Adsorption characteristics of octadecylsilyl‐silica gel in gaseous systems

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Abstract
Adsorption rates and thermodynamic parameters were determined for the gasphase adsorption of n‐alkanes and benzene derivatives on octadecylsilyl‐silica gel (ODS) by chromatographic measurement and moment analysis. Thermodynamic characteristics of adsorption phenomena on ODS were similar to those on the surface. The contribution of intraparticle diffusion to mass‐transport resistance was dominant in the ODS column, and the role of surface diffusion was significant for the intraparticle diffusion. The values of the surface diffusion coefficient were of the order of 10−5 cm2/s and could be estimated by assuming that the surface migration on ODS is a tracer diffusion of an adsorbate molecule in n‐octadecane.

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