Grand canonical ensemble Monte Carlo simulations were applied to study the adsorption and separation of thiophene from binary and ternary mixtures of benzene and n-alkanes in nine types of zeolites. Adsorption of thiophene is important for removing sulfur from gasoline. The computed pure component adsorption isotherms are in good agreement with experimental results for FAU zeolites. The calculated Q st for thiophene in FAU were found to be 33−46 kJ/mol depending on uptake, in good agreement with the experimental data. The adsorption heats as a function of zeolite pore diameter suggest high thiophene affinity when the pore diameter is between 4.6 and 5 Å. Binary mixture simulations at two different compositions show that FER is very selective toward thiophene over benzene at 373 K. The thiophene selectivity shows a significant dependence on pore size in binary mixtures, and the smaller thiophene molecule can replace benzene at elevated pressures due to size entropy effects for some zeolites. For ternary mixtures of thiophene, benzene, and alkanes, the results show that the selectivity is low in AET, MWW, BOG, and FAU zeolites, while the presence of n-hexane has insignificant effects on the thiophene selectivity in FER and AEL zeolites.
The properties of benzene adsorbed in all-silica Y and NaY zeolites have been studied by grand canonical
Monte Carlo simulation. Biased particle insertions and deletions were implemented to allow the computation
of equilibrium adsorption isotherms of benzene. Isotherms of adsorption at different temperatures were
calculated and compared to the available experimental data. The calculated results show the amount adsorbed
of benzene in NaY is much more than that in all-silica Y at the given range of pressure. The calculated heat
of adsorption is in good agreement with experimental results. NaY preferentially adsorbs the benzene compared
to all-silica Y. A distribution analysis of the adsorbed phase structure reveals the adsorption site in the zeolites.
This work studied the effect of this relationship on the drug adsorption and delivery of pharmacological molecules. The GCMC has been performed in order to support the drug–matrix interactions in the pore of the material.
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