CuCeZr催化乙醇脱氢制备乙酸乙酯

Dehydrogenation of ethanol to synthesize ethyl acetate catalyzed by CuCeZr

乙醇作为一种重要的低碳平台分子,其下游转化制备高附加值化学品相关研究备受关注,其中乙醇脱氢法制备乙酸乙酯是一条具有竞争力的反应路线。利用共沉淀法合成了系列CuCeZr催化剂,考察共沉淀pH值对乙醇脱氢制备乙酸乙酯催化性能的影响,考察并优化反应温度、反应压力和空速等反应条件。结果表明,当沉淀pH=12时,CuCeZr催化剂的催化性能最优。在最佳条件95%乙醇水溶液为原料、进料速率0.1 mL·min-1、反应温度240℃、反应压力1.0 MPa和无载气时,乙醇转化率与乙酸乙酯选择性分别达45.6%和80.6%。催化剂连续250 h稳定运行,表明该催化剂具有良好的催化稳定性。

Ethanol is an important low-carbon platform molecule,and its downstream conversion to produce high value-added chemicals has attracted much attention.The conversion of ethanol via dehydrogenation to ethyl acetate is a competitive reaction route.In this paper,a series of CuCeZr catalysts were synthesized by coprecipitation method.In particular,the influence of pH value of coprecipitation on the catalytic performance of catalyst was investigated.Furthermore,the influence of reaction conditions,including reaction temperature,pressure and space velocity were investigated and optimized.The results show that the precipitation pH as 12 was benefit for the selective generation of ethyl acetate from ethanol.And the ethanol conversion and ethyl acetate selectivity achieved 45.6% and 80.6%,respectively at 240℃,1.0 MPa using ethanol aqueous solution as raw material(0.1 mL·min-1)and free of carrying gas.The results of 250 h continuous reaction indicated the good stability of CuCeZr catalyst.