HETEROCYCLES

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■ Ketalization of Glycerol with Acetone to O-Heterocyclic Compounds over ZrO2-SiO2 Solid Acid Catalysts

Chunni Fan, Chenghua Xu,* Chuanqi Liu, Zunyu Huang, Jianying Liu, and Zhixiang Ye

*Air Environmental Modeling and Pollution Controlling, Key Laboratory of Sichuan Higher Education Institutes, Chengdu University of Information Technology, No. 24, Block 1, Xuefu Road, Chengdu, Sichuan Province 610225, China

Abstract

The solid acid catalysts ZrO2-SiO2 mixed oxides were prepared by sol-gel, characterized by X-ray diffraction, NH3-temperature programmed desorption, fourier transform infrared spectroscopy, and applied in the glycerol catalytic ketalization with acetone to O-heterocyclic compounds in the present work. Simultaneously, the effects of the catalysts composition, calcination temperature and ketalization parameters such as reaction time, acetone/glycerol, catalyst amount and reaction temperature on the ketalization were also investigated in detail. The results showed that the main product for the glycerol ketalization with acetone was solketal with a 5-membered ring along with a small amount of 2,2-dimethyl-1,3-dioxan-5-ol with a 6-membered ring. ZrO2-SiO2 with a Zr/Si molar ratio of 0.5 calcined at 500 oC exhibited the best catalytic property in ketalization, gave 90.91% of glycerol conversion and 89.69% of solketal selectivity under the optimum conditions. It was also found that glycerol catalytic ketalization with acetone to solketal was mainly governed by kinetics.