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Vapor-Phase Sorption Kinetics for Methanol, Propan-2-OL, and 2-Methylpropan-2-OL on Al3+-, Cr3+-, and Fe3+-Exchanged Montmorillonite

Published online by Cambridge University Press:  02 April 2024

C. Breen ,
A. T. Deane ,
J. J. Flynn  and
D. Reynolds
C. Breen*
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Ireland
A. T. Deane
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Ireland
J. J. Flynn
Affiliation:
School of Chemical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Ireland
D. Reynolds
Affiliation:
School of Mathematical Sciences, National Institute for Higher Education, Glasnevin, Dublin 9, Ireland
*
1Current address: Chemistry Department, Sheffield City Polytechnic, Pond Street, Sheffield S1 1WB, United Kingdom.
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Abstract

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The rate of sorption of methanol (MeOH), propan-2-ol (i-PrOH), and 2-methyl-propan-2-ol (t-BuOH) onto a Wyoming montmorillonite saturated with Al3+-, Cr3+-, or Fe3+-cations has been studied by isothermal gravimetry in the temperature range 18°–105°C using samples of differing weights and grain-size distributions. The rate of sorption for all the alcohols increased with decreasing sample and grain size, demonstrating that inter-, rather than intraparticle mass transfer was the rate-limiting process. Optimization of the sample parameters (2 mg sample of < 45-μm grain size, pretreated at 120°C yielded integral diffusion coefficients at 18°C of 1.1 × 10−4 m2/s for t-BuOH for the Cr3+-form and 2.0 × 10−14 m2/s for MeOH and i-PrOH for the Al3+-form. In general, the rate of alcohol sorption decreased as MeOH ≥ i-PrOH > t-BuOH, but no temperature dependence of the sorption rate was observed. The alcohol sorption rate was dependent on the cation present, with Fe3+ < Cr3+ < Al3+.

Keywords

AdsorptionAlcoholDiffusionGrain sizeMass transferMontmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 5 , October 1987 , pp. 336 - 342
Copyright
Copyright © 1987, The Clay Minerals Society

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