(417e) Adsorption Equilibria and Kinetics of CO2, CH4, and N2 on Zeolite 13X up to 1 Mpa

Adsorption equilibria and kinetics of carbon dioxide, methane, and nitrogen on zeolite 13X were studied at (293, 308, and 323) K and pressure up to 1 MPa. The experimental data were measured by a high pressure volumetric system. The physical properties of zeolite 13X were analyzed by N₂ adsorption/desorption isotherms at 77K with automatic volumetric sorption analyzer. The preferential adsorption capacity of carbon dioxide on zeolite 13X was much higher than that of the other gases. Each experimental isotherm was correlated by the Langmuir and Sips and temperature dependent Sips models, and the deviation of each model was evaluated. The Sips model showed smaller deviation than the Langmuir model. Isosteric enthalpy of each component were evaluated by using the temperature dependent Sips model and presented along with surface loading. And it was analyzed and compared at 0.1 MPa range as well as 1.0 MPa range. Diffusion rate of each adsorptive on zeolite 13X were estimated by the isothermal and non-isothermal diffusion models. The non-isothermal model provided a theoretical model which can be used to determine the significance of thermal effects in a transient adsorption rate measurement and to analyze the uptake curves obtained when diffusion is too fast for the isothermal approximation to be valid. The adsorption kinetics of each component was compared at various conditions.