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

Published online by Cambridge University Press:  09 July 2018

J. Billingham ,
C. Breen  and
J. Yarwood
J. Billingham
Affiliation:
Materials Research Institute, Sheffield Hallam University, Pond Street, Sheffield S1 1 WB, UK
C. Breen
Affiliation:
Materials Research Institute, Sheffield Hallam University, Pond Street, Sheffield S1 1 WB, UK
J. Yarwood
Affiliation:
Materials Research Institute, Sheffield Hallam University, Pond Street, Sheffield S1 1 WB, UK
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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°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 Brønsted acid in benzene. However, this diagnostic band was significantly reduced in the presence of deuterated 1,4-dioxan.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 4 , December 1996 , pp. 513 - 522
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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