助剂对甲烷部分氧化制合成气镍基催化剂性能的影响

摘要: 考察了添加助剂铈、镧和钙对镍基催化剂反应性能的影响，发现助剂对以α-Al2O3为载体的镍基催化剂的调变作用比以γ-Al2O3为载体的镍基催化剂好，且助剂铈对催化剂的性能改善最好。在此基础上，研究了不同载量的铈对催化剂性能的影响。结果表明，铈的质量分数为1%时对催化剂的性能改善最好。同时采用XRD、XPS、TG等技术，研究了助剂铈对10％Ni/γ-Al2O3催化剂的改性作用。XRD分析表明，铈负载量较低时，催化剂中的CeO2高度分散在催化剂表面，铈负载量较高时，CeO2形成微晶颗粒，降低了催化活性。

Abstract: The promotional effect of Ce, La and Ca on the catalytic performance of Ni catalyst was investigated. The results indicated that the effect of promoters on Ni/α-Al2O3 is better than that on Ni/γ-Al2O3. Ce was proved to be the best promoter among the three promoters tested and the effect of different loadings of promoter Ce on the catalytic performance was investigated.The results showed that the optimum content of Ce was 1%. The effect of Ce loading on 10%Ni/γ-Al2O3 catalyst was investigated by XRD, XPS and TG techniques. XRD result indicated that Ce was highly dispersed at low loadings, but crystallized into bulk CeO2 at higher loading, thus, decreased the catalytic activity.