固体超强酸SO_4^(2-)/ZrO_2的动态行为及催化酯化活性

Dynamic Analysis of Solid Superacid SO 2- 4/ZrO 2 and Activity of Esterification

通过分析导出了用于计算脱附动力学参数的理论公式。以吡啶作为分子探针，利用程序升温脱附技术研究固体超强酸的动态行为，并用苯酐与２－乙基己醇酯化反应，考察其活性。实验结果表明，ＳＯ２－４／ＺｒＯ２（３００℃）和ＳＯ２－４／ＺｒＯ２（７５０℃）催化剂表面有一类酸位，ＳＯ２－４／ＺｒＯ２（５７５℃）有二类酸位。求出脱附活化能和指前因子。采用ＳＯ２－４／ＺｒＯ２作为酯化催化剂对酯化活性进行探讨，考察了焙烧温度对催化剂酸强度及活性的影响。

A dynamic experimental method and theoretical formula were obtained by analyzing the conditions of experiment in which solid catalysts were investigated by temperature programmed desorption. The experimental observations showed that there are two acid sites on the SO 2- 4/ZrO 2(575℃) and one acid site on the SO 2- 4/ZrO 2 (300℃) or SO 2- 4/ZrO 2(750℃). Desorption activating energy and pre-exponential factor were calculated. SO 2- 4/ZrO 2 were used as catalysts for esterification of phthalic anhyrid with 2-ethyl hexanol. The exterification activity of the catalysts were studied. Effect of calcination temperature of SO 2- 4/ZrO 2 catalyst on activity were discussed.