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Catalysis Letters

, Volume 27, Issue 1–2, pp 187–197 | Cite as

17O NMR determination of proton sites in solid heteropoly acid H3PW12O40.31P,29Si and17O NMR, FT-IR and XRD study of H3PW12O40 and H4SiW12O40 supported on carbon

  • I. V. Kozhevnikov
  • A. Sinnema
  • R. J. J. Jansen
  • H. van Bekkum
Article

Abstract

17O MAS NMR spectra for solid heteropoly acid (HPA) H3PW12O40 are reported. Comparison of solid-state and solution17O resonances shows that in the solid dehydrated H3PW12O40 terminal W=O oxygen atoms are the predominant protonation sites. H3PW12O40 and H4SiW12O40 supported on chemically activated carbon have been studied by means of NMR, FT-IR and XRD. The carbon-supported HPA's retain their Keggin structure and form finely dispersed HPA species. No HPA crystal phase is developed even at an HPA loading as high as 45 wt%.31P,29Si and17O MAS NMR spectra for bulk and carbon-supported HPA's indicate interaction of the HPA Keggin units with the carbon surface, causing large line broadening in the NMR spectra.

Keywords

tungsten heteropoly acids determination of proton sites heteropoly acids supported on carbon 31P29Si and17O MAS NMR FT-IR XRD 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1994

Authors and Affiliations

  • I. V. Kozhevnikov
    • 1
  • A. Sinnema
    • 2
  • R. J. J. Jansen
    • 2
  • H. van Bekkum
    • 2
  1. 1.Boreskov Institute of CatalysisNovosibirskRussia
  2. 2.Laboratory of Organic Chemistry and CatalysisDelft University of TechnologyBL DelftThe Netherlands

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