Abstract
Zeolite-like metal organic framework (ZMOF) materials having rho and sod topologies were experimentally investigated as CO 2 adsorbents for the first time. As-prepared ZMOF materials showed reasonably high CO 2 adsorption capacities (ca. 51 and 53 mg/g adsorbent for rho-and sod-ZMOF, respectively) and high CO 2/N 2 selectivity (>20) at 298 K and 1 bar. The latter showed a higher heat of adsorption (27–45 kJ/mol). These ZMOFs exhibited better CO 2 adsorption than ZIF-8, a commonly investigated zeolitic imidazolate framework (ZIF) material having the same sod topology but in a neutral framework. Partially ion-exchanged sod-ZMOFs by alkali-metals resulted in improved CO 2 adsorption performance compared with the as-prepared ZMOF. The highest CO 2 adsorption was obtained with K +-exchanged sod-ZMOF (61 mg/g adsorbent), representing a ca. 15% increase in adsorption capacity. Complete desorption of CO 2 in the K +- sod-ZMOF was attained at mild conditions (40 °C, He purging), and reversible and sustainable CO 2 adsorption performance was demonstrated in 5 sets of recycling runs.
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