Exhaust gas purification catalyst

Details Exhaust gas purification catalyst Exhaust gas purification catalyst

2007-05-22

2007-05-22

Nguyen, Cam N. (Department: 1754)

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S302000, C502S303000, C502S304000, C502S328000, C502S330000, C502S332000, C502S333000, C502S334000, C502S339000, C502S349000, C502S350000, C502S351000, C502S355000, C502S415000, C502S439000, C502S527120, C502S527130

Reexamination Certificate

active

10468354

ABSTRACT:
A noble metal and an NOxsorption member are loaded on a support which includes composite particles having a structure including a core portion in which ZrO2is a major component and a superficial portion formed on a surface of the core portion and including an oxide, whose basicity is lower than ZrO2, more than the core portion. The composite particles exhibit a high basicity at the inside and a low basicity on the surface by Al2O3or TiO2which exists more in the surface. Accordingly, the sulfur-poisoning resistance is improved, and, at the same time, the post-durability NOxpurifying ability is improved.

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