Chemistry
Solid-state NMR strategies for characterizing high surface area niobates
Document Type
Article
Abstract
Layered niobates have been found to be strong solid-acid catalysts and have high surface areas while maintaining their crystalline structure. These materials can serve as model compounds for the metal environments at the surface of amorphous solid-acid niobates. The niobium environment in KCa2Nb3O10 and its acid exchanged version were studied using 93Nb solid-state NMR. As 93Nb is a quadrupolar nucleus, both the electric field gradient (EFG) and chemical shift anisotropy (CSA) for a given site can yield information about the symmetry of the local structure and relate its influence on the acid site. The change in the local environment of surface niobium sites upon acid exchange is observed via NMR and attributed to changes in the terminal niobium-oxygen bonds. © 2008 Elsevier B.V. All rights reserved.
Publication Title
Journal of Molecular Catalysis A: Chemical
Publication Date
2-18-2008
Volume
281
Issue
1-2
First Page
214
Last Page
218
ISSN
1381-1169
DOI
10.1016/j.molcata.2007.11.015
Keywords
Niobium oxide, nuclear magnetic resonance, solid acid
Repository Citation
Wang, Xuefeng and Smith, Luis J., "Solid-state NMR strategies for characterizing high surface area niobates" (2008). Chemistry. 58.
https://commons.clarku.edu/chemistry/58
