Citation: YU Zai-Lu, XIE Peng-Fei, TANG Xing-Fu, YUE Ying-Hong, HUA Wei-Ming, GAO Zi. Selective Catalytic Reduction of NO with NH₃ over MnO_x-CeO₂-WO₃-ZrO₂：Effect of Calcination Temperature[J]. Acta Physico-Chimica Sinica, ;2014, 30(6): 1175-1179. doi: 10.3866/PKU.WHXB201404171 shu

Selective Catalytic Reduction of NO with NH₃ over MnO_x-CeO₂-WO₃-ZrO₂：Effect of Calcination Temperature

1.
1 Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, P. R. China;
2 Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P. R. China

Received Date: 10 March 2014
Available Online: 17 April 2014
Fund Project:

MnO_x-CeO₂-WO₃-ZrO₂ catalysts were prepared by co-precipitation and calcined at various temperatures (500, 600, 700, and 800 ℃). The effect of calcination temperature on their performance in the selective catalytic reduction (SCR) of NO with ammonia in the presence of O₂ and H₂O was investigated. The structural and physicochemical characterization of the catalysts were performed by N₂ adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), NH₃ temperature-programmed desorption (NH₃-TPD), and CO pulse reaction. The results show that the low temperature activity decreased with an increase in the calcination temperature, which is due to a decrease in the amount of surface chemisorbed oxygen and acid sites. As the calcination temperature increased the high temperature activity first increased and then decreased, which is contrary to the variation found for the most readily releasable oxygen on the catalyst surface. The catalyst calcined at 700 ℃ exhibited od low temperature activity and had the widest reaction temperature window. The light-off temperature (50% NO conversion) was 189 ℃ for this catalyst and the NO conversion was 80%-100% between 218 and 431 ℃ at a space velocity of 90000 h^-1.
- Nitrogen oxide,
- Selective catalytic reduction,
- Manganese oxide,
- Cerium oxide,
- WO₃-ZrO₂,
- Co-precipitation method
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沈阳化工大学材料科学与工程学院沈阳 110142

Selective Catalytic Reduction of NO with NH3 over MnOx-CeO2-WO3-ZrO2：Effect of Calcination Temperature

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通讯作者: 陈斌, bchen63@163.com

Selective Catalytic Reduction of NO with NH₃ over MnO_x-CeO₂-WO₃-ZrO₂：Effect of Calcination Temperature