Platinum-bismuth catalysts for treating engine exhaust

Details Platinum-bismuth catalysts for treating engine exhaust Platinum-bismuth catalysts for treating engine exhaust

2007-01-09

2009-10-20

Nguyen, Cam N (Department: 1793)

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S303000, C502S332000, C502S334000, C502S339000, C502S354000, C502S355000, C502S415000, C502S439000

Reexamination Certificate

active

07605109

ABSTRACT:
An engine exhaust catalyst containing precious metal nanoparticles is promoted with bismuth. The bismuth promotion improves the catalyst's CO oxidation performance. Also, by varying the amount of bismuth that is added, the NO conversion rate that can be realized with the catalyst can be controlled. The control over the NO conversion rate is important because the passive regenerative performance of a particulate filter used in engine exhaust systems is based on the amount NO2that is present in the exhaust stream that reaches the particulate filter. The amount of NO2being produced needs to be optimized (not necessarily maximized) so that adequate particulate filter regeneration performance can be maintained while avoiding unused, toxic NO2from being exhausted into the atmosphere.

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