SOLID-STATE H-1-NMR STUDIES OF THE ACIDITY OF MORDENITES

Authors
HEERIBOUT L SEMMER V BATAMACK P DOREMIEUXMORIN C FRAISSARD J ANTOS G
Citation
L. Heeribout et al., SOLID-STATE H-1-NMR STUDIES OF THE ACIDITY OF MORDENITES, Journal of the Chemical Society. Faraday transactions, 91(21), 1995, pp. 3933-3939
Citations number
49
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Journal title
Journal of the Chemical Society. Faraday transactions → ACNP
ISSN journal
09565000
Volume
91
Issue
21
Year of publication
1995
Pages
3933 - 3939
Database
ISI
SICI code
0956-5000(1995)91:21<3933:SHSOTA>2.0.ZU;2-F
Abstract
The interaction of known numbers of water molecules with the acidic OH groups of H-form commercial mordenites, giving H3O+ and H2O ... HO, i s studied using H-1 broad-line NMR at 4 K and MAS NMR at 300 K. The H3 O+ concentration for one adsorbed water molecule per Bronsted-acid sit e is related to the Si/Al ratio. The differences between the H3O+ conc entrations for the two samples at a higher water concentration is asso ciated, semi-quantitatively, with synergy between Bronsted- and Lewis- acid sites.