MCM-41负载碱金属对其酯交换反应催化活性的影响  

INFLUENCE OF ALKALI METAL SUPPORTED ON MESOPOROUS MCM-41 ON ITS CATALYTIC ACTIVITY FOR TRANSESTERIFICATION

作　　者：许慎敏[1] 陈慧[1] 梁宝臣[1] 宋子兰[1] 

机构地区：[1]天津理工大学化学化工学院,天津300191

出　　处：《石油学报（石油加工）》2008年第B10期223-225,共3页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金（20676106）、国家科技部重大基础研究前期研究专项（2005CCA06500）及天津市科技计划项目（07QTPTJC29900）资助

摘　　要：以MCM-41分子筛为载体，碱金属氧化物为活性组分，采用等体积浸渍法制备了固体碱催化剂。采用CO2—TPD技术对无机固体碱催化剂的表面碱作用性能进行了深入研究，同时，采用HPLC—ELSD方法考察了负载不同碱金属的催化剂对酯交换反应的催化活性。结果表明，催化剂表面存在2种不同强度的碱活性中心，而且通过经典TPD脱附活化能估算模型获得了CO2脱附活化能动力学参数。催化剂表面CO2的脱附活化能越大，催化剂的碱性越强及对酯交换反应的催化活性越强。The catalysts were prepared by impregnation of MCM-41 with different aqueous solution of basic metal salts. The temperature programmed desorption （TPD） technique was carried out to determine the TPD spectra of CO2 desorbed from the catalysts. The activation energy of CO2 was estimated by using the classical TPD model. The catalytic activity of catalysts for transesterification to produce biodiesel was investigated and products were analyzed using high performance liquid chromatography with evaporative light-scattering detector （HPLC-ELSD）. The results showed that there was the same order between desorption activation energy and catalytic activity.

关 键 词：MCM-41分子筛 固体碱催化剂 CO2脱附活化能 酯交换反应 

分 类 号：O643[理学—物理化学]