不同晶型Fe2O3催化H2O2湿法脱硝的实验研究

doi:10.12096/j.2096-4528.pgt.20069

发电技术 ›› 2020, Vol. 41 ›› Issue (5): 480-488.DOI: 10.12096/j.2096-4528.pgt.20069

• 厂界环保岛与数字孪生技术 • 上一篇下一篇

不同晶型Fe₂O₃催化H₂O₂湿法脱硝的实验研究

秦阳¹(),潘卫国^1,^2,^3,*(),郭瑞堂^1,^2,³(),郭德宇¹,张中伟¹,周柒¹

¹ 上海电力大学能源与机械工程学院, 上海市杨浦区 200090
² 上海发电环保工程技术研究中心, 上海市杨浦区 200090
³ 机械工业清洁发电环保技术重点实验室, 上海市杨浦区 200090

收稿日期:2020-08-15 出版日期:2020-10-30 发布日期:2020-11-02
通讯作者: 潘卫国
作者简介:秦阳(1994),男,硕士研究生,主要从事电厂烟气污染物一体化脱除研究, 18832015548@163.com|郭瑞堂(1978),男,博士,教授,主要从事半焦的循环流化床燃烧、选择性催化还原脱硝技术、光催化还原CO₂、光催化制氢、多种污染物协同脱除技术等研究, grta@zju.edu.cn
基金资助:
国家自然科学基金项目(21546014);上海市科委科技攻关项目(18DZ1202502)

Experimental Study on H₂O₂ Wet Denitration Catalyzed by Fe₂O₃ With Different Crystal Forms

Yang QIN¹(),Weiguo PAN^1,^2,^3,*(),Ruitang GUO^1,^2,³(),Deyu GUO¹,Zhongwei ZHANG¹,Qi ZHOU¹

¹ College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Yangpu District, Shanghai 200090, China
² Shanghai Engineering Research Center of Power Generation Environment Protection, Yangpu District, Shanghai 200090, China
³ Key Laboratory of Environmental Protection Technology for Clean Power Generation in Machinery Industry, Yangpu District, Shanghai 200090, China

Received:2020-08-15 Published:2020-10-30 Online:2020-11-02
Contact: Weiguo PAN
Supported by:
National Natural Science Foundation of China(21546014);Science and Technology Research Project of Shanghai Science and Technology Commission(18DZ1202502)

摘要/Abstract

摘要：

研究了以α-Fe₂O₃、β-Fe₂O₃和γ-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Fe²⁺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。

关键词: 湿法脱硝, Fe₂O₃, ·NO, H₂O₂, 氧空位

Abstract:

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 Fe²⁺ on the surface and the activity of β-Fe₂O₃ is higher than α-Fe₂O₃ due to more oxygen vacancies on the surface.

Key words: wet denitration, Fe₂O₃, NO, H₂O₂, oxygen vacancies

中图分类号:

X773
TK16

秦阳,潘卫国,郭瑞堂,郭德宇,张中伟,周柒. 不同晶型Fe₂O₃催化H₂O₂湿法脱硝的实验研究[J]. 发电技术, 2020, 41(5): 480-488.

Yang QIN,Weiguo PAN,Ruitang GUO,Deyu GUO,Zhongwei ZHANG,Qi ZHOU. Experimental Study on H₂O₂ Wet Denitration Catalyzed by Fe₂O₃ With Different Crystal Forms[J]. Power Generation Technology, 2020, 41(5): 480-488.

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不同晶型Fe₂O₃催化H₂O₂湿法脱硝的实验研究

Experimental Study on H₂O₂ Wet Denitration Catalyzed by Fe₂O₃ With Different Crystal Forms

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