氧化锌负载金和铂选择催化氧化燃料电池氢源中微量CO的研究

Selective catalytic oxidation of CO in rich hydrogen over gold-platinum supported on zinc oxide for potential application in fuel cell

采用共沉淀法制备了负载型Au/ZnO催化剂 ,采用催化氧化方法脱除富氢中微量的CO研究结果表明 ,催化剂中Au的合适含量 (质量分数 )为 1 5 % ,适宜的焙烧温度为 3 0 0℃ ,即Au( 1 5 ) /ZnO 3 0 0。在Au( 1 5 ) /ZnO 3 0 0体系中加入少量的PtO组分有利于提高催化剂的稳定性。进一步研究表明 ,当Pt含量超过 1 0 %时 ,会降低催化剂的催化氧化选择性。因此在实验条件下 ,催化剂比较理想的组成为 1 5 %Au ,1 0 %Pt,焙烧温度为 3 0 0℃ ,即Au( 1 5 ) Pt( 1 0 ) /ZnO 3 0 0。对制备的催化剂采用XRD ,BET进行了基本表征 。

The zinc oxide catalysts were prepared by using a coprecipitation procedure and it showed that its optimum composition was 1.5% by weight in ZnO and the ideal calcining temperature was 300?℃, tagged as Au(1.5)/ZnO-300. When a little amount of platinum was added into Au(1.5)/ZnO-300, it showed that the catalyst had better stability during 500 hours continuous experimental investigation for Au(1.5)-Pt/ZnO-300 to selectively remove CO at 80?℃. However, when the content of platinum in Au(1.5)/ZnO-300 was over 1.0%, the selectivity of removal of CO for Au(1.5)-Pt/ZnO-300 was lowered with increasing content of Pt. The ideal composition for Au(1.5)-Pt/ZnO-300 was 1.0% Pt by weight, tagged as Au(1.5)-Pt(1.0)/ZnO-300.