Oxidation states of vanadium in V-P-O oxidation catalysts 31P NMR by spin-echo mapping

Juan Li, M. E. Lashier, G. L. Schrader, Bernard C. Gerstein

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

The oxidation state of vanadium in V-P-O catalysts before and after use has been examined using 31P NMR spin echo mapping. The presence of V4+ and V5+ species could be detected for β-VOPO4, (VO)2P2O7 and industrially-related materials with P/V=0.9, 1.0, and 1.1. Magnetic susceptibility measurements were used to confirm the presence of para-magnetic vanadium in most catalysts which had been exposed to n-butane or 1-butene. Several models of active V-P-O catalysts have been offered previously which can be related to the NMR results.

Original languageEnglish (US)
Pages (from-to)83-95
Number of pages13
JournalApplied Catalysis
Volume73
Issue number1
DOIs
StatePublished - May 30 1991

Keywords

  • catalyst characterization (P NMR)
  • n-butane
  • oxidation catalysts
  • oxidation states
  • vanadium-phosphorus oxides.

ASJC Scopus subject areas

  • Engineering(all)

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