Abstract
The production of high-purity ethylene requires an adsorbent with high C2H6/C2H4 selectivity, outstanding C2H6 adsorption, and facile C2H6 regeneration. Towards this goal, a series of novel defective CF3-functionalized metal–organic framework (MOF) materials (UiO-66-nCF3, n = 25, 50, 60, and 75) were synthesized by co-assembling the framework with terephthalic acid as the linker and various percentages (n) of CF3-functionalized ligands. The C2H6 adsorption strength increased as the density of CF3 groups increased. In particular, UiO-66-50CF3 exhibited high C2H6/C2H4 selectivity (2.04), excellent C2H6 adsorption (2.5 mmol/g), and modest C2H6 isosteric heat of adsorption (Qst) (∼28.9 kJ/mol). Additionally, the material exhibited high C2H6/C2H4 breakthrough selectivity (1.64) and large high-purity (>99.9 %) C2H4 productivity (7.32 LSTP kg−1) under dynamic flow conditions (C2H6/C2H4 = 1:15 (v/v)). UiO-66-50CF3 could readily be regenerated at room temperature, and demonstrated good hydrothermal stability in boiling water for 1 h and high thermal stability up to 500 °C. The incorporation of a high density of CF3 groups within a MOF via fragmented linker co-assembly is a promising strategy for developing adsorbents for C2H6/C2H4 separation.
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