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

doi:10.1016/0166-9834(91)85114-B

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 journal › Article › peer-review

61 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 language	English (US)
Pages (from-to)	83-95
Number of pages	13
Journal	Applied Catalysis
Volume	73
Issue number	1
DOIs	https://doi.org/10.1016/0166-9834(91)85114-B
State	Published - May 30 1991
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

General Engineering

Access to Document

10.1016/0166-9834(91)85114-B

Cite this

@article{a0b5b45c381341b489db49db0b4fa146,

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

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.",

keywords = "catalyst characterization (P NMR), n-butane, oxidation catalysts, oxidation states, vanadium-phosphorus oxides.",

author = "Juan Li and Lashier, {M. E.} and Schrader, {G. L.} and Gerstein, {Bernard C.}",

note = "Funding Information: This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract No. W-7405-ENG-82. The authors are indebted to Dr. Venceslav Rutar of Iowa State University for suggesting the 31p spin-echo mapping technique, and to Professor Ferdinando Borsa at Iowa State University for discussions regarding the effects of unpaired electron spin as NMR of 31p (VO) 2P207.",

year = "1991",

month = may,

day = "30",

doi = "10.1016/0166-9834(91)85114-B",

language = "English (US)",

volume = "73",

pages = "83--95",

journal = "Applied Catalysis",

issn = "0166-9834",

publisher = "Elsevier B.V.",

number = "1",

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TY - JOUR

T1 - Oxidation states of vanadium in V-P-O oxidation catalysts 31P NMR by spin-echo mapping

AU - Li, Juan

AU - Lashier, M. E.

AU - Schrader, G. L.

AU - Gerstein, Bernard C.

N1 - Funding Information: This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract No. W-7405-ENG-82. The authors are indebted to Dr. Venceslav Rutar of Iowa State University for suggesting the 31p spin-echo mapping technique, and to Professor Ferdinando Borsa at Iowa State University for discussions regarding the effects of unpaired electron spin as NMR of 31p (VO) 2P207.

PY - 1991/5/30

Y1 - 1991/5/30

N2 - 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.

AB - 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.

KW - catalyst characterization (P NMR)

KW - n-butane

KW - oxidation catalysts

KW - oxidation states

KW - vanadium-phosphorus oxides.

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