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Adsorption

, Volume 24, Issue 2, pp 169–177 | Cite as

Resorcinol–formaldehyde carbon xerogel as selective adsorbent of carbon dioxide present on biogas

  • Jose F. Vivo-Vilches
  • Agustín F. Pérez-Cadenas
  • Francisco J. Maldonado-Hódar
  • Francisco Carrasco-Marín
  • Maria J. Regufe
  • Ana M. Ribeiro
  • Alexandre F. P. Ferreira
  • Alirio E. Rodrigues
Article

Abstract

A carbon xerogel obtained by carbonization of a resorcinol–formaldehyde polymer which was synthesized using Cs2CO3 as catalyst was employed as CO2 selective adsorbent for biogas upgrading. The material presented a large narrow micropore volume (W0(CO2) = 0.34 cm3 g−1) and macropore volume; as expected for a carbon xerogel, these macropores are very regular in size. The CO2 preferential adsorption onto this material was tested by analysing adsorption equilibrium isotherms of both gases (CO2 and CH4) and breakthrough curves at different inlet concentrations. Equilibrium studies showed a large CO2 uptake (qsat = 6.57 mol kg−1 and ΔHads = − 28.4 kJ mol−1) compared to the CH4 one (qsat = 3.83 mol kg−1 and ΔHads = − 19.6 kJ mol−1) revealing a high CO2 to CH4 selectivity, especially at low pressures. Dynamic adsorption of both gases at different concentrations demonstrated the excellent performance of the prepared xerogel in biogas upgrading by selective adsorption of CO2. The adsorbent was tested in binary dynamic adsorption to estimate its performance when both gases are present; the carbon xerogel was able to completely separate them.

Keywords

Carbon xerogel Biogas upgrading Carbon dioxide Selective adsorption 

Notes

Acknowledgements

This research is supported by the FEDER and Spanish projects CTQ2013-44789-R (MINECO) and P12-RNM-2892 (Junta de Andalucía). The author Vivo-Vilches is grateful to Spanish MECD for his FPU grant. This work was financially supported by: Project POCI-01-0145-FEDER-006984—Associate Laboratory LSRE-LCM funded by FEDER through COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI)—and by national funds through FCT—Fundação para a Ciência e a Tecnologia.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Jose F. Vivo-Vilches
    • 1
  • Agustín F. Pérez-Cadenas
    • 1
  • Francisco J. Maldonado-Hódar
    • 1
  • Francisco Carrasco-Marín
    • 1
  • Maria J. Regufe
    • 2
  • Ana M. Ribeiro
    • 2
  • Alexandre F. P. Ferreira
    • 2
  • Alirio E. Rodrigues
    • 2
  1. 1.Carbon Materials Research Group, Department of Inorganic ChemistryUniversity of GranadaGranadaSpain
  2. 2.Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LA LSRE-LCM), Department of Chemical Engineering, Faculty of EngineeringUniversity of PortoPortoPortugal

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