Catalyst for purifying exhaust gas and method for purifying exha

Details Catalyst for purifying exhaust gas and method for purifying exha Catalyst for purifying exhaust gas and method for purifying exha

1994-07-11

1996-05-21

Bell, Mark L.

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

Zeolite or clay, including gallium analogs

And additional al or si containing component

502 71, 502 74, 502 77, 423713, B01J 29064, C01B 3906

Patent

active

055189768

ABSTRACT:
A catalyst for purifying exhaust gas comprising crystalline iridium silicate having a Si/Ir atomic ratio of 50 to 800 and a Si/Al atomic ratio of not less than 15. The catalyst exhibits excellent activity and selectivity when used for purification of, and specifically for eliminating NOx from, an exhaust gas which contains reducing components including hydrocarbons, oxygen in excess of the stoichiometric quantity necessary for completely oxidizing all of the reducing components, and nitrogen oxides. The catalyst is highly durable to hydrothermal aging.

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Mitsubishi Heavy Ind., Patent Abstracts of Japan, vol. 16, No. 1 (C-0899) 7 Jan. 1992 JP-A-03 229 620.

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