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dc.contributor.authorZhao, Yunfeng
dc.contributor.authorLiu, Xin
dc.contributor.authorYao, Kexin
dc.contributor.authorZhao, Lan
dc.contributor.authorHan, Yu
dc.date.accessioned2015-08-03T10:39:05Z
dc.date.available2015-08-03T10:39:05Z
dc.date.issued2012-12-21
dc.identifier.issn08974756
dc.identifier.doi10.1021/cm303072n
dc.identifier.urihttp://hdl.handle.net/10754/562462
dc.description.abstractWe designed and prepared a novel microporous carbon material (KNC-A-K) for selective CO2 capture. The combination of a high N-doping concentration (>10 wt %) and extra-framework cations, which were introduced into carbonaceous sorbents for the first time, endowed KNC-A-K with exceptional CO2 adsorption capabilities, especially at low pressures. Specifically, KNC-A-K exhibited CO2 uptake of 1.62 mmol g -1 at 25 C and 0.1 bar, far exceeding the CO2 adsorption capability of most reported carbon material to date. Single component adsorption isotherms indicated that its CO2/N2 selectivity was 48, which also significantly surpasses the selectivity of conventional carbon materials. Furthermore, breakthrough experiments were conducted to evaluate the CO2 separation capability of KNC-A-K on CO2/N2 (10:90 v/v) mixtures under kinetic flow conditions, and the obtained CO 2/N2 selectivity was as high as 44, comparable to that predicted from equilibrium adsorption data. Upon facile regeneration, KNC-A-K showed constant CO2 adsorption capacity and selectivity during multiple mixed-gas separation cycles. Its outstanding low-pressure CO 2 adsorption ability makes KNC-A-K a promising candidate for selective CO2 capture from flue gas. Theoretical calculations indicated that K+ ions play a key role in promoting CO2 adsorption via electrostatic interactions. In addition, we found that HCl molecules anchored in N-doped carbon have a similar promotion effect on CO 2 adsorption, which contradicts the conventional wisdom that the neutralization of basic sites by acids diminishes the adsorption of acidic CO2 gas. © 2012 American Chemical Society.
dc.description.sponsorshipThis research was supported by baseline funding and an AEA research grant from KAUST to Yu Han.
dc.publisherAmerican Chemical Society (ACS)
dc.subjectCO2 adsorption
dc.subjectextra-framework cations
dc.subjectflue gas treatment
dc.subjectmicroporous carbon
dc.titleSuperior capture of CO2 achieved by introducing extra-framework cations into N-doped microporous carbon
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentChemical Science Program
dc.contributor.departmentImaging and Characterization Core Lab
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Lab
dc.contributor.departmentNanostructured Functional Materials (NFM) laboratory
dc.identifier.journalChemistry of Materials
dc.contributor.institutionSchool of Energy, Soochow University, Suzhou, Jiangsu 215006, China
dc.contributor.institutionSchool of Chemistry, Dalian University of Technology, Dalian, 116024, China
kaust.personZhao, Yunfeng
kaust.personLiu, Xin
kaust.personYao, Kexin
kaust.personHan, Yu
kaust.personZhao, Lan


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