Citation: XU Wen-Qing, ZHAO Jun, WANG Hai-Rui, ZHU Ting-Yu, LI Peng, JING Peng-Fei. Catalytic Oxidation Activity of NO on TiO₂-Supported Mn-Co Composite Oxide Catalysts[J]. Acta Physico-Chimica Sinica, ;2013, 29(02): 385-390. doi: 10.3866/PKU.WHXB201212031 shu

Catalytic Oxidation Activity of NO on TiO₂-Supported Mn-Co Composite Oxide Catalysts

1.
1 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China;
2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 21 September 2012
Available Online: 3 December 2012
Fund Project: 国家高技术研究发展计划项目(863) (2011AA060802, 2012AA062501, 2012AA062803)资助 (863) (2011AA060802, 2012AA062501, 2012AA062803)

Globally, NO_x is one of the most widespread pollutants. It is generated mainly from the burning of fossil fuels, and NO is very difficult to remove because of its capacity to be dissolved in water. The catalytic oxidation method can be used to convert NO to NO₂, which is soluble in water and can be removed using desulfurization devices. Here, a series of TiO₂-supported Mn-Co composite oxide catalysts were prepared using the impregnation method. The results of catalytic activity tests showed that the addition of Mn enhanced the efficiency of NO oxidation. Significantly, with 6% doping amounts, Mn (0.3)-Co(0.7)/TiO₂ showed the best activity of 88% NO conversion at 300 ° C. X-ray diffraction (XRD), N₂ adsorption/desorption, hydrogen temperature-programmed reduction (H₂-TPR), oxygen temperatureprogrammed desorption (O₂-TPD), and in-situ diffuse reflectance Fourier transform infrared (in-situ DRFTIR) spectroscopy were used to characterize the catalysts. The results indicated that when the doping amount was 6%, the Mn enhanced the specific surface areas and pore volumes, which improved the dispersion of the active component over the TiO₂ support. The co-doping of manganese into the Co/TiO₂ also enhanced the oxygen desorption capabilities of the catalysts, which improved their reduction abilities. In addition, bridge NO₃^-, the key intermediate, was converted into NO₂; this conversion was also enhanced by the presence of Mn on the Co/TiO₂ catalyst. All of the above reasons account for the high NO catalytic oxidation activity of the supported Mn-Co composite oxide catalysts.
- Nitric oxide,
- Catalytic oxidation,
- Manganese,
- Cobalt,
- Nitrogen dioxide
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沈阳化工大学材料科学与工程学院沈阳 110142

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Catalytic Oxidation Activity of NO on TiO₂-Supported Mn-Co Composite Oxide Catalysts