Figure 4.

Adsorption isotherms of xylene isomers as (a) single components (total loading mixture is the sum of the loadings of xylenes from the mixture at chemical equilibrium) and (b) a mixture at chemical equilibrium in FAU-type zeolites at 523 K. (c) Mole fractions of xylene isomers as a function of total pressure for the mixture at chemical equilibrium adsorbed in the FAU-type zeolite and for the bulk phase. The composition in the bulk phase follows from Figure 1a. (d) Changes in enthalpy ΔH_tr,i and entropy TΔS_tr,i at 523 K due to the transfer of xylene i from the fluid-phase mixture at chemical equilibrium to the FAU-type zeolite at 0.3 and 30 bar. (e) Typical snapshot of the simulation of adsorption of the mixture of xylene isomers in FAU-type zeolites at 523 K and 300 bar. m-Xylene is shown in blue, p-xylene in gray, and o-xylene in orange. The snapshot shows how several xylenes are hosted in the cages of FAU-type zeolites.