| 摘要 |
PURPOSE:To strongly support a platinum group element, to markedly shorten a process and to enhance catalytic activity, by forming a platinum type oxidizing catalyst by supporting platinum group element by a porous metal carrier such as nickel by a flame spraying method. CONSTITUTION:A platinum group element is supported by a porous metal carrier by adapting a flame spraying method to form a platinum oxidizing catalyst. For example, the porous metal carrier having a diameter of 25mm and a thickness of 5mm is prepared, for example, using a commercial foamed metal body comprising a nickel-25wt% chromium alloy having an average pore size of 1.5-2mm. A platinum group element powder with an average particle size of 3mum or less is applied to said carrier by plasma spraying to strongly fix platinum showing metal gloss thereto. As the porous metal carrier, a nickel base alloy is pref. from the aspect of heat resistance and oxidation resistance and, especially, a nickel-chromium alloy is pref. from the aspect of catalytic action. |
