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.
Full text not available from this repository.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 |
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Research Institute, Centre or Group - Does NOT include content added after October 2018: | Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Polymers, Composites and Spectroscopy Group |
Page Range: | 513-522 |
Depositing User: | Jill Hazard |
Date Deposited: | 14 May 2010 14:35 |
Last Modified: | 18 Mar 2021 21:15 |
URI: | https://shura.shu.ac.uk/id/eprint/1827 |
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