The adsorption equilibrium, kinetics, and enthalpy of nitrous oxide adsorption on zeolites 4A and 13X were measured volumetrically at 194, 237 and 298K and gas pressure of up to 108kPa. It was found that zeolite 4A adsorbs more N2O than 13X in all of the conditions used. The Langmuir, Freundlich and Toth isotherm models were used to correlate the adsorption isotherms. The N2O diffusivity in these adsorbents at 298K was deduced from the adsorption kinetics uptake curves by using a simple micropore diffusion model. It was found that the average diffusivity values in zeolite 4A and 13X were 3.38·x 10-14 and 1.05·x 10-12m2/s, respectively. The heats of adsorption were between -33 and -21kJ/mol for zeolite 4A and -28 and -22kJ/mol for 13X, for adsorption loadings of between 0.5 and 3.5mmol/g.

Adsorption Equilibrium, Kinetics, and Enthalpy of N2O on Zeolite 4A and 13X. D.Saha, S.Deng: Journal of Chemical and Engineering Data, 2010, 55[9], 3312-7