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| - Assessment and Modeling of Adsorption Selectivities in the Transport ofMixtures of Hydrocarbons in FCC Catalysts
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| - Adsorption experiments with up to 10 s contact time in a batch adsorber with a ternary mixture of hexane,decane, and toluene at 250 °C and a binary mixture of hexane and 1-hexene at 160 °C were used to assessequilibrium and apparent adsorption selectivities and diffusion selectivities in an equilibrium commercialFCC catalyst, and to confirm the predictions of a zeolite diffusion−adsorption model based on the Maxwell−Stefan formulation in combination with an isotherm according to the ideal adsorbed solution theory (IAST).Hexane was the reference hydrocarbon, and the decane and toluene apparent selectivities observed in themixture were higher than those of the individual cases. The predictions of the apparent adsorption selectivitieswere close to the experimental values and higher than those for diluted conditions. The stronger adsorptionof decane and the interactions between the various species within the zeolite particles contributed positivelyto decane overall transport in comparison to the other hydrocarbons in the mixture. Such interaction effectscan be clearly visualized in the simulation of the transient adsorbate concentration profiles inside the zeoliteparticles. A similar behavior was observed in the case of the olefin in the hexane/hexene mixture.
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