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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 pro- cess. 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 adsorp- tion of both gases were smaller than the heats of total adsorption. The interaction energy of N2O with mordenite was larger than the interac- tion energies of N2O with either erionite or clinoptilolite. The interac- tion energy of NO was found to be largest with erionite.

Isosteric Heats of Adsorption of N2O and NO on Natural Zeolites