Process for the reduction of activated chromium oxide catalyst

Details Process for the reduction of activated chromium oxide catalyst Process for the reduction of activated chromium oxide catalyst

2005-04-21

2008-08-05

Barry, Chester T (Department: 1797)

Liquid purification or separation

Processes

Chemical treatment

Reexamination Certificate

active

07407591

ABSTRACT:
Process for the reduction of a hexavalent chromium oxide based catalyst comprising contacting, under mixing conditions, a hexavalent chromium oxide based catalyst, with a molar excess, in respect of the chromium species, of a solid reducing agent and subjecting the mixture to a temperature in the range 30-1000° C. The process is simple, involves low costs and allows to obtain a permanently reduced chromium catalyst that can be disposed without toxicity risks.

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T. Wang et al., “High-temperature reduction of chromium (VI) in solid alkali,”Journal of Hazardous Materials B112, p. 63-69 (2004) XP002348346.

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