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Influence of exchange cation and layer charge on the isomerization of α-pinene over SWy-2, SAz-1 and Sap-Ca

Published online by Cambridge University Press:  09 July 2018

C. Breen  and
A. J. Moronta
C. Breen*
Affiliation:
Materials Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK
A. J. Moronta
Affiliation:
Materials Research Institute, Sheffield Hallam University, Sheffield S1 1WB, UK
*
*E-mail: [email protected]
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Abstract

SWy-2 (Wyoming), Sap-Ca saponite (California) and SAz-1 (Cheto, Arizona) were exchanged with different cations (Al, Ni, Mg, Ca and Na). The catalytic activity of these ionexchanged clays was measured directly using the isomerization of α-pinene at 80°C for 2 h to yield camphene, limonene and other minor products. The order of activity for the different cationexchanged forms was Al > Ni > Mg > Ca > Na, which correlated well with the known polarizing power of these cations and the resulting interlayer acidity. Catalysts derived from Sap-Ca were the most active followed by SWy-2, with SAz-1 the least active by a considerable margin. The greater activity of Sap-Ca over SWy-2 was attributed to the high tetrahedral charge in the former. Reduction of the layer charge of SAz-1 using Li fixation caused a significant improvement in the catalytic activity of the Al-exchanged reduced-charge SAz-1.

Keywords

α-pineneion-exchanged claysexchangeable cationscatalysis
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 4 , December 2001 , pp. 467 - 472
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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Footnotes

†

Current address: Centro de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, P.O. Box 15251, Maracaibo 4003A, Venezuela

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