Selective modification of surface and bulk V5+/V4+ ratios and its effects on the catalytic performance of Mo{single bond}V{single bond}Te{single bond}O catalysts

Yihan Zhu, Weimin Lu*, Han Li, Huilin Wan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Selective modification of surface and bulk V5+/V4+ ratios in Mo{single bond}V{single bond}Te{single bond}O catalysts has been achieved using nitric acid and saturated ammonia solutions as pH adjustors. The addition of nitric acid strongly suppressed V4+ in the bulk but encouraged it on the surface. Because the bulk-phase compositions of Mo{single bond}V{single bond}Te{single bond}O catalysts varied only slightly, the changes in the catalytic performance for selective propane oxidation to acrolein resulted mainly from the variation of the bulk and surface V5+/V4+ ratios. The high concentration of surface V5+ that was responsible for propane activation led to high selectivity of propylene and high conversion of propane. Increased bulk V4+ might result in oxygen vacancies, which promote the electron and oxygen transfer so as to increase the selectivity of deep oxidation products (COx). A low bulk V4+ concentration prefers selective oxidation products; the yield of acrolein was as high as 21.4%.

Original languageEnglish (US)
Pages (from-to)382-389
Number of pages8
JournalJournal of Catalysis
Volume246
Issue number2
DOIs
StatePublished - Mar 10 2007

Keywords

  • Acrolein
  • Mo{single bond}V{single bond}Te{single bond}O catalysts
  • Propane
  • Selective oxidation
  • Surface and bulk
  • V/V ratio

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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