纳米固体碱催化剂KF/CaO-MgO制备生物柴油  

Synthesis of biodiesel catalyzed by nano-sized KF/CaO-MgO solid base catalyst

作　　者：李斌[1] 段学友[1] 王运[1] 文利柏[1] 韩鹤友[1] 

机构地区：[1]华中农业大学理学院,湖北武汉430070

出　　处：《工业催化》2009年第6期42-45,共4页Industrial Catalysis

基　　金：国家高技术研究发展计划(863计划)重点项目(2007AA100703);华中农业大学创新基金(52204-05081)

摘　　要：采用共沉淀法制备复合物CaO-MgO,再以等体积浸渍法负载KF,制备了负载型固体碱催化剂KF/CaO-MgO,并将其用于催化菜籽油与甲醇酯交换反应制备生物柴油。考察了催化剂制备条件对酯交换反应的影响,并用扫描电镜、透射电镜和X射线衍射仪等手段对催化剂进行表征。结果表明,在m(CaO):m(MgO)=9:1、KF负载量为载体质量的25%和600℃焙烧3 h制备的催化剂具有较好的催化活性,酯化率达95%以上。催化剂具有多孔结构,孔径在100 nm左右,催化剂粒径(30～50)nm,是负载型纳米固体碱催化剂。Transesterification of rapeseed oil and methanol to biodiesel over supported KF/CaO-MgO solid base catalyst was studied.Preparation of the KF/CaO-MgO catalyst includes preparation of CaO- MgO by co-precipitation followed by supporting KF onto CaO-MgO by isochoric impregnation.Effects of catalyst preparation condition on the transesterification reaction were investigated.Good catalytic activity with transesterfication of over 95% was obtained under the following condition:m(CaO):m(MgO) =9:1, m(KF):m(carrier) =0.25,calcination temperature 600 ℃,calcination time 3 h.The catalyst samples were characterized by XRD,SEM and TEM and the results indicated that the catalyst had a porous struc- ture with pore diameter of about 100 nm and grain size of 30-50 nm.

关 键 词：催化剂工程 复合氧化物载体 纳米固体碱催化剂 共沉淀法 生物柴油 

分 类 号：TQ426.6[化学工程] TE667[石油与天然气工程—油气加工工程]