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. 2021 May 19;33(11):4035–4044. doi: 10.1021/acs.chemmater.1c00455

Figure 1.

Figure 1

(a) SEM image of the ZIF-8 membrane synthesized in this work. The inset is the cross-sectional view of the membrane. (b) H2/CH4 and (c) CO2/CH4 and CO2/N2 ideal selectivities and the corresponding change in the H2 (b) and CO2 (c) permeances from polycrystalline ZIF-8 membranes after heat treatment in air_1.0%H2O@300C for dwell times of 3–18 min. (d) H2/CH4 and CO2/CH4 ideal selectivities from heat-treated ZIF-8 membranes as a function of temperature in air_1.0%H2O for a treatment time of 10 min. (e) Change in the ideal selectivity after heat treatment in argon@360C for 10 min and air_6.2%H2O@300C for 3 min. All of the permeation data were collected at 25 °C and 1.4 bar.