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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.accessioned2015-08-03T10:39:05Zen
dc.date.available2015-08-03T10:39:05Zen
dc.date.issued2012-12-21en
dc.identifier.issn08974756en
dc.identifier.doi10.1021/cm303072nen
dc.identifier.urihttp://hdl.handle.net/10754/562462en
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.en
dc.description.sponsorshipThis research was supported by baseline funding and an AEA research grant from KAUST to Yu Han.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectCO2 adsorptionen
dc.subjectextra-framework cationsen
dc.subjectflue gas treatmenten
dc.subjectmicroporous carbonen
dc.titleSuperior capture of CO2 achieved by introducing extra-framework cations into N-doped microporous carbonen
dc.typeArticleen
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 Materialsen
dc.contributor.institutionSchool of Energy, Soochow University, Suzhou, Jiangsu 215006, China*
dc.contributor.institutionSchool of Chemistry, Dalian University of Technology, Dalian, 116024, China*
kaust.authorZhao, Yunfeng*
kaust.authorLiu, Xin*
kaust.authorYao, Kexin*
kaust.authorHan, Yu*
kaust.authorZhao, Lan*


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