Preparation of grafted silica-based solid acid catalyst and application in esterification
WU Jie, ZENG Dan-lin, XU Ke, WANG Yuan-yuan, YANG Yuan-yuan
Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract: SiO2 microspheres are prepared by sol-gel method,and used as carrier to synthesize silica-based solid acid catalyst by grafting method.Catalytic activity of the prepared silica-based solid acid is investigated through esterification reaction between acetic acid and ethanol.The catalyst is also used to catalyze the esterification between adipic acid and n-butanol.SiO2 microspheres and the catalyst are characterized by means of scanning electron microscope,X-ray diffraction and Fourier Transform infrared spectroscopy.The effects of different reaction conditions on the catalytic property of solid acid are studied.The results show that the acid amount and the esterification rate of solid acid catalyst reach the maximum when the grafting temperature is set at 140℃,grafting time is 12 h and oxidation time is 6 h.In the process of catalytic synthesis of dibutyl adipate,the highest esterification rate can reach 94.44% when the reaction temperature is set at 105℃,the molar ratio of n-butanol to adipic acid is 4∶1 and the adding amount of catalyst is 0.3 g.
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