In situ determination of Bronsted/Lewis acidity on cation-exchanged clay mineral surfaces by ATR-IR

BILLINGHAM, J., BREEN, C. and YARWOOD, J. (1996). In situ determination of Bronsted/Lewis acidity on cation-exchanged clay mineral surfaces by ATR-IR. Clay Minerals, 31 (4), 513-522.

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Abstract

Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy has been used to determine the nature of acid sites present in Na+-, Ni2+- and Al3+-exchanged montmorillonite using the diagnostic base, pyridine. The pyridine additions were performed in situ at 25 degrees C in the presence of liquid benzene or deuterated 1,4-dioxan to ascertain whether the acidity profile was influenced by the presence of either the non-polar or oxygenated solvent. Pyridine treated Ni2+-montmorillonite exhibited absorption bands characteristic of Lewis bound base in both benzene and deuterated 1,4-dioxan indicating that the Lewis acid sites were present at low temperature and were accessible in both solvents. The presence of a strong 1537 cm(-1) band in pyridine-saturated Al3+-montmorillonite confirmed that this clay acted as a Bronsted acid in benzene. However, this diagnostic band was significantly reduced in the presence of deuterated 1,4-dioxan.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
Depositing User: Jill Hazard
Date Deposited: 14 May 2010 15:35
Last Modified: 28 Sep 2010 17:12
URI: http://shura.shu.ac.uk/id/eprint/1827

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