Abstract.
After recalling a few advances made by 1H, 29Si, and 27Al on the understanding of hydro-desulfuration (HDS) molybdenum-based catalysts supported on amorphous oxides, we critically evaluate the potential of 95Mo magic-angle spinning nuclear magnetic resonance (MAS NMR) for gaining further insight into the structure of uncalcined precursors and sulfided HDS catalysts. It is shown that when performed at a very high field (19.6 T), it is indeed sensitive to the nature of the molybdenum–support interaction. In particular, a wide distribution of the molybdenum environment present on the surface was evidenced. However, the possibility to characterize sulfided catalysts by 95Mo MAS NMR appeared still an unmet challenge.
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Authors' address: Jean-Baptiste d'Espinose de Lacaillerie, PPMD, Ecole Supérieure de Physique et de Chimie Industrielles, 10 rue Vauquelin, Paris 75231, Cedex 05, France
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d'Espinose de Lacaillerie, JB., Gan, Z. MAS NMR Strategies for the Characterization of Supported Molybdenum Catalysts. Appl Magn Reson 32, 499–511 (2007). https://doi.org/10.1007/s00723-007-0033-0
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DOI: https://doi.org/10.1007/s00723-007-0033-0