Abstract
The frequency response (FR) method has been applied to a study of the dynamics of NH3 adsorption in various ZSM-5 zeolites. Rate spectra have been recorded with samples differing in crystallite size, Si-to-Al ratio, and cationic composition. The effect of temperature and ammonia pressure has been examined. Independent of sorbent composition and measurement conditions, either macropore diffusion or soption was found to be the rate determining transport step. Diffusion control could be removed, leaving pure sorption rate spectra which have been used to characterize acid−base interactions. Under the quasi-equilibrium conditions of the measurements practically all of the sites examined are covered by the sorbate permitting rapid diffusional transport in the zeolitic micropores. The total and the relative amount of the different kinds of sites involved in the sorption processes have been shown to depend not only on sample characteristics but also on NH3 pressure and temperature. Both the frequency and the inte...
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