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Synthesis and Characterization of Ordered Mesoporous Zirconium-doped Silica with Strong Acidity

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Author(s): DENG Jun | ZHANG Hong-sheng | FU Wen-sheng

Journal: Journal of Chongqing Normal University
ISSN 1672-6693

Volume: 28;
Issue: 3;
Start page: 53;
Date: 2011;
Original page

Keywords: zironia | silica | mesoporous materials | cumene | cracking

ABSTRACT
A series of mesoporous sulfated silica-zirconia materials with various Si/Zr molar ratios(2.0-5.0) have been prepared using stri-block copolymer as a template, which was characterized by X-ray diffraction, TEM, nitrogen adsorption-desorption, 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 more than 4.0. When the molar ratio of Si/Zr was less than 4.0, the samples had a separated phase of amorphous sulfated zirconia. Furthermore, TEM images revealed that the mesostructure of these materials were highly ordered. N2 adsorption exhibited typical IV adsorption-desorption isotherms and uniform pore distribution. UV-Vis reflectance, and IR spectra suggested 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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