| 摘要 |
Catalytic composite comprises (a) a Pt Gp. metal component, (b) as modifier metal component, a Sn, Ge or Re component or mixts. of these, and (c) a refractory support of nominal dia. at least about 850 microns; components (a) and (b) being surface-impregnated so that their average concns. in the outside 100 micron layer of the catalyst particle are each at least twice their respective concns. in the 200 micron dia. centre core of the particle. |
