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Issue 9, 2007
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Assessing and improving the catalytic activity of K-10 montmorillonite

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K-10 montmorillonite, commonly used as a heterogeneous acid catalyst, was found to vary in the extent of acid-treatment, with some batches exhibiting significantly reduced catalytic activity in Brønsted acid-catalysed reactions. K-10 was thus further treated with HCl of varying concentrations to increase its activity in acid-catalysed reactions. Acid-treated clays exhibited significant enhancements in catalytic activity in three test reactions; tetrahydropyranylation of ethanol, diacetylation of benzaldehyde and esterification of succinic anhydride. Acid-treatment of K-10 was shown to result in protonation, and loss of layer stacking of the clay structure, as determined by powder X-ray diffraction, inductively coupled plasma–optical emission spectroscopy (ICP-OES), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and Brunauer–Emmett–Teller (BET) specific surface area measurements. Quantifiable physical changes to the K-10 correlated with measurable increases in catalytic activity. Standard procedures for assessing acid-treated montmorillonite clay catalysts, such as K-10, and procedures for obtaining the most effective catalyst for acid-catalysed reactions, involving analytical and synthetic techniques, were devised.

Graphical abstract: Assessing and improving the catalytic activity of K-10 montmorillonite

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The article was received on 31 Jan 2007, accepted on 10 Apr 2007 and first published on 03 May 2007

Article type: Paper
DOI: 10.1039/B701504F
Citation: Green Chem., 2007,9, 980-986
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    Assessing and improving the catalytic activity of K-10 montmorillonite

    P. J. Wallis, W. P. Gates, A. F. Patti, J. L. Scott and E. Teoh, Green Chem., 2007, 9, 980
    DOI: 10.1039/B701504F

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