Study of Co-Mn/TiO₂ SCR Catalyst at Low Temperature

Abstract:

The Co-Mn/TiO₂ catalysts with different contents of Co were prepared by the impregnation method. Catalytic activity tests showed that the addition of Co could obviously enhance the SCR performance of Mn/TiO₂ catalyst, and the NO conversion of 0.05Co-Mn/TiO₂ samples could reach 94.03% at 180 °C. At the same time, with the help of XRD, BET, H₂-TPR and NH₃-TPD, the various physical and chemical characteristics as well as phase structures of catalysts were characterized systematically. According to the results, the formations of crystalline CoMn₂O₄, Mn₃O₄ and amorphous Mn₂O₃ were detected. Furthermore, Co doping could reduce the reduction temperatures of catalysts and enhance the adsorption capacities of NH₃, resulting in the excellent SCR performance at low temperature.

• Periodical: Advanced Materials Research (Volume 1102)
• Pages: 11-16
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1102.11
• Online since: May 2015
• Authors: Hua Hu, Jun Lin Xie, De Fang, Feng He*
• Keywords: Co Doping, CoMn₂O₄ , MnOx/TiO₂ , SCR

References

[1] W. Zhou, X.S. Wang, Y.H. Zhang, et al. Current status of nitrogen oxides related pollution condition in China and integrated control strategy. J. Peking. Univ., 44 (2008) 323-323.

[2] K.Q. Sun, Q. Zhong. Technologies and application of flue gas denitrification in thermal power plants. Chem. Ind. Pre., Beijing, (2006).

[3] Y.J. Gao. Research on the preparation and denitrification performance of low temperature SCR catalyst. Nanjing Univ. Sci. & Tech., (2009).

[4] B.J. Wu, S.G. Wang, Z.X. Fang, et al. Technologies of flue gas denitrification and their chemical reaction aspects. J. Therm. Power Gener., 35 (2006) 59-64.

[5] Y.F. Jiao, X.T. Wang, S.L. Zhuang, et al. Research progress in Mn-based composite metal oxide catalysts for low-temperature selective catalytic reduction of NOx. J. Boi. Tech., 5 (2012) 66-66.

[6] H.D. Xu, C.T. Qiu, Q.L. Zhang, et al. Influence of tungsten oxide on selective catalytic reduction of NOx with NH3 over MnOx-CeO2/ZrO2-TiO2 monolith catalyst. Acta. phys-Chim. Sin., 26 (2010) 2449-2454.

DOI: 10.1016/j.cattod.2011.05.009

[7] J.L. Xie, D. Fang, F. He, et al. Performance and mechanism about MnOx species included in MnOx/TiO2 catalysts for SCR at low Temperature. Catal. Commun., 28 (2012) 77-81.

DOI: 10.1016/j.catcom.2012.08.022

[8] D. Fang, J.L. Xie, H. Hu, et al. Influence of the valence state of manganese ion on the activity of Mn supported catalysts for denitration. J. Wuhan Univ. Technol. -Mater. Sci., 35 (2013) 37-40.

[9] W.Q. Xu, J. Zhao, H.R. Wang, et al. Catalytic oxidation activity of NO on TiO2-Supported Mn-Co composite oxide catalysts. Acta. phys-Chim. Sin., 29 (2013) 385-390.

[10] M.H. Kim, K.H. Choo. Low-temperature continuous wet oxidation of trichloroethylene over CoOx/TiO2 catalysts. Catal. Commun., 8 (2007) 462-466.

DOI: 10.1016/j.catcom.2006.07.015

[11] D. Fang, J.L. Xie, D. Mei, et al. Effect of CuMn2O4 spinel in Cu-Mn oxides catalysts on selective catalytic reduction of NOx with NH3 at low temperature. Rsc. Adv., 4 (2014) 25540-2551.

DOI: 10.1039/c4ra02824d

[12] Y. Doggali, Y. Teraoka, R. Mungse, et al. Combustion of volatile organic compounds over Cu–Mn based mixed oxide type catalysts supported on mesoporous Al2O3, TiO2 and ZrO2. J. Mol. Catal. A: Chem., 358 (2012) 23-30.

DOI: 10.1016/j.molcata.2012.02.004

[13] W.S. Kijlstra, D.S. Brands, H.I. Smit, et al. Mechanism of the selective catalytic reduction of NO by NH3 over MnOx/Al2O3. Catal., 171 (1997) 219-230.

DOI: 10.1006/jcat.1997.1789