Jump to main content
Jump to site search


Structural characterization of vanadium environments in MCM-41 molecular sieve catalysts by solid state 51V NMR

Author affiliations

Abstract

The structure of vanadium oxide (VOx) species in vanadium containing MCM-41 catalysts prepared by co-condensation or grafting, respectively, was investigated by a combination of Raman scattering, UV-vis diffuse reflectance, ATR-IR, and magic angle spinning (MAS) 51V as well as 29Si NMR spectroscopy techniques. Simulations of the 51V MAS NMR spectra allowed the determination of chemical shift and quadrupole tensor parameters, which give valuable information about the nature of the VOx units. Structural transformations of the supported vanadium oxide species for the catalyst in the dehydrated state and hydrated state were investigated to examine the effect of water molecules on the VOx structures. The results reveal the presence of different VOx structures for the hydrated samples, including dimeric species, oligomeric chains and isolated trigonal pyramid units. Upon dehydration, the predominance of oligomeric and/or dimeric units for the sample prepared by grafting was observed, while a considerable amount of isolated units was additionally detected for the sample prepared by co-condensation.

Graphical abstract: Structural characterization of vanadium environments in MCM-41 molecular sieve catalysts by solid state 51V NMR

Back to tab navigation

Supplementary files

Publication details

The article was received on 16 Jul 2019, accepted on 27 Sep 2019 and first published on 30 Sep 2019


Article type: Paper
DOI: 10.1039/C9CY01410A
Catal. Sci. Technol., 2019, Advance Article

  •   Request permissions

    Structural characterization of vanadium environments in MCM-41 molecular sieve catalysts by solid state 51V NMR

    M. de Oliveira, D. Seeburg, J. Weiß, S. Wohlrab, G. Buntkowsky, U. Bentrup and T. Gutmann, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY01410A

Search articles by author

Spotlight

Advertisements