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Carbon molecular sieves from soybean straw-based activated carbon for CO2/CH4 separation

  • Xu, Yuxian (College of Environmental Science and Engineering, Fujian Normal University) ;
  • Chen, Xiaochuan (College of Environmental Science and Engineering, Fujian Normal University) ;
  • Wu, Dan (College of Environmental Science and Engineering, Fujian Normal University) ;
  • Luo, Yongjin (College of Environmental Science and Engineering, Fujian Normal University) ;
  • Liu, Xinping (College of Environmental Science and Engineering, Fujian Normal University) ;
  • Qian, Qingrong (College of Environmental Science and Engineering, Fujian Normal University) ;
  • Xiao, Liren (Fujian Key Laboratory of Pollution Control & Resource Reuse) ;
  • Chen, Qinghua (College of Environmental Science and Engineering, Fujian Normal University)
  • Received : 2017.06.02
  • Accepted : 2017.08.25
  • Published : 2018.01.31

Abstract

Soybean straw (SS)-based activated carbon was employed as a precursor to prepare carbon molecular sieves (CMSs) via chemical vapor deposition (CVD) technique using methane as carbon source. Prior to the CVD process, SS was activated by 0.5 wt% $ZnCl_2$, followed by a carbonization at $500^{\circ}C$ for 1 h in $N_2$ atmosphere. $N_2$ (77 K) adsorption-desorption and $CO_2$ (273 K) adsorption tests were carried out to analyze the pore structure of the prepared CMSs. The results show that increasing the deposition temperature, time or methane flow rate leads the decrease in $N_2$ adsorption capacity, micropore volume and average pore diameter of CMSs. The adsorption selectivity coefficient of $CO_2/CH_4$ achieves as high as 20.8 over CMSs obtained under the methane flow rate of $30mL\;min^{-1}$ at $800^{\circ}C$ for 70 min. The study demonstrates the prepared CMSs are a candidate adsorbent for $CO_2/CH_4$ separation.

Keywords

References

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