| 摘要 |
PURPOSE:To improve the catalytic activity of a titled catalyst by coating a mixed slurry of a granular catalyst deposited a novel metal dispersively, a metallic oxide powder and an aq. soln. of nitric acid on an inorganic granular carrier composed essentially of activated alumina. CONSTITUTION:After an inorganic granular carrier composed essentially of activated alumina is impregnated by an impregnating method into the acidic aq. soln. of nitric acid of a novel metal such as platinum and rhodium by using the aq. soln. of nitirc acid by such amount that the pH of said soln. is regulated to <=1.0, the novel metal is fixed into said granular carrier in the form of a sulfide by using the aq. soln. of sodium thiosulfate and the carrier is dried and calcined at the temperature of 550 deg.C. A rare earth metallic nitrate and rare earth metallic oxide are added to said granular catalyst and the mixture is crushed and kneaded together with the aq. soln. of nitric acid by usig a pot mill or the like to obtain the slurry. Said slurry is coated on cordierite-one body type carrier composed essentially of silica, alumina and magnesia, and the carrier is dried and calcined. |
