Abstract
The influence of the degree of mixing on the qualitative and quantitative interpretation of TPD spectra is investigated by simulation of physicochemical processes occurring within TPD cells. A methodology for accounting for readsorption effects is also developed and utilized in the simulations. It is shown that, as a result of imperfect mixing conditions, peak temperatures shift to lower values. Computed values of the heat of adsorption and the preexponential factor of desorption are always less than the true values, which can be obtained only under conditions of perfect mixing. Errors introduced by the presence of axial concentration gradients are large when desorption follows first-order kinetics and significantly smaller when second-order desorption kinetics are followed. An experimental procedure accounting for mixing effects is proposed.
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