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    • 8. 发明申请
    • Zone coated catalyst to simultaneously reduce NOx and unreacted ammonia
    • 区域涂层催化剂同时还原NOx和未反应的氨
    • US20060039843A1
    • 2006-02-23
    • US10925018
    • 2004-08-23
    • Joseph PatchettJoseph Dettling
    • Joseph PatchettJoseph Dettling
    • B01D53/56
    • B01D53/9418B01D53/9436B01D53/9477B01D2255/1021B01D2255/2065B01D2255/20707B01D2255/20723B01D2255/20761B01D2255/20776B01D2255/502B01D2255/9155B01J23/63B01J35/0006F01N3/035F01N3/2066F01N13/009F01N13/0093F01N13/0097F01N2510/0682Y02T10/24
    • Provided is an emissions treatment system and method for reducing NOx emissions in the exhaust stream produced from an internal combustion engine. The system has an injector for periodically metering ammonia or an ammonia precursor into an exhaust stream; and a first substrate with a first SCR catalyst composition, downstream of the injector. The first substrate has an inlet end, an outlet end, a length extending between the inlet end to the outlet end, wall elements and a plurality of passages defined by the wall elements. The first SCR catalyst composition is disposed on the wall elements from the inlet end toward the outlet end to a length that is less than the substrate's axial length to form an inlet zone. The first substrate also has an NH3 destruction catalyst composition with a platinum group metal component dispersed on a refractory metal oxide. The NH3 destruction catalyst is disposed on the wall elements from the outlet end toward the inlet end to a length that is less than the substrate's axial length to form an outlet zone. Generally, there is from 0.1 to 10 g/ft3 of platinum group metal component in the outlet zone.
    • 提供了一种用于减少由内燃机产生的废气流中的NOx排放的排放处理系统和方法。 该系统具有用于将氨或氨前体周期性地计量到排气流中的喷射器; 以及具有第一SCR催化剂组合物的第一衬底,在喷射器的下游。 第一衬底具有入口端,出口端,在入口端到出口端之间延伸的长度,壁元件和由壁元件限定的多个通道。 第一SCR催化剂组合物从入口端朝向出口端设置在壁元件上,其长度小于衬底的轴向长度以形成入口区域。 第一衬底还具有分散在难熔金属氧化物上的具有铂族金属组分的NH 3破坏催化剂组合物。 NH 3破坏催化剂从出口端朝向入口端设置在壁元件上,其长度小于基板的轴向长度以形成出口区域。 通常,出口区域中铂族金属组分的含量为0.1至10g / ft 3。