Nitrogen-doped porous carbons for highly selective CO2 capture from flue gases and natural gas upgrading

Jun Wang, Rajamani Krishna, Jiangfeng Yang, Kodanda Phani Raj Dandamudi, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Nitrogen-doped microporous activated carbon adsorbents were synthesized by a self-template method with KOH as the porogen agent at pyrolysis temperatures of 600, 700, and 800°C. The carbon adsorbent samples were characterized with N2 adsorption at 77K, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermal gravimetric analysis, Raman spectroscopy, Fourier transformed infrared spectroscopy, and energy-dispersive X-ray spectroscopy mapping. Single component gas adsorption equilibrium of CO2, CH4, and N2 on the carbon adsorbents were measured at gas pressures up to 100kPa and temperatures of 273, 298, and 323K. Adsorption breakthrough performance of a fixed bed packed with the carbon adsorbents for separation of CO2/CH4/N2 gas mixture was simulated using the adsorption equilibrium data collected in this work. A high CO2 adsorption capacity (6.36mmolg-1 on N-AC 600 at 100kPa and 273K) and large selectivites for the separation of CO2/CH4 (9.2), CO2/N2 (47.3) and CH4/N2 (3.6) mixtures were achieved with the carbon adsorbents due to their N-containing groups, narrow pore size distribution, and large specific surface area. The nitrogen-doped porous carbon adsorbents look very promising for flue gas treatment and natural gas upgrading applications.

Original languageEnglish (US)
Pages (from-to)156-165
Number of pages10
JournalMaterials Today Communications
Volume4
DOIs
StatePublished - Sep 1 2015
Externally publishedYes

Keywords

  • Activated carbon
  • Breakthrough simulation
  • CO capture
  • Natural-gas upgrading
  • Nitrogen-doped

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Materials Chemistry

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