Aerogel VOx/MgO catalysts for oxidative dehydrogenation of propane

Ilya V. Mishakov, Aleksey A. Vedyagin, Alexander F. Bedilo, Vladimir I. Zaikovskii, Kenneth J. Klabunde

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

VOx/MgO aerogel catalysts were synthesized using three different preparation methods: by mixing the aerogel MgO support with dry ammonium vanadate, by vanadium deposition from a precursor solution in toluene, and by hydrolysis of a mixture of vanadium and magnesium alkoxides followed by co-gelation and supercritical drying. The latter aerogel technique allowed us to synthesize mixed vanadium-magnesium hydroxides with the surface areas exceeding 1300 m2/g. The synthesized catalysts were studied by a number of physicochemical methods (XRD, Raman spectroscopy, XANES and TEM). A common feature of all synthesized samples is the lack of V2O5 phase. In all cases vanadium was found to be a part of a surface mixed V-Mg oxide (magnesium vanadate), its structure depending on the synthesis method. The VOx/MgO mixed aerogel sample had the highest surface area 340 m2/g, showed higher catalytic activity and selectivity in oxidative dehydrogenation of propane compared to the catalysts prepared by impregnation and dry mixing. The addition of iodine vapor to the feed in 0.1-0.25 vol.% concentrations was found to increase to propylene yield by 40-70%.

Original languageEnglish
Pages (from-to)278-284
Number of pages7
JournalCatalysis Today
Volume144
Issue number3-4
DOIs
Publication statusPublished - 30 Jun 2009
Externally publishedYes

Keywords

  • Aerogels
  • Iodine
  • Magnesium oxide
  • Nanoparticles
  • Oxidative dehydrogenation
  • Propane
  • Propene
  • Vanadium

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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