SO<sub>2</sub>对甲烷在金属铁表面还原NO的反应影响

苏亚欣; 苏阿龙; 任立铭; 邓文义

SO₂对甲烷在金属铁表面还原NO的反应影响

东华大学环境科学与工程学院, 上海 201620

基金项目: 国家自然科学基金（51278095）；上海市自然科学基金（11ZR1401000）。

详细信息

通讯作者:
苏亚欣（1972-），男，博士，教授，E-mail：suyx@dhu.edu.cn，Tel：021-67792552

中图分类号: X511
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出版历程
- 收稿日期: 2013-08-06
- 修回日期: 2013-10-23
- 刊出日期: 2014-03-31

Effect of SO₂ on the reduction of NO by methane over iron catalyst

School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

摘要

摘要: 采用卧式程序控温电加热陶瓷管反应器，在N₂和模拟烟气气氛中、300~1 100 ℃下，研究了SO₂对甲烷在金属铁及其氧化物表面还原NO反应的影响。采用XRD等手段对反应前后铁催化剂样品的组成变化进行了表征，分析了SO₂在甲烷-铁脱硝反应中的作用机理。结果表明，甲烷在金属铁及氧化铁表面能够高效率地还原NO，NO还原效率不受烟气中SO₂的影响。在SO₂体积分数为0.01%~0.04%的N₂气氛中，温度高于700 ℃时，金属铁上NO还原率和SO₂脱除率可同时达到100%。在SO₂体积分数为0.01%~0.04%的模拟烟气中，当温度高于850 ℃时，NO还原效率达到90%以上；温度为950 ℃时，NO还原效率达到98%，SO₂对NO还原效率的影响可忽略。当反应温度为1 000 ℃时，在含0.02%SO₂的模拟烟气中，甲烷的体积分数为1.13%时，持续100 h金属铁表面上的NO还原效率都能保持95%以上。
- NO还原 /
- 甲烷 /
- 铁 /
- 氧化铁 /
- SO₂
Abstract: The effect of SO₂ on the reduction of NO by methane over iron and iron oxides was investigated at 300~1 100 ℃ in an electrically heated ceramic tubular flow reactor in simulated flue gas and N₂ atmosphere. The iron catalyst after reaction was characterized by X-ray diffraction (XRD) and the mechanism of NO reduction by methane over iron catalyst in the presence of SO₂ was elucidated. The results demonstrated that methane is effective to reduce NO over iron and iron oxides and SO₂ in the flue gas has little influence on the reduction of NO. In N₂ atmosphere with 0.01%~0.04% SO₂, metallic iron can simultaneously eliminate almost 100% of NO and SO₂ at a temperature above 700 ℃. In the simulated flue gas with 0.01%~0.04% SO₂, the efficiencies of NO reduction at 850 ℃ and 950 ℃ are higher than 95% and 98%, respectively; the influence of SO₂ on NO reduction is insignificant. More than 95% of NO is reduced by 1.13% methane over iron at 1 000 ℃ in a durable test over 100 h in the simulated flue gas atmosphere containing 0.02% SO₂.
- NO reduction /
- methane /
- iron /
- iron oxide /
- SO₂

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参考文献(27)

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