SCR脱硝过程中SO<sub>2</sub>催化氧化的原位红外研究

刘亚明; 束航; 徐齐胜; 张玉华; 杨林军

SCR脱硝过程中SO₂催化氧化的原位红外研究

1.
广东电网有限责任公司电力科学研究院, 广东广州 510080;
2.
东南大学能源热转换及其过程测控教育部重点试验室, 江苏南京 210096

基金项目: 广东电网有限责任公司科技项目(K-GD2013-055);国家重点基础研究发展规划(973计划,2013CB228505)。

详细信息

通讯作者:
杨林军,E-mail:ylj@seu.edu.cn。

中图分类号: X511
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- 被引次数: 0
出版历程
- 收稿日期: 2015-03-27
- 修回日期: 2015-05-21
- 刊出日期: 2015-08-30

FT-IR study of the catalytic oxidation of SO₂ during the process of selective catalytic reduction of NO with NH₃ over commercial catalysts

1.
Electric Power Research Institute of Guangdong Power Grid Company, Guangzhou 510080, China;
2.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China

摘要

摘要: 采用工业用V₂O₅-WO₃/TiO₂催化剂,基于傅里叶原位红外光谱(FT-IR)技术考察SO₂的氧化过程及烟气组分对SO₂氧化行为的影响;结果表明,SO₂在催化剂表面氧化主要是首先吸附在催化剂表面V₂O₅活性位上,占据其O原子,以SO^2-₃形式存在,后与催化剂表面V⁵⁺-OH发生反应,生成金属硫酸盐(VOSO₄)中间产物,O₂重新氧化催化氧化过程中由于被SO₂夺取O原子而被还原的V₂O₅物种,使V⁴⁺转化为V⁵⁺,促进金属硫酸盐(VOSO₄)向SO₃转化;SO₂与NO、NH₃的竞争吸附阻碍SO₂在V₂O₅活性点位上的氧化;在SCR中,NO的脱除与SO₂的氧化是相互抑制的关系。
- 原位红外 /
- 选择性催化还原 /
- V₂O₅-WO₃/TiO₂ /
- 脱硝 /
- SO₂催化氧化
Abstract: This work briefly reveals the process of catalytic oxidation of SO₂ and the influences of NH₃, NO and O₂ on the oxidation behavior based on FT-IR.It suggests that the process of oxidation of SO₂: the absorption of SO₂ on V₂O₅ sites occupying its O atom in the form of SO^2-₃; reaction between absorbed SO₂ and O atom in V⁵⁺-OH to form an VOSO₄-like structure;reoxidation of V⁴⁺ to V⁵⁺ by O₂,promoting the transformation from VOSO₄-like intermediate to SO₃ and V₂O₅. NH₃ and NO competitively absorb with SO₂,suppressing its oxidation behavior. The removal of NOx and the oxidation of SO₂ is the relationship of mutual inhibition.
- FT-IR /
- selective catalytic reduction /
- V₂O₅-WO₃/TiO₂ /
- De-NO_x /
- catalytic oxidation of SO₂

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参考文献(29)

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