Method for regenerating platinum catalysts

Details Method for regenerating platinum catalysts Method for regenerating platinum catalysts

2007-12-18

2007-12-18

Johnson, Edward M. (Department: 1754)

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,...

Reexamination Certificate

active

10030224

ABSTRACT:
The regeneration of platinum group metal suspension catalysts involves a dissolution step using HCl and an oxidant, such as Cl2or H2O2, and a precipitating step carried out in the presence of a reducing agent, especially an aldehyde, an HCOOH or a formiate. According to the invention, the content of non-platinum metals which are dragged into the catalyst as a result of the method can be reduced by carrying out the precipitation in the presence of a chelate complexing agent for one or more metals selected from the series of metals of groups 2a, 3a, 4a of the periodic table and of the transition elements without elements of the platinum group.

REFERENCES:
patent: 5279802 (1994-01-01), Clough
patent: 5279803 (1994-01-01), Clough
patent: 5280004 (1994-01-01), Iino et al.
patent: 0 611 126 (1998-11-01), None
patent: 922 021 (1963-03-01), None
patent: 975 730 (1964-09-01), None
patent: 1 090 294 (1967-09-01), None
English translation of International Preliminary Examination Report (Form PCT/IPEA/409).

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