摘要
氮氧化物(NO_(x))是当前重要的大气污染物之一,其主要治理技术有选择性催化还原(SCR)、吸附法等,其中前者应用最为广泛。随着中低温SCR脱硝技术在钢铁、水泥、垃圾焚烧等行业的应用,NO_(x)排放得到有效控制。催化剂是SCR技术的核心,以FeTiO_(x)/TiO_(2)催化材料为主要研究对象,考察该催化剂及负载V_(2)O_(5)和MoO_(3)后的V-Mo/FeTiO_(x)/TiO_(2)催化剂的SCR性能,通过多项表征技术研究催化剂结构与性能的关系,为脱硝催化剂性能优化提供参考。结果表明:V-Mo/FeTiO_(x)/TiO_(2)催化剂因其较好的氧化还原性能、较多的弱酸性位点,在200-400℃范围内具有较高的催化活性;催化剂吸附NH_(3)前后的IR结果表明,负载钒钼后的催化剂L酸位点和B酸位点强度均高于负载前的催化剂,吸附NO_(2)前后的IR结果表明FeTiO_(x)/TiO_(2)催化剂表面的活性位点被大量硝酸盐物种覆盖。
Nitrogen oxides(NO_(x))are currently one of the major air pollutants,which are released from industrial emissions and automobile exhaust.Main techniques to remove NO_(x)include Selective Catalytic Reduction(SCR)and absorption methods.The former is more widely used,and with successful applications of low-to-medium-temperature SCR denitrification technology in steel,cement and waste incineration industry,NO_(x)emissions have been under effective control.In SCR technology,catalysts play a vital role.Therefore,in this work,we studied on SCR performance of catalytic material FeTiO_(x)/TiO_(2)itself as well as V-Mo-based catalyst supported on FeTiO_(x)/TiO_(2).The correlation between their catalytic properties and catalyst structure will be explored via advanced characterization techniques,aiming to provide insights for the promotion of the present catalyst.
作者
刘淑珍
边春艺
于浩
訾学红
宋丽云
LIU Shu-zhen;BIAN Chun-yi;YU Hao;ZXue-hong;SONG Li-yun(College of Materials Science and Enginccring,Beijing 100124,China;College of Environmental Science and Engincering,Beijing University of Technology,Beijing 100124,China)
出处
《化学研究与应用》
CAS
北大核心
2024年第4期868-875,共8页
Chemical Research and Application
基金
国家自然科学基金青年项目(21806005)资助。
