Method of removing nitrogen oxides from exhaust gas mixtures

Details Method of removing nitrogen oxides from exhaust gas mixtures Method of removing nitrogen oxides from exhaust gas mixtures

1978-08-21

1980-03-04

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423212, B01D 5334

Patent

active

041917308

ABSTRACT:
A method of removing nitrogen oxides (NO.sub.x) from exhaust gas mixtures is described. The removal of NO.sub.x from exhaust gas mixtures is accomplished by exposing the exhaust gas mixture, in a manner that does not substantially impede the gas flow, to a ceramic material containing from about 75% to about 95% by weight silicon carbide and from about 0.3% to about 10.0% silica. A reduction of at least 85% of NO.sub.x from the mixture is to be expected and reductions up to 95 to 100% are attainable. Ceramic mixtures containing silicon nitride in amounts between about 10% and about 30% are found to reduce the amount of NO.sub.x in exhaust gases at temperatures as low as 200.degree. C.

REFERENCES:
patent: 3459494 (1969-08-01), Harris et al.
patent: 3816595 (1974-06-01), LaHaye et al.
Hightower, J. W. et al. in The Catalytic Chemistry of Nitrogen Oxides; Plenum Press, N.Y., 1975, pp. 63-87.
Yuan et al.; "J. Phys. Chem."; vol. 63; 1959.

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