Catalytic composition used in purifying gaseous effluents pollut

Details Catalytic composition used in purifying gaseous effluents pollut Catalytic composition used in purifying gaseous effluents pollut

1978-12-27

1980-10-14

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252464, 252465, 423239, B01J 2104, B01J 2310, B01J 2384, B01J 2386

Patent

active

042280397

ABSTRACT:
Gaseous effluents polluted by nitrogen oxides are purified by catalytic reduction. The catalytic compositions used contain iron and chromium associated with alumina and optionally at least a promoter selected from rare earth oxides with a content between 0.1 and 1% in relation to the active material and crude platinum metals with a content between 1 and 5 ppm in relation to the active material, the specific surface of the compositions being between 50 and 300 m.sup.2 /g and the dimensions of the pores between 40 and 50,000 A. These compositions are applicable for processes of purification of nitrogen oxides with any content.

REFERENCES:
patent: 3857921 (1974-12-01), Tamura et al.
patent: 4029738 (1977-06-01), Courty et al.
patent: 4071472 (1978-01-01), Senes et al.

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