Journal
CHEMICAL ENGINEERING JOURNAL
Volume 253, Issue -, Pages 46-54Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.04.115
Keywords
Biomass; Adsorption temperature; Activated carbon; CO2 adsorption; Narrow micropore
Categories
Funding
- Tsinghua University-Veolia Environnement Joint Research Center for Advanced Technology
- Collaborative Innovation Center for Regional Environmental Quality
- National Nature Science Foundation of China [21177070]
- Laboratory Fund of Tsinghua University
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Pine nut shell-derived activated carbons were prepared at different KOH/C mass ratios and activation temperatures, and they were used to adsorb CO2 at different adsorption temperatures and pressures. The optimal activated carbon had the CO2 adsorption of up to 7.7 mmol/g at 273 K and 5.0 mmol/g at 298 K at 1 bar, the highest capacities at ambient pressure among all the biomass-derived carbons. The micropore distribution of activated carbons was highly dependent on the KOH/C ratio and activation temperature in the preparation. The activated carbons with larger micropores suffered the greater loss of CO2 adsorbed amounts at high adsorption temperatures. The accurate ranges of micropores responsible for CO2 adsorption at different temperatures were fully studied. When the adsorption temperature increased from 273 to 348 K, the ranges of effective micropore for CO2 adsorption at 1 bar narrowed from 0.33-0.82 nm to 0.33-0.52 nm. Under typical flue gas conditions at 348 K and CO2 partial pressure of 0.15 bar, the effective micropore range decreased to 0.33-0.40 nm, and the CO2 adsorbed amount was about 0.7 mmol/g on p-2-973-1.5. The accurate micropore ranges obtained are helpful in the preparation and selection of efficient activated carbons for CO2 adsorption under different conditions. (C) 2014 Elsevier B.V. All rights reserved.
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