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Title
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Synthesis of stable, hydrophobic MCM-48/VOx catalysts using alkylchlorosilanes as coupling agents for the molecular designed dispersion of VO(acac)(2)
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Author
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Abstract
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| The use of dimethyldichlorosilane as a coupling agent for the grafting of VOx structures on the MCM-48 surface produces a material that is simultaneously hydrophobic (immiscible with water) and very active (all V centers are accessible, even for water molecules). The VOx surface species are grafted by the molecular designed dispersion of VO(acac)(2) on the silylated surface, followed by a calcination in air at 450 degrees C. These hydrophobic MCM-48 supported VOx catalysts are thermally stable up to 500 degrees C. The grafted VOx surface species are very resistant toward leaching-out in aqueous media. Also, the structural and hydrothermal stability has improved enormously. The crystallinity of the materials does not decrease when the samples are subjected to a hydrothermal treatment at 150 degrees C and 4.7 atm pressure. A reaction mechanism is proposed and consolidated by FT-IR, Raman spectroscopy, and UV-vis diffuse reflectance. Pore size distributions, water adsorption isotherms, and X-ray diffractograms confirm the structural stability of these materials. |
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Language
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English
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Source (journal)
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The journal of physical chemistry : B : materials, surfaces, interfaces and biophysical. - Washington, D.C., 1997, currens
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Publication
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Washington, D.C.
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1999
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ISSN
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1089-5647
[print]
1520-5207
[online]
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DOI
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10.1021/JP992146U
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Volume/pages
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103
:46
(1999)
, p. 10102-10108
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ISI
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000083978500006
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Full text (Publisher's DOI)
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