CuO-ZnO/Al_2O_3催化剂对醋酸甲酯催化加氢制乙醇的研究  

The study of CuO-ZnO/Al_2O_3 catalysts for catalytic hydrogenation of methyl acetate to ethanol

作　　者：罗立文 刘雯雯 王亚卫 汤周 商红岩 

机构地区：[1]中国石油大学(华东)理学院,山东青岛266580

出　　处：《应用化工》2017年第9期1773-1778,共6页Applied Chemical Industry

摘　　要：采用并流共沉淀法制备了醋酸甲酯催化加氢合成乙醇的CuO-ZnO/Al_2O_3催化剂,并通过N_2物理吸附、X射线衍射(XRD)、程序升温还原(H_2-TPR)、扫描电子显微镜(SEM)等表征手段分析了催化剂的物理化学特性,探究加料方式、铜锌铝的配比对催化剂结构的影响与催化剂活性之间的关系。结果表明,加料方式为并流、铜锌铝的配比为5∶2∶1时,催化剂前驱体的架构最为规整,焙烧后得到的CuO颗粒较小,且分散最为均匀,具有较多且分散的活性组分,表现出了最优的加氢性能。在反应温度220℃,反应压力3.0MPa,质量液时空速0.5h-1和氢酯物质的量比9的条件下,醋酸甲酯的转化率达到97.6%,乙醇的选择性高达97.5%。The CuO-ZnO/Al2O3 catalysts for catalytic hydrogenation of methyl acetate（MA） to ethanol were prepared through cocurrent coprecipitation method. The catalysts were characterized by N2 adsorp-tion-desorption, X-ray diffraction （ XRD ） , temperature-programmed reduction （ H2-TPR） , scanning elec-tron microscope （ SEM） . The addition modes of coprecipition method and the effects of the different Cu ： Zn ： Al ratios on the catalyst structure and catalytic performance were investigated. The results showed that cocurrent coprecipitation method and catalyst of Cu： Zn： Al =5：2： 1 had dispersed homogeneously copper particles and a large number of active centers, and therefore exhibited the best hydrogenation perform-ances in the reaction. Under the condition of 220 ℃ ,3 MPa,LHSV =0. 5 h 1, H2/ester molar ratio = 9, methyl acetate conversion and the selectivity to ethanol reached 91.6% and 91.5% Respectively.

关 键 词：醋酸甲酯 乙醇 催化加氢 并流共沉淀法 CuO-ZnO/Al2O3催化剂 

分 类 号：TQ032[化学工程]