| 摘要 |
PURPOSE:To minimize the deterioration of a catalyst metal by poisoning by laminating at least >=2 layers of carriers formed by laminating activated alumina layers on activated alumina layers contg. catalyst components, thereby forming a catalyst for cleaning exhaust gases. CONSTITUTION:Respectively at least >=2 layers of the activated alumina layers contg. the catalyst components and the activated alumina layers are laminated on a refractory honeycomb base body consisting of an inorg. material to form the catalyst for cleaning exhaust gases. A monolithic catalyst carrier essentially of cordierite is generally used for the refractory honeycomb base body. The activated alumina layers contg. the catalyst components is obtd. by coating a slurry prepd. by mixing and grinding the activated alumina preliminarily deposited with platinum, rhodium, palladium and rare earths and bainite alumina sol and if necessary, rare earth oxide on the above-mentioned base body. |
