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X-ray Absorption Spectroscopy of Bimetallic Pt–Re Catalysts for Hydrogenolysis of Glycerol to Propanediols

Authors

  • Oliver M. Daniel,

    1. Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, Charlottesville, VA 22904-4741 (USA), Fax: (+1) 434-982-2658
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  • Dr. Andrew DeLaRiva,

    1. Department of Chemical and Nuclear Engineering, University of New Mexico, 1 University of New Mexico, MSC01 1120, Albuquerque, NM 87131 (USA)
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  • Dr. Edward L. Kunkes,

    1. Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 2014 Engineering Hall, 1415 Engineering Drive, Madison, WI 53706-1607 (USA)
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  • Prof. Abhaya K. Datye,

    1. Department of Chemical and Nuclear Engineering, University of New Mexico, 1 University of New Mexico, MSC01 1120, Albuquerque, NM 87131 (USA)
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  • Prof. James A. Dumesic,

    1. Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 2014 Engineering Hall, 1415 Engineering Drive, Madison, WI 53706-1607 (USA)
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  • Prof. Robert J. Davis

    1. Department of Chemical Engineering, University of Virginia, 102 Engineers' Way, Charlottesville, VA 22904-4741 (USA), Fax: (+1) 434-982-2658
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Abstract

Bimetallic Pt–Re nanoparticles supported on Norit carbon were effective at converting aqueous glycerol to 1,3 (34 %) and 1,2 (33 %) propanediol at 443 K under 4 MPa of H2. Results from X-ray absorption spectroscopy and analytical transmission electron microscopy confirmed that the nanoparticles were indeed bimetallic, with a particle size less than 2 nm in diameter. The Pt LIII near edge spectra indicated that the Pt was reduced to the metallic state by treatment in H2 at 473 K, but that a partial positive charge remained on the Re. These oxidized Re species could be associated with charged Re atoms dispersed on the carbon support because spillover of H atoms from Pt was required to reduce Re in the bimetallic particles.

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