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Assessing and improving the catalytic activity of K-10 montmorillonite
journal contribution
posted on 2007-09-03, 00:00 authored by P J Wallis, Will GatesWill Gates, A F Patti, J L Scott, E TeohK-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.
History
Journal
Green ChemistryVolume
9Issue
9Pagination
980 - 986Publisher
Royal Society of ChemistryLocation
Cambridge, Eng.Publisher DOI
ISSN
1463-9262eISSN
1463-9270Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2007, Royal Society of ChemistryUsage metrics
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