SONG Tao, LIAO Jing-ming, XIAO Jun, SHEN Lai-hong. Effect of micropore and mesopore structure on CO2 adsorption by activated carbons from biomass. New Carbon Mater., 2015, 30(2): 156-166. doi: 10.1016/S1872-5805(15)60181-0
Citation: SONG Tao, LIAO Jing-ming, XIAO Jun, SHEN Lai-hong. Effect of micropore and mesopore structure on CO2 adsorption by activated carbons from biomass. New Carbon Mater., 2015, 30(2): 156-166. doi: 10.1016/S1872-5805(15)60181-0

Effect of micropore and mesopore structure on CO2 adsorption by activated carbons from biomass

doi: 10.1016/S1872-5805(15)60181-0
Funds:  Special Fund for Major State Basic Research Projects of China (2013CB228106, 2010CB732206); Key Technology Research and Development Program of Jiangsu Province of China (BE2012166).
  • Received Date: 2014-12-30
  • Accepted Date: 2015-05-04
  • Rev Recd Date: 2015-03-18
  • Publish Date: 2015-04-28
  • Activated carbons (ACs) were produced by a one step process with CO2 as the physical activation agent at 800 ℃. The ACs were further activated chemically using KOH, HNO3 or CH3COOH and heat-treated at 300 or 600 ℃ for 1 or 2 h to modify their properties. The effect of CO2 concentration, activation time, types of chemical agents and the post heat-treatment conditions on CO2 capture were investigated. Results showed that the optimum conditions for AC production from corn stalks was at 800 ℃ for 30 min with a CO2 concentration of 20% during the physical activation. Chemical agents and further heat-treatment modified the pore structure of the ACs, resulting in a performance improvement for CO2 adsorption. The BET surface area of one sample (HNO3 activation +100 ℃ water bath 1 h + post heat-treatment at 600 ℃ for 2 h) was 639. 8 m2/g. The maximum CO2 adsorption capacity of the sample was 7.33%, which is higher than that of a commercial AC (6.55%). The CO2 adsorption is dominantly dependent on the mesopore volume when the BET surface area is smaller than 500 m2/g while the adsorption is closely associated with micropore area when the BET surface area is larger than 500 m2/g. The adsorption kinetics agreed well with the Bangham kinetic model.
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