Exhaust gas purifying catalyst

Details Exhaust gas purifying catalyst Exhaust gas purifying catalyst

1993-08-23

1995-06-06

Pal, Asok

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

Zeolite or clay, including gallium analogs

4232132, 4232392, B01J 2904

Patent

active

054223334

ABSTRACT:
An exhaust gas purification catalyst of high resistance which allows highly effective purification of nitric oxide into nontoxic gas, even for an exhaust gas containing oxygen at a high concentration. A carrier of the catalyst includes crystalline pentasil-type aluminosilicate and supports copper and phosphori, the amount of the phosphori being supported ranges from 0.01% to 6.0% by weight as a conversion to P.sub.2 O.sub.5, and ratio of the phosphorus to the copper, i.e., P/Cu (molar ratio) is in 0<(P/Cu).ltoreq.0.7. A method of reducing and eliminating a nitrogen oxide in an exhaust gas in the presence of a hydrocarbon having a ratio of an overall THC concentration/NO.sub.x concentration of 0.5-50 at a reaction temperature of 200.degree.-800.degree. C. in an oxidative atmosphere.

REFERENCES:
patent: 3346328 (1967-10-01), Sergeys et al.
patent: 3354096 (1967-11-01), Young
patent: 4122039 (1978-10-01), Kobylinski et al.
patent: 4867954 (1989-09-01), Staniulis et al.
patent: 5017538 (1991-05-01), Takeshima
patent: 5024981 (1991-06-01), Speronello et al.

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