Cu-MOFs催化剂的合成及NH3-SCR脱硝应用研究  

Synthesis of Cu-MOF catalysts and their application in NH_(3)-SCR denitration

作　　者：陈立志 孙毓霞 郭鹏 贺超 谢又妍 CHEN Lizhi;SUN Yuxia;GUO Peng;HE Chao;XIE Youyan(Xi an Branch Company New Energy Sources Co.,Ltd.of China Power Engineering Consulting Group,Xi an 710000,China;Shaanxi Water Group Water Treatment Equipment Co.,Ltd.,Xi an 710000,China)

机构地区：[1]中国电力工程顾问集团新能源有限公司西安分公司,西安710000 [2]陕西省水务集团水处理设备有限公司,西安710000

出　　处：《安全与环境学报》2025年第4期1584-1592,共9页Journal of Safety and Environment

基　　金：西安市科技计划项目(23KGDW0020-2022)。

摘　　要：为减少燃煤过程中产生的NOx排放,开发了具有高性能选择性催化还原法烟气脱硝(Selective Catalytic Reduction,SCR)催化剂。研究采用水热法合成了Cu-MOFs系列催化剂,以筛选可催化去除NOx的催化剂。结果显示:当底物与配体物质的量比为1∶1,反应时间为12 h,温度为120℃时,合成的Cu-MOFs催化剂的得率最高,高达98.71%。在此条件下,催化剂脱硝活性窗口较宽(120~300℃),且随着温度的升高NO去除率从45.11%上升至96.32%。通过系列表征分析脱硝反应机制,发现催化剂表面Cu^(2+)、Cu^(+)共存,且Cu^(2+)参与了NO的去除过程,部分Cu^(2+)转化为了Cu^(+)。To reduce NO_(x)emissions produced during coal combustion,the development of high-performance Selective Catalytic Reduction(SCR)catalysts is of significant practical importance for the removal of pollutants from coal-fired flue gas.In this paper,a series of Cu MOF catalysts were synthesized using the hydrothermal method.Their structural properties were analyzed using SEM EDS,XRD,FT IR,TG,BET,and XPS techniques.The denitration performance of these catalysts was evaluated through NH_(3)SCR tests.The results indicated that when the molarity of the substrate to ligand was set at 1:1,with a reaction time of 12 hours at a temperature of 120℃,the yield of Cu MOFs reached an impressive 98.71%,the highest achieved.Performance characterizations revealed that the catalyst exhibited an excellent structure and high purity.The catalytic performance of Cu MOFs synthesized under optimal conditions was evaluated using NH_(3)SCR.The results demonstrated that the catalyst exhibited a broad range of denitrification activity(120300℃),with the overall NO removal rate increasing as the temperature rose.At a temperature of 270℃,the NO removal rate reached its highest point at 96.32%.Simultaneously,the anti-poisoning performance of the catalyst was examined.It was observed that the introduction of SO_(2)and H_(2)O reduced the NO removal rates to 83.54%and 73.21%,respectively.However,upon the removal of SO_(2)and H_(2)O,the catalyst s NO removal rates were restored to 88.32%and 80.15%.Characterization analysis of the denitration reaction mechanism revealed that the physical and chemical properties of the Cu MOF catalyst remained stable and unchanged before and after the reaction.Both Cu^(2+)and Cu+species coexist on the surface of the catalyst,with Cu^(2+)playing a role in the NO removal process.Additionally,a portion of Cu^(2+)is converted to Cu^(+)during this process.

关 键 词：环境工程学 烟气脱硝 NH3-SCR Cu-MOFs 演变规律 

分 类 号：X511[环境科学与工程—环境工程]