Title
MCM-48-supported vanadium oxide catalysts, prepared by the molecular designed dispersion of <tex>$VO(acac)_{2}$</tex> : a detailed study of the highly reactive MCM-48 surface and the structure and activity of the deposited <tex>$VO_{x}$</tex> MCM-48-supported vanadium oxide catalysts, prepared by the molecular designed dispersion of <tex>$VO(acac)_{2}$</tex> : a detailed study of the highly reactive MCM-48 surface and the structure and activity of the deposited <tex>$VO_{x}$</tex>
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
San Diego, Calif. ,
Subject
Chemistry
Source (journal)
Journal of catalysis
Journal of catalysis. - San Diego, Calif.
Volume/pages
197(2001) :1 , p. 160-171
ISSN
0021-9517
ISI
000166505500018
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The molecular designed dispersion of vanadyl acetylacetonate (VO(acac)(2)) is used to prepare MCM-48-supported vanadium oxide catalysts. The complex is deposited on the MCM-48 surface and subsequently thermally converted into the supported vanadium oxide. A thorough study of the interaction of the VO(acac)(2) with the MCM-48 support by ESR spectroscopy and chemical methods reveals that the MCM-48 surface exhibits a remarkably higher chemical reactivity in comparison to amorphous silica, which is attributed to the presence of very reactive strained siloxane bridges on the MCM-48 surface. According to the BET, XRD, and FTIR study of the supported vanadium oxide catalysts the unique structural properties of MCM-48 are maintained. Characterization by FTIR, Raman, and UV-vis diffuse reflectance spectroscopy reveals the presence of different VO, structures (monomers, polymers, and crystals) as a function of the vanadium loading (0-6.5 wt% V). The oxidation of methanol similarly shows increasing conversion and formaldehyde yields with increasing loading. Structural characterization of the catalyst after the reaction reveals that the MCM-48-supported vanadium oxides withstand catalytic reaction conditions. (C) 2001 Academic Press.
E-info
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