钛的添加对Cu-Co-Zn/Al_2O_3乙醇一步合成乙酸乙酯催化剂性能的影响

Influence of Titanium Addition on the Properlies of Cu-Co-Zn/Al_2O_3 Catalyst for One-step Synthesis of Ethyl Acetate from Ethanol

利用TPR、TPD和EPR技术研究了钛的添加对Cu-Co-Zn／Al2O3催化剂表面酸碱性及其还原性能的影响，表明钛的引入能有效促进Cu2＋的还原和调变催化剂酸性位及碱性应的强度和数量，使之更加有利于相关基无反应的进行。不同载钛量对催化剂性能影响的研究结果表明，载钛量为3％时，在300℃和空速2．0h－1条件下，乙醇转化率为83．0％，乙酸乙酯选择性为57．4％。

By using TPR, TPD and EPR techniques, the influence of titanium addition on the surface acidity andalkality and reducibility for Cu-Co-Zn/Al2O3 catalyst were studied. The results show that addition of titaniumcan effectively promote the reduction of Cu2+ and modify the intensity and number of acidic and basic sites,which favours the reaction. The influence of titanium loadings on the properties of the catalyst was investigated. When titanium loading is 3%, ethanol conversion of 83. 0% and selectivity to ethyl acetate of 57. 4%,were attained at 300℃ and WHSV of 2. 0h-1.