Abstract
Commercial zeolite 5A and 13X adsorbents were characterized by their dynamic N2 and O2 adsorption properties. Frequency-response (FR) sorption rate spectra were determined between −78 to −20 °C and 100–600 Pa equilibrium pressures. In zeolite particles, smaller than about 63 μm the interaction of the gas molecules and the sorption sites determined the rate of the adsorption-desorption process. In particles, larger than 0.2-mm size, the rate of diffusion in the meso-and macro-pores governed the rate of sorption. Zeolite pellets, obtained from various commercial sources, showed comparable inter-crystalline diffusivities. In general, the FR spectra reflected the variance in the chemical and structural properties of the zeolite crystallites and their agglomerates.
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