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- W1998492571 abstract "Abstract Molybdena/alumina and molybdena/zirconia catalysts with Mo surface densities in the range 1.1–5.2 Mo/nm 2 were studied by in situ vibrational (Raman and FTIR) spectroscopies and 18 O/ 16 O isotopic exchange experiments combined with in situ Raman spectra at 450 °C. The vibrational isotope effects and the combined interpretation of Raman and IR band wavenumbers and characteristics suggest a mono-oxo configuration for the deposited molybdena phase on both catalytic systems at low (∼1.5 Mo/nm 2 ) as well as at high (4–5 Mo/nm 2 ) coverage, irrespective of extent of association (polymerisation). Isolated mono-oxo monomolybdates predominate on alumina at low loadings, while increasing relative amounts of mono-oxo polymolybdates are formed at high loadings. Mono-oxo polymolybdates and monomolybdates occur on zirconia, with the polymolybdates predominating already from low coverage (1.7 Mo/nm 2 ). A “next-nearest-neighbor 18 O/ 16 O substitution” vibrational effect is observed, resulting in small red shifts (2–5 cm −1 ) of the Mo 16 O Raman band wavenumber. The catalysts’ behavior for the oxidative dehydrogenation of ethane is addressed and discussed with relevance to the configuration of deposited molybdena." @default.
- W1998492571 created "2016-06-24" @default.
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- W1998492571 date "2010-12-01" @default.
- W1998492571 modified "2023-10-16" @default.
- W1998492571 title "Structural and vibrational properties of molybdena catalysts supported on alumina and zirconia studied by in situ Raman and FTIR spectroscopies combined with 18O/16O isotopic substitution" @default.
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- W1998492571 doi "https://doi.org/10.1016/j.cattod.2010.06.026" @default.
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