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Synthesis, Characterization and Modification of Mcm-41 Molecular Sieves

Published online by Cambridge University Press:  28 February 2011

A. Sayari ,
V.R. Karra ,
J.S. Reddy  and
I.L. Moudrakovski
A. Sayari
Affiliation:
Department of Chemical Engineering and CERPIC, Université Laval, Ste-Foy, Qc, Canada G1K 7P4.
V.R. Karra
Affiliation:
Department of Chemical Engineering and CERPIC, Université Laval, Ste-Foy, Qc, Canada G1K 7P4.
J.S. Reddy
Affiliation:
Department of Chemical Engineering and CERPIC, Université Laval, Ste-Foy, Qc, Canada G1K 7P4.
I.L. Moudrakovski
Affiliation:
Department of Chemical Engineering and CERPIC, Université Laval, Ste-Foy, Qc, Canada G1K 7P4.
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Abstract

A series of crystalline mesoporous molecular sieves were prepared using alkyl hexadecyl dimethyl ammonium bromide salts (C16H33)(CnH2n + 1)(CH3)2NBr, in which the number of carbon atoms (n) in one alkyl group was varied from 1 to 12. The influence of (n) value on the nature of the final phase obtained and on its pore size was investigated. A hexagonal phase was obtained for n = 1, 3, 5 and 7, while a lamellar phase was obtained for all other templates. Vanadium and titanium modified MCM-41 molecular sieves were also prepared in the presence of C12H25(CH3)3N+ and C16H33(CH3)3N+ ions, respectively. These materials were characterized by XRD, nitrogen physisorption, FTIR, solid state NMR, XPS, UV-Vis and catalytic testing in the oxidation of 1-naphthol, 2,6-di-tert-butylphenol, norbornylene, n-hexane and propylamine. Ti-MCM-41 exhibited considerable catalytic activity only in the oxidation of aromatics, olefins and alcohols. V-MCM-41 was found to be a good catalyst in the oxidation of aromatics and alkanes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 371: Symposium W1 – Advances in Porous Materials , 1994 , 81
Copyright
Copyright © Materials Research Society 1995

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