MCM-41负载S_2O_8^(2-)/TiO_2固体超强酸的制备和酯化性能研究  

Solid Superacid S_2O_8^(2-)/TiO_2 Supported on MCM-41: Preparation and Catalytic Performance for Esterification

作　　者：陈静[1] 孙蕊[1] 韩梅[1] 郭微[1] 王锦堂[1] 

机构地区：[1]南京工业大学理学院应用化学系,南京210009

出　　处：《无机化学学报》2006年第3期421-425,共5页Chinese Journal of Inorganic Chemistry

基　　金：中国石油化工股份有限公司资助项目(J102012)。

摘　　要：采用液相沉积法制备了由MCM-41介孔分子筛负载S2O82-/TiO2的固体超强酸催化剂。探讨了成酸机理,并以乙酸和异戊醇的酯化反应作为探针反应考察了焙烧温度、浸渍溶液浓度等制备条件对催化剂催化活性的影响,得到了较佳的制备条件。XRD、N2吸附-脱附和FTIR结果表明,固体超强酸保持了MCM-41的介孔结构,BET表面积高达211m2·g-1,且具有强酸性(Ho<-12.70)。The solid superacid S2O82-/TiO2 supported on mesoporous MCM-41 was prepared by the liquid-phase precipitation, and the mechanism for the formation of superacid was suggested. The esterification reation of acetic acid and iso-amyl alcohol was selected as a probe reaction to test the catalytic performance. The optimum condi- tions for preparation of the catalyst were obtained as follows： molar ratio of Ti to Si was 1：1, concentration of （NH4）2S2O8 was 0.5 mol·L^-1, impregnation time was 5 h, calcinations temperature and time were 550 ℃ and 4 h, respectively. The structure of the solid superacid was characterized by XRD, N2 Adsorption/desorption and FTIR. The results showed that mesoporous structure of MCM-41was maintained in the catalyst system with a high BET surface area of 211 m2·g^-1 and better solid acidity.

关 键 词：固体超强酸 介孔分子筛 酯化反应 

分 类 号：O643.36[理学—物理化学]