Regeneration of inactive and poisoned platinum catalysts

Details Regeneration of inactive and poisoned platinum catalysts Regeneration of inactive and poisoned platinum catalysts

1986-03-03

1987-04-21

Konopka, P. E.

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Treating with a liquid or treating in a liquid phase,...

75108, 75121, 423 22, 423387, 502 27, 502185, 502516, B01J 2396, B01J 3868, C22B 1104, C01B 2114

Patent

active

046596836

ABSTRACT:
Noble metal catalyst, in particular platinum catalysts, which are applied on carriers and have become poisoned by metals as a result of being used for many years in the preparation of hydroxyl-ammonium salts by catalytic reduction of nitric oxide with hydrogen in an aqueous mineral acid are regenerated by a process in which the metallic impurities are dissolved using nitric acid or aqua regia, the solution is neutralized, the troublesome metals are precipitated from the neutralized solution by means of a selective precipitating reagent, and the purified platinum solution is reused for the preparation of the catalyst. Organic complexing agents which form insoluble or sparingly soluble complexes with the metallic impurities are preferably used as precipitating reagents.

REFERENCES:
patent: 2787540 (1957-04-01), Appell
patent: 3060133 (1962-10-01), Jockers et al.
patent: 3337555 (1967-08-01), Billman
patent: 4062927 (1977-12-01), De Rooij et al.

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