Highly CO<sub>2</sub> Selective Metal–Organic Framework Membranes with Favorable Coulombic Effect
Da‐Shiuan Chiou, Hyun Jung Yu, Ting‐Hsiang Hung, Qiang Lyu, Chung‐Kai Chang, Jong Suk Lee, Li‐Chiang Lin, Dun‐Yen Kang
Abstract
Abstract The topology and chemical functionality of metal–organic frameworks (MOFs) make them promising candidates for membrane gas separation; however, few meet the criteria for industrial applications, that is, selectivity of >30 for CO 2 /CH 4 and CO 2 /N 2 . This paper reports on a dense CAU‐10‐H MOF membrane that is exceptionally CO 2 ‐selective (ideal selectivity of 42 for CO 2 /N 2 and 95 for CO 2 /CH 4 ). The proposed membrane also achieves the highest CO 2 permeability (approximately 500 Barrer) among existing pure MOF membranes with CO 2 /CH 4 selectivity exceeding 30. State‐of‐the‐art atomistic simulations provide valuable insights into the outstanding separation performance of CAU‐10‐H at the molecular level. Adsorbent–adsorbate Coulombic interactions are identified as a crucial factor in the design of CO 2 ‐selective MOF membranes.