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An Investigation of the Reduction and Reoxidation of Isolated Vanadate Sites Supported on MCM-48

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Abstract

The reduction and subsequent reoxidation of isolated vanadate species supported on silica was investigated using temperature-programmed reduction and oxidation, along with in-situ XANES and Raman spectroscopy. Approximately 70–80% of the vanadium was reduced to V3+ after reduction in H2 at temperatures up to 923 K. Upon reduction, the vanadyl oxygen was removed and the three remaining V–O bonds are lengthened by 0.2 Å. The vanadate species are rapidly reoxidized when exposed to O2, with the amount of oxygen uptake matching well with the amount removed during reduction. In-situ Raman spectroscopy during reoxidation in 18O2 showed that significant scrambling occurs between gas phase oxygen and surface oxygen species during the reoxidation of the vanadate species.

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Acknowledgments

This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Chemical Science Division, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Portions of this research were carried out at the Stanford Synchrotron Radiation Laboratory, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences.

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Authors and Affiliations

  1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA

    Jason L. Bronkema & Alexis T. Bell

  2. Department of Chemical Engineering, University of California, Berkeley, CA, 94720-1462, USA

    Jason L. Bronkema & Alexis T. Bell

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  1. Jason L. Bronkema
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  2. Alexis T. Bell
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Correspondence to Alexis T. Bell.

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Bronkema, J.L., Bell, A.T. An Investigation of the Reduction and Reoxidation of Isolated Vanadate Sites Supported on MCM-48. Catal Lett 122, 1–8 (2008). https://doi.org/10.1007/s10562-007-9382-4

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  • DOI: https://doi.org/10.1007/s10562-007-9382-4

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