Unprecedented performance of N-doped activated hydrothermal carbon towards C2H6/CH4, CO2/CH4, and CO2/H2 separation

Bin Yuan, Jun Wang, Yingxi Chen, Xiaofei Wu, Hongmei Luo, Shuguang Deng

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A series of N-doped porous carbons with different textural properties and N contents was prepared from a mixture of algae and glucose and their capability for the separation of CO2/CH4, C2H6/CH4, and CO2/H2 binary mixtures under different conditions (bulk pressure, mixture composition, and temperature) were subsequently assessed in great detail. It was observed that the gas (C2H6, CO2, CH4, and H2) adsorption capacity at different pressure regions was primarily governed by different adsorbent parameters (N level, narrow micropore volume, and BET specific surface area). More interestingly, it was found that N-doping can selectively enhance the heats of adsorption of C2H6 and CO2, while it had a negligible effect on those of CH4 and H2. The adsorption equilibrium selectivities for separating C2H6/CH4, CO2/CH4, and CO2/H2 gas mixture pairs on the porous carbons were predicted using the ideal adsorbed solution theory (IAST) based on pure-component adsorption isotherms. In particular, sample NAHA-1 exhibited by far the best performance (in terms of gas adsorption capacity and selectivity) reported for porous carbons for the separation of these three binary mixtures. More significantly, NAHA-1 carbon outperforms many of its counterparts (e.g. MOFs and zeolites), emphasizing the important role of carbonaceous adsorbents in gas purification and separation.

Original languageEnglish (US)
Pages (from-to)2263-2276
Number of pages14
JournalJournal of Materials Chemistry A
Volume4
Issue number6
DOIs
StatePublished - 2016

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Carbon
Binary mixtures
Adsorption
Carbonaceous adsorbents
Gas fuel purification
Zeolites
Gas adsorption
Algae
Adsorption isotherms
Gas mixtures
Specific surface area
Adsorbents
Glucose
Gases
Doping (additives)
Chemical analysis
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Unprecedented performance of N-doped activated hydrothermal carbon towards C2H6/CH4, CO2/CH4, and CO2/H2 separation. / Yuan, Bin; Wang, Jun; Chen, Yingxi; Wu, Xiaofei; Luo, Hongmei; Deng, Shuguang.

In: Journal of Materials Chemistry A, Vol. 4, No. 6, 2016, p. 2263-2276.

Research output: Contribution to journalArticle

Yuan, Bin ; Wang, Jun ; Chen, Yingxi ; Wu, Xiaofei ; Luo, Hongmei ; Deng, Shuguang. / Unprecedented performance of N-doped activated hydrothermal carbon towards C2H6/CH4, CO2/CH4, and CO2/H2 separation. In: Journal of Materials Chemistry A. 2016 ; Vol. 4, No. 6. pp. 2263-2276.
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