Process for regenerating catalyst

Details Process for regenerating catalyst Process for regenerating catalyst

1976-03-01

1978-01-24

Douglas, Winston A.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

423239, B01J 2394, B01J 2392, C01B 2102, B01D 5334

Patent

active

040703053

ABSTRACT:
Catalyst for removing nitrogen oxides, whose activity is lowered by poisoning with sulfur oxides, is contacted with an ammonia gas at a temperature of 200.degree. to 500.degree. C, whereby the sulfur oxides are liberated from the catalyst, and the catalyst is regenerated.
Concentration of the ammonia gas to be used in the regeneration treatment must be at least 1% by volume and preferably 5 to 50% by volume of ammonia is used in a mixture with other inert diluting gas. The regenerated catalyst is given an activity as high as that before the poisoning without bringing about any damage and cracking to the catalyst.

REFERENCES:
patent: 2747968 (1956-05-01), Pigache
patent: 3449063 (1969-06-01), Gri ffing et al.
patent: 3501897 (1970-03-01), Van Helden et al.
patent: 3864451 (1975-02-01), Lee et al.
patent: 3914390 (1975-10-01), Kudo et al.
The Catalytic Chemistry of Nitrogen Oxides, R. L. Klimisch & J. G. Larson, Plenum Press, N. Y. 1975, pp. 133-150.

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