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《Chinese Journal of Catalysis》 2006-03
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Epoxidation of Allyl Alcohol to Glycidol on Ti-MWW Molecular Sieves

CHEN Xiaohui~*,FAN Zhiyong,QUAN Xia,WEI Kemei(National Engineering Research Center of Chemical Fertilizer Catalyst,College of Chemistry and Chemical Engineering,Fuzhou University,Fuzhou 350002,Fujian,China)  
Ti-MWW was prepared by acid treatment and calcination on a lamellar precursor which was synthesized under dynamic hydrothermal crystallization conditions using piperidine as a template,and boric acid as a stucture-supporting agent.The crystallization time is shortened by adding Ti-MWW seeds and increasing stirring rate.Ultraviolet-visible spectra show that the precursor contains tetrahedral and octahedral Ti species.Calcination of the precursor results in a partial condensation of the octahedral Ti to form the anatase phase.The octahedral Ti species belong to a kind of extraframework Ti,which can be removed easily by the acid treatment in a short time.The calcined Ti-MWW contains the anatase when the acid-treated time is too long.The characteristic infrared band at 960 cm~(-1) is not observed for the Ti-MWW precursor,but it appears in the samples treated by acid.Epoxidation of allyl alcohol with H_2O_2 on Ti-MWW was studied.Ti-MWW with Si/Ti ratio of 20 and acid treatment for 12~16 h is more effective.The conversation of allyl alcohol is 88.7%,and the selectivity for glycidol is 99% under the reaction conditions of 333 K and 30 min,but the catalytic activity of Ti-MWW decreases when the acid-treated time is too long.
【Fund】: 国家自然科学基金青年科学基金项目(20306004);; 福建省青年科技人才创新项目(2002J009);; 福建省教育厅科技项目(JB02061)
【CateGory Index】: O623.43;O643.32
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