(587b) Hydroxy Metal-Organic Framework-Based Mixed Matrix Membranes Enabling Enhanced CO2 Capture and Hydrogen Purification

Membrane separation technology offers enormous energy- and cost-savings for molecular separations in chemical industries, complementing conventional thermally-driven approaches, such as distillation. However, current membranes face numerous challenges, primarily lying in Robeson upper bounds, i.e., tradeoffs between the separation productivity and selectivity. In this work, we demonstrate a new class of hydroxy metal-organic frameworks (MOFs)-based mixed matrix membranes, enabling high performance for applications including CO₂ capture and hydrogen purification, compatible with currentmembrane manufacturing processes. The mixed matrix membranes perform beyond present Robeson upper bounds with H₂ and CO₂ permeabilities of 907 and 650 Barrers, respectively, with H₂/CH₄ and CO₂/CH₄ selectivities of 45 and 32, respectively. The outstanding performance is attributed to the intimate interfacial interaction of hydroxy MOFs and carboxylic polyimide via intensive hydrogen bonds. This design principle provides a new approach to fabricating membranes for energy-efficient gas separations with enhanced performance and compatibility with state-of-the-art membrane manufacturing.