Pt/Pt-Ce/γ-Al2O3催化氧化甲苯研究

通过等体积浸渍法制备单贵金属Pt/γ-Al₂O₃和双金属Pt-Ce/γ-Al₂O₃催化剂,考察Ce对催化剂活性的影响,确定催化剂最优配比。结果表明,当Pt的负载量为质量分数0.5%时,Pt/γ-Al₂O₃催化活性最高;当Pt的负载量为质量分数0.2%,Ce的负载量为质量分数1.0%时,Pt-Ce/γ-Al₂O₃催化剂的催化活性最高。Pt-Ce/γ-Al₂O₃催化剂的甲苯转化率高于Pt/γ-Al₂O₃催化剂。随着Pt负载量增大,催化剂孔容、孔径减小。粉体式催化剂性能优于整体式催化剂,但差别不大;Ce的添加有助于催化剂活性的提升。

Combustion of toluene over Pt/Pt-Ce/γ-Al2O3 catalysts

A Pd/γ-Al₂O₃ catalyst and a Pd-Ce/γ-Al₂O₃ catalyst were prepared by equal volume impregnation method,the effect of Ce doping on the catalytic oxidation of toluene was investigated,and the optimum loading of the active component Pt was discussed.The results showed that the Pt/γ-Al₂O₃ catalyst had the highest catalytic activity when the loading mass fraction of Pt was 0.5%.When the loading mass fraction of Pt was 0.2% and the loading mass fraction of Ce was 1.0%,Pt-Ce/γ-Al₂O₃ catalyst had the highest catalytic activity.The conversion of toluene over Pt-Ce/γ-Al₂O₃ catalyst was higher than that of Pt/γ-Al₂O₃ catalyst.The pore volume and pore diameter increased with the increasing of the Pt loading.The catalytic performance of powder catalysts was better than that of monolithic catalysts,but the difference was not significant.The addition of Ce contributed to the improvement of the catalytic activity.