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51V NMR: A New Probe of Structure and Bonding in Catalysts

Published online by Cambridge University Press:  28 February 2011

Hellmut Eckert  and
Israel E. Wacjs
Hellmut Eckert
Affiliation:
Department of Chemistry, University of California at Santa Barbara, Goleta, CA 93106
Israel E. Wacjs
Affiliation:
Zettelmoyer Center for Surface Studies and Department of Chemical Engineering, Lehigh University, Bethlehem, PA 18015
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Abstract

Solid State 51V NMR spectra are sensitive to changes In the surface structure of V2O5 dispersed on Al2O3 and TiO2 supports. For V2O5 supported on alumina, wideline and magic-angle spinning experiments at 4.7 and 7.0 T reveal the presence of two vanadium species with different bonding environments. The relative proportions of these species change monotonically as a function of the vanadium concentration. In contrast, supported vanadium oxide on TiO2 substrates show a much more V2O5-like environment. Structural inferences are discussed In connection with solid state 51V NMR studies on model compounds with known crystal structures and site symmetries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 111: Symposium O – Microstructure and Properties of Catalysts , 1987 , 459
Copyright
Copyright © Materials Research Society 1988

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