Preparation,characterization,and catalytic performance of a novel methyl-rich Ti-HMS mesoporous molecular sieve with high hydrophobicity  

作　　者：LI XueFeng1,XU ZhiHong1,GAO HuanXin2 & CHEN QingLing2 1College of Chemistry and Chemical Engineering,Xuchang University,Xuchang 461000,China 2Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,China 

出　　处：《Science China Chemistry》2010年第6期1337-1345,共9页中国科学（化学英文版）

基　　金：supported by the Key Program for Science and Technology Development of Henan Province (092102210221);the Program for Natural Science Research of the Education Department of Henan Province (2009B150025)

摘　　要：A novel methyl-rich Ti-containing hexagonal mesoporous silica (Ti-HMS) molecular sieve with high hydrophobicity has been prepared by a two-step method involving co-condensation followed by vapor-phase methyl grafting.The sample was characterized by XRD,N2 adsorption,FTIR,UV-visible and 29Si NMR spectroscopies,TG,ICP-AES,and hydrophilicity measurements,and its catalytic performance was evaluated using the epoxidation of cyclohexene as a probe reaction.The Ti-HMS material retains a typical mesoporous structure and compared with a co-condensed Ti-HMS prepared in a one-step method possesses more methyl groups and higher hydrophobicity,and also exhibits better catalytic activity and selectivity.A novel methyl-rich Ti-containing hexagonal mesoporous silica (Ti-HMS) molecular sieve with high hydrophobicity has been prepared by a two-step method involving co-condensation followed by vapor-phase methyl grafting.The sample was characterized by XRD,N2 adsorption,FTIR,UV-visible and 29Si NMR spectroscopies,TG,ICP-AES,and hydrophilicity measurements,and its catalytic performance was evaluated using the epoxidation of cyclohexene as a probe reaction.The Ti-HMS material retains a typical mesoporous structure and compared with a co-condensed Ti-HMS prepared in a one-step method possesses more methyl groups and higher hydrophobicity,and also exhibits better catalytic activity and selectivity.

关 键 词：two-step METHYL grafting HIGH HYDROPHOBICITY methyl-rich TI-HMS epoxidation of CYCLOHEXENE 

分 类 号：O643.32[理学—物理化学]