Acidity and location of cations (H+, Na+) in HEMT and NaEMT determined using benzene adsorption
- 1 January 1993
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 89 (5) , 857-862
- https://doi.org/10.1039/ft9938900857
Abstract
Infrared spectroscopy is used to characterize the hydroxyls of HEMT and the interactions with benzene of these hydroxyls and of Na+ cations in NaEMT. Benzene adsorption studies reveal that HEMT is a stronger solid acid than HY or HSAPO-37 and that ca. 55–65% of the theoretical protons are still present after evacuation at 773 K. The changes with loading of the CH out-of-plane vibration of the adsorbed benzene give access to the number of interaction sites (H+ or Na+). In NaEMT all the cations are accessible to benzene. This may result from Na+ ion migration towards the large cages in the presence of the aromatic.Keywords
This publication has 0 references indexed in Scilit: