Determination of heats of adsorption of hydrocarbons on a synthetic clay by gas-solid chromatography using a wall coated open tubular column approach

Heats of adsorption for a series of hydrocarbons on Laponite-RD clay were d etermined by two gas chromatographic methods. The first method was an exten sion of packed-column gas-solid chromatography. The second method employed a novel wall coated open tubular (WCOT) column that was prepared from clay aqueous suspensions. The two different methods of preparing chromatographic columns are discussed in this paper, and a comparison between the results obtained on the two systems is made. We conclude that the WCOT column metho d provides the same thermodynamic results as does the conventional packed-c olumn method, while offering some definite improvements in the measurement process and data behavior. (C) 1999 Published by Elsevier Science B.V. All rights reserved.