The adsorption equilibria of ammonia gas on various inorganic and organic sorbents were determined at
298.15 K in a pressure range of 0−101 kPa using a static volumetric apparatus. The zeolite sorbents
were 4A, 5A, 13X, dealuminated faujasite, dealuminated pentasil, and clinoptilolite. To illustrate the
differences between commercial grades, the 5A and 13X zeolites were obtained from three suppliers.
Other inorganic sorbents were three aluminas and three silica gels. Organic sorbents were two activated
carbons, charcoal, and two polymeric sorbents (sulfonated and nonsulfonated). The nonlinear experimental
equilibrium data were fitted to the Langmuir, Freundlich, Langmuir−Freundlich, and Toth isotherm
models. The Henry model was used for the linear equilibrium data. The equilibria of all of the sorbents,
with the exception of sulfonated polymeric and dealuminated pentasil zeolite sorbents, provide an accurate
correlation with the isotherm models over the entire pressure range.
Adsorption equilibrium isotherms of ammonia gas were measured at temperatures between 298 and 393 K on 13X zeolite, 4A zeolite, alumina, silica gel, and
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