Title

Xenon-129 NMR Study of TiO2 (Anatase)-Supported V2O5 Catalysts

Document Type

Article

Publication Date

10-1994

Abstract

TiC>2 (anatase), V2O5, and V2(VTi02 (anatase) catalysts with 1.3%, 3.0%, and 9.8% weight loadings of V2O5 have been studied using temperature-dependent xenon-129 NMR spectroscopy. The intrinsic chemical shift values due to the interaction of xenon with the surface are 109 ± 3 ppm for TiC>2 (anatase) and 93 ± 5 ppm for V2O5. The ViQsTYiOi catalysts provide strong adsorption sites for xenon which cause an initial decrease of the chemical shift values at low xenon loadings. Additionally, the spectra of pure V2O5 reveal two distinct environments for the xenon atoms, consistent with the hysteresis of the isotherm and the existence of pores. Two-dimensional exchange spectroscopy was used to measure the rates and activation energy of xenon moving between these two environments.

Publication Title

Journal of Physical Chemistry

Volume

98

Issue

40

First Page

10173

Last Page

10179

DOI of Published Version

10.1021/j100091a037

Link to Full Text
COinS