Structure and catalytic properties of vanadium oxide supported on mesocellulous silica foams (MCF) for the oxidative dehydrogenation of propane to propylene

Yong Mei Liu, Wei Liang Feng, Ting Cheng Li, He Yong He, Wei Lin Dai, Wei Huang, Yong Cao, Kang Nian Fan

Research output: Contribution to journalArticlepeer-review

187 Scopus citations

Abstract

A series of vanadium containing mesocellular silica foams (MCF) featuring a well-defined three-dimensional (3D) mesoporosity with ultralarge mesopores were studied with regard to their performance in the oxidative dehydrogenation (ODH) of propane. Catalysts supported on two-dimensional hexagonally ordered siliceous SBA-15 and MCM-41, as well as conventional amorphous silica, were also examined. The dispersity and the nature of the vanadium oxide species were characterized by means of DRIFTS, Raman spectroscopy, DR UV-vis, and H 2-TPR. Textural, SAXS, and TEM results indicate that the characteristic mesocellular structural features of MCFs are preserved after the vanadium incorporation. Spectroscopic measurements show that vanadium exists mainly in a tetrahedral environment in dehydrated V-MCF catalysts with V content <4.2 wt%, indicating that a very high surface concentration of isolated or low-polymeric VOx species could be achieved on the present V-MCF systems. The MCF-supported vanadia catalysts exhibit much higher propane conversion and propylene productivity than their conventional V-SBA, V-MCM, and V-SiO2 counterparts in the ODH of propane, demonstrating that apart from the active redox sites, internal molecular transport in mesopores of the catalyst also plays an important role in the gas-phase selective oxidation reactions.

Original languageEnglish
Pages (from-to)125-136
Number of pages12
JournalJournal of Catalysis
Volume239
Issue number1
DOIs
StatePublished - 1 Apr 2006
Externally publishedYes

Keywords

  • Internal molecular transport
  • Mesocellular silica foams
  • Oxidative hydrogenation of propane
  • Propylene
  • Supported vanadia catalyst

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