| 摘要 |
PURPOSE:To increase the gas purifying degree and durability of the titled catalyst by mixing activated alumina having specified narrow pore diameter with alumina sol, crushing the mixture to make slurry and forming an aluminum oxide coating on the surface of a catalyst. CONSTITUTION:Activated alumina contg. cerium preliminarily wherein >=80% all narrow pore volume is occupied by the narrow pore volume of 200-600Angstrom narrow pore diameter is mixed with cerium oxide and alumina sol and the mixture is crushed and the obtained slurry is impregnated into an integral structure type carrier, dried and calcined and thereafter the essential catalytic metals are deposited on the composite oxide coating formed on the carrier. Separately, after the slurry of mixed and crushed material of both alumina wherein >=80% all narrow pore volume is occupied by the narrow pore volume of 200-600Angstrom narrow pore diameter and alumina sol is coated on the carrier deposited with the above-mentioned essential catalytic metals, it is dried, calcined to manufacture the waste gas purifying catalyst for removing carbon monoxide, hydrocarbons and nitrogen oxides contained in the waste gas. |
