| 摘要 |
<p>PURPOSE:To obtain a catalyst for burning and removing fine carbonaceous particles in exhaust gas of an diesel engine, by dispersing and supporting copper, Na and platinum or the like by a porous inorg. substrate supported by a refractory three-dimensional structure before heat treatment. CONSTITUTION:A compound (a) containing at least one metal selected from a group consisting of copper, Mn, Mo, lead, iron, Co, V and Ag, a compound (b) containing at least one metal selected from a group consisting of Na, K and Cs and, further, a compound (c) containing at least one metal selected from a group consisting of platinum, Rh and Pd are dispersed in and supported by a porous inorg. substrate such as alumina supported by a refractory three-dimentional structure having gas filter function such as ceramic foam and heat treated at 700-1,000 deg.C. As a result, the title catalyst, wherein combustion behavior of fine particles is good in an engine exhaust gas temp. range and the rising in pressure loss is slow as well as combustion regeneration is rapidly generated from the catalyst reaches a predetermined exhaust gas temp., is obtained.</p> |
