Importance of Micropore–Mesopore Interfaces in Carbon Dioxide Capture by Carbon‐Based Materials

Abstract

Mesoporous carbonaceous materials (Starbons ) derived from low-value/waste bio-resources separate CO 2 from CO 2 /N 2 mixtures.C ompared to Norit activated charcoal (AC), Starbons have much lower microporosities (8-32 % versus 73 %) yet adsorb up to 65 %more CO 2 .The presence of interconnected micropores and mesopores is responsible for the enhanced CO 2 adsorption. The Starbons also showed three-four times higher selectivity for CO 2 adsorption rather than N 2 adsorption compared to AC.Supportinginformation for this article can be found under: http://dx.

Pyridine-Functionalized and Metallized Meso-Macroporous Polymers for Highly Selective Capture and Catalytic Conversion of CO2 into Cyclic Carbonates

“…Many recent works have disclosed the importance of mesopores and/or macropores in the selective adsorption of CO 2 from N 2 . 18,41,42 More importantly, abundant mesopores and/or macropores provide enhanced pathways for the fast diffusion of reactants during CO 2 conversion. 18,41,42 Therefore, the metal@PDVB-VP-x composites prepared in this work are expected to have high performance for the selective capture and conversion of CO 2 from dilute sources.…”

“…18,41,42 More importantly, abundant mesopores and/or macropores provide enhanced pathways for the fast diffusion of reactants during CO 2 conversion. 18,41,42 Therefore, the metal@PDVB-VP-x composites prepared in this work are expected to have high performance for the selective capture and conversion of CO 2 from dilute sources. Up to now, there are still few research works on the usage of nitrogen-functionalized and metallized meso-macroporous polymers for selective capture and conversion of CO 2 .…”

Insights into CO2/N2 Selectivity in Porous Carbons from Deep Learning

“…23 An empirical relation for CO 2 adsorption capacity as a function of mesopore (V meso ) and micropore (V micro ) volumes has been proposed for porous carbons: M ads CO 2 = 0.095 + 2.10 × V micro + 3.51 × V micro × V meso . 24 Although this relationship can be used to predict CO 2 uptake, it will have difficulty in predicting CO 2 /N 2 selectivity, since it does not apply to other gases such as N 2 . In addition, it is often very difficult to measure accurately the low N 2 uptakes in materials with high CO 2 /N 2 selectivity, so it is desirable to predict N 2 uptakes to guide synthesis.…”

Optimal Size of a Cylindrical Pore for Post-Combustion CO2 Capture

“…With the decrease of the diameter, the overlap effect becomes increasingly strong, and the maximum bonding energy becomes larger. For CNT [11,0], the double-well shape of the PES changes to a flat-bottom, single-well form, where the maximum binding energy is −0.56 eV and the width of this potential energy bottom is about 1.4 Å. Apparently, this is the size where the two minima in the PES curve begin to merge into one.…”

“…Figure 7 shows the snapshots of CO 2 distribution inside CNTs of different sizes at 0.15 bar. When the diameter is small in the cases of [9,0] and [10,0], the CO 2 molecules concentrate at the center of CNTs along the central axis, but when the diameter is larger as in [11,0], some CO 2 molecules move away from the central axis toward the wall. While the CO 2 molecules are more or less oriented along the central axis in CNT [9,0], some CO 2 molecules are actually oriented almost perpendicularly to the central axis in CNT [10,0].…”