Abstract
The surface characterization of MgY and NH 4Y zeolites was performed using inverse gas chromatography (IGC). The adsorption thermodynamic parameters (the standard enthalpy (Δ H°), standard entropy change (Δ S°), and free energy change of adsorption (Δ G°), the dispersive component of the surface free energies ( γ S d ), and the acid–base character of the surface of MgY and NH 4Y zeolites were estimated using the retention time of different non-polar and polar probes at infinite dilution region. The specific free energy of adsorption (Δ G sp), the specific enthalpy of adsorption (Δ H sp), and the specific entropy of adsorption (Δ S sp) of polar probes on MgY and NH 4Y zeolites were determined. The values of the Δ H sp were correlated with both the donor and acceptor numbers of the probes to quantify the acidic K A and the basic K D parameters of the zeolite surfaces. The values obtained for the K A and K D parameters indicated a basic character for the surface of MgY and NH 4Y zeolites.
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