Catalyst for the selective hydrogenation of aromatic halonitro compounds to aromatic haloamines and a process for its production
AssigneeDegussa AG
InventorsKlaus Deller, Bertrand Despeyroux, Erik Peldszus, Beate Kleinwaechter
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Abstract
A modified supported noble metal catalyst is disclosed for the selective hydrogenation of aromatic halonitro compounds to form aromatic haloamines. The support consists of active carbon. The active component is platinum modified with copper. The new catalyst is distinguished by good selectivity and a high yield.
Claims20
A modified noble metal supported catalyst for the selective hydrogenation of aromatic halonitro compounds and to form aromatic haloamines comprising an active carbon support having specific surface area of greater than 500 m.sup.2 /g, platinum as the catalytically active component and copper as modifier, wherein platinum is present in a quantity of 0.1 to 5.0% by weight based on said active carbon support, and the ratio by weight between said platinum and said copper simultaneously present is 5:1 to 20:1, and said platinum and copper are present in fine distribution on said active carbon support.
A process for the production of a supported noble metal catalyst comprising impregnating an active carbon support having a specific surface area of greater than 500 m.sup.2 /g suspended in water with a water soluble compound of platinum and a water soluble compound of copper, precipitating said compounds from aqueous solutions of readily soluble compounds thereof, and reducing the catalyst;
- wherein said precipitating and reducing are at a temperature of from 70.degree. to 100.degree. C.
A modified noble metal catalyst made by a process consisting essentially of impregnating an active carbon support suspended in water with a water soluble compound of platinum and a water soluble compound of copper, precipitating said compounds from aqueous solutions of readily soluble compounds thereof, reducing the catalyst, and optionally filtering and washing the catalyst;
- wherein said precipitating and reducing are at a temperature of from 70.degree.to 100.degree. C.
Dependencies are inferred from the claim text.