CATALYST FOR SELECTIVE HYDROGENATION OF AROMATIC HALONITRO COMPOUND TO AROMATIC HALOAMINES AND PROCESS FOR ITS PRODUCTION

摘要

PURPOSE: A catalyst for the hydrogenation of aromatic halonitro compounds to form aromatic haloamines which would be distinguished from the known catalysts by a low noble metal demand and by improved activity and selectivity is provided, and a process for the production of this catalyst is provided. CONSTITUTION: The modified noble metal supported catalyst for the selective hydrogenation of aromatic halonitro compounds and to form aromatic haloamines comprises an active carbon support having specific surface area of greater than 500 m¬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 the active carbon support, and the ratio by weight between the platinum and the copper simultaneously present is 5:1 to 20:1, and the platinum and copper are present in fine distribution on the active carbon support. The 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¬2/g suspended in water with a water soluble compound of platinum and a water soluble compound of copper, precipitating the compounds from aqueous solutions of readily soluble compounds thereof, and reducing the catalyst, wherein the precipitating and reducing are at a temperature of from 70 to 100 deg.C.