Patent ID: 7754639
Filing Date: 2010-07-13
Classification: B01D,B01J

Abstract:
1. A method of producing a catalyst comprising a multi-element metal colloid solution, which colloid solution comprises, in a solvent, catalyst metal composed of one or more kinds of precious metals, a protective agent for protecting said catalyst metal, and a promoter metal composed of ions of at least one element selected from zirconium, cerium, iron, cobalt, nickel, molybdenum, and barium, the promoter metal being bonded to said protective agent, and the colloid solution is allowed to be attached to a support, thereby having the catalyst metal and the promoter metal carried on the support, comprising the steps of: preparing an aqueous solution of a salt of said catalyst metal, adding a polymeric protective agent to said aqueous solution, followed by a reduction treatment, to thereby form a catalyst metal colloid solution; further adding an aqueous solution of a salt of said promoter metal such that ions of the promoter metal bond to the protective agent, to thereby form a multi-element metal colloid solution; and having the multi-element metal colloid solution adhere to the support, to thereby have the catalyst metal and the promoter metal supported on the support, and wherein the protective agent is one member selected from polyallylamine, polyethyleneimine, poly(N-carboxymethyl)allylamine, poly(N,N- dicarboxymethyl)allylamine and poly(N-carboxymethyl)ethyleneimine.