Catalyst for the purification of effluent gases containing oxide

Details Catalyst for the purification of effluent gases containing oxide Catalyst for the purification of effluent gases containing oxide

1976-01-30

1978-01-31

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252462, 423239, B01J 2104, B01J 2112, B01J 2310, B01J 2374

Patent

active

040714721

ABSTRACT:
The invention relates to the purification of gaseous effluents containing ides 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 m.sup.2 /g and pores having a maximum dimension between 100 and 5000 A.
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.

REFERENCES:
patent: 3483138 (1969-12-01), Stephens
patent: 3615166 (1971-10-01), Hindin et al.
patent: 3857921 (1974-12-01), Tamura et al.
patent: 3956188 (1976-05-01), Hindin et al.

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