Adsorption of CO2, CH4 and N2 on N-doped highly porous activated carbons: Approach for selective adsorption of flue gas and natural gas upgrading

Jun Wang, Rajamani Krishna, Jiangfeng Yang, Shugaung Deng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Three N-doped microporous activated carbon adsorbents were synthesized with KOH as the porogen agent at pyrolysis temperatures of 600, 700, and 800°C. The adsorbent samples were characterized by X-ray diffraction, scanning electron microscopy, thermal gravimetric analysis, Raman spectra, Fourier transformed infrared (FT-IR) spectra, Energy-dispersive X-ray Spectroscopy (EDS) mapping, and volumetric nitrogen adsorption. CO2, CH4, and N2 adsorption isotherms were measured at 100 kPa and three different temperatures after activation. All isotherms were correlated with the Langmuir model. The heat of adsorption was calculated using the Clausius-Clapeyron equation based on single component adsorption isotherms. These data were used to estimate the separation selectivities for CO2/CH4, CO2/N2, and CH4/N2 binary mixtures at 298K and 100 kPa with the ideal adsorbed solution theory (IAST) model. Extremely good selectivites were achieved due to their N-containing groups, narrow pore size distribution, and large specific surface area. In addition, breakthrough simulations for CO2/CH4/N2 binary mixtures were conducted. The result is superior to ZIF-7 under the same condition. Based on these advantages, we infer N-ACs could be suitable and promising adsorbents for flue gas selective adsorption and natural gas upgrading.

Original languageEnglish (US)
Title of host publicationInternational Congress on Energy 2014, ICE 2014 - Topical Conference at the 2014 AIChE Annual Meeting
PublisherAIChE
Pages1889-1893
Number of pages5
ISBN (Electronic)9781510812444
StatePublished - 2014
Externally publishedYes
EventInternational Congress on Energy 2014, ICE 2014 - Topical Conference at the 2014 AIChE Annual Meeting - Atlanta, United States
Duration: Nov 16 2014Nov 21 2014

Publication series

NameInternational Congress on Energy 2014, ICE 2014 - Topical Conference at the 2014 AIChE Annual Meeting
Volume3

Other

OtherInternational Congress on Energy 2014, ICE 2014 - Topical Conference at the 2014 AIChE Annual Meeting
CountryUnited States
CityAtlanta
Period11/16/1411/21/14

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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