Superior capture of CO2 achieved by introducing extra-framework cations into N-doped microporous carbon

Handle URI:
http://hdl.handle.net/10754/562462
Title:
Superior capture of CO2 achieved by introducing extra-framework cations into N-doped microporous carbon
Authors:
Zhao, Yunfeng; Liu, Xin; Yao, Kexin; Zhao, L. J.; Han, Yu ( 0000-0003-1462-1118 )
Abstract:
We 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.
KAUST Department:
Advanced Membranes and Porous Materials Research Center; Biological and Environmental Sciences and Engineering (BESE) Division; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Nanostructured Functional Materials (NFM) laboratory
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
Issue Date:
21-Dec-2012
DOI:
10.1021/cm303072n
Type:
Article
ISSN:
08974756
Sponsors:
This research was supported by baseline funding and an AEA research grant from KAUST to Yu Han.
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZhao, Yunfengen
dc.contributor.authorLiu, Xinen
dc.contributor.authorYao, Kexinen
dc.contributor.authorZhao, L. J.en
dc.contributor.authorHan, Yuen
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 Centeren
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentNanostructured Functional Materials (NFM) laboratoryen
dc.identifier.journalChemistry of Materialsen
dc.contributor.institutionSchool of Energy, Soochow University, Suzhou, Jiangsu 215006, Chinaen
dc.contributor.institutionSchool of Chemistry, Dalian University of Technology, Dalian, 116024, Chinaen
kaust.authorZhao, Yunfengen
kaust.authorLiu, Xinen
kaust.authorYao, Kexinen
kaust.authorHan, Yuen
kaust.authorZhao, L. J.en
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