Abstract
A series of SiO2-Al2O3 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, N2 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 SiO2-Al2O3 was investigated in the catalytic polymerization of tetrahydrofuran. All the SiO2-Al2O3 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).
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