CoV氧化物催化剂制备及其逃逸氨脱除性能研究  

Research on NH_(3)-SCO performance of CoV oxide catalyst prepared by regulation

作　　者：杜亚丽 苗改琴 马荣 武鲜凤 安霞[2] 吴旭[2] DU Yali;MIAO Gaiqin;MA Rong;WU Xianfeng;AN Xia;WU Xu(College of Chemistry and Chemical Engineering,Jinzhong University,Jinzhong 030619,China;College of Chemistry,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]晋中学院化学化工学院,山西晋中030619 [2]太原理工大学化学学院,太原030024

出　　处：《功能材料》2023年第12期12076-12084,共9页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(52000092);山西省基础研究计划项目(202103021224043)。

摘　　要：随着工业烟气NH_(3)-SCR技术的快速发展,研发匹配温窗的逃逸氨选择性氧化(NH_(3)-SCO)催化剂意义重大。基于钴、钒氧化物的优异特性,本文尝试借助不同方法(机械组装法、浸渍法、类水滑石模板法)协调组装Co、V制备优势钴钒氧化物(CoV-MEC、CoV-IMP、CoV-LDO),系统研究所制备CoV氧化物催化剂理化性质及NH_(3)-SCO性能。结果显示,相比机械组装和浸渍法,类水滑石前驱体衍生制得的CoV氧化物拥有更大的比表面积,更丰富的表面酸量和更适宜的氧化还原能力,150~360℃范围内更好地平衡了NH_(3)氧化活性和N_(2)选择性。当T=360℃时,NH_(3)去除效率近100%,氮气选择性70%,优异的性能和其表面吸附的NH_(3)可被O_(2)快速氧化生成NO,且反应遵循i-SCR机制有关。研究为构筑CoV基逃逸氨高效脱除催化剂提供了重要参考。With the rapid development of selective catalytic reduction by ammonia gas(NH_(3)-SCR)technology in industrial flue gas,it is of great significance to develop a catalyst for selective oxidation of escaping ammonia(NH_(3)-SCO)with matching temperature window.Based on the catalytic properties of Co and V metal oxides in the NH_(3)-SCO reaction,this paper attempts to prepare CoV composite oxide catalysts(CoV-MEC,CoV-IMP,CoV-LDO)by using different methods(mechanical assembly,impregnation,hydrotalcite-like template method)to assemble Co and V,and the effect of the synthesis way on the physical and chemical properties and the removal performance of escaping ammonia of the catalysts was systematically evaluated.The results show that CoV oxide catalysts derived from the hydrotalcite-like precursor had larger specific area,richer surface acid content and more suitable redox capacity,showing better N_(2) selectivity compared with mechanical assembly and impregnation methods.It can better balance NH_(3) oxidation performance and N_(2) selectivity in the range of 150-360℃.NH_(3) removal efficiency was nearly 100% and N_(2) selectivity was kept at 70% at 360℃.Its excellent performance is related to the fact that NH_(3) adsorbed on its surface can be rapidly oxidized to NO by O_(2),and the reaction follows the i-SCR mechanism.This work can provide important reference for constructing CoV-based mixed oxides catalysts with excellent performance in applications for NH_(3)-SCO.

关 键 词：CoV复合氧化物 类水滑石 逃逸氨 NH_(3)-SCO N_(2)选择性 

分 类 号：N34[自然科学总论] X5[环境科学与工程—环境工程]