Influence of layer charge on the catalytic activity of mildly acid-activated tetramethylammonium-exchanged bentonites

BREEN, C. and MORONTA, A. (1999). Influence of layer charge on the catalytic activity of mildly acid-activated tetramethylammonium-exchanged bentonites. The Journal of Physical Chemistry B, 103 (27), 5675-5680.

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Abstract

SWy-2 (Wyoming), STx-1 (Texas), and SAz-1 (Cheto, Arizona) montmorillonite and Sap-Ca saponite (California) were treated with different amounts of 12 M HCl and 1 M tetramethylammonium (TMA(+)) chloride solution at room temperature. The catalytic activity of these hybrid acid-activated organoclays (AAOCs) was directly measured using the isomerization of alpha-pinene at 120 degrees C for 1 h to yield camphene, limonene, and other minor products and compared to clays acid-treated in the absence of TMA(+) cations. The total conversion for the isomerization of cc-pinene was excellent for AAOCs formed from SWy-2 (88%) and STx-1 (73%), moderate for Sap-Ca (50%), and low for SAz-1 (20%). Samples treated with TMA(+) alone did not exhibit any marked catalytic activity. Acid-treated Sap-Ca and STx-1, which contained no TMA(+) cations were also effective catalysts for the isomerization process. TMA(+) cations were unexpectedly resistant to exchange by protons.

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:	10.1021/jp9901646
Depositing User:	Jill Hazard
Date Deposited:	14 May 2010 12:12
Last Modified:	28 Sep 2010 17:12
URI:	http://shura.shu.ac.uk/id/eprint/1847

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