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

SiO2-Al2O3 composite oxides with hierarchical pores as solid acid catalysts for tetrahydrofuran polymerization
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分级孔SiO2-Al2O3复合氧化物作为四氢呋喃聚合固体酸催化剂

DOI:
10.1134/s0023158413060177
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发表时间:
2013-11
影响因子:
1.1
通讯作者:
Yong Xiang Zhao
Yong Xiang Zhao
中科院分区:
化学4区
文献类型:
--
作者:
Yuan Yuan Ge;Zhi Qi Jia;Chun Guang Gao;Li Li Zhao;Hai Tao Li;Yin Zhang;Yong Xiang Zhao

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采用Sol-Gel法制备了一系列具有不同孔结构参数的SiO_2-Al_2O_3复合氧化物,系统地改变了pH值(pH=2,5,7,9,11,13),并用透射电子显微镜、氮气吸附-脱附测试、X-射线粉末衍射、傅立叶变换红外光谱、程序升温脱附和吡啶吸附的红外光谱对其进行了表征。考察了SiO_2-Al_2O_3在四氢呋喃催化聚合中的催化性能。所有的SiO_2-Al_2O_3氧化物都具有相似的酸性,但具有不同的孔道性质。在pH值为7~9的范围内,形成由中孔和大孔组成的层状孔隙系统。由于酸中心的可及性增强,反应分子更容易扩散,含有分级孔系统的催化剂的样品显示出最高的聚四氢呋喃的产率(约48%)和改善的数均相对分子质量(MN)。
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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