Controlling the strength of interaction between carbon dioxide and nitrogen-rich carbon materials by molecular design

Abstract

Size selective adsorption of carbon dioxide over nitrogen is maximized in a nitrogen-rich carbon material prepared from a preorganized molecular precursor.

C2N: A Class of Covalent Frameworks with Unique Properties

“…Theoretical calculations indicated that such a high binding enthalpy resulted due to the electron acceptor property of the carbon atoms in C 2 N, which were in close proximity to the oxygen atoms in CO 2 , and collective rebinding/stabilization effects of the nitrogen atoms in the C 2 N layers surrounding the carbon atom of CO 2 . [ 108 ]…”

Understanding Structure–Property Relationships under Experimental Conditions for the Optimization of Lithium‐Ion Capacitor Anodes based on All‐Carbon‐Composite Materials

“…Nitrogen physisorption data of the entire series of prepared composites as well as the condensation products of pure HAT‐CN at different temperatures and the corresponding pore size distributions are shown in Figure S3–S10, Supporting Information, and summarized in Figure S11 and Table S2, Supporting Information. The fact that higher condensation temperature of bulk HAT causes an increase in SSA and pore volume is known from previous studies [ 27,28 ] and also becoming obvious in all composite materials independent of the drying method and loading of HAT‐CN. This in combination with the lower condensation yield at higher temperature (i.e., the higher mass loss of the sample) is responsible for the observed increase in the mass‐specific porosity of the composites with a given loading and drying procedure.…”

Controlling pore size and pore functionality in sp2-conjugated microporous materials by precursor chemistry and salt templating

“…This supports the general observation that materials with high specic surface area usually do not achieve a high selectivity in CO 2 adsorption due to the signicant contribution of the nondiscriminative surface. 29,48 In contrast, the NOC-X-Y samples maintain a relatively high selectivity around 50, regardless of the condensation temperature. As the selectivity is determined by the pore size which has to be small enough to kinetically accept CO 2 molecules (3.30Å; kinetic diameter) but not N 2 molecules (3.64Å) and the content of nitrogen inside, 48 CO 2 can selectively be adsorbed in the samples with the highest ratio of micropore volume over total pore volume such as NOC-550, NOC-550-750, and NOC-550-950.…”

“…NOC-750 and NOC-950 with larger pores have a total CO 2 uptake of 5.3 mmol g À1 and 5.0 mmol g À1 , respectively, which is remarkably high and comparable to or higher than in many of the known nitrogen-doped carbons prepared from more sophisticated precursors. 24,27,29 NOC-550 and NOC-350-550 show a more convex shape of the CO 2 physisorption isotherms at low pressure (<0.1 bar) where the effect of heteroatom doping leading to specic interactions between carbon dioxide molecules and pore walls is more apparent (Fig. 4a and S11 †).…”

“…In consequence, high isosteric heats of adsorption of more than 50 kJ mol À1 are oen observed in carbon dioxide or water adsorption on such heteroatom-doped carbons. 19,[26][27][28][29] Physical adsorption, i.e. van der Waals binding between adsorbents and adsorbates, is proportional to the increase of polarizability of the two partners, i.e.…”