【摘 要】
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During the last years there has been an increas ing interest in new mesoporous molecular sieves con taining transition metal cations in their framework.Substitu
【机 构】
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Department of Chemical Engineering, South China University of Technology, Guangzhou 510640, ChinaDep
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During the last years there has been an increas ing interest in new mesoporous molecular sieves con taining transition metal cations in their framework.Substitution of Si by Ti or V may provide zeolites with dramatic selective catalytic activity. The incor poration of titanium, vanadium and chromium into the silicate MCM-41 framework by electrostatic S+ I- assembly pathway under hydrothermal condi tions at 100～150 ℃ has been reported[1]. Here,we prepared some transition metal-containing meso porous molecular sieves Me-MCM-41 (Me= Ti, V,Cr, Mo, Mn, Zr, W) at ambient temperature through the halogen anion mediated S+ X I + as sembly pathway[2] (S+ -cationic quaternary ammo nium ion surfactants; X -halogen anion C1- or Br-; I+-cationic silicate precursors), by the hy drolysis of silicon source and transition metal source in strongly acidic medium, and in the presence of cetyl trimethyl ammonium bromide (CTMABr) as templating species.rn
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