Abstract
A method is developed for determining the rate constant of slow diffusion and/or slow adsorption-desorption processes in gas chromatography. Rate-constant measurements have been performed by applying the method to the desorption of n-butane and trans-butene from an aluminium oxide surface modified with cerium trichloride. The kinetic feature of every desorption experiment in the systems studied is two distinct rate constants, which might be attributed to two kinds of active sites on the surface. The activation parameters of desorption corresponding to the two kinds of sites have been determined from Arrhenius plots.
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