铜基CO-SCR脱硝催化剂试验研究  

Explorational experiment on the copper-based CO-SCR denitrification catalyst

作　　者：赵霞 仇志超 陆强 庄柯[1] 董长青[2] ZHAO Xia;QIU Zhi-chao;LU Qiang;ZHUANG Ke;DONG Chang-qing(State Power Environmental Protection Research Institute,Nanjing 210031,China;National Engineering Laboratory for Biomass Power Generation Equipment,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国电环境保护研究院,南京210031 [2]华北电力大学生物质发电成套设备国家工程实验室,北京102206

出　　处：《安全与环境学报》2018年第4期1490-1495,共6页Journal of Safety and Environment

基　　金：国家973计划项目(2015CB251501);北京市科技专项(Z171100001117064);国家环境保护大气物理模拟与污染控制重点实验室开放基金课题

摘　　要：为提高铜基催化剂的CO-SCR脱硝性能,并降低反应温度,以铜为活性组分,铁为助剂,γ-Al2O3为催化剂载体,采用等体积浸渍法制备了一系列Cu-Fe/γ-Al2O3型CO-SCR脱硝催化剂,考察了活性组分负载量、助剂成分及负载量、催化剂预处理及烟气工况对催化剂活性的影响,并对催化剂进行了XRD、BET、XPS和AES等表征。结果表明,预处理会使催化剂表面的部分Cu2＋转变为Cu＋,有利于反应的进行。铜负载量为5%时催化剂的脱硝效率最高,铁的加入可以明显提高铜基催化剂在较低温度下的脱硝效率,5Cu-3Fe/γ-Al2O3催化剂表现出最优的脱硝性能,在450℃下脱硝效率达到99.8%。The present paper is aimed at improving the CO-SCR activity of the copper based catalysts and decreasing the reaction temperature. For the said purpose,we have prepared a series of CO-SCR catalysts of Cu-Fe/γ-Al2O3 type with the incipient wetness impregnation method by taking copper as the active component,iron to be the promoter,and γ-Al2O3 as the carrier. It is necessary to conduct the experiments to trace and determine the effects of the active component and the contents of the promoter by testing the pretreating effects as well as flue gas conditions on the activities of the catalysts. What is more,the experiment can help to characterize the catalysts by means of the following ways,such as the X-ray diffraction（ XRD）,physical absorption,the X-ray photoelectron spectroscopy（ XPS） and the atomic emission spectrometry（ AES）. The results of our experiments indicate that part of Cu2＋ tends to be reduced into Cu＋by the pretreatment with carbon monoxide so as to give a push to the CO-SCR reaction. Besides,the catalyst with 5% Cu tends to be endowed with the highest NO removal activity,thus being able to promote the activity of NO promptly at lower temperatures by adding Fe. The reason for the action can be predicted that it is beneficial to dope of Fe to the dispersion of Cu on the carrier surface,which can reinforce the interaction between the active components and the carrier. Moreover,the electronic transfer in the compound of Cu2＋＋ Fe2＋→Cu＋＋ Fe3＋ is likely to benefit the SCR reaction. In so doing,through a series of screening experiments on the active component and promoter contents,the catalyst 5 Cu-3 Fe/γ-Al2O3 would soon reveal the best denitrification performance so as for the denitrification efficiency could to be strengthened by a rate of 99. 8% at the temperature of 450 ℃. And,then,the NO concentration in the flue gas processed by CO-SCR with 5 Cu-3Fe/γ-Al2O3 at 450 ℃ may get lower than 7 mg/m3. Finally,denitrification activities of the optimal catalyst were tested un

关 键 词：环境工程学 CO-SCR 脱硝 负载型催化剂 氧化铜 氧化铁 

分 类 号：X383[环境科学与工程—环境工程]