| MCM-41负载S2O82-/TiO2固体超强酸的制备和酯化性能研究 |
| Solid Superacid S2O82-/TiO2 Supported on MCM-41: Preparation and Catalytic Performance for Esterification |
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| 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211 m2·g-1，且具有强酸性(Ho<-12.70)。 |
| 关键词: 固体超强酸 介孔分子筛 酯化反应 |
| 基金项目: |
| Abstract: 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 conditions 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-41 was maintained in the catalyst system with a high BET surface area of 211
m2·g-1 and better solid acidity. |
| Keywords: solid superacid mesoporous molecular sieve esterification |
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| 陈静,孙蕊,韩梅,郭微,王锦堂.MCM-41负载S2O82-/TiO2固体超强酸的制备和酯化性能研究[J].无机化学学报,2006,22(3):421-425. |
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