JIA Zhiqi, LIANG Jifen, LIU Xiaohong, LIU Xi, HAN Yanhui, GAO Chunguang, ZHAO Yongxiang
(1. College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China; 2. Research Center for Fine Chemicals Engineering, Taiyuan 030006, China)
Abstract: The mesoporous Zr-PHTS solid acid using the P123 triblock copolymer as a structure directing agent were prepared by the one-pot hydrothermal method in water-organic solvent system. These prepared samples were characterized by powder X-ray diffraction (XRD), TEM, N2 sorption isotherms, IR spectra of pyridine adsorption, and NH3-TPD. The characterization results indicated that 2D hexagonal mesoporous structure was retained on Zr-PHTS catalysts. The acidic examination showed that all materials had medium acidity dominated by Lewis acid sites according to the analysis of Pyridine adsorption and NH3-TPD. With the increasing Si/Zr molar ratio from 20 to 100, the BET surface areas of Zr-PHTS were varied a little, the pore diameters were kept at 9.8 nm. The polymerization reaction of THF showed the mesoporous Zr-PHTS solid acid an excellent catalyst. The Zr-PHTS-30 sample had the highest catalytic activity among the prepared catalysts, the yield was 40.4 % and the average molecular weight of the polymer maintained 2135. Such results could be related to the larger pore size and moderate acidic sites.
Key words: Zr-PHTS; hydrothermal synthesis; mesoporous solid acid; tetrahydrofuran; catalytic polymerization
E-mail: yxzhao@sxu.edu.cn
Journal of Molecular Catalysis, Vol. 26, Issue 2, 2012, 135-140
