| MnOx/Al-SBA-15的结构性质及低温NH3选择性催化还原NOx |
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| 引用本文： | 黄萍,盘思伟,黄碧纯,程华,叶代启,吴军良,付名利,卢圣良.MnOx/Al-SBA-15的结构性质及低温NH3选择性催化还原NOx[J].物理化学学报,2013,29(1):176-182. |
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| 作者姓名： | 黄萍 盘思伟 黄碧纯 程华 叶代启 吴军良 付名利 卢圣良 |
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| 作者单位： | 1.College of Environmental Science & Engineering, South China University of Technology, Guangzhou 510006, P. R. China;2.Electric Power Research Institute of Guangdong Power Grid Corporation, P. R. China;3.Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, P. R. China;4.Guangzhou Environment Protection Investment Co. Ltd., Guangzhou 510700, P. R. China |
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| 基金项目： | 广州市重大科技专项计划(X2DLB2080501)资助项目~~ |
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| 摘 要： | 采用后合成法制备MnOx/Al-SBA-15催化剂, 考察了催化剂的低温NH3选择性催化还原(SCR)NOx的性能. 利用傅里叶透射红外变换(FTIR)光谱、N2吸附-脱附、X射线衍射(XRD)、扫描电镜(SEM)、拉曼光谱(Raman)、X射线光电子能谱(XPS)及NH3程序升温脱附(NH3-TPD)的表征手段, 对催化剂的结构性质和SCR性能进行了系统分析. 结果表明, 适量Al的掺杂能提高MnOx/SBA-15催化剂的SCR活性, 当硅铝摩尔比为50时, 催化剂活性最佳. 表征结果显示, Al掺杂后, 催化剂仍保持良好的骨架结构, 较大比表面、孔容和孔径, 并且Mn在催化剂表面富集, 由低价态转化为高价态, MnO2为催化剂的主要活性相. 此外, Al的掺杂使MnOx在催化剂表面高度分散, 表面酸性增强, 从而提高了催化剂的SCR活性.
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| 关 键 词： | 乙酰丙酮锰 铝 SBA-15 高分散性 表面酸性 选择性催化还原 |
| 收稿时间： | 2012-08-13 |
| 修稿时间： | 2012-10-09 |
Structural Properties of MnOx/Al-SBA-15 in Low-Temperature Selective Catalytic Reduction of NOx with NH3 |
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| HUANG Ping,PAN Si-Wei,HUANG Bi-Chun,CHENG Hua,YE Dai-Qi,WU Jun-Liang,FU Ming-Li,LU Sheng-Liang.Structural Properties of MnOx/Al-SBA-15 in Low-Temperature Selective Catalytic Reduction of NOx with NH3[J].Acta Physico-Chimica Sinica,2013,29(1):176-182. |
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| Authors: | HUANG Ping PAN Si-Wei HUANG Bi-Chun CHENG Hua YE Dai-Qi WU Jun-Liang FU Ming-Li LU Sheng-Liang |
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| Institution: | 1.College of Environmental Science & Engineering, South China University of Technology, Guangzhou 510006, P. R. China;2.Electric Power Research Institute of Guangdong Power Grid Corporation, P. R. China;3.Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, P. R. China;4.Guangzhou Environment Protection Investment Co. Ltd., Guangzhou 510700, P. R. China |
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| Abstract: | A series of MnOx/Al-SBA-15 catalysts were prepared by post synthesis methods for lowtemperature selective catalytic reduction (SCR) of NOx with NH3. Structural properties and catalytic performance were comprehensively characterized by Fourier transform infrared (FTIR) spectroscopy, N2 adsorption-desorption, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and temperature programmed desorption of NH3 (NH3-TPD). The results showed that moderate addition of Al improved the SCR activity of the MnOx/SBA-15 catalyst, and the MnOx/Al-SBA-15 catalyst with nSi/nAl=50 had the highest activity. Characterization results revealed that the doped material MnOx/Al-SBA-15 catalysts maintained high specific surface area, large pore volume, and uniform pore size. Al doping improved the concentration and valence state of Mn, where MnO2 was determined to be the main active phase. Owing to a high dispersion of MnOx and a stronger surface acidity, the MnOx/Al(50)-SBA-15 catalyst exhibited higher SCR activity. |
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| Keywords: | Acetyl acetone manganese Aluminum SBA-15 High dispersion Surface acidity Selective catalytic reduction |
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