Basf Aktiengesellschaft

Werner Steigleiter

Franz-Josef Weiss

Wolfgang Hoelderich

Hugo Fuchs

Josef Ritz

Gerald Neubauer

Luc Guns

Heinz Engelbach

Werner Biffar

Helmut Glietenberg

A platinum-on-graphite catalyst having a platinum content of from 0.01 to 5% w/w, wherein the graphite support has an apparent density of from 1.7 to 2.2 g/ml and the use thereof as a hydrogenation catalyst.

Platinum-on-graphite catalysts

A platinum-on-graphite catalyst having a platinum content of from 0.01 to 5% w/w, wherein the graphite support has a particle size of from 1 to 600 .mu.m and the following particle size distribution:

Platinum-on-graphite catalysts and the use thereof

Hydroxylammonium salts are prepared by catalytic reduction of nitrogen monoxide with hydrogen in dilute aqueous mineral acids at elevated temperature in the presence of suspended supported platinum catalysts obtainable by precipitating metallic platinum from aqueous solutions of platinum salts onto carriers suspended therein by means of reducing agents in the presence of one or more water-soluble substituted or unsubstituted thioureas.

Preparation of hydroxylammonium salts

Catalysts, for olefin oligomerization, whose active material has the empirical formula I

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Werner Steigleiter