化工进展 ›› 2020, Vol. 39 ›› Issue (3): 1012-1020.doi: 10.16085/j.issn.1000-6613.2019-0630

• 工业催化 • 上一篇    下一篇

基于α-FeOOH催化H2O2蒸气的低温烟气脱硝实验

何珊珊(),熊源泉(),杨思源,盖洋洋   

  1. 东南大学能源热转换及其过程测控教育部重点实验室,江苏 南京 210096
  • 收稿日期:2019-04-21 出版日期:2020-03-05 发布日期:2019-12-05
  • 通讯作者: 熊源泉 E-mail:heshanshan1995a@163.com;101004591@seu.edu.cn
  • 作者简介:何珊珊(1995—),女,硕士研究生,研究方向为烟气脱硫脱硝。E-mail:heshanshan1995a@163.com
  • 基金资助:
    国家自然科学基金(51376047)

Low-temperature flue gas denitration by H2O2 vapor over α-FeOOH

Shanshan HE(),Yuanquan XIONG(),Siyuan YANG,Yangyang GAI   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2019-04-21 Online:2020-03-05 Published:2019-12-05
  • Contact: Yuanquan XIONG E-mail:heshanshan1995a@163.com;101004591@seu.edu.cn

摘要:

针铁矿是分布广泛、储量丰富的铁氧化物,其主要成分为α-羟基氧化铁(α-FeOOH)。为了探究针铁矿在催化H2O2烟气脱硝反应中的性能,本文通过沉淀-水解法制备了α-FeOOH,并在自行搭建的实验台上开展了α-FeOOH催化H2O2的低温烟气脱硝实验研究,深入分析了H2O2流量、H2O2浓度、汽化温度、反应温度和共存气体浓度等工况参数对脱硝性能的影响。采用离子色谱(IC)分析了单独脱硝反应和同时脱硫脱硝反应后的含氧酸成分,结合各项表征分析技术考察了催化剂反应前后的理化特性和稳定性。实验结果显示,随着汽化温度和反应温度的升高,NO的脱除效率先增加后降低;增加H2O2浓度对脱硝效率有明显的促进作用。当汽化温度为140℃、反应温度为160℃时,以2.5mL/h注入10mol/L的H2O2脱硝效率达到80%。当SO2浓度为1000μL/L时,脱硝效率提高至86.4%。离子色谱分析结果显示,单独脱硝反应和同时脱硫脱硝反应后含氧酸产物为HNO3和H2SO4。反应前后催化剂的表征结果显示,α-FeOOH在脱硝反应后依然具有良好的稳定性,显示出针铁矿在低温烟气脱硝工艺中的潜在应用前景。

关键词: 催化剂, 汽化, 自由基, 低温烟气脱硝, 脱硝效率

Abstract:

Goethite is an abundantly and widely distributed iron oxide with α-FeOOH as the main component. To investigate the performance of goethite in catalytic denitration of flue gas by H2O2, α-FeOOH catalyst was prepared by precipitation-hydrolysis method and then used in the bench scale denitration experiments. The effects of H2O2 flow rate, H2O2 concentration, vaporization temperature, reaction temperature and coexisting gas concentration on the denitrification performance were analyzed. Ion chromatography (IC) was used to analyze the oxyacid components after denitrification and those after simultaneous desulfurization and denitrification. Various characterization techniques were also used to examine the physicochemical properties and stability of the catalyst before and after the reaction. The results showed that with the increase of vaporization temperature and reaction temperature, the removal efficiency of NO increased firstly and then decreased, and the increase of H2O2 concentration had significantly enhanced the denitration efficiency. When the vaporization and reaction temperatures were 140℃ and 160℃ respectively, the denitration efficiency reached 80% by injecting 10mol/L H2O2 at a flow rate of 2.5mL/h. When the SO2 concentration was 1000μL/L, the denitration efficiency increased to 86.4%. The ion chromatography analysis showed that the oxyacid products were HNO3 and H2SO4 after denitration and desulfurization. The characterization results of the catalysts showed that the α-FeOOH still had excellent stability after denitration reaction, which illustrated the potential application prospect of the goethite in low temperature flue gas denitration process.

Key words: catalyst, vapor, radical, low temperature flue gas denitration, denitration efficiency

中图分类号: 

  • X511