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

BREEN, C. and MORONTA, A. J. (2001). Influence of exchange cation and layer charge on the isomerization of alpha-pinene over SWy-2, SAz-1 and Sap-Ca. Clay Minerals, 36 (4), 467-472.

Full text not available from this repository.
Link to published version:: 10.1180/0009855013640001

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 ion-exchanged clays was measured directly using the isomerization of alpha-pinene at 80degreesC for 2 h to yield camphene, limonene and other minor products. The order of activity for the different cation-exchanged 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.

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: 10.1180/0009855013640001
Depositing User: Jill Hazard
Date Deposited: 13 May 2010 09:34
Last Modified: 28 Sep 2010 17:12
URI: http://shura.shu.ac.uk/id/eprint/1849

Actions (login required)

View Item

Downloads

Downloads per month over past year

View more statistics