Supported VPO catalysts for selective oxidation of butane. II. Characterization of VPO/SiO2 catalysts

Kari E. Birkeland, Scott M. Babitz, Gregory K. Bethke, Harold H. Kung, George W. Coulston, Simon R. Bare

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

SiO2-supported VPO catalysts with different P/V ratios were prepared, used in selective oxidation of butane, and characterized by X-ray diffraction (XRD), laser Raman spectroscopy (LRS), near-edge X-ray absorption spectroscopy (XANES), and 31P magic angle spinning NMR. Similar to the SiO2-supported catalysts of lower metal loadings studied previously, the maleic anhydride selectivity increased with increasing P/V ratio, to greater than 50 mol % for P/V = 2. XRD and LRS detected predominantly α1-VOPO4 or a phase that is structurally very similar for both P/V = 1 and P/V = 2 samples. However, within the detection limit of the XANES experiment, the P/V = 1 catalyst contained mostly V5+ under reaction conditions, whereas the P/V = 2 catalyst contained 100% V4+.

Original languageEnglish
Pages (from-to)6895-6902
Number of pages8
JournalJournal of Physical Chemistry B
Volume101
Issue number35
DOIs
Publication statusPublished - Aug 28 1997

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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