Premium
A Method for Creating Microporous Carbon Materials with Excellent CO 2 ‐Adsorption Capacity and Selectivity
Author(s) -
Qian Dan,
Lei Cheng,
Wang EnMin,
Li WenCui,
Lu AnHui
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300585
Subject(s) - adsorption , microporous material , carbonization , carbon fibers , selectivity , chemical engineering , raw material , materials science , activated carbon , chemistry , organic chemistry , composite material , catalysis , composite number , engineering
A new synthetic approach for the fabrication of microporous carbon materials (HCMs) by using discrete chelating zinc species as dynamic molecular porogens to create extra micropores that enhance their CO 2 ‐adsorption capacity and selectivity is reported. During the carbonization process, the evaporation of the in situ‐formed Zn species would create additional nanochannels that contribute to the additional micropore volume for CO 2 adsorption. The resultant HCMs show an increased number of micropores, with sizes in the range 0.7–1.0 nm and a high CO 2 ‐adsorption capacity of 5.4 mmol g −1 (23.8 wt %) at 273 K and 3.8 mmol g −1 (16.7 wt %) at 298 K and 1 bar, which are superior to those of most carbon‐based adsorbents with N‐doping or high specific surface areas. Dynamic gas‐separation measurements, by using 16 % CO 2 in N 2 ( v / v ) as a feedstock, demonstrated that CO 2 could be effectively separated from N 2 under ambient conditions and shows a high separation factor ( S CO 2 /N 2=110) for CO 2 over N 2 , thereby reflecting a strongly competitive CO 2 ‐adsorption capacity. If the feedstock contained water vapor, the dynamic capacity of CO 2 was almost identical to that measured under dry conditions, thus indicating that the carbon material had excellent tolerance to humidity. Easy CO 2 release could be realized by purging an argon flow through the fixed‐bed adsorber at 298 K, thus indicating good regeneration ability.