Characterization of moderately acid-treated, size-fractionated montmorillonites using IR and MAS NMR-spectroscopy and thermal-analysis

BREEN, C., MADEJOVA, J. and KOMADEL, P. (1995). Characterization of moderately acid-treated, size-fractionated montmorillonites using IR and MAS NMR-spectroscopy and thermal-analysis. Journal of Materials Chemistry, 5 (3), 469-474.

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Link to published version:: 10.1039/JM9950500469

Abstract

The <2 mu m fractions of Cheto (Arizona, USA) and Jelsovy Potok (Slovakia) montmorillonites have been treated with 1 mol dm(-3) H2SO(4) for periods up to 6h at 95 degrees C. The materials obtained were investigated by X-ray fluorescence (XRF), X-ray diffraction (XRD), infrared (IR) spectroscopy, and Si-29 and Al-27 magic-angle spinning (MAS) NMR spectroscopy. Both clays were partially decomposed under the conditions utilized, but the Cheto montmorillonite, which contained a higher proportion of octahedral magnesium, was more susceptible to acid attack. XRD was insensitive to this level of acid attack but XRF, IR and Si-29 MAS NMR revealed the depopulation of the octahedral sheet. The number of acid sites was determined from the thermal desorption of cyclohexylamine and the catalytic activity was evaluated by reacting 2,3-dihydropyran with methanol to yield the tetrahydropyranyl ether. The test reaction was a more sensitive indicator of changes in clay acidity than the values determined by desorption of cyclohexylamine from acid sites.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
Identification Number: 10.1039/JM9950500469
Depositing User: Jill Hazard
Date Deposited: 14 May 2010 12:28
Last Modified: 28 Sep 2010 17:12
URI: http://shura.shu.ac.uk/id/eprint/1845

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