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《Journal of Fushun Petroleum Institute》 2003-02
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Study on Surface Chemistry of SO_4~(2-)/TiO_2 Solid Superacid Catalysts

REN Li-guo, GAO Wen-yi (Department of Materials Science and Engineering, Liaoning University of Petroleum & Chemical Technology, Liaoning Fushun 113001,China)  
SO42-/TiO2 solid superacid catalysts was prepared from TiCl4 and H2SO4 by process of precipitation,aging, filtering, washing,maceration and calcination.The structure of the body and surface of SO42-/TiO2 was determined by XRD and LRS.The S contents , acid strength and the types of acidic center in the SO42-/TiO2 solid superacid catalysts were determined by chemical analysis,Hammett indicators and FT-IR spectroscopy of pyridine adsorption methods.The surface combined formation between SO42- and TiO2 on the surface of SO42-/TiO2 was determined by FT-IR spectra.The energy of the SO42-/TiO2,TiO2,Ti(SO4)2 were determined by XPS.The result shows that solid superacid can be formed in the SO42-/TiO2 system in 425~575 ℃. There are Lewis and Bronsted acidic centers on the surface of the solid superacid with both centers being exchanged. Anatase structure is presented in the body and on the surface of the solid superacid with crystalline of Ti(SO4)2 and TiOSO4 being not presented. The OH on the surface of SO42-/TiO2 is the Bronsted acidic centers and the empty sites of Ti4+ is Lewis acidic centers in the SO42-/TiO2.The SO42- coordinats into Ti4+ in the form of gear-bridge.The strong inducing effect of electrons is produced due to the strong ability of attracting electron with centers of solid superacid being fomed.
【CateGory Index】: O643.36
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