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DOI: 10.1039/A604029B (Paper) Reference Section for: J. Mater. Chem., 1997, 7, 159-162

Synthesis and characterization of vanadosilicate mesoporous molecularsieves MCM-41

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Dong Ho Park, Chi-Feng Cheng, Heyong He and Jacek Klinowski*

Abstract

A range of mesoporous vanadosilicate molecular sieves with the MCM-41 structure and the atomic ratio Si/V=10–160 have been synthesized using vanadyl sulfate as the source of vanadium. The products were characterized by XRD and51V and 29Si MAS NMR spectroscopy. The increase of the unit-cell parameter (monitored by XRD) and the decrease of the Q3 /Q4 ratio (determined from the 29Si spectra) with increasing vanadium content indicate the incorporation of vanadium into the MCM-41 structure. In as-synthesized [Si,V]-MCM-41, vanadium is in an octahedral environment and is located mainly on the surface of the channels. The amount of octahedral vanadium decreases and tetrahedral V is increasingly created as the calcination temperature increases.

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