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MCM-48-supported vanadium oxide catalysts, prepared by the molecular designed dispersion of : a detailed study of the highly reactive MCM-48 surface and the structure and activity of the deposited
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| Abstract |
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| 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. | | |
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English
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Journal of catalysis. - San Diego, Calif. | |
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Journal of catalysis | |
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San Diego, Calif. : 2001
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0021-9517
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197:1(2001), p. 160-171
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000166505500018
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