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    • 8. 发明授权
    • Enhanced NOx trap having increased durability
    • 增强的NOx捕集器具有增加的耐久性
    • US06727202B2
    • 2004-04-27
    • US09933586
    • 2001-08-21
    • Michel DeebaShau-Lin F. ChenJohn K. HochmuthPatrick L. BurkXinyi Wei
    • Michel DeebaShau-Lin F. ChenJohn K. HochmuthPatrick L. BurkXinyi Wei
    • B01J3702
    • F01N3/0842B01D53/9431B01J23/34B01J23/6562B01J23/92B01J37/0201B01J37/0242B01J37/0248F01N3/0814F01N2250/12F01N2370/02F01N2370/22Y02C20/10Y02T10/24
    • 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.
    • 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。