Journal
OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
Volume 61, Issue 4, Pages 561-569Publisher
EDP SCIENCES S A
DOI: 10.2516/ogst:2006025a
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Adsorption of molecules in ordered microporous solids involves specific energetic and entropic effects. The molecular stacking in such confined spaces leads to selectivities different from those observed on traditional mesoporous or amorphous materials. Examples of packing and entropic effects in hydrocarbon adsorption on zeolites are presented. Rotational entropy driven separation of n-/iso-alkane mixtures in zeolite MCM-22, inverse shape selectivity in SAPO-5, chain length induced selectivity reversal in ZSM-5 and stacking effects in the liquid phase separation of alkane/alkene mixtures on Faujasites are discussed. It is shown that entropy induced selectivity effects in the adsorption of alkane mixtures affect selectivity and isomer yield in hydro-isomerisation processes.
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