The diffusion and adsorption of methanol and benzene in various zeolite pellets were studied experimentally by using the single pellet moment technique. The experiments were conducted in a one-sided single pellet adsorption cell at different temperatures between 303 and 343K. The results showed that both volatile organic tracers were adsorbed reversibly onto all zeolite samples. The overall adsorption equilibrium constants of both volatile organic compounds decreased with increasing temperature. The adsorption of the tracers onto the zeolite samples were found to increase in the order of NaY < clinoptilolite < 4A. In the range between 303 and 343K, the adsorption constants of benzene ranged from 10.51 to 5.52 for zeolite 4A, from 11.90 to 6.37 for clinoptilolite and from 20.32 to 9.82 for NaY. The adsorption constants of methanol ranged from 19.05 to 8.26 for zeolite 4A, from 38.40 to 9.12 for clinoptilolite and from 74.21 to 14.70 for NaY at between 303 and 333K. The effective diffusivities for benzene varied from 2.20 x 10-6 to 13.01 x 10-6m2/s, whereas for methanol, they varied from 9.80 x 10-6 to 15.60 x 10-6m2/s at the temperatures studied.

Analysis of Diffusion and Adsorption of Volatile Organic Compounds in Zeolites by a Single Pellet Moment Technique. C.Akosman, M.Kalender: Clean - Soil, Air, Water, 2009, 37[2], 115-21