Metal‐organic framework membrane process for high purity CO₂ production

Abstract

SignificanceGas separation by metal-organic framework (MOF) membranes is an emerging research field. Their commercial application potential is, however, still rarely explored due in part to unsatisfied separation characteristics and difficulty in finding suitable applications. Herein, we report "sharp molecular sieving" properties of high quality isoreticular MOF-1 (IRMOF-1) membrane for CO 2 separation from dry, CO 2 enriched CO 2 /CH 4 , and CO 2 /N 2 mixtures. The IRMOF-1 membranes exhibit CO 2 /CH 4 and CO 2 /N 2 separation factors of 328 and 410 with CO 2 permeance of 2.55 3 10 27 and 2.06 3 10 27 mol m 22 s 21 Pa 21 at feed pressure of 505 kPa and 298 K, respectively. High grade CO 2 is efficiently produced from the industrial or lower grade CO 2 feed gas by this MOF membrane separation process. The demonstrated "sharp molecular sieving" properties of the MOF membranes and their potential application in production of valueadded high purity CO 2 should bring new research and development interest in this field.

Two‐Dimensional Materials as Prospective Scaffolds for Mixed‐Matrix Membrane‐Based CO2 Separation

“…The intrinsic advantage of MOF materials is their adjustable cavities in terms of porosities and functionalities as the struts for the assembly of architectures can be rationally designed and turned through conventional organic techniques. Thus, the use of MOFs as fillers for the construction of MMMs offers significant advantages over other porous materials and has the promise of giving a breakthrough in selective carbon capture . Serval recent interesting reviews have minutely highlighted the advances in the synthesis of “task‐specific” MOF‐based MMMs for CO 2 separation .…”

New frontiers for the materials genome initiative

“…Understand separations of multicomponent mixtures. Modern computation and data-driven approaches in chemical separations have been primarily applied to the adsorption of binary mixtures (e.g., xenon/krypton, carbon dioxide/nitrogen, and ethane/ethylene) [110][111][112][113] in crystalline sorbents (assuming rigid structures for zeolites and MOFs). However, most separations involve additional compounds in smaller mole fractions.…”

Mass transport through metal organic framework membranes

“…It is more complicated in the transport process of mixed gases [138,139]. When it was in the low or moderate CO 2 partial pressures, the diffusion rate of CO 2 decreased due to the adsorption, while the other gas permeance demonstrated inconspicuous decrease.…”