烧结烟气条件下微波催化直接分解NO脱硝试验  

Research on direct decomposition of NO by microwave catalysis under condition of sintering flue gas

作　　者：易钰涵 康建刚[2] 余春沐 杨本涛 魏进超[2] 周继承[1] 徐文涛[1] YI Yuhan;KANG Jiangang;YU Chunmu;YANG Bentao;WEI Jinchao;ZHOU Jicheng;XU Wentao(School of Chemical Engineering and Technology,Xiangtan University,Xiangtan 411105,Hunan,China;Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,Hunan,China)

机构地区：[1]湘潭大学化工学院,湖南湘潭411105 [2]中冶长天国际工程有限责任公司,湖南长沙410205

出　　处：《烧结球团》2024年第2期99-106,共8页Sintering and Pelletizing

基　　金：中冶长天科研开发基础研究基金资助项目(2020JCYJ02);国家自然科学基金面上项目(22178295)。

摘　　要：复杂烧结烟气条件下,实现低温高效直接分解NO具有极大挑战性。在低温过量O_(2)且含SO_(2)和CO_(2)气氛下,本文通过研制CeO_(2)/MgCo_(2)O_(4)-40% BaCO_(3)催化剂用于微波催化高效直接分解NO,并考察该催化剂的脱硝和抗硫性能;通过XRD和TEM表征分析催化剂失活以及改性后失活得到改善的原因。结果表明:当进入气体中CO_(2)体积分数为5%时,该微波催化剂的脱硝率几乎保持稳定;引入CeO_(2)后,该微波催化剂的抗硫性能明显提升,在SO 2体积分数为0.1%气氛下,当反应温度仅为250℃时,该微波催化剂可实现99.9%的NO转化率和99.9%的N 2选择性;TEM结果表明,反应前后,该催化剂的形貌特征无明显差异。本文建立的微波催化直接分解NO的脱硝新方法,可为复杂烧结烟气条件下绿色深度脱硝提供新途径。It is a great challenge to realize direct decomposition of NO at low temperature and high efficiency under complex sintering flue gas conditions.A CeO_(2)/MgCo_(2)O_(4)-40% BaCO_(3) catalyst is developed for the efficient direct decomposition of NO in microwave catalysis under the condition of low temperature with excess O_(2) and some SO_(2) and CO_(2),and then the denitration performance and sulfur resistance of the catalyst are investigated.XRD and TEM characterization are used to analyze the catalyst deactivation and the reasons for the improvement of the deactivation after modification.The results show that the denitrification rate of the microwave catalyst is almost stable when the volume fraction of CO_(2) in the inlet gas is 5%.After CeO_(2) is introduced,the sulfur resistance of the microwave catalyst is obviously improved.Under the atmosphere of 0.1% SO_(2) volume fraction and the reaction temperature is only 250℃,the microwave catalyst could achieve 99.9% NO conversion and 99.9% N_(2) selectivity.TEM results show that there is no obvious difference in the topography features of the catalyst before and after the reaction.The new denitration method of direct decomposition of NO by microwave catalysis established in this paper can provide a new way for green deep denitration under complex sintering flue gas condition.

关 键 词：NO直接分解 微波催化 CeO_(2)/MgCo_(2)O_(4)-40%BaCO_(3) 脱硝性能 抗硫性能 抗二氧化碳性能 

分 类 号：TF046.4[冶金工程—冶金物理化学] X701.7[环境科学与工程—环境工程] O643.361[理学—物理化学]