Equilibrium Adsorption Isotherms of Pure N 2 and O 2 and Their Binary Mixtures on LiLSX Zeolite: Experimental Data and Thermodynamic Analysis

An isothermal–isobaric column dynamic test apparatus was built to measure equilibrium adsorption isotherms of pure N 2 and O 2 and their binary mixtures at 0, 30, and 65 °C in the pressure range of 0–6 atm on LiLSX zeolite. The data successfully passed an integral and a differential thermodynamic consistency test between pure and binary gas isotherms. The binary selectivities of N 2 over O 2 were functions of the gas-phase mole fraction and pressure, and the pure gas isosteric heats of adsorption decreased with increased loadings. Thus, the adsorbent was energetically heterogeneous for both gases. The degree of heterogeneity for N 2 was larger than that for O 2 .