Si-29 and Al-27 NMR study of the thermal transformation of barium exchanged zeolite-A to celsian

Clayden, N. J., Esposito, S., Ferone, C. and Pansini, M. (2003) Si-29 and Al-27 NMR study of the thermal transformation of barium exchanged zeolite-A to celsian. Journal of Materials Chemistry, 13 (7). pp. 1681-1685. ISSN 0959-9428

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Abstract

The thermal transformation of Ba exchanged zeolite A to celsian has been studied by Al-27 and Si-29 MAS NMR spectroscopy. Evidence for the degradation of the zeolite framework is present in the Si-29 NMR spectra after thermal treatment at 200 degreesC. Confirmation is provided by the Si-29 NMR data that synthesis of celsian via the decomposition of Ba exchanged zeolite leads to a single phase. The Al-27 NMR data show distorted aluminium co-ordination sites upon the thermal transformation of Ba exchanged zeolite A. The distortions present in the amorphous matrix are greater than those present in the monoclinic and hexagonal crystalline phases of celsian. No evidence could be seen for significant amounts of nanometre scale crystalline domains in the amorphous matrix, prior to the crystallisation of monoclinic celsian.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
University of East Anglia > Faculty of Science > Research Groups > Physical and Analytical Chemistry
Depositing User: Rachel Smith
Date Deposited: 15 Jun 2011 11:46
Last Modified: 25 Jul 2018 07:05
URI: https://ueaeprints.uea.ac.uk/id/eprint/32500
DOI: 10.1039/b212717b

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