铁铈复合氧化物催化剂SCR脱硝反应动力学研究

熊志波; 郭东旭; 路春美; 张信莉

铁铈复合氧化物催化剂SCR脱硝反应动力学研究

1.
山东大学能源与动力工程学院, 山东济南 250061;
2.
山东大学燃煤污染物减排国家工程实验室, 山东济南 250061

基金项目: 国家自然科学基金面上项目(51276101); 教育部博士点基金(20120131110022); 山东省自然科学基金面上项目(ZR2012EEM013).

详细信息

通讯作者:
路春美(1958-), 女, 山东淄博人, 博士, 教授, 研究方向为热能工程和环境工程.E-mail: cml@sdu.edu.cn.

中图分类号: TK 16
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- 文章访问数: 1730
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- 被引次数: 0
出版历程
- 收稿日期: 2012-11-08
- 修回日期: 2013-01-05
- 刊出日期: 2013-04-30

Kinetic study on the selective catalytic reduction of NO with NH₃ over iron-cerium mixed oxide

1.
School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2.
National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction, Shandong University, Jinan 250061, China

摘要

摘要: 利用共沉淀法制备了铁铈复合氧化物催化剂,在积分实验系统上考察了NO初始浓度、NH₃/NO比及O₂浓度对其SCR脱硝活性的影响;并借助微分系统探讨了其SCR脱硝的催化反应动力学,构建了铁铈复合氧化物催化剂的催化脱硝反应动力学模型.实验结果表明,NO初始浓度越高,每克催化剂的NO转化率越高;随着NH₃/NO比的增加,NO转化率先迅速增加后趋势减缓,最终趋于稳定;O₂在NH₃-SCR反应中起着重要的作用;在175~225 ℃下,Fe_0.95Ce_0.05O_z催化剂的NO和NH₃反应级数分别为1级和0级,O₂的反应级数接近0.5级,该反应的表观活化能为42.6 kJ/mol.
- 铁铈复合氧化物催化剂 /
- 选择性催化还原脱硝 /
- NO /
- 反应动力学
Abstract: Iron-cerium mixed metal oxide (Fe_0.95Ce_0.05O_z) was prepared through co-precipitation method and used as the catalyst in the selective catalytic reduction of NO with NH₃ (NH₃-SCR); the effects of initial concentration of NO, molar ratio of NH₃/NO and O₂ concentration on its NH₃-SCR activity were investigated in an integral reactor at steady-state and the kinetics were considered in a differential reactor. The results indicated that the amount of NO converted over per unit catalyst increases with the initial concentration of NO; with the increase of NH₃/NO mol ratio, NO conversion is firstly increased sharply and then gradually reaches a stable value; O₂ in the flue gas also plays an important role in the NH₃-SCR reaction. The NH₃-SCR reaction over Fe_0.95Ce_0.05O_z exhibits first-order with respect to NO, zero-order to NH₃, and nearly 0.5-order to O₂ at 175~275 ℃; the apparent activation energy is 42.6 kJ/mol.
- iron-cerium mixed oxide catalyst /
- selective catalytic reduction of NO (SCR) /
- NO /
- kinetics

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参考文献(16)

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