration of catalytic metal than the other of the first and second catalytic NOx storage and conversion regions.
摘要翻译:一种机械设备,包括内燃机,用于将排气流输送离开发动机的导管,沿导管设置的第一催化剂NO x X存储和转化区域,以及第二催化剂NO x 公开了沿着导管设置在第一催化剂NO x存储和转换区域下游的位置的 SUB>存储和转换区域。 第一催化NO x X存储和转化区域和第二催化剂NO x存储和转化区域中的每一个包括至少一种催化金属,其被配置成将NO x x 在发动机供给稀薄空气/燃料混合物时,至少一个NO 2吸附化合物配置成吸附NO 2 / SUB>用于在发动机供应稀薄空气/燃料混合物时存储,并且其中第一和第二催化剂NO x存储和转化区域中的一个具有比其他催化剂更低的催化金属浓度 的第一和第二催化剂NO x存储和转化区域。
摘要:
In an apparatus having a combustion engine and an emissions system including a catalytic converter and a metal oxide catalyst disposed downstream of the catalytic converter, a method of controlling a chemical transformation of hydrogen sulfide in an emissions stream to a less-noxious sulfur-containing compound is disclosed. The method includes reacting the hydrogen sulfide with the metal oxide catalyst to form a metal sulfide, monitoring a saturation of the metal oxide catalyst with the metal sulfide, and when a predetermined saturation of metal sulfide on the metal oxide is reached, changing an air/fuel ratio supplied to the combustion engine.
摘要:
A method for remediating an emission containing NOx emissions includes introducing an exotherm generating agent into the NOx emissions when the inlet temperature of the NOx emissions is in a range of 300° C. to 600° C. and an air/fuel ratio is greater than or equal to 15; exposing the NOx emissions to a lean NOx trap; introducing a reducing agent into the emissions when the inlet temperature of the emissions is greater than 130° C. and less than 600° C.; exposing the NOx emissions having an air/fuel ratio greater than or equal to 15 to a selective catalytic reduction catalyst; and producing a remediated emission having an air/fuel ratio greater than or equal to 15.
摘要:
The present invention provides a thermally stable catalyst for treating automobile exhaust by-products is provided. The catalyst of the invention comprises a first section that includes a precious metal present in a first concentration and a second section that includes a precious metal present in a second concentration. The catalyst of the invention is characterized by a unique precious metal concentration profile in which the first concentration of the precious metal is lower than the second concentration of the precious metal. When placed with an automobile exhaust system, the second section is positioned downstream of the first section. The present invention also provides a lean NOx trap utilizing the unique precious metal concentration profile. The NOx trap is found to possess improved NO storage capacity upon thermal aging relative to a NOx trap with the same total amount of precious metal deposited uniformly over the volume of the trap.
摘要:
The present invention provides a catalyst for use in a NOx trap that has reduced NOx release during rich purges, increased NO conversion efficiency under stoichiometric conditions, and improved sulfur tolerance. The catalyst of this embodiment includes a precious metal, an oxygen storage component in contact with the precious metal, and a NOx storage material. The oxygen storage component in contact with the precious metal is present in an amount that provides sufficient oxygen storage capacity to reduce the NOx release from the NOx trap during rich purges to less than 20% of the NOx that is stored in the NOx trap across the operating temperature window of the NOx trap, increase the NOx conversion efficiency under stoichiometric conditions to a value greater than 70%, and increase the sulfur tolerance of the NOx trap.
摘要翻译:本发明提供了一种用于在富集清洗期间减少NO x释放,在化学计量条件下提高NO转化效率和改善硫耐受性的NO X阱捕集器中的催化剂。 该实施方案的催化剂包括贵金属,与贵金属接触的储氧组分和NO x X存储材料。 与贵金属接触的储氧组分以提供足够的储氧能力的量存在,以便在富含清洗期间将NO x 2+释放从NO X 2捕集器中减少至 在NO SUB>陷阱的工作温度窗口中存储在NO SUB>陷阱中的小于20%的NO SUB>增加了 在化学计量条件下的转化效率为大于70%的值,并且增加了NO x陷阱的耐硫性。
摘要:
A method for remediating an emission containing NOx emissions includes introducing an exotherm generating agent into the NOx emissions when the inlet temperature of the NOx emissions is in a range of 300° C. to 600° C. and an air/fuel ratio is greater than or equal to 15; exposing the NOx emissions to a lean NOx trap; introducing a reducing agent into the emissions when the inlet temperature of the emissions is greater than 130° C. and less than 600° C.; exposing the NOx emissions having an air/fuel ratio greater than or equal to 15 to a selective catalytic reduction catalyst; and producing a remediated emission having an air/fuel ratio greater than or equal to 15.
摘要:
A method of desulfating a catalytic NOx storage and conversion device is disclosed, wherein the method includes determining an amount of sulfur stored in the catalytic NOx storage and conversion device; determining an interval for exposing the catalytic NOx storage and conversion device to a rich exhaust stream based upon the determined amount of sulfur stored, wherein the interval is longer for lower amounts of sulfur stored and shorter for higher amounts of sulfur stored; and exposing the catalytic NOx storage and conversion device to the rich exhaust stream for the determined interval.
摘要翻译:公开了一种脱硫催化NO x X存储和转化装置的方法,其中所述方法包括确定储存在催化NO x存储和转换装置中的硫的量; 基于所确定的硫的量确定用于将催化NO x X存储和转化装置暴露于富排气流的间隔,其中对于较低量的硫储存而言间隔更长,较高量的较短量 的硫储存; 并将催化NO x X存储和转换装置暴露于浓排气流达所确定的间隔。