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《Chemical Research In Chinese Universities》 2004-01
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A Novel Liquid-solid Isomorphous Substitution Route for Preparing Zeolite Ti-β

ZHOU Wei, CHUN Yuan*, XU Qin-Hua, WANG Cheng, DONG Jia-Lu (Department of Chemistry, Nanjing University, Nanjing 210093, China)  
A novel convenient method, liquid-solid isomorphous substitution(LSIS) of Ti(SO 4) 2, was used to post-synthesize titanium beta(Ti-β) zeolite in this paper. The prepared Ti-β zeolites were characterized by XRD, IR, Raman, UV-Vis, XPS, adsorption of hexane, as well as catalytic testing. Ti-β zeolite prepared from 30% Ti(SO 4) 2 showed good catalytic properties, while excessive usage of Ti(SO 4) 2 rendered an inferior catalyst. The results from Raman, UV-Vis and adsorption of hexane indicate that fewer extra-framework Ti species were formed on these modified samples. The presence of the strong absorption band around 220 nm in UV-Vis spectra and the appearance of the band around 960 cm -1 in IR spectra demonstrate that the tetrahedrally coordinated Ti-atoms exist in the framework of Ti-containing zeolites. These Ti-β zeolites prepared by LSIS method were active in the epoxidation of olefin with H 2O 2, and the main products are the alcoholysis and hydrolysis product of the epoxide, due to the stronger acidic sites remained on the catalysts. The significantly higher activity can be achieved on these Ti-β zeolites in epoxidation of cyclohexene with respect to conventional TS-1 zeolite.
【Fund】: 国家自然科学基金 (批准号 :3 445 65 46)资助
【CateGory Index】: O643.3
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