The liquid-phase adsorption of C 5 - C 22 linear alkanes on ZSM-5 was studied using a batch adsorption technique. Saturation capacities of the alkanes depend strongly on the chain length. The number of −CH x groups adsorbed per unit cell drops steeply between C 7 and C 8 and then increases steadily to reach a plateau of 53−54 for C 14 −C 22 . In this plateau region, the pores of ZSM-5 are densely packed with alkane molecules. The mechanisms of packing in liquid-phase adsorption were studied using configurational-bias grand canonical Monte Carlo simulations. These simulations revealed that the probability of bending and crossing in the intersections increases with chain length, explaining the very good packing of long-chain alkanes. Short alkanes tend to stay away from the intersections, resulting in a lower packing density.
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Meyer et al. (2003) studied this question.
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