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

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300℃，即Au(1.5)/ZnO-300。在Au(1.5) /ZnO-300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，10%Pt，焙烧温度为300℃，即Au(1.5)-Pt(1.0)/ZnO-300。对制备的催化剂采用XRD，BET进行了基本表征，并应用ICP对催化剂的组成进行了分析。

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

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-300was lowered with increasing content of Pt.The ideal composition for Au(1.5)-Pt/ZnO-300was 1.0% Pt by weight, tagged as Au(1.5)-Pt(1.0)/ZnO-300.