Constructing and finely tuning the CO₂ traps of stable and various-pore-containing MOFs towards highly selective CO₂ capture

Abstract

Finely tuning the CO2 traps of MOFs led to the formation of a novel MOF, NJU-Bai51, with highly selective CO2 adsorption and chemical stability.

Two comparable Ba-MOFs with similar linkers for enhanced CO2 capture and separation by introducing N-rich groups

“…S7), and the BET and Langmuir surface areas of MOF 2a are calculated to be 471 and 646 cm 2 Ág -1 , respectively. The total pore volume of MOF 2a is 0.268 cm 3 Ág -1 calculated by CO 2 isotherm (p/p 0 = 0.989), and the value is comparable with the total pore volume (0.256 cm 3 Ág -1 ) obtained by crystal structure [16][17][18][19]. At 273 and 298 K under 100 Pa, the CO 2 capture amount of MOF 2a is 101.01 and 55.08 cm 3 Ág -1 (Fig.…”

Pure-Supramolecular-Linker Approach to Highly Connected Metal–Organic Frameworks for CO2 Capture

“…At 298 K and 0.4 mbar, the CO 2 uptake of NJU-Bai53 (2.74 wt %/0.64 mmol g –1 ) is improved about 50 times compared with the corresponding value of NJU-Bai52 (0.057 wt %/0.013 mmol g –1 ), which enables NJU-Bai53 to capture CO 2 directly from air. The CO 2 uptake of NJU-Bai53 at 298 K and 0.4 mbar is even superior to those of many MOFs, such as mmen-CuBTTri (0.22 wt %), SIFSIX-2-Cu-i (0.30 wt %), MOF-Mg-74 (0.39 wt %), SIFSIX-3-Zn (0.57 wt %) and NJU-Bai51 (0.56 wt %), but still lower than those of SIFSIX-3-Cu (5.17 wt %), mmen-Mg 2 (dobpdc) (8.09 wt %), and en-Mg 2 (dobpdc) (11.07 wt %) (Table S6). Furthermore, at 298 K and 0.15 bar, it exhibits a substantially higher uptake (7.67 wt %/1.89 mmol g –1 ) compared to NJU-Bai52 (5.75 wt %/1.39 mmol g –1 ), which are also comparable to those of famous MOFs, such as Zn-MOF-74 (7.60 wt %), NJU-Bai7 (7.42 wt %), Cu-TDPAT (7.41 wt %), NJU-Bai35 (7.20 wt %), CuTATB-60 (5.8 wt %), and ZIF-78 (3.32 wt %).…”

“…The selectivity predicted by ideal adsorbed solution theory (IAST) from the experimental single-component isotherms based on CO 2 /N 2 (15/85) and CO 2 /CH 4 (50/50) mixture for NJU-Bai52 are 581 and 13.5, respectively. Its CO 2 /N 2 selectivity is much higher than those of MOFs such as NJU-Bai51 (545.7), mmen-CuBTTri (327), UTSA-16 (314.7), and Mg-MOF-74 (182.1). Notably, NJU-Bai53’s CO 2 /N 2 (0.4/800) selectivity at 298 K is 6397, which was calculated by the simple selectivity equation S = ( q 1 / q 2 )/( p 1 / p 2 ), considerably higher than that of NJU-Bai52 (147).…”

Polyoxometalate-Based Ionic Frameworks for Highly Selective CO 2 Capture and Separation

“…where g1 denotes CO 2 , g2 means N 2 , H 2 , or CH 4 37 BIT-72, 38 CPOS-5, 39 and etc., which are reported in the literatures under similar conditions (Table S5) makes it the best for the selectivity of CO 2 over CH 4 to date in porous materials (Table S5). 19,37,[44][45][46][47][48][49][50][51][52][53][54][55][56] Page 26 of 45 CCS Chemistry (Table S8)…”