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Niobium oxide acidity studied by proton broad-line NMR at 4 K and MAS NMR at room temperature

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Abstract

The quantitative study of the Brønsted acidity of niobic acid (Nb2O5·xH2O) using broad-line1H NMR at 4 K has been performed by interacting niobic acid, pretreated at 573 K under vacuum, with water molecules. The number of oxyprotonated species (H3O+ and H2O...HO species formed, unreacted acidic OH groups or excess H2O molecules) deduced from the simulations of the broad-line1H NMR spectra shows a continuous increase in the number of H3O+ species with adsorbed water molecules. This increase may be due to a classical dilution effect or to a synergistic interaction between Brønsted and Lewis acid sites. These results are compared with those of some HY zeolites with or without framework defects.

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Authors and Affiliations

  1. Laboratoire de Chimie des Surfaces associé au CNRS, URA1428, Université Pierre et Marie Curie, Tour 55,4 Place Jussieu, 75252, Paris Cedex05, France

    Patrice Batamack, Robert Vincent & Jacques Fraissard

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  1. Patrice Batamack
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  2. Robert Vincent
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  3. Jacques Fraissard
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Batamack, P., Vincent, R. & Fraissard, J. Niobium oxide acidity studied by proton broad-line NMR at 4 K and MAS NMR at room temperature. Catal Lett 36, 81–86 (1996). https://doi.org/10.1007/BF00807209

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  • DOI: https://doi.org/10.1007/BF00807209

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