Inverse Gas Chromatography Study of Modified Smectite Surfaces

Teresa J. Bandosz, Jacek Jagiełło1, Brannon Andersen2 and James A. Schwarz
Department of Chemical Engineering and Materials Science, Syracuse University Syracuse, New York 13244-1190
2 Department of Geology, Heroy Geology Laboratory, Syracuse University
1 Permanent address: Institute of Energochemistry of Coal and Physicochemistry of Sorbents, University of Mining and Metallurgy, 30-059 Kraków, Poland.

Abstract: Inverse gas chromatography at infinite dilution, employing alkanes and alkenes as probes, has been used to characterize the surface properties of a series of smectites of varying chemical composition. The results of this study show that the acidic centers and the interlayer distances have a great influence on the specific interaction of the smectite surface with π-bonds of alkenes. High values of the specific interaction parameter, ɛπ, are caused by the existence of strong acidic centers that are connected with interlayer cations as well as with the chemical structure of the mineral sheets. On the other hand, alkanes, whose interaction with the smectites is predominantly dispersive, are unaffected by changes in the clays' composition and/or structure.

Key Words: Smectite • Intercalation • Inverse gas chromatography • Alkane and alkene sorption • Surface acidity • Surface energy

Clays and Clay Minerals; June 1992 v. 40; no. 3; p. 306-310; DOI: 10.1346/CCMN.1992.0400309
© 1992, The Clay Minerals Society
Clay Minerals Society (www.clays.org)