Microporous Polyimides with Uniform Pores for Adsorption and Separation of CO₂Gas and Organic Vapors

Abstract

Three microporous polyimides, MPI-1, MPI-2, and MPI-3, with uniform pores were synthesized via one-pot polycondensation from tetrakis(4-aminophenyl)methane, tris(4-aminophenyl)amine and 1,3,5tris(4-aminophenyl)benzene with pyromellitic dianhydride, respectively. The amorphous networks exhibit excellent thermal stability, large BET surface areas up to 1454 m 2 g −1 , and narrow pore size distribution in the range from 5 to 6 Å. Their adsorption−desorption isotherms of CO 2 are reversible, and the CO 2 uptakes at 273 K and 1 bar are up to 16.8 wt %. Moreover, based on the ratios of initial slopes of isotherms, the CO 2 /N 2 and CO 2 /CH 4 separation factors are as high as 102 and 12, respectively. The above CO 2 adsorption and separation properties are attributed to the presence of abundant electron-rich heteroatoms in the polyimide networks and the unifrom ultralmicroporous structures. In addition, for MPI-1, the adsorption capacity of benzene vapor is 119.8 wt %, while the separation factors of benzene over nitrogen and water reach 342 and 28, respectively. The outstanding selective adsorptions of CO 2 gas and benzene vapor endow the microporous polyimides with promising potential in CO 2 capture and separation as well as air-and water-cleaning applications.

Synthesis of covalent triazine-based frameworks with high CO2 adsorption and selectivity

“…The high CO2/N2 selectivity of PCTFs can be attributed to the stronger interaction with CO2 molecule than N2. Although these values are lower than those of porous polymers with highly polar functional groups 35 such as HMP Py-1 (117), 23 and MPIs (41−102), 63 they are higher or comparable to conjugated microporous networks P-1 (18), 64 covalent triazine-based frameworks (14-41), 29 polyimides SMPI-0 (30), 65 and dibenzoheterocycle-functional nanoporous polymeric networks NPTNs . 66 Attributing to their high 40 selectivity of CO2-over-N2 and CO2-over-CH4, the PCTFs synthesized in this work could have potential for postcombustion CO2 capture.…”

Porous imine-based networks with protonated imine linkages for carbon dioxide separation from mixtures with nitrogen and methane

“…The selectivities of the polymers for CO 2 over CH 4 were calculated at a typical feed composition for either natural gas with 5% CO 2 and 95% CH 4 or landll gas with 50% CO 2 and 50% CH 4 ( 25 and MPI-1 (102). 75 For PIN1_2 no calculation of the CO 2 /N 2 selectivity was possible because of the very low N 2 loading. The predicted CO 2 / CH 4 selectivities of the PINs for 05 : 95 mixtures in a natural gas application are found to be in the range of 8-12 (273 K) and 7-8 (298 K.) Meanwhile in a specied utilization of landll gas (CO 2 / CH 4 50 : 50) the values for the polymers are 4-5 (273 K) and 5-6 (298 K).…”

A perylene diimide (PDI)-based small molecule with tetrahedral configuration as a non-fullerene acceptor for organic solar cells

“…[67][68][69] By employing this building block as a core and attaching PDIs on it, 70,71 a novel acceptor with 3D configuration could be constructed. [67][68][69] By employing this building block as a core and attaching PDIs on it, 70,71 a novel acceptor with 3D configuration could be constructed.…”