摘要
采用共沉淀法制备了不同配比的Cu-Zn-A1复合氧化物催化剂,利用XRD和TPR等表征技术及活性评价考察了催化剂各组分配比对催化剂性能的影响,并对各组分配比进行了优化。试验结果表明,Al的摩尔分数为20%,Cu/Zn摩尔比为0.5～2.0时,Cu-Zn-Al催化剂在常压下耦合法制备γ-丁内酯反应具有良好的活性。XRD表明灼烧后未经还原的催化剂活性组分为CuO。通过XRD、TPR及BET表征发现,适宜的Cu/Zn摩尔比可以提高催化剂比表面积,使CuO具有较高分散性及高的还原性能,从而有利于提高催化剂的选择性。
The catalyst of Cu-Zn-Al composite oxide system was prepared by co-precipitation. XRD and TPR were used to characterize the catalyst, the influence of catalyst composition,such as Al content, Cu/Zn ratio, on catalytic performance for the coupling process was analyzed, and the optimal composition was obtained. The experiment showed that the catalyst with 20% Al and n （Cu/Zn） = 0.5-2.0 have good catalytic performances. The CuO species and its occupation on the catalyst surface were the determining factors for the catalyst activity. Results of XRD,TPR and BET showed that n （Cu/Zn） is responsible for the dispersion of CuO and the surface area of catalyst. The suitable n（Cu/Zn） can improve the selectivity of catalysts.
出处
《化学工业与工程》
CAS
2008年第5期382-385,共4页
Chemical Industry and Engineering
关键词
顺酐
1
4-丁二醇
Γ-丁内酯
耦合
沉积
maleic anhydride
1,4-butanediol
γ-butyrolactone
coupling
precipitation
