Carbon Letters

, Volume 29, Issue 6, pp 553–566 | Cite as

A role of the microtextural and surface chemical heterogeneities of porous carbons for the adsorption of CO2, CO and N2

  • Moon Hyeon KimEmail author
  • Sang Ok Choi
  • Soo Tae Choo
Original Article


Microtextural and surface chemical heterogeneities of activated carbons (AC) have been studied to see their distinctive role for the adsorption of CO2, CO and N2 at 25 °C and up to 850 Torr. Not only the microtextural properties influence the adsorption of the gases, particularly CO2, but the chemical surface heterogeneity also plays a significant role for CO2 adsorption. The volume of ultramicropores < 7 Å is of predominantly importance in high CO2 adsorption at pressures above 30 Torr. However, the average size of micropores and their size distribution, and the chemical surface heterogeneity are much more critical at the Henry’s law region (< 30 Torr). The latter could be well characterized by the amount and Henry constant of CO2 adsorption at the low pressures, the Toth model parameters, the change in CO2/CO and CO2/N2 selectivities with respect to pressure, the amount of CO from the thermal decomposition, and the direct probing of very strong basicity sites using a technique that is the temperature-programmed desorption of CO2 adsorbed. All of them are consistent with the difference in the energetic nonuniformity between ACs studied, except for the last measure whose results could be reasonably explained when combining with the microtextural heterogeneity.


CO2 adsorption Microporous carbons Microtextural heterogeneity Chemical surface heterogeneity Surface basicity 


Compliance with ethical standards

Conflict of interest

There is no potential conflict of interest to this article.


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Copyright information

© Korean Carbon Society 2019

Authors and Affiliations

  1. 1.Department of Environmental EngineeringDaegu UniversityJillyang, GyeongsanRepublic of Korea
  2. 2.Experiment and Research TeamLotte-BP Chemicals Co. Ltd.Ulju, UlsanRepublic of Korea
  3. 3.Optimization TeamLotte-BP Chemicals Co. Ltd.Ulju, UlsanRepublic of Korea

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