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- W2079842028 abstract "Specific activities of silica-molybdena catalysts (1% Mo by weight), prereduced in CO or H2 either photochemically at 300 K or thermally at 773 K, for the propylene metathesis reaction at room temperature are compared. It is found that preliminary photoassisted reduction of Mo6+SiO2 upon UV irradiation is an effective way to produce active catalysts. Turnover numbers (TON) for photoreduced MoSiO2 considerably exceed those for thermally reduced samples (by a factor of 6–10) and are even higher (by a factor of 2–3) than the TON for one of the most active “anchored” organomolybdenum catalysts, Mo(η3-C3H5)2SiO2. It is shown that propylene metathesis over photoreduced silica-molybdenum occurs via a Langmuir-Hinshelwood mechanism and catalytically active sites involve Mo4+ ions. Poisoning the catalysts by O2, N2O, or NO adsorption is also studied. The possible reasons for higher catalytic activity of photoreduced samples are discussed. A direct comparison is made between the present results and those of M. Anpo I. Tanahashi, and Y. Kubokawa (J. Chem. Soc. Faraday Trans. 1 78, 2121 (1982)) on the rates of propylene metathesis over Mo6+PVG in C3H6 atmosphere under UV irradiation." @default.
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- W2079842028 date "1986-03-01" @default.
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- W2079842028 title "Use of photoreduction for activation of silica-molybdena catalysts for propylene metathesis: Comparison with thermal reduction" @default.
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- W2079842028 doi "https://doi.org/10.1016/0021-9517(86)90296-4" @default.
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