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RESEARCH PRODUCT
Sorption Kinetics of Benzene and p-Xylene on Template Supported Synthesized Gallosilicates
A. BrennerKlaus K. UngerAndrée BergmannPeter StruveMartin Bülowsubject
chemistry.chemical_compoundAdsorptionchemistryKineticsPhysical chemistryMoleculeOrganic chemistrySorptionMicroporous materialActivation energyBenzenep-Xylenedescription
Adsorption equilibria and kinetics of benzene and p-xylene on microporous gallosilicates (Ga-MFI) were measured piezometrically to ascertain the role of Ga in the system and to compare it with Ga-free MFI structures. The intracrystalline mobility of benzene follows a diffusional mechanism throughout the entire concentration range with an energy of activation that considerably exceeds that for the Ga-free species (78 kJmol−1 and 26 kJmol−1, respectively). For p-xylene, the kinetics indicate the existence of three sorption states. Sorbing species become highly immobile at a pore filling of ca n > 4 molecules per unit cell, i.e. in the range of concentration where isotherm hysteresis occurs. The immobilization of p-xylene molecules is stronger than previously found for Ga-free species.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-01-01 |