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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

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Abstract:

SW y-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 α-pinene at 80°C for 2h 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. Catalysis 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 later charge of SAz-1 using Li fixation caused a significant improvement in the catalytic activity of the Al-exchanged reduced-charge SAz-1.

Keywords: ALPHA-PINENE; CATALYSIS; EXCHANGEABLE CATIONS; ION-EXCHANGED CLAYS

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/0009855013640001

Publication date: December 1, 2001

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