负载型MoO_3催化剂的结构与催化酯化性能研究  

Study on Structure and Catalytic Performance of Supported MoO_3 Catalyst in Esterification

作　　者：杜长海[1] 邢华琼[1] 孙德[1] 

机构地区：[1]长春工业大学化学工程学院,吉林长春130012

出　　处：《精细化工》2010年第8期779-783,818,共6页Fine Chemicals

基　　金：吉林省科技厅自然科学基金资助项目(20040570)~~

摘　　要：以SiO2和Al2O3为载体,采用等体积浸渍法制备了MoO3质量分数为1%～30%的负载型MoO3催化剂。采用X射线粉末衍射(XRD)、比表面积测定(BET)、程序升温脱附(NH3-TPD)等对催化剂的结构和性能进行了表征,以乙酸乙酯的合成为模型反应评价了催化剂的催化酯化性能。结果表明,MoO3/SiO2和MoO3/Al2O3催化剂对酯化反应具有较好的催化活性和选择性,对于MoO3/SiO2催化剂,适宜的MoO3负载量为5%。催化剂的多孔结构和弱酸中心有利于酯化反应的进行。A series of supported MoO3 catalysts were prepared by an equivalent-volumetric impregnation method with the MoO3 loadings ranging from 1% to 30%,with SiO2 and Al2O3 as the carrier.The samples were characterized by X-ray diffraction（XRD）,specific surface area measurements（BET）,temperature-programmed desorption（NH3-TPD）.The catalytic esterification of acetic acid with ethanol was carried out in a three-neck flask at 90～100 ℃.The results clearly revealed that MoO3/SiO2 and MoO3/Al2O3 catalysts were active and selective towards the formation of ethyl acetate.The MoO3/SiO2 catalyst containing 5% MoO3 was the most active and selective one.The results emphasize the importance of the porous structure together with the weak acidic sites of the prepared catalyst towards the ester formation.

关 键 词：MoO3/SiO2 MoO3/Al2O3 催化酯化 乙酸乙酯 催化剂结构 

分 类 号：O614.612[理学—无机化学] O643.32[理学—化学]