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用共沉淀法制备了Au/Co3O4 ,Pt/Co3O4 及Au Pt/Co3O4 催化剂 ,并考察了其对H2 与CO在O2 过量情况下完全共氧化的催化作用 .结果表明 ,在三种催化剂上H2 与CO之间都存在复杂且各不相同的相互作用 .与Pt/Co3O4 催化剂上不同 ,在Au/Co3O4 和Au Pt/Co3O4 催化剂上H2 严重抑制CO的氧化 .同时 ,Au Pt/Co3O4 催化剂上H2 与CO能够在较低的温度 (76℃ )下有效地实现完全共氧化 .TPR结果表明 ,与Pt/Co3O4 催化剂相比 ,Au Pt/Co3O4 催化剂上Au的存在使Pt的还原峰消失
The co-precipitation method was used to prepare the Au / Co3O4, Pt / Co3O4 and Au Pt / Co3O4 catalysts and their catalytic activities for complete co-oxidation of H2 and CO over O2 were investigated. The results showed that H2 and CO have complex and different interactions with each other.Different from Pt / Co3O4 catalysts, H2 strongly inhibits CO oxidation on Au / Co3O4 and Au Pt / Co3O4 catalysts.At the same time, H2 and CO was able to effectively complete co-oxidation at a lower temperature (76 ° C) .The results of TPR showed that the presence of Au on Au Pt / Co3O4 catalyst disappeared the reduction peak of Pt compared with Pt / Co3O4 catalyst