Pore environment engineering in metal–organic frameworks for efficient ethane/ethylene separation

Abstract

Methyl groups are introduced on the pore walls of a metal–organic framework to enhance the separation performance of C2H6/C2H4.

Capture and Separation of SO2 Traces in Metal–Organic Frameworks via Pre‐Synthetic Pore Environment Tailoring by Methyl Groups

“…Pore width [c] []S O 2 uptake (293 K) [mmol g À1 ]a t: SO 2 /CO 2 selectivity [d] at SO 2 /CO 2 molar ratio: 0.01 bar 0.1 bar 0.97 bar 0.01 0.1 0.5 DMOF [37] 2050 [39] /-0.80 [39] /-7.5, 5.6 6.9 [37][e] --9.97 (298) [17] - [39] 894 [39] /-0.39 [39] /-4.5 [39][e] --% 4.9 (298) [25] --- Angewandte Chemie (3.0 mmol g À1 ), and is only slightly lower than that of SIFSIX-2-Cu-i (4.16 mmol g À1 ) [31,40] and MIL-160 (4.2 mmol g À1 ). [31] Thel atter two feature polar groups (SiF 6 2À and af uran ring, respectively) together with optimal micropore widths of approximately % 5 (see below).…”

“… [37, 38] DMOFs with different metals and linkers, mixed metals, and mixed linkers, including BDC‐TM and Ni‐DMOF‐TM, were recently tested for SO 2 sorption with the focus on stability in humid conditions [25] . The addition of methyl groups to the BDC linker yields isostructural DMOFs [39] . The increased density of methyl groups in methyl‐functionalized DMOF‐X (X represents M, DM, and TM) is then correlated with the SO 2 adsorption and separation properties.…”

Efficient Separation of Acetylene and Carbon Dioxide in a Decorated Zeolite

“…Various porous materials, such as activated carbons, [8] silica [9] and metal‐organic frameworks (MOFs), [3, 10–19] have been studied for the adsorptive separation of C 2 H 2 /CO 2 . MOFs attracted particular attention because of their abundant structural diversity and design flexibility [20–24] . Zeolites, as conventional sorbent materials, [25, 26] are potentially superior to MOFs for gas separations at an industrial scale owing to their high hydrothermal stability, recyclability and low production cost.…”

Efficient Separation of Acetylene and Carbon Dioxide in a Decorated Zeolite

“…[4][5][6][7] Va rious porous materials,s uch as activated carbons, [8] silica [9] and metal-organic frameworks (MOFs), [3,[10][11][12][13][14][15][16][17][18][19] have been studied for the adsorptive separation of C 2 H 2 /CO 2 .M OFs attracted particular attention because of their abundant structural diversity and design flexibility. [20][21][22][23][24] Zeolites,a sc onventional sorbent materials, [25,26] are potentially superior to MOFs for gas separations at an industrial scale owing to their high hydrothermal stability,recyclability and low production cost. However,the separation of mixtures of C 2 H 2 /CO 2 in zeolites has not been achieved to date because physisorption of C 2 H 2 and CO 2 within pristine zeolites often exhibits similar uptakes and adsorption profiles,l eading to no apparent selectivity to afford any practical separation.…”