摘要
研究了以α-Fe2O3、β-Fe2O3和g-Fe2O3为催化剂的类Fenton试剂溶液氧化吸收NO的过程,分析了3种Fe2O3的晶相结构和表面性质对NO脱除效率的影响机理。脱硝性能测试结果表明:γ-Fe2O3的活性最好,在H2O2浓度为1.5 mol/L、催化剂浓度为20 mmol/L、pH值为5以及反应温度为55℃等条件下,γ-Fe2O3的脱硝率可达87.5%。机理研究表明:3种Fe2O3催化H2O2分解湿法脱除NO的反应发生在催化剂表面,反应过程中存在氧化还原循环,H2O2催化分解的主要产物是·OH。活性差异分析结果表明:Fe2O3的晶相结构和表面性质对NO的脱除效果具有显著的影响,γ-Fe2O3的活性最高是由于比表面积大、分散性高和表面的Fe^2+含量更多,而β-Fe2O3的活性高于α-Fe2O3是由于表面的氧空位含量更多。
The process of oxidative absorption of NO by Fenton-like reagents using α-Fe2O3,β-Fe2O3 and γ-Fe2O3 as catalysts was studied,and the impact mechanisms of crystal structure and surface property of three Fe2O3 on the NO removal efficiency were also analyzed.It is found that the denitration performance of γ-Fe2O3 is the best and the NO removal efficiency could reach 87.5%with the H2O2 concentration of 1.5 mol/L,catalyst concentration of 20 mmol/L,pH value of 5 and reaction temperature of 55℃.The mechanism investigation indicates that the reactions of H2O2 decomposition catalyzed by three Fe2O3 for NO removal occur on the surface of catalysts,the redox cycle exists in the reaction process and the main product of H2O2 decomposition is·OH.Activity difference analysis indicates that the influence of crystal structure and surface property of Fe2O3 on the NO removal is obvious.The highest activity of γ-Fe2O3 can be attributed to its large specific surface area,high dispersion and abundant Fe^2+on the surface and the activity of β-Fe2O3 is higher than α-Fe2O3 due to more oxygen vacancies on the surface.
作者
秦阳
潘卫国
郭瑞堂
郭德宇
张中伟
周柒
QIN Yang;PAN Weiguo;GUO Ruitang;GUO Deyu;ZHANG Zhongwei;ZHOU Qi(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Yangpu District,Shanghai 200090,China;Shanghai Engineering Research Center of Power Generation Environment Protection,Yangpu District,Shanghai 200090,China;Key Laboratory of Environmental Protection Technology for Clean Power Generation in Machinery Industry,Yangpu District,Shanghai 200090,China)
出处
《发电技术》
2020年第5期480-488,共9页
Power Generation Technology
基金
国家自然科学基金项目(21546014)
上海市科委科技攻关项目(18DZ1202502)。
