No.sub.x removal catalyst and method of purifying exhaust gas by

Details No.sub.x removal catalyst and method of purifying exhaust gas by No.sub.x removal catalyst and method of purifying exhaust gas by

1994-12-19

1996-09-24

Straub, Gary P.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

B01J 2348

Patent

active

055590721

ABSTRACT:
A NO.sub.x removal catalyst resistant to high temperatures, comprising an activated alumina wherein the specific surface area measured by the nitrogen adsorption method is 120 m.sup.2 /g or more, the bulk density measured by the mercury porosimetry is 0.60 g/cm.sup.3 or more, and the skeleton density measured by the mercury porosimetry is 1.80 g/cm.sup.3 or less and silver carried on said activated alumina. When said catalyst or a structure having said catalyst coated on a substrate is brought in contact with exhaust gas from an internal combustion engine that is operated at a lean fuel/air ratio, such as a lean-burn engine, NO.sub.x can be removed efficiently within a quite short contact time.

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patent: 4650782 (1987-03-01), Onal
T. Miyadera, Applied Catalysis B: Environmental, 2,(2), 199-205 (1993) Jun.
W. Gerhartz et al., Ullmann's Encyclopedia of Industrial Chemistry, Vol. A1, Edition 5, pp. 588-592 (1985). (no month).

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