| 摘要 |
1,203,953. Noble metal catalysts. FARBENFABRIKEN BAYER A.G. and FARBWERKE HOECHST A.G. 13 Nov., 1967 [2 March, 1967], No. 51545/67. Heading B1E. [Also in Division C2] A carrier catalyst containing metallic palladium, metallic gold and an alkali metal or alkaline-earth metal carboxylate is prepared by impregnating a carrier such as silicic acid, kieselguhr, silica gel, diatomaceous earth, aluminium oxide, aluminium silicate or phosphate, pumice stone, silicon carbide, asbestos or active charcoal with an aqueous solution of a palladium salt such as PdCl 2 , Pd(NO 3 ) 2 or Pd(CH 3 COO) 2 , and a gold salt e.g. AnCl 3 or chloroauric acid HAnCl 4 . H 2 O and reducing the dried mass with a reducing agent such as hydrazine hydrate, alkali formate/formic acid, sodium boranate, hydroquinone or hydrogen, and impregnating the washed mass with a 10% alkali metal or alkaline earth metal carboxylate solution. |
