| 摘要 |
1474553 Exhaust gas purification catalysts W R GRACE & CO 17 April 1974 [18 April 1973] 16832/74 Heading B1E [Also in Divisions B5, Cl and F2] A catalyst comprises an extruded ceramic tube having a plurality of reinforcing ribs extending lengthwise and each spanning the tube so that each rib intersects another which has been sintered to form a microporous structure (see Division B5) and a coating comprising alumina and 5-20% ceria and catalytic components, typically Pt and Pd in a ratio of 1:1 to 1:3. The amount of the coating is suitably 5-10% based on the weight of the suport and contains 0.02-0.05% catalytic components. The ceramic may be cordierite, mullite, alumina or spinel. |
