We construct an adsorption model for each MOF on the basis of experimentally measured, pure-component CH 4 , CO 2 , C 2 H 6 , and N 2 adsorption data at or near 298 K. Fig. displays the adsorption isotherms and Tab. 1 provides the references. We invoke ideal adsorbed solution theory (IAST) and use pyIAST to implement the adsorption function a(x). Sec. 2.1 explains that a(x) gives the total mass of gas adsorbed in each MOF [g/g] of the array as a function of the gas composition described by x. IAST is a thermodynamic framework to predict mixed-gas adsorption from pure-component adsorption isotherms. Fig. shows the pure-component adsorption isotherm models fit to the experimental adsorption data and used as input for IAST calculations; the single-site Langmuir, dualsite (DS) Langmuir, and quadratic adsorption isotherm models fit the data well. N.b., though we write m = a(x), the adsorption model for each MOF in the array is independent; IAST provides m i = a i (x) for each MOF in the array independently.