The adsorption data collected following dosing with 1.0 mmol/g of O2 or N2 could be satisfactorily fit (R 2 > 0.99) with a pseudo-first order rate law model using the Lagergren equation. Activation energies calculated using the Arrhenius equation are similar for O2 adsorption (Ea = 10(1) kJ/mol) and N2 adsorption (Ea = 12(1) kJ/mol) (Table and Figure ). Identical activation barriers were calculated using data collected under the most dilute dosing conditions (0.5 mmol/g; see Figure ). Diffusion time constants calculated from the kinetics data (see the Supporting Information for details) indicate that diffusion of N2 is more rapid than O2, which we attribute to a weaker N2 binding within the framework (Table and Figure ). The relatively large diffusion time constants are indicative of rapid diffusion kinetics facilitated by the large framework pores.