| 摘要 |
PURPOSE:To improve the durability of the title catalyst by forming the noble metal-contg. refractory inorg. oxide obtained by depositing the noble metal on a small amt. of a refractory inorg. oxide at a high deposition rate into relatively large particles, and dispersing the particles in a refractory inorg. oxide layer. CONSTITUTION:A catalyst composition contg. the refractory inorg. oxide (a) deposited with 5-30wt.% platinum and 1-20wt.% rhodium in the form of the particles having 0.5-20mum means particle diameter is coated on a monolithic honeycomb carrier (e.g., cordierite monolithic carrier). From 1-20g of the refractory inorg. oxide (a) and 50-200g of the refractory inorg. oxide consisting of alumina, etc., are deposited on the carrier per liter of the carrier. The catalyst for purifying exhaust gas is capable of simultaneously removing hydrocarbons, carbon monoxide, and nitrogen oxides. The catalyst also has excellent durability, and exhibits high purification activity for the harmful components even in the case of used under severe conditions such as in a high- temp. oxidizing atmosphere. |
