氮-碱耦合改性生物炭的制备及CO_(2)吸附性能  

Preparation and CO_(2)adsorption performance of nitrogen-alkali coupling modified biochar

作　　者：慕佳琪 方震华 刘晓华[1] 冯秀娟[2] MU Jiaqi;FANG Zhenhua;LIU Xiaohua;FENG Xiujuan(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;State Key Laboratory of Fine Chemicals,Frontier Science Center for Smart Materials,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学能源与动力学院海洋能源与节能教育部重点实验室,辽宁大连116024 [2]大连理工大学化工学院智能材料化工前沿科学中心精细化工国家重点实验室,辽宁大连116024

出　　处：《精细化工》2025年第4期771-779,共9页Fine Chemicals

摘　　要：采用尿素对酸枣木屑进行改性得到了氮改性酸枣木基生物炭,然后通过KOH活化得到了氮-碱耦合改性生物炭。通过正交实验考察了活化温度、活化时间和浸渍KOH质量分数对耦合改性生物炭综合吸附性能的影响。在模拟电厂烟气环境下(CO_(2)体积分数15%、吸附压力0.1 MPa、吸附温度25℃、进气流速2.1 m/min)筛选出综合吸附性能最优的氮-碱耦合改性生物炭,对其进行了SEM、XRD、FTIR和BET表征,探究了其在不同吸附工况条件下(烟气温度、进气流速、CO_(2)体积分数)的CO_(2)动态吸附特性的变化规律。结果表明,在活化温度1073 K、活化时间1.5 h、浸渍KOH质量分数30%条件下制备的氮-碱耦合改性生物炭(SAC-1073-1.5-K30)综合吸附性能最优,其CO_(2)动态吸附容量(4.17 mmol/g)、再生特性(96.6%)和耐水性(95.4%)均表现良好;SAC-1073-1.5-K30的CO_(2)动态吸附容量与吸附温度、进气流速呈负相关,与CO_(2)体积分数呈正相关。SAC-1073-1.5-K30在吸附温度25℃、进气流速8.40 m/min、CO_(2)体积分数15%的最佳吸附工况下的CO_(2)动态吸附容量为3.59 mmol/g,穿透时间33.8 s。Nitrogen-alkali coupling modified biochar was obtained from KOH activation on nitrogen-modified jujube wood-based biochar,which was prepared via urea modification of jujube wood chips.The influence of activation temperature,activation time,and impregnation KOH mass fraction on the comprehensive adsorption property of coupled modified biochar were analyzed via orthogonal experiments.The nitrogen-alkali coupled modified biochar with the best comprehensive adsorption performance was selected under a simulated power plant flue gas environment(CO_(2)volume fraction 15%,adsorption pressure 0.1 MPa,adsorption temperature 25℃,inlet flow rate 2.1 m/min),and characterized by SEM,XRD,FTIR and BET.Its CO_(2)dynamic adsorption characteristic was studied under varying operating conditions(flue gas temperature,inlet flow rate,and CO_(2)volume fraction).The results indicated that the nitrogen-alkali coupling modified biochar(SAC-1073-1.5-K30)prepared under the conditions of activation temperature 1073 K,activation time 1.5 h and impregnated KOH mass fraction 30%exhibited the best comprehensive adsorption property with the highest CO_(2)dynamic adsorption capacity(4.17 mmol/g),good regeneration characteristic(96.6%)and water resistance(95.4%).Furthermore,the CO_(2)dynamic adsorption capacity of SAC-1073-1.5-K30 was negatively correlated with adsorption temperature and inlet flow rate,and positively correlated with CO_(2)volume fraction.Under the optimal adsorption conditions of adsorption temperature 25℃,inlet flow rate of 8.40 m/min,and CO_(2)volume fraction of 15%,the CO_(2)dynamic adsorption capacity was 3.59 mmol/g,and the penetration time was 33.8 s.

关 键 词：耦合改性 生物炭 动态吸附 再生特性 耐水性 功能材料 

分 类 号：TQ424[化学工程] TK09[动力工程及工程热物理]