Nitrogen oxide purification system

Details Nitrogen oxide purification system Nitrogen oxide purification system

2005-11-10

2011-11-15

Nguyen, Cam N. (Department: 1736)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S304000, C502S326000, C502S327000, C502S328000, C502S332000, C502S333000, C502S334000, C502S339000, C422S170000, C422S171000, C422S177000, C422S180000

Reexamination Certificate

active

08058205

ABSTRACT:
An NOx purification system having NOx occlusion reduction-type catalysts including an occlusion material and a metal catalyst, which occludes NOx in a lean state in terms of a fuel-air ratio of an exhaust gas and releases the occluded NOx in a rich state. A high-temperature type catalyst is placed on the upstream side, and a low-temperature type catalyst is disposed on the downstream side in series with the high-temperature type catalyst. The molar ratio of platinum to rhodium supported on the high-temperature type catalyst is within a range of 2:1 to 1:2. This NOx purification system is capable of a wide NOx activation temperature window.

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