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.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry