烟气组分对甲基脲-氯化乙酰胆碱低共熔溶剂吸收NO的影响机制  

INFLUENCE OF FLUE GAS COMPONENTS ON NO ABSORPTION BY METHYLUREA-BASED DEEP EUTECTIC SOLVENT

作　　者：代芮嘉 肖鑫鑫 赵永奇[1] 魏傲然 陈星星[1] 余江龙[1] 窦金孝[1] DAI Ruijia;XIAO Xinxin;ZHAO Yongqi;WEI Aoran;CHEN Xingxing;YU Jianglong;DOU Jinxiao(Key Laboratory for Advanced Coal and Coking Technology of Liaoning Province,School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学化学工程学院辽宁先进煤焦化省重点实验室,辽宁鞍山114051

出　　处：《环境工程》2024年第5期62-69,共8页Environmental Engineering

基　　金：辽宁省自然科学基金项目(2022-MS-354);国家自然科学基金项目(22378180);辽宁科技大学研究生科技创新项目(LKDYC202214)。

摘　　要：低共熔溶剂(deep eutectic solvents,DESs)作为一种新型的“绿色溶剂”,具有无毒无害、不易蒸发、热稳定性良好等特点,被用于吸收烟气中的有毒气体(NO)。采用甲基脲(MTU)和氯化乙酰胆碱(AchCl)制备低共熔溶剂(MTU-AchCl DESs)进行NO吸收性能研究,重点探究了DESs配比、NO浓度、O_(2)、H_(2)O和CO_(2)对其吸收效果的影响。结果表明:MTU-AchCl DESs在摩尔比为2∶1时的脱硝性能最佳。当烟气中存在O_(2)时,MTU-AchCl DESs对NO由最大吸收量为0.223 g/g,O_(2)通过转化NO为NO_(2)促进其吸收。当烟气中通入CO_(2)时,MTU-AchCl DESs对NO的吸收效果有一定促进。当通入H_(2)O时,DESs的吸收量下降,H_(2)O对DESs体系吸收NO有抑制效果。通过FI-IR和Gaussian模拟计算结果发现,MTU-AchCl DESs与NO以氮氧双键(NO)、氮氧单键(N—O)以及氮氮单键(N—N)的形式结合。加入O_(2)、CO_(2)和H_(2)O后,DESs体系的反应焓从-53.334 kJ/mol分别变化到-56.212,-55.423,-50.982 kJ/mol,模拟结果进一步验证了烟气组分对NO的吸收效果有不同影响。Deep eutectic solvents(DESs),as a new kind of green solvent,are non-toxic and harmless,hard to evaporate,and have good thermal stability.Using deep eutectic solvents to soak up toxic gases in flue(especially NO)becomes one of the key lookup contents.In this study,methyl urea(MTU)and acetylcholine chloride(AchCl)were used to prepare a deep eutectic solvent(MTU-AchCl DES)to learn about its NO absorption performance,and impact of DESs'mixing ratio,NO concentration,O_(2),H_(2)O and carbon dioxide on the absorption performance.The experimental consequences showed that the overall denitrification performance of MTU-AchCl DESs was best when the molar ratio was 1∶2.When there was O_(2) in the flue gas,the highest absorption capacity of NO by MTU-AchCl DESs was 0.223 g/g.O_(2) promoted the absorption with the aid of oxidizing NO into NO_(2).When CO_(2) was delivered into the flue gas,the absorption of MTU-AchCl DESs on NO had promotion in a certain degree.When H_(2)O was once introduced,the absorption of DESs decreased,and H_(2)O had an inhibitory impact on the absorption of NO in the DESs system.Through FI-IR and Gaussian simulation results,it was discovered that MTU-AchCl DESs and NO were mixed in the structure of nitrogen-oxygen double bond(NO),nitrogen-oxygen single bond(N—O)and nitrogen-nitrogen single bond(N—N).After the addition of O_(2),CO_(2) and H_(2)O,the response enthalpy of the DESs machine changed from-53.334 kJ/mol to-56.212 kJ/mol,-55.423 kJ/mol and-50.982 kJ/mol.The simulation result was further verified that the components of flue gas had different effects on the absorption of NO.

关 键 词：低共熔溶剂 烟气组分 脱硝 甲基脲 吸收 

分 类 号：X701[环境科学与工程—环境工程]