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Direct 2H NMR Observation of the Proton Mobility of the Acidic Sites of Anhydrous 12-Tungstophosphoric Acid

Authors

  • Dr. Daniil I. Kolokolov,

    Corresponding author
    1. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 383 330 8056
    • Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 383 330 8056

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  • Maxim S. Kazantsev,

    1. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 383 330 8056
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  • Dr. Mikhail V. Luzgin,

    1. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 383 330 8056
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  • Prof. Hervé Jobic,

    1. Institut de Recherches sur la Catalyse et l'Environnement de Lyon, Université de Lyon 1, CNRS, 2. Av. A. Einstein, 69626 Villeurbanne (France)
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  • Prof. Alexander G. Stepanov

    Corresponding author
    1. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 383 330 8056
    • Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090 (Russia), Fax: (+7) 383 330 8056

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Abstract

original image

Flip and hop before you′re caught! The proton dynamics of solid 12-tungstophosphoric acid (TPA) is probed by solid-state 2H NMR in a temperature range from 293–503 K. Protons of TPA are shown to be involved in two types of molecular motion (see picture): the anisotropic local two-site flipping between the two possible orientations of the O[BOND]H bond at bridged oxygens of the Keggin anion, and the isotropic diffusion by hopping between neighboring surface oxygens of the anion.

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