Purification of effluent gases containing oxides of nitrogen...

Details Purification of effluent gases containing oxides of nitrogen... Purification of effluent gases containing oxides of nitrogen...

B - Operations, Transporting

01

J

23/353, 252/48,

B01J 23/10 (2006.01) B01D 53/34 (2006.01) B01D 53/86 (2006.01) B01J 23/74 (2006.01) B01J 23/89 (2006.01) B01J 35/10 (2006.01)

Patent

CA 1060875

ABSTRACT The invention relates to the purification of gaseous effluents containing oxides of nitrogen by reduction of said oxides in the presence of a catalyst at raised temperatures. The catalysts used in this process contain iron as a major constituent, and may contain chromium or vanadium: these constitute 96 to 99.5% of the weight of the catalyst. Also present as promoters, in a total amount of 4.0 to 0.5% by weight of the catalyst, are one or more rare earth metal oxides and a trace quantity of a platinum metal. The catalyst is prepared by a method which ensures a specific surface of 20-100 m2/g and pores having a maxim?? dimension between 100 and 5000 ?. Such a catalyst is particularly suitable for removing residual oxides of nitrogen from the gaseous effluent obtained in the production of nitric acid by the oxidation of ammonia.

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