| 摘要 |
PURPOSE:To enhance catalytic effect and to improve catalytic activity, by applying a catalytically active substance containing at least one platinum group element selected from Pt, Rh and Pd to the gas contact surface or gas contact part of a refractory three-dimensional structure so as to form projections. CONSTITUTION:An activated alumina pellet is impregnated with an aqueous solution containing a water-soluble salt to one or more of a catalytically active component comprising a platinum group element selected from Pt, Rh and Pd to support said component and the impregnated pellet is dried, baked and subsequently ground by a hammer mill to obtain a catalytically active substance supported powder which is, in turn, thrown in an aqueous solution containing a dispersant to prepare a slurry under stirring. This slurry is infiltrated in a three-dimensional structure and the excessive slurry is subsequently removed from said three-dimensional structure to form a largely depressed and protruded projection-like catalyst coating layer to the internal wall surfaces of said struc ture or the surface of the skeletal thereof. |
