Process for preparing noble metal catalysts

Details Process for preparing noble metal catalysts Process for preparing noble metal catalysts

B - Operations, Transporting

01

J

252/89

B01J 23/40 (2006.01) B01J 21/18 (2006.01) C01B 21/14 (2006.01) C10G 35/09 (2006.01)

Patent

CA 1071617

ABSTRACT OF THE DISCLOSURE The invention relates to a process for preparing active noble-metal catalysts on a carbon carrier. In particular, the process comprises adsorbing a soluble salt of the catalytically active metal onto the carbon in an aqueous medium; hydrolyzing said salt to the oxide or hydroxide, by employing a basic reagent; and reducing said oxide or hydroxide to the metal. The porous carbon contains macro- pores of radius above 103 A, intermediate pores of radius between 20 and 103 A and micropores of radius not greater than 20 A, and the ratio between the pore volumes of the macro pores plus the intermediate pores and the total pore volume is between 0.6 and 1.0; and the hydrolysis of the noble metal salt and the reduction of the oxide or hydroxide formed thereby are carried out in a single processing step using liquid hydrolyzing and reducing agents. The inventive process is relatively simple and avoids the formation of coarse metal crystallites.

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