标题：Preparation of porous carbons with high low-pressure CO2uptake by KOH activation of rice husk char
作者：Li, Dawei ;Ma, Tengfei ;Zhang, Ruliang ;Tian, Yuanyu ;Qiao, Yingyun
作者机构：[Li, Dawei ;Ma, Tengfei ;Tian, Yuanyu ] College of Chemical Engineering, China University of Petroleum (East China), Qingdao, China;[Ma, Tengfei ] Pet 更多
摘要：Porous carbons for CO2capture at low pressures were prepared by KOH activation of rice husk char. Low activation temperature (640-710 °C) and small KOH/char ratio (1:1) favored the increase in low-pressure CO2uptake. The CO2uptakes at 0.1 bar (0°C) reached 2.11 mmol/g, which were probably the highest value ever reported for porous carbons prepared from lignocellulosic biomass. The high CO2uptakes at low pressures were ascribable to the presence of micropores (<0.7 nm or <1 nm), the narrow micropore size distribution, or the existence of nitrogen. The obtained porous carbons also exhibited a large CO2uptake at 1 bar (6.24 mmol/g at 0°C) and good CO2-over-N2selectivity. No noticeable change in CO2uptake was observed after five successive runs of adsorption-desorption. The excellent recyclability, high CO2uptakes, and good selectivity show that high-performance porous carbons for capturing CO2at low pressures can be prepared by KOH activation of rice husk char.
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