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The first observation of Mo5+ in the passivation layer of Mo2N

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Chinese Science Bulletin

Abstract

Molybdenum nitride powder with Sg of 115 m2 · g1 (passivated) has been prepared by a temperature programmed reaction of MoO3in H2/N2 mixture. It exhibited high catalytic activity in CO oxidation at low temperature. XPS, EPR and LRS studies have shown the existence of mixed valence states of Mo ions, especially Mo5+ ion (g(tT=1.932,g¦|=1.892) observed for the first time, in the passivation layer of molybdenum nitride. A surface Superoxide species, O2 (g = 2.001, Raman band 1 124 cm1), was found to be produced accompanying the transformation of Mo5+/Mo4+ redox pair. Evidence has been given to suggest that this surface superoxide might be responsible for CO oxidation over Mo2N catalyst.

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Authors and Affiliations

  1. State Key Laboratory of Oxo-Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000, Lanzhou, China

    Guohuang Xie & Zhicheng Jiang

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  1. Guohuang Xie
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  2. Zhicheng Jiang
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Correspondence to Zhicheng Jiang.

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Xie, G., Jiang, Z. The first observation of Mo5+ in the passivation layer of Mo2N. Chin.Sci.Bull. 45, 1562–1564 (2000). https://doi.org/10.1007/BF02886212

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  • DOI: https://doi.org/10.1007/BF02886212

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