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- W1560642707 abstract "The thermal spreading of metal oxides over oxide supports has been intensively investigated over the past decade and much is currently known about this process. This chapter discusses the recent reports in the literature that an alternative route to the preparation of such supported metal oxide catalysts involves solid-state reactions. A new phenomenon of reaction induced spreading of crystalline MoO3 and V2O5 on oxide supports is observed at temperatures much lower than that required for thermal spreading via solid-state reactions, 200–250 °C vs. 400–500 °C. It has been demonstrated that significant dispersion of MoO3 or V2O5 on a titania support could not be achieved at temperatures of 500°C with the physically mixed oxides in the form of a catalyst pellet. Thus, dispersion of MoO3 and V2O5 on oxide supports, at much lower temperatures, for physically mixed catalysts in the form of pellets, cannot be because of thermal spreading and must occur by another mechanism. The in situ Raman studies clearly demonstrate that spreading of MoO3 and V2O5 over different oxide supports in the form of catalyst pellets readily occurred during methanol oxidation at temperatures as low as 230 °C. This suggests that a strong interaction between the gas phase components and the crystalline metal oxide phases may be occurring. The current findings that reaction induced spreading of metal oxides on oxide supports can occur during oxidation reactions at very low temperatures have important implications for commercial applications as well as fundamental studies." @default.
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- W1560642707 date "1997-01-01" @default.
- W1560642707 modified "2023-10-15" @default.
- W1560642707 title "Reaction induced spreading of metal oxides: in situ Raman spectroscopic studies during oxidation reactions" @default.
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- W1560642707 doi "https://doi.org/10.1016/s0167-2991(97)80986-x" @default.
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