Evaluation of the thermodynamic parameters for the adsorption of some hydrocarbons on alumina and molecular sieves 3A and 5A by inverse gas chromatography

Inverse gas chromatography has been used to evaluate the adsorption parameters (deltaH, deltaS and deltaG) of some probes, each representing a class of organic compounds (n-hexane, cyclohexane and benzene) on some adsorbents (activated alumina, and molecular sieves 3A and 5A). It was found that benzene exhibits more negative deltaH than for n-hexane and cyclohexane on molecular sieves 3A and 5A and alumina. Also, interactions of the benzene with molecular sieves 3A and 5A were found to be stronger than that on alumina. On the contrary, interactions of the hexane with alumina were found to be stronger than those on molecular sieves 3A and 5A.