2764. REITLINGER, O. Catalytic Contact Masses. British Patent 640,455; appl. filed Feb. 20, 1947. British Abs., 1950, B, I, p. 1013.

Oxidation catalyst suitable for use at atmospheric pressure and relatively high-space velocities is prepared by applying a metal bonding substance (Fe₂O₃) to a preferably porous carrier (nonmetal, metal without reducing action on the catalyst, or powdered catalyst), drying in air or O₂ and HCI at 200°-750° and giving a number of coats of a powdered catalyst, for example, Mn₂O₃, Cr₂O₃ (Fe₂O₃), in the presence of H₂O and/or an organic liquid (limited to the amount completely adsorbed by the metal bonding substance without affecting packing of the powder) until the carrier is completely covered by layers of firmly held catalyst. Examples are given, including one of similarly prepared Fischer-Tropsch catalysts showing markedly increased activity at atmospheric pressure.