NO x absorbent and absorption reduction-type NO x...

Details NO x absorbent and absorption reduction-type NO x... NO x absorbent and absorption reduction-type NO x...

2006-07-25

2006-07-25

Nguyen, Cam N (Department: 1754)

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S349000, C502S327000, C502S328000, C502S333000, C502S334000, C502S339000, C502S415000, C502S439000

Reexamination Certificate

active

07081431

ABSTRACT:
An exhaust gas purifying catalyst capable of exerting excellent NOxpurifying capability even at high exhaust gas temperatures, exceeding 500° C., is provided.The catalyst is an absorption reduction-type NOxpurifying catalyst comprising an NOxabsorbent obtained by loading at least one alkali metal or alkaline earth metal on a crystalline ZrO2composite oxide having added thereto at least one trivalent rare earth metal or divalent alkaline earth metal. Preferably, aluminum is further supported on the ZrO2composite oxide. The NOxabsorbent is considered to have an NOxabsorption mechanism that an electron released from the alkali metal or the like enters into an oxygen vacancy part of the crystalline ZrO2and this oxygen vacancy part functions as a strong base site for donating an electron to an electrophilic component such as NOx.

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