煅烧温度对Mn改性γ-Fe<sub>2</sub>O<sub>3</sub>催化剂结构及低温SCR脱硝活性的影响

张信莉; 王栋; 彭建升; 路春美; 徐丽婷

煅烧温度对Mn改性γ-Fe₂O₃催化剂结构及低温SCR脱硝活性的影响

张信莉¹,
王栋^1,2,
彭建升¹,
路春美^1,2,,
徐丽婷^1,2

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(51276101); 山东省自然科学基金(ZR2012EEM013); 高等学校博士学科点专项科研基金(20120131110022)。

详细信息

通讯作者:
路春美, Tel: 0531-88392264, E-mail: cml@sdu.edu.cn。

中图分类号: X701
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出版历程
- 收稿日期: 2014-09-19
- 修回日期: 2014-11-25
- 刊出日期: 2015-02-28

Influence of calcination temperature on structural property of Mn doped γ-Fe₂O₃ catalysts and low-temperature SCR activity

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: 采用共沉淀法,在不同煅烧温度下制备一系列Mn改性γ-Fe₂O₃催化剂(Fe_0.7Mn_0.3O_z),研究了煅烧温度对Fe_0.7Mn_0.3O_z催化剂低温SCR脱硝活性的影响,并借助XRD、N₂吸附-脱附、EDS及SEM等手段对催化剂进行表征。结果表明,350 ℃煅烧所得Fe_0.7Mn_0.3O_z催化剂的低温SCR活性最佳,在70 ℃时取得92%的NO_x转化率,100~200 ℃可维持100%的NO_x转化率,而450 ℃煅烧所得催化剂的低温SCR活性最低;煅烧温度为350 ℃时,催化剂具有最大的比表面积和比孔容、发达的孔隙结构及适当结晶度的γ-Fe₂O₃,而煅烧温度为400或450 ℃时,催化剂发生烧结且有α-Fe₂O₃生成,不利于低温SCR反应的进行,因此,Fe_0.7Mn_0.3O_z催化剂的最佳煅烧温度为350 ℃。
- 低温选择性催化还原 /
- 催化剂 /
- 煅烧温度 /
- γ-Fe₂O₃ /
- Mn
Abstract: A series of Mn doped γ-Fe₂O₃ catalysts(Fe_0.7Mn_0.3O_z) were prepared with different calcining temperatures via a coprecipitation method, and the influences of calcination temperature on the low-temperature selective catalytic reduction (SCR) activity of Fe_0.7Mn_0.3O_z catalysts were investigated. The catalysts were characterized by N₂ adsorption-desorption, X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS). The results indicate that Fe_0.7Mn_0.3O_z catalysts calcined at 350 ℃ exhibit the best low-temperature SCR activity, and the NO_x conversion reaches above 90% at 70 ℃ and 100% at 100~200 ℃, while the catalysts calcined at 450 ℃ show a poor low-temperature SCR activity. When the calcination temperature is 350 ℃, the catalysts possess the highest specific surface area and pore volume, flourishing pore structure and appropriate γ-Fe₂O₃ crystallinity. However, when the calcination temperature is increased to 400 or 450 ℃, the sintering takes place and α-Fe₂O₃ appears in Fe_0.7Mn_0.3O_z catalysts, which is unfavorable to the low-temperature SCR reaction. Therefore, 350 ℃ is recommended as the optimum calcination temperature for Fe_0.7Mn_0.3O_z catalysts.
- low-temperature selective catalytic reduction /
- catalyst /
- calcination temperature /
- γ-Fe₂O₃ /
- Mn

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