Adsorption

, Volume 24, Issue 4, pp 357–369 | Cite as

Microstructure effect of carbon materials on the low-concentration methane adsorption separation from its mixture with nitrogen

  • Donglei Qu
  • Ying Yang
  • Kai Lu
  • Lin Yang
  • Ping Li
  • Jianguo Yu
  • Ana Mafalda Ribeiro
  • Alirio E. Rodrigues
Article
  • 85 Downloads

Abstract

Due to the weak polarities of CH4 and N2 and their similar physicochemical properties, the microporous adsorbents have a little amount of adsorption capacity for the low-concentration methane, and the separation of CH4/N2 is also very difficult to accomplish by the adsorption-based process. Microstructure of carbon materials plays a decisive role for CH4/N2 effective separation and CH4 enrichment from the low-concentration methane gas mixed with nitrogen. This work focuses on the research of carbon material microstructure, including the selection of raw material or precursor for the carbon skeleton formation, effect of the specific surface area of carbon material on the low-concentration methane adsorption amount, the relationship between micropore size distribution of carbon material and CH4/N2 adsorption separation mechanism, and effect of different activator on the weak polar methane adsorption capacity. According to the microstructure analysis, the granular activated carbons (GACs) are prepared in lab-scale with the optimal preparation conditions, raw coconut shell carbonization for 2 h at 1073 K under N2 atmosphere and KOH activation for 1 h at 1073 K under N2 atmosphere with the KOH to carbonized material ratio of 3:1. And then, the home-made GACs (about 200 g) were packed in a column. A four-step one-bed vacuum pressure swing adsorption (VPSA) process was adopted to evaluate the low-concentration methane adsorption separation performance from its mixture with nitrogen.

Keywords

Methane enrichment CH4/N2 separation Carbon microstructure VPSA process Unconventional natural gas 

Notes

Acknowledgements

The authors wish to acknowledge National Nature Science Foundation of China (Grant U1610102, 21506063), the International S&T Cooperation Program of China (Grant 2016YFE0132500, 2015DFG42220), POCI-01-0145-FEDER-006984—Associate Laboratory LSRE-LCM funded by ERDF through COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI)—and by national funds through FCT—Fundação para a Ciência e a Tecnologia.

Supplementary material

10450_2018_9951_MOESM1_ESM.docx (19 kb)
Supplementary material 1 (DOCX 19 KB)

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Copyright information

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

Authors and Affiliations

  • Donglei Qu
    • 1
  • Ying Yang
    • 1
  • Kai Lu
    • 1
  • Lin Yang
    • 1
  • Ping Li
    • 1
  • Jianguo Yu
    • 1
  • Ana Mafalda Ribeiro
    • 2
  • Alirio E. Rodrigues
    • 2
  1. 1.State Key Laboratory of Chemical Engineering, School of Chemical EngineeringEast China University of Science and TechnologyShanghaiChina
  2. 2.Laboratory of Separation and Reaction Engineering (LSRE), Associated Laboratory LSRE/LCM, Department of Chemical Engineering, Faculty of EngineeringUniversity of PortoPortoPortugal

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