Journal
JOURNAL OF POROUS MATERIALS
Volume 22, Issue 6, Pages 1581-1588Publisher
SPRINGER
DOI: 10.1007/s10934-015-0041-7
Keywords
CO2 capture; Peanut shell; Adsorption; Biomass; Porous carbon
Funding
- National Natural Science Foundation of China [51206099, 41202194]
- Fundamental Research Funds for the Central Universities [15CX02024A]
- Zhejiang Key Level 1 Discipline of Forestry Engineering [2014lygcz019]
- Key Laboratory of Chemical Utilization of Forestry Biomass of Zhejiang Province [2014lCUFB04]
- Program for New Century Excellent Talent in University of the Ministry of Education of China [NCET-11-1031]
- National High Technology Research and Development Program of China [2012AA051801-2]
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Highly microporous carbons with large CO2 uptakes at atmospheric pressure were prepared by KOH activation of peanut shell char at different temperatures (680-780 A degrees C). The porous carbons (PCs) showed a microporosity of 99.0-99.5 %, with micropore volume and specific surface area varying from 0.73 to 0.79 ml/g and 1713 to 1893 m(2)/g, respectively. The adsorption of CO2 onto the PCs was a physisorption process. The CO2 uptakes of the PCs increased with decreasing the activation temperature. The 680 A degrees C-activated sample showed a 1-bar CO2 uptake of 7.25 mmol/g (0 A degrees C), which was among the highest values ever reported for biomass-based PCs. The high uptake was principally ascribable to its developed small micropores (< 1 nm). Besides, this PC displayed a large 1-bar CO2 uptake at 25 A degrees C (4.41 mmol/g), fast CO2 adsorption rate, moderate CO2-over-N-2 selectivity, and excellent recyclability. These adsorption properties showed that the peanut-shell-based PC was a promising adsorbent for CO2 capture or storage.
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