SiO2-Al2O3 composite oxides with hierarchical pores as solid acid catalysts for tetrahydrofuran polymerization

A series of SiO 2 -Al 2 O 3 composite oxides with different parameters of porous structure was synthesized via sol-gel process at a systematically varied pH (pH 2, 5, 7, 9, 11, 13), and characterized by transmission electron microscope, N 2 adsorption-desorption measurements, X-ray powder diffractio...

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Bibliographic Details
Published in:Kinetics and catalysis 2013-11, Vol.54 (6), p.761-766
Main Authors: Ge, Yuan Yuan, Jia, Zhi Qi, Gao, Chun Guang, Zhao, Li Li, Li, Hai Tao, Zhang, Yin, Zhao, Yong Xiang
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Physical Chemistry
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Summary:A series of SiO 2 -Al 2 O 3 composite oxides with different parameters of porous structure was synthesized via sol-gel process at a systematically varied pH (pH 2, 5, 7, 9, 11, 13), and characterized by transmission electron microscope, N 2 adsorption-desorption measurements, X-ray powder diffraction, Fourier transform infrared spectroscopy, temperature-programmed desorption of ammonia and IR spectra of pyridine adsorption. The catalytic performance of SiO 2 -Al 2 O 3 was investigated in the catalytic polymerization of tetrahydrofuran. All the SiO 2 -Al 2 O 3 oxides are characterized by similar acidity but different porous properties. In the pH range of 7 to 9, the hierarchical pore system composed of mesopores and macropores is formed. Due to an enhanced accessibility of acid sites and easier diffusion of reacting molecules, the samples containing a hierarchical pore system of the catalysts show the highest yield of polytetrahydrofuran (about 48%) and an improved number-average molecular weight ( Mn ).
ISSN:0023-1584
1608-3210
DOI:10.1134/S0023158413060177