title: Imine-linked polymer-derived nitrogen-doped microporous carbons with excellent CO2 capture properties.
abstract: A series of nitrogen-doped microporous carbons (NCs) was successfully prepared by direct pyrolysis of high-surface-area microporous imine-linked polymer (ILP, 744 m(2)/g) which was formed using commercial starting materials based on the Schiff base condensation under catalyst-free conditions. These NCs have moderate specific surface areas of up to 366 m(2)/g, pore volumes of 0.43 cm(3)/g, narrow micropore size distributions, and a high density of nitrogen functional groups (5.58-8.74%). The resulting NCs are highly suitable for CO2 capture adsorbents because of their microporous textural properties and large amount of Lewis basic sites. At 1 bar, NC-800 prepared by the pyrolysis of ILP at 800 °C showed the highest CO2 uptakes of 1.95 and 2.65 mmol/g at 25 and 0 °C, respectively. The calculated adsorption capacity for CO2 per m(2) (μmol of CO2/m(2)) of NC-800 is 7.41 μmol of CO2/m(2) at 1 bar and 25 °C, the highest ever reported for porous carbon adsorbents. The isosteric heats of CO2 adsorption (Qst) for these NCs are as high as 49 kJ/mol at low CO2 surface coverage, and still ~25 kJ/mol even at high CO2 uptake (2.0 mmol/g), respectively. Furthermore, these NCs also exhibit high stability, excellent adsorption selectivity for CO2 over N2, and easy regeneration and reuse without any evident loss of CO2 adsorption capacity.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, 1295 Dingxi Road, Shanghai 200050, China. jiacheng.wang@mail.sic.ac.cn
authors.forename: Jiacheng
authors.initials: J
authors.lastname: Wang
authors.forename: Irena
authors.initials: I
authors.lastname: Senkovska
authors.forename: Martin
authors.initials: M
authors.lastname: Oschatz
authors.forename: Martin R
authors.initials: MR
authors.lastname: Lohe
authors.forename: Lars
authors.initials: L
authors.lastname: Borchardt
authors.forename: Andreas
authors.initials: A
authors.lastname: Heerwig
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.forename: Stefan
authors.initials: S
authors.lastname: Kaskel