| 摘要 |
PURPOSE:To enhance catalytic activity and activity retention, by forming an alloy supported catalyst by supporting platinum, a transition metal other than platinum and a third metal other than said metals in an alloy form by a carrier. CONSTITUTION:A highly dispersed platinum supported catalyst (usually, an average crystal diameter; 20-30Angstrom ) is used as a matrix and a transition metal other than platinum is added to said catalyst. Subsequently, in a process for alloy supported platinum and the transition metal other than platinum, both metals are further contacted with a chemical species becoming a third component to form an alloy supported catalyst composed of three-component system finally consisting of platinum, the transition metal other than platinum and the third component. As the transition metal other than platinum, iron is pref. and, as the third component, carbon is pref. The alloy supported catalyst obtained has a high initial output characteristic and an enhanced economical output characteristic. |
