Determination of the Acidity of Montmorillonite Pillared with Aluminum by IR Using Pyridine Adsorption
- 1 January 1992
- journal article
- research article
- Published by Taylor & Francis in Spectroscopy Letters
- Vol. 25 (1) , 23-30
- https://doi.org/10.1080/00387019208020753
Abstract
Spectroscopic studies of chemisorbed pyridine indicate that Na-montmorillonite which has been degassed at 200°C contains only Lewis acid sites. The reaction of Na-homoionic montmorillonite with Al polyoxycations generates pillared montmorillonite which is thermally stable up to 500°C. The pillaring process seems to enhance Lewis acid sites and generate Brönsted acid sites. Above 300°C pyridine is adsorbed mainly on Lewis centers.Keywords
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