Degussa Aktiengesellschaft

Degussa - Huls Ag

Degussa-huels Aktiengesellschaft

Barbara Bender

Monika Berweiler

Daniel Ostgard

Konrad Moebus

Gernot Stein

Andreas Freund

Bernd Kempf

In the overall methods of hydrogenating esters and maleic anhydride, which methods comprise a hydration reaction, comprising conducting the hydration reaction in the presence of the shaped Raney metal fixed-bed catalysts of the invention.

Fixed bed catalysts

A shaped, activated, fixed-bed Raney metal catalyst prepared by a method comprising preparing a mixture of powders comprising at least one catalyst alloy of (1) at least one catalytically active Raney process metal, a leachable alloy component and optionally a promoter, (2) at least one binder containing at least one pure Raney metal and (3) a moistening agent. Shaping, calcining and activating said catalyst and doping said catalyst with rhenium.

A shaped, activated metal, fixed-bed catalyst with a pore volume of 0.05 to 1 ml/g and an outer activated layer consisting of a sintered, finely-divided, catalyst alloy and optionally promoters. The catalyst alloy has metallurgical phase domains, resulting from the method of preparation of the alloy, in which the largest phase by volume has a specific interface density of more than 0.5 &mgr;m,.

Shaped, activated metal, fixed-bed catalyst

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Rodenbach, Germany

Barbara Bender