| 摘要 |
PURPOSE:To obtain the title catalyst capable of being highly activated by preclassifying a carrier to control the diameter of secondarily flocculated particles within a specified range, and depositing a noble metal on the carrier. CONSTITUTION:Carbon powder is dispersed in a soln., the obtained dispersion is classified into respective products having the same particle diameter by natural settling using a settling tube or centrifugal separation, and the powder having uniform particle diameter can be obtained. The secondarily flocculated particles having 0.15-6mum particle diameter is selected from the classified products, and used to prepare a platinum-deposited catalyst and a platinum and iron-deposited catalyst in the same way as the conventional method. Platinum is uniformly dispersed on the carrier in the form of fine particles, the obtained platinum-deposited catalyst has high activity, and sintering of platinum caused by the operating conditions of a battery can be minimized. |
