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- W1584281593 abstract "Publisher Summary This chapter discusses the investigation of the mechanism of allyl alcohol oxidation into acrolein on the rhombic phase of MoO 3 modified with V 2 O 5 . Allyl alcohol oxidation into acrolein on the rhombic phase of molybdanum oxide modified with vanadium oxide has been studied by the kinetic method and by ESR of V 4+ ions in situ. The electron paramagnetic resonance (ESR) study of this reaction in situ has shown that the active sites of the V–MoO 3 catalyst are V 4+ ions that are situated mainly in the bulk of the catalyst or near the surface. These ions supply electrons for the oxygen activation. The second step of the redox catalytic process, reduction, proceeds via alcohol interaction with V 5+ ions at the surface. Thus, a continuous electron exchange between the catalyst surface and the bulk takes place during the reaction. This electron exchange is accompanied by oxygen ions exchange in the case of hexagonal phase of MoO 3 . In the hexagonal phase, there are numerous cavities throughout the whole crystal. Their diameter is about 0.5 nm. They can provide oxygen diffusion and, therefore, fast reoxidation. Such cavities are absent in the rhombic phase. But, the rhombic phase has a much dense lattice and oxygen diffusion in this phase is slower. This slow oxygen diffusion also explains the somewhat smaller catalytic activity of the rhombic phase of MoO 3 ." @default.
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- W1584281593 date "1997-01-01" @default.
- W1584281593 modified "2023-09-28" @default.
- W1584281593 title "Active sites of vanadium-molybdenum-containing catalyst for allyl alcohol oxidation: ESR study in situ" @default.
- W1584281593 cites W2006144690 @default.
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- W1584281593 doi "https://doi.org/10.1016/s0167-2991(97)80988-3" @default.
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