Adsorbent for nitrogen oxides and exhaust emission control catal

Details Adsorbent for nitrogen oxides and exhaust emission control catal Adsorbent for nitrogen oxides and exhaust emission control catal

1996-12-11

1998-09-08

Caldarola, Glenn

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502 64, 502 65, 502 66, 502302, 502303, 502525, B01F 2310, B01F 29068, B01F 2944

Patent

active

058045260

ABSTRACT:
An adsorbent exhibiting an excellent adsorption ability to nitrogen oxides (NO) is made from an oxide-based ceramics having an average crystallite grain size D in a range of D<500 .ANG., e.g., CeO.sub.2. A catalyst is formed from, for example, an cerium oxide (CeO.sub.2) and a zeolite. A content C of CeO.sub.2 in the catalyst is set in a range of 10% by weight .ltoreq.CA.ltoreq.80% by weight. The zeolite adsorbs hydrocarbon (HC). The hydrocarbon (HC) adsorbed is oxidized into active CHO which acts to reduce the nitrogen oxides (NO) adsorbed by the CeO.sub.2.

REFERENCES:
patent: 4791091 (1988-12-01), Bricker
patent: 4849398 (1989-07-01), Takada et al.
patent: 5164350 (1992-11-01), Abe et al.

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