Efficient separation of CO₂ from CH₄ and N₂ in an ultra-stable microporous metal–organic framework

Abstract

Efficient separation of CO2 from CH4 and N2 is essential for the upgrading of biogas and reducing carbon emissions in flue gas, but is challenging in the energy chemistry industry....

Halogen-Decorated Metal–Organic Frameworks for Efficient and Selective CO2 Capture, Separation, and Chemical Fixation with Epoxides under Mild Conditions

“…In sharp contrast to N 2 , the CO 2 adsorption exhibits type I isotherms for all the MOFs with an uptake amount of 5.34 mmol/g (119.7 cm 3 g –1 STP) for MOF 1 , 4.33 mmol/g (96.9 cm 3 g –1 STP) for MOF 2 , and 2.54 mmol/g (56.9 cm 3 g –1 STP) for MOF 3 at 195 K, and the BET surface area of 449, 408, and 253 m 2 /g, respectively. A similar phenomenon was also observed in the case of various reported functionalized MOFs. − Upon performing the CO 2 adsorption analysis at 273 K, the carbon dioxide uptake amount decreased to 2.12 mmol/g (47.5 cm 3 g –1 STP) for MOF 1 , 2.17 mmol/g (48.6 cm 3 g –1 STP) for MOF 2 , and 1.41 mmol/g (31.6 cm 3 g –1 STP) for MOF 3 , and at room temperature (298 K) the values were around 1.46 mmol/g (32.7 cm 3 g –1 STP) for MOF 1 , 1.62 mmol/g (36.3 cm 3 g –1 STP) for MOF 2 , and 0.88 mmol/g (19.7 cm 3 g –1 STP) for MOF 3 (Figure A–C). The higher CO 2 uptake values and higher surface areas can be credited to the presence of both halogen and carboxylate groups of the ligands.…”

A microporous bismuth-based MOF for efficient separation of acetylene from carbon dioxide

“…As significant classes of crystal porous solid materials, metal–organic frameworks (MOFs) or porous coordination polymers (PCPs) have appeared as promising materials for the separation of various gases. 13–19 MOFs have attracted particular attention because of their abundant structural diversity and design flexibility, providing remarkable sorption behavior. 20–25 In this regard, many microporous MOFs that can selectively take up acetylene from other gases that possess similar physical properties, such as carbon dioxide or ethylene, have recently been reported.…”

A (4,6)-c copper–organic framework constructed from triazole-inserted dicarboxylate linker with CO2 selective adsorption

“…4). Prominently, the CO 2 /N 2 selectivity of Cu-TZDB at 298 K is higher than many well-known MOF materials, such as SIFSIX-2-Cu-i 12 ( S = 140), HKUST-1 7 ( S = 101), ZJNU-29 35 (93.6), NJU-Bai21 36 ( S = 91), ZnMOF-74 37 (87.7), LIFM-11(Cu) 38 (81.9), FJUT-4 39 (69.3), UTSA-85a 40 (62.5), Y-bptc 41 (62), ZIF-78 9,37 (41.4), HNUST-1 42 ( S = 39.8), and SYSU 43 ( S = 34.2) etc. , slightly lower than Mg-MOF-74 16 ( S = 182.1), but still lower than some famous MOFs of SIFSIX-3-Zn 12 (1818), NJU-Bai52 44 ( S = 581), Zn 2 (bpdc) 2 (bpee) 45 ( S = 493.8), mmen-CuBTTri 14 ( S = 327), and UTSA-16 15 ( S = 314.7) (Table S2†).…”