| abstract |
Catalysts comprising in combination (a) metallic copper or a copper compound, (b) metallic molybdenum, metallic vanadium, a molybdenum compound or a vanadium compound, and (c) an alkali metal compound allow particulates in exhaust gases of Diesel engines to be burned at a relatively low temperature. For use, the catalyst is supported on a heat resistant particulate trap which is preferably coated with a carrier of titania, y-alumina or silica-alumina, and then with the catalyst. Further enhanced catalytic activity is obtained when catalysts comprising components (a), (b), and (c) are combined with (d) metallic platinum, palladium or rhodium or its compound. |