Effect of titanium substitution on the structure of VSbO4 catalysts for propane ammoxidation

Guang Xiong, Vivian S. Sullivan, Peter C Stair, Gerry W. Zajac, Steven S. Trail, James A. Kaduk, Joseph T. Golab, James F. Brazdil

Research output: Contribution to journalArticle

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Abstract

The effect of titanium substitution on vanadium antimony oxide propane ammoxidation catalysts was investigated by UV Raman spectroscopy and X-ray diffraction. UV Raman spectra exhibit bands in the region of 450-1000 cm -1, which are associated with the rutile structure, a cation vacancy site, and V2O5. Calculations of the vibrational frequencies made with the use of CASTEP optimized slab models provide good agreement with experimental results. With titanium substitution, the rutile bands shift and broaden. Comparison of freshly prepared and ground samples shows that crystalline V2O5 forms upon grinding in air. Titanium stabilizes vanadium in the vanadium antimonate rutile structure and thus prevents the formation of crystalline V2O5. An in situ Raman characterization of titanium-containing vanadium antimony oxide catalysts was made in reducing and oxidizing atmospheres. The band associated with two-coordinate oxygen at cation vacancy sites disappears under reduction conditions, then returns after reoxidation in air. This indicates that this lattice oxygen moiety is key to ammonia activation. The titanium-substituted sample shows additional characteristics that indicate titanium improves the reduction and oxidation capability of the vanadium antimonate catalyst.

Original languageEnglish
Pages (from-to)317-326
Number of pages10
JournalJournal of Catalysis
Volume230
Issue number2
DOIs
Publication statusPublished - Mar 10 2005

Fingerprint

Propane
Vanadium
Titanium
propane
Substitution reactions
vanadium
titanium
substitutes
catalysts
Catalysts
rutile
Antimony
antimony
Vacancies
Cations
Positive ions
Oxygen
Crystalline materials
cations
Oxides

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Xiong, G., Sullivan, V. S., Stair, P. C., Zajac, G. W., Trail, S. S., Kaduk, J. A., ... Brazdil, J. F. (2005). Effect of titanium substitution on the structure of VSbO4 catalysts for propane ammoxidation. Journal of Catalysis, 230(2), 317-326. https://doi.org/10.1016/j.jcat.2004.11.046

Effect of titanium substitution on the structure of VSbO4 catalysts for propane ammoxidation. / Xiong, Guang; Sullivan, Vivian S.; Stair, Peter C; Zajac, Gerry W.; Trail, Steven S.; Kaduk, James A.; Golab, Joseph T.; Brazdil, James F.

In: Journal of Catalysis, Vol. 230, No. 2, 10.03.2005, p. 317-326.

Research output: Contribution to journalArticle

Xiong, G, Sullivan, VS, Stair, PC, Zajac, GW, Trail, SS, Kaduk, JA, Golab, JT & Brazdil, JF 2005, 'Effect of titanium substitution on the structure of VSbO4 catalysts for propane ammoxidation', Journal of Catalysis, vol. 230, no. 2, pp. 317-326. https://doi.org/10.1016/j.jcat.2004.11.046
Xiong, Guang ; Sullivan, Vivian S. ; Stair, Peter C ; Zajac, Gerry W. ; Trail, Steven S. ; Kaduk, James A. ; Golab, Joseph T. ; Brazdil, James F. / Effect of titanium substitution on the structure of VSbO4 catalysts for propane ammoxidation. In: Journal of Catalysis. 2005 ; Vol. 230, No. 2. pp. 317-326.
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