In situ laser raman spectroscopy during sequential oxidizing and reducing conditions for a vanadium-phosphorous-oxide catalyst

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A VPO catalyst prepared in an organic medium has been studied by in situ laser Raman spectroscopy under reaction conditions for n-butane oxidation to maleic anhydride. Data were obtainable at low laser power and short collection times. Raman characterization during continuous flow (steady state) revealed that the (VO){sub 2}P{sub 2}O{sub 7} phase was present. Sequential oxidizing (10% O{sub 2} in N{sub 2}) and reducing (2% n-butane in N{sub 2}) conditions were explored at 350{degree} and 400{degree}C. Cycling (unsteady state) revealed enhancement of {alpha}{sub II}-VOPO{sub 4}, {beta}-VOPO{sub 4}, {gamma}-VOPO{sub 4}, and {delta}-VOPO{sub 4} during oxidizing conditions; intensity of Raman bands due ... continued below

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30 p.

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Soejarto, A.D.; Schrader, G.L. & Coulston, G.W. December 31, 1995.

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  • Soejarto, A.D.
  • Schrader, G.L. Iowa State Univ. of Science and Technology, Ames, IA (United States)
  • Coulston, G.W. Du Pont de Nemours (E.I.) and Co., Wilmington, DE (United States). Central Research and Development Dept.

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Description

A VPO catalyst prepared in an organic medium has been studied by in situ laser Raman spectroscopy under reaction conditions for n-butane oxidation to maleic anhydride. Data were obtainable at low laser power and short collection times. Raman characterization during continuous flow (steady state) revealed that the (VO){sub 2}P{sub 2}O{sub 7} phase was present. Sequential oxidizing (10% O{sub 2} in N{sub 2}) and reducing (2% n-butane in N{sub 2}) conditions were explored at 350{degree} and 400{degree}C. Cycling (unsteady state) revealed enhancement of {alpha}{sub II}-VOPO{sub 4}, {beta}-VOPO{sub 4}, {gamma}-VOPO{sub 4}, and {delta}-VOPO{sub 4} during oxidizing conditions; intensity of Raman bands due to (VO){sub 2}P{sub 2}O{sub 7} increased during reducing conditions.

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30 p.

Notes

OSTI as DE96006812

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  • 2. international conference on unsteady state processes in catalysis, St. Louis, MO (United States), 10-13 Sep 1995

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  • Other: DE96006812
  • Report No.: IS-M--842
  • Report No.: CONF-9509333--1
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 205128
  • Archival Resource Key: ark:/67531/metadc671199

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Nov. 20, 2015, 9:31 p.m.

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Soejarto, A.D.; Schrader, G.L. & Coulston, G.W. In situ laser raman spectroscopy during sequential oxidizing and reducing conditions for a vanadium-phosphorous-oxide catalyst, article, December 31, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc671199/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.