Abstract

DOMINGUEZ, Gerardo; HERNANDEZ-HUESCA, Rosario  and  AGUILAR-ARMENTA, Gelacio. Isosteric Heats of Adsorption of N₂O and NO on Natural Zeolites. J. Mex. Chem. Soc [online]. 2010, vol.54, n.2, pp.111-116. ISSN 1870-249X.

We studied the capacities of three natural zeolites to adsorb N₂O or NO using a glass high-vacuum volumetric system that permitted characterization of the energetics of the adsorption process. Adsorption equilibrium data were analyzed using the classical Freundlich equation and the Dual-Langmuir model. We employed the Clausius-Clapeyron relationship to calculate the isosteric heats of adsorption using the equilibrium data of the isotherms measured at 273.15 K and 293.15 K. The isosteric heats of reversible adsorption of both gases were smaller than the heats of total adsorption. The interaction energy of N₂O with mordenite was larger than the interaction energies of N₂O with either erionite or clinoptilolite. The interaction energy of NO was found to be largest with erionite.

Keywords : Adsorption; NOx; isosteric heats; natural zeolites.

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