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- W2000339942 abstract "Cyclopropane (CP) chemisorption on silica-molybdena catalysts photoreduced in CO was found to result in a sharp increase (by more than one order of magnitude at 293 K) of specific activities for propene metathesis. IR and UV-vis diffuse reflectance spectroscopic studies revealed that the promoting effect of CP treatment was associated with the formation of surface carbene species arising from CP interaction with low coordinated Mo4+ ions produced by photoreduction of Mo6+/SiO2 in CO. Such carbones (MoCH2) are found to be thermally stable in vacuo up to 650 – 700 K, oxygen resistant at 293 K and to react with water vapour at ~400K to yield CH4. The IR data obtained showed fast reversible transformation of MoCH2 to MoCD2 after C2D4 admission. In addition to MoCH2, the spectroscopic data indicate the formation of ethylene and propene π -complexes with Mo4+ ions and Mo cyclobutanes during CP chemisorption. Ethylene adsorbed on Mo4+ ions gave rise to π-complexes and possibly Mo-cyclopentane species. A general scheme for CP interaction with photoreduced Mo4+/SiO2 explaining all the spectroscopic data obtained, the composition of the thermally desorbed products and the promoting effect of CP chemisorption on metathesis is presented and discussed." @default.
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- W2000339942 date "1989-11-01" @default.
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- W2000339942 title "Ir and UV-vis spectroscopic studies of the stable MoCH2 carbene complexes over photoreduced silica-molybdena catalysts with chemisorbed cyclopropane, and their role in olefin metathesis reactions" @default.
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- W2000339942 doi "https://doi.org/10.1016/0304-5102(89)80248-2" @default.
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