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M1 to M2 Phase Transformation and Phase Cooperation in Bulk Mixed Metal Mo–V–M–O (M=Te, Nb) Catalysts for Selective Ammoxidation of Propane

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Abstract

In the present study we systematically explored hydrothermal synthesis of bulk mixed metal Mo–V–(Te–Nb)–O catalysts and investigated the bulk characteristics of the resulting M1 and M2 phases as well as their roles in the selective ammoxidation of propane. It was found that unlike Mo–V–Te–Nb–O M1 phases, the Mo–V–Te–O M1 phases may be quantitatively transformed into M2 phases of the same chemical composition indicating that Nb stabilizes the M1 structure. The stabilizing role of Nb and Te was further observed in high resolution TEM studies of Mo–V–(Te–Nb)–O catalysts which indicated that structural order and the M1 phase domain size progressively decreased in this order: Mo–V–Te–Nb–O > Mo–V–Te–O > Mo–V–O. The cooperation between the M1 and M2 phases in propane ammoxidation to acrylonitrile was observed only at low propane conversions suggesting that the M1 phase is the only crystalline phase required for the activity and selectivity of the Mo–V–Te–Nb–O catalysts in propane ammoxidation to acrylonitrile at practical propane conversions.

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Acknowledgments

This research was supported by the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy under Grant No. DE-FG02-04ER15604. We also thank the Geology Department at the University of Cincinnati for the access to X-ray diffractometer.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221-0012, USA

    P. Korovchenko, N. R. Shiju & V. V. Guliants

  2. Electron Microscopy Center, ASTeCC, University of Kentucky, Lexington, KY, 40506, USA

    A. K. Dozier

  3. The University of Kentucky Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY, 40511-8479, USA

    U. M. Graham

  4. Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie 2, Madrid, 28049, Spain

    M. O. Guerrero-Pérez

Authors
  1. P. Korovchenko
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  2. N. R. Shiju
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  3. A. K. Dozier
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  4. U. M. Graham
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  5. M. O. Guerrero-Pérez
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Correspondence to V. V. Guliants.

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Korovchenko, P., Shiju, N.R., Dozier, A.K. et al. M1 to M2 Phase Transformation and Phase Cooperation in Bulk Mixed Metal Mo–V–M–O (M=Te, Nb) Catalysts for Selective Ammoxidation of Propane. Top Catal 50, 43–51 (2008). https://doi.org/10.1007/s11244-008-9098-8

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  • DOI: https://doi.org/10.1007/s11244-008-9098-8

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