CO2捕集用具有多级孔结构纳米孔炭的制备

摘要

Nanoporous carbons with a hierarchical pore structure were prepared by a combination of hard-templating of a thermosetting phenolic resin containing silica nanoparticles,pyrolysis and KOH activation.The influence of the amount of KOH on the pore structure of the templated and activated carbons was investigated by N2 adsorption and the effect of pore structure on the CO2adsorption capacity was investigated by thermogravimetric analysis.Results indicated that KOH activation promoted the formation of micropores and small mesopores for the templated carbon.The utilization ratio of mesopores for the capture of CO2 is high compared with that of micropores.The porous carbon prepared under a mass ratio of KOH to templated carbon of 2 ∶ 1 has both developed mesopores and micropores,and has a largest adsorption capacity for CO2 among all samples investigated.%以模板法结合化学活化法制备了具有分级结构的纳米孔炭.分别利用氮气吸附法和热重分析法考查KOH活化程度对模板法制备中孔炭的孔结构的影响和不同孔结构的多孔炭对CO2的吸附性能.结果表明,KOH活化不仅增加了大量的微孔,而且使得模板脱除得到的中孔数量降低.中孔吸附CO2对孔表面的利用率最高,而中孔和微孔的合适配比更有利用综合提高CO2的吸附量.制备的纳米孔炭具有较高的CO2吸附量和较好的循环性能和稳定性.