Table 2. Apparent activation energies calculated from an Arrhenius plot of the natural logarithm of the permeance values as a function of the inverse of temperature in the 35–150 °C range for the single and double-layered ZIF membranes (see Fig. S8).

	E a,H2/kJ mol–1	E a,CO2/kJ mol–1
ZIF-8/ZIF-9@P84	18.1	12.2
ZIF-67/ZIF-9@P84	16.3	11.4
ZIF-9@P84	13.7	8.8
ZIF-8@P84	16.2	10.6