An antimony(V) substituted Keggin heteropolyacid, H 4PSbMo 11O 40: Why is its catalytic activity in oxidation reactions so different from that of H 4PVMo 11O 40?

Hila Goldberg, Devesh Kumar, G. Narahari Sastry, Gregory Leitus, Ronny Neumann

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

An antimony(V) containing α-Keggin type acidic polyoxometalate, H 4PSbMo 11O 40, was prepared by reacting NaMoO 4, H 3PO 4 and Sb 2O 3 in the presence of aqua regia to appraise its reactivity compared to the well known vanadate analog, H 4PVMo 11O 40. Characterization was by X-ray diffraction, MALDI-TOF MS, IR, UV-vis and 31P NMR spectroscopy. Catalytic redox reactions, such as oxidative dehydrogenation using O 2 and N 2O as terminal oxidants were studied and showed very different reactivity of H 4PSbMo 11O 40 versus H 4PVMo 11O 40. It was found by DFT calculations that in contrast to analogous H 4PVMo 11O 40 where vanadium centered catalysis is observed, in H 4PSbMo 11O 40 catalysis is molybdenum and not antimony centered.

Original languageEnglish
Pages (from-to)152-157
Number of pages6
JournalJournal of Molecular Catalysis A: Chemical
Volume356
DOIs
Publication statusPublished - Apr 1 2012

Keywords

  • Antimony
  • DFT
  • Molybdenum
  • Oxidation
  • Polyoxometalate

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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