Close coupled catalyst with a SOx trap and methods of making and using the same
    1.
    发明申请
    Close coupled catalyst with a SOx trap and methods of making and using the same 审中-公开
    具有SOx阱的密闭耦合催化剂及其制备和使用方法

    公开(公告)号:US20030039597A1

    公开(公告)日:2003-02-27

    申请号:US09938448

    申请日:2001-08-24

    Abstract: The present invention relates to an article comprising a catalyst composition and a method useful for the removal of NOx and SOx contaminants from a gaseous stream, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with catalysts of the type generally referred to as nullclose coupled catalystsnull which are designed to reduce pollutants in engine exhaust emissions during engine cold start conditions. The article comprises a lean burn gasoline engine having an exhaust outlet, an upstream section having a close coupled catalyst composite in communication with the exhaust outlet, and a downstream section. The upstream close coupled catalyst composite comprises a first support; a first platinum group component; and a SOx sorbent component selected from the group consisting of oxides and mixed oxides of barium, lanthanum, magnesium, manganese, neodymium, praseodymium, and strontium. The downstream section comprises a second support; a second platinum group component; and a NOx sorbent component. The upstream section has substantially no components adversely affecting three-way conversion under operating conditions.

    Abstract translation: 本发明涉及包含催化剂组合物和可用于从气流,特别是含有硫氧化物污染物的气态物流中除去NOx和SO x污染物的方法的制品。 更具体地,本发明涉及通常称为“紧密耦合的催化剂”的催化剂,其被设计为在发动机冷起动条件期间减少发动机废气排放物中的污染物。 该制品包括具有排气出口的稀燃汽油发动机,具有与排气出口连通的紧密耦合的催化剂复合材料的上游部分和下游部分。 上游紧耦合催化剂复合材料包括第一载体; 第一铂族组分; 和选自钡,镧,镁,锰,钕,镨和锶的氧化物和混合氧化物的SOx吸附剂组分。 下游部分包括第二支撑件; 第二铂族组分; 和NOx吸附剂组分。 上游部分基本上没有在操作条件下不利地影响三路转换的部件。

    Enhanced NOx trap having increased durability
    2.
    发明申请
    Enhanced NOx trap having increased durability 失效
    增强的NOx捕集器具有增加的耐久性

    公开(公告)号:US20030045424A1

    公开(公告)日:2003-03-06

    申请号:US09933586

    申请日:2001-08-21

    Abstract: A catalytic trap disposed in an exhaust passage of an internal combustion engine which is operated with periodic alternations between lean and stoichiometric or rich conditions, for abatement of NOx in an exhaust gas stream which is generated by the engine. The trap comprises a catalytic trap material and a refractory carrier member on which the catalytic trap material is disposed. The catalytic trap material comprises: (i) a refractory metal oxide support; (ii) a catalytic component effective for promoting the reduction of NOx under stoichiometric or rich conditions; and (iii) a NOx sorbent effective for adsorbing the NOx under lean conditions and desorbing and reducing the NOx to nitrogen under stoichiometric or rich conditions. The NOx sorbent comprises a metal oxide selected from the group consisting of one or alkali metal oxides, alkaline earth metal oxides and mixtures of one or more alkali metal oxides and alkaline earth metal oxides. The manganese component is selected from the group consisting of: (1) a manganese oxide, (2) a mixed oxide of manganese and a transition metal and/or a rare earth metal, (3) a compound of an alkali metal and a manganese oxide, (4) a compound of an alkaline earth metal and a manganese oxide and (5) mixtures of the foregoing oxides and compounds.

    Abstract translation: 设置在内燃机的排气通道中的催化捕集器,其在稀薄和化学计量或富含条件之间的周期性变化下操作,以减少由发动机产生的废气流中的NOx。 捕集器包括催化捕集材料和其上设置有催化捕集材料的耐火载体构件。 催化捕集材料包括:(i)难熔金属氧化物载体; (ii)在化学计量或富含条件下有效促进NOx还原的催化组分; 和(iii)有效地在稀薄条件下吸附NOx的NOx吸附剂,并且在化学计量或富含条件下将NOx解吸并还原成氮。 NOx吸附剂包括选自一种或碱金属氧化物,碱土金属氧化物和一种或多种碱金属氧化物和碱土金属氧化物的混合物的金属氧化物。 锰成分选自:(1)锰氧化物,(2)锰与过渡金属和/或稀土金属的混合氧化物,(3)碱金属和锰的化合物 氧化物,(4)碱土金属和氧化锰的化合物和(5)上述氧化物和化合物的混合物。

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