Abstract
Reversed-flow gas chromatography can be used to test solid catalysts with respect to their adsorptive and reactive properties, thus facilitating their design. The method uses a slightly modified gas chromatograph, by means of which diffusion bands are obtained when plotting the logarithm of the height of the extra “sample peaks”, created by the flow reversals, as a function of time. In the presence of a catalyst, the diffusion bands are distorted because of slow rate processes and/or equilibrium states occuring in the catalyst's bed. Mathematical equations have been derived, by means of which the distorted diffusion bands are analyzed to yield rate constants, distribution coefficients, and overall mass transfer coefficients.
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