燃料化学学报（中英文）2025，Vol.53Issue(9)：1330-1341,中插1-中插14,26.DOI:10.1016/S1872-5813(25)60568-8
微量KOH催化CO2活化与KOH活化制备具有优异碳捕集性能生物炭的研究
Research on biochar prepared by trace KOH catalyzed CO2 activation vs KOH activation as advanced candidate for carbon capture
摘要
Abstract
The technology for green and macro-conversion of solid waste biomass to prepare high-quality activated carbon demands urgent development.This study proposes a technique for synthesizing carbon adsorbents using trace KOH-catalyzed CO2 activation.Comprehensive investigations were conducted on three aspects:physicochemical structure evolution of biochar,mechanistic understanding of trace KOH-facilitated CO2 activation processes,and application characteristics for CO2 adsorption.Results demonstrate that biochar activated by trace KOH(＜10％)and CO2 achieves comparable specific surface area(1244.09 m2/g)to that obtained with 100％KOH activation(1425.10 m2/g).The pore structure characteristics(specific surface area and pore volume)are governed by CO and CH4 generated through K-salt catalyzed reactions between CO2 and biochar.The optimal CO2 adsorption capacities of KBC adsorbent reached 4.70 mmol/g(0 ℃)and 7.25 mmol/g(25 ℃),representing the maximum values among comparable carbon adsorbents.The 5％KBC-CO2 sample exhibited CO2 adsorption capacities of 3.19 and 5.01 mmol/g under respective conditions,attaining current average performance levels.Notably,CO2/N2 selectivity(85∶15,volume ratio)reached 64.71 at 0.02 bar with robust cycling stability.Molecular dynamics simulations revealed that oxygen-containing functional groups accelerate CO2 adsorption kinetics and enhance micropore storage capacity.This technical route offers simplicity,environmental compatibility,and scalability,providing critical references for large-scale preparation of high-quality carbon materials.关键词
生物炭/微量KOH/催化活化/CO2活化/碳捕获Key words
biochar/trace KOH/catalyzed activation/CO2 activation/carbon capture分类
能源科技引用本文复制引用
邓立华,夏伟,杨智焜,张文达,冯冬冬,孙绍增,赵义军..微量KOH催化CO2活化与KOH活化制备具有优异碳捕集性能生物炭的研究[J].燃料化学学报（中英文）,2025,53(9):1330-1341,中插1-中插14,26.基金项目
The project was supported by the National Natural Science Foundation of China(52376103,542B2081). （52376103,542B2081）
