Cu-Zn-Ce催化顺丁烯二酸酐气相加氢

采用共沉淀法制备了一系列Cu-Zn-Ce催化剂,在反应压力1MPa,反应温度220～280℃的条件下,进行顺丁烯二酸酐(MA)气相加氢活性测试,MA转化率接近100%,γ-丁内酯选择性达91.93%。同时正丁醇发生脱氢-歧化-酯化反应,可提供MA加氢耗氢量4.14%～59.67%的氢气。用XRD、TPR、N_2吸附等手段对催化剂进行了表征,结果表明:采用超声共沉淀法可以制得粒径小、比表面积大的催化剂;加入ZnO可以促进Cu~(2+)还原,提高活性Cu~0组分的分散程度;CeO_2与ZnO的协同作用可以提高催化剂的活性。

GAS PHASE HYDROGENATION OF MALEIC ANHYDRIDE OVER Cu-Zn-Ce CATALYSTS

A series of the Cu-Zn-Ce catalysts were prepared by a co-precipitation method. The catalysts were characterized by XRD, TPR, and N_2 adsorption.The catalytic performance of the gas phase hy- drogenation of maleic anhydride in the presence of n-butanol was studied at 1 MPa and 220-280℃. The conversion of maleic anhydride was near to 100% and the selectivity ofγ-butyrolactone was up to 91.93%. At the same time, n-butanol was converted to hydrogen and butyl butyrate via reactions, such as dehydrogenation, disproportionation, and esterfication. The presence of ZnO promoted the re- duction of copper oxide to metallic copper and enhanced the dispersion of Cu~o in the catalysts. The synergic effect of CeO_2 and ZnO is beneficial to the catalytic activity of Cu~o.