Ordered mesoporous sulfated silica-zirconia materials with high zirconium contents in the structure

被引:0
|
作者
Yunchen Du
Yinyong Sun
Yan Di
Lan Zhao
Sen Liu
Feng-Shou Xiao
机构
[1] Jilin University,College of Chemistry & State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
来源
Journal of Porous Materials | 2006年 / 13卷
关键词
Sulfated; Silica-zirconia; Ordered mesoporous; High zirconium contents; Structure;
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中图分类号
学科分类号
摘要
A series of mesoporous sulfated silica-zirconia materials with various Si/Zr molar ratios (2.0–5.0) have been prepared using tri-block copolymer as a template, which were characterized by X-ray diffraction, TEM, nitrogen adsorption, UV-Vis diffuse reflectance spectroscopy, infrared spectroscopy, thermal gravimetric analysis, and catalytic reactions. XRD patterns displayed that ordered mesoporous sulfated silica-zirconia materials were obtained when the molar ratio of Si/Zr was not less than 4.0 (ZrSiS-4 and ZrSiS-5). When the molar ratio of Si/Zr was less than 4.0, the samples had a separated phase of amorphous sulfated zirconia (ZrSiS-2 and ZrSiS-3). Furthermore, TEM images (ZrSiS-4 and ZrSiS-5) revealed that the mesostructure of these materials were highly ordered. N2 adsorption (ZrSiS-4 and ZrSiS-5) exhibited typical IV adsorption isotherms and uniform pore distribution. UV-Vis reflectance and IR spectra suggested (ZrSiS-4 and ZrSiS-5) that Zr atoms were incorporated into the walls of mesoporous silica. Cracking reactions of cumene and 1,3,5-triisopropylbenzene (TIPB) showed that, the ordered mesoporous sulfated silica-zirconia materials were very active in acidic catalytic reactions, especially for the cracking of large molecules.
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页码:163 / 171
页数:8
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