Method for regenerating platinum group metal suspension...

B - Operations – Transporting – 01 – J

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B01J 23/96 (2006.01)

Patent

CA 2381940

The regeneration of platinum group metal suspension catalysts involves a dissolution step using HC1 and an oxidant, such as Cl2 or 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.

L'invention concerne un procédé de régénération de catalyseurs en suspension à base de métaux de groupes platiniques, qui comprend une étape de dissolution avec du HCl et un agent d'oxydation, tel que Cl2 ou H2O2, et une étape de précipitation en présence d'un agent de réduction, notamment un aldéhyde, HCOOH ou du formiate. Selon l'invention, la teneur en métaux non platiniques entraînés dans le catalyseur de manière inhérente au procédé peut être réduite du fait que la précipitation intervient en présence d'un agent complexant chélaté pour un ou plusieurs métaux de la série des métaux des groupes 2a,3a,4a de la classification périodique des éléments, ainsi que des éléments de transition sans éléments du groupe platine.

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