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Diffusivity was studied simultaneously by gravimetric and ZLC techniques. Adsorption isotherms were satisfactorily described by a localized adsorption model developed by Nitta et al. (1984) with only one temperature\u2010dependent parameter (coefficient of Henry's law). The isosteric heat of adsorption is 14.2 kcal\/mol.Kinetic data clearly show that macropore diffusion is the controlling mass\u2010transfer mechanism. Between 473 and 573 K, pore diffusivities range from 0.11 to 0.13 cm<jats:sup>2<\/jats:sup>\/s in the system He\u2010nC<jats:sub>6<\/jats:sub>, and from 0.06 to 0.08 cm<jats:sup>2<\/jats:sup>\/s in the system N<jats:sub>2<\/jats:sub>C<jats:sub>6<\/jats:sub>. The effect of partial pressure of sorbate, temperature, and total flow rate in the behavior of the fixed\u2010bed unit is shown. A simple mathematical model with equilibrium and diffusivity parameters obtained in this work predicts with good accuracy all fixed\u2010bed adsorption experiments.<\/jats:p>","DOI":"10.1002\/aic.690431014","type":"journal-article","created":{"date-parts":[[2004,6,23]],"date-time":"2004-06-23T06:36:48Z","timestamp":1087972608000},"page":"2524-2534","source":"Crossref","is-referenced-by-count":61,"title":["Equilibrium and kinetics of<i>n<\/i>\u2013 hexane sorption in pellets of 5A zeolite"],"prefix":"10.1002","volume":"43","author":[{"given":"Jos\u00e9 A. 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