载体极化率对乙酸甲酯加氢Cu/ZnO催化剂的作用机制研究  

Roles of the Support Polarity Ratio on Cu/ZnO Catalysts for Methyl Acetate Hydrogenation

作　　者：廖俊宇 赵玉军[1] 王胜平[1] 马新宾[1] 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072

出　　处：《化学工业与工程》2017年第6期11-17,共7页Chemical Industry and Engineering

基　　金：国家自然科学基金(21276186);天津市应用基础与前沿技术研究计划(13JCZDJC33000)

摘　　要：采用水热法合成不同极化率的ZnO载体来制备Cu/ZnO催化剂,研究了ZnO极化率对Cu/ZnO催化剂的物理化学性质和催化活性的影响。通过对样品进行N_2-吸附、SEM、TPR、XPS、XRD、ICP-OES和N_2O滴定等表征,发现极化率对催化剂的物理结构性质和铜物种的分散状态影响不大,但强烈影响Cu/ZnO催化剂的催化活性。随着极化率降低,催化活性先上升后下降。高极化率的催化剂由于具有更多的ZnO_x氧缺陷结构和更强的Cu-ZnO相互作用,利于Cu-ZnO_x的形成。Parent ZnO with different polarity ratios were synthesized by hydrothermal method, and used as a component in Cu/ZnO catalysts. Samples were systematically characterized by N2-adsorption, SEM, TPR, XPS, XRD, ICP-OES, and N2O titration. The characterization showed that the samples had similar textural properties and dispersion behaviors, and polarity ratio strongly influenced the catalytic performance. As polarity ratio decreased, the conversion of MA increased and then declined. A higher polarity ratio facilitated Cu-ZnOx species, which was attributed to more ZnOx oxygen vacancies and a stronger interaction between copper and polar ZnO facet.

关 键 词：乙酸甲酯 乙醇 加氢 Cu/ZnO催化剂 极化率 

分 类 号：TQ032.4[化学工程]