Exhaust gas purifying catalyst and exhaust gas purifying process

Details Exhaust gas purifying catalyst and exhaust gas purifying process Exhaust gas purifying catalyst and exhaust gas purifying process

1991-04-03

1992-10-13

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

4232132, 4232451, 4232453, B01J 800, B01J 802, C01B 2100, C10H 2300

Patent

active

051549026

ABSTRACT:
An exhaust gas purifying catalyst of this invention is a catalyst for mainly removing nitrogen oxides contained in exhaust gases, comprising: crystalline copper silicate expressed by the following composition formula;
M.sub.n+m (Cu.sub.n Al.sub.m Si.sub.96-n-m O.sub.192).16H.sub.2 O, where M denotes one of sodium (Na) and potassium (K), and n+m<27. An exhaust gas purifying process of this invention employs the above-mentioned crystalline copper silicate catalyst. The exhaust gas purifying catalyst and the exhaust gas purifying process employing the same purify the nitrogen oxides (NOx) by facilitating the reaction between hydrocarbons (HC) and nitrogen oxides (NOx) contained in the exhaust gases more preferentially than the reaction between hydrocarbons (HC) and oxygen (O.sub.2) contained therein, thereby purifying the nitrogen oxides (NOx) and hydrocarbons (HC) at high efficiency.

REFERENCES:
patent: 4170571 (1979-10-01), Ritscher
patent: 4297328 (1981-10-01), Ritscher et al.
patent: 4331644 (1982-05-01), Ritscher

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