Preparation and Characterization of MnO_X-CeO₂/TiO₂ Catalytic Material for SCR of NO_X with NH₃ at Low Temperature

Abstract:

The MnO_X-CeO₂/TiO₂ catalytic material for low temperature SCR of NO_X with NH₃ was prepared using aqueous solutions of three manganese salt as well as cerous nitrate and TiO₂(anatase) powder by impregnation method. The properties of the catalytic materials were investigated by TG-DSC, XRF, XRD, XPS, BET and SEM. And the low temperature catalytic activity of the catalytic materials was measured. The results showed that, when manganese nitrate and manganese chloride and manganese acetate were used as precursors, respectively, the primary phases of catalytic materials were MnOx/MnO₂, MnO₂/Mn₈O₁₀Cl₃ and Mn₃O₄/MnO₂, the surface Mn/Ti molar ratio were 0.68, 0.19 and 0.88, the surface area were 45.1m2/g, 25.1 m2/g and 48.6 m2/g ,respectively. The optimum NO_X conversion rate of catalytic material from manganese nitrate precursor and manganese chloride precursor and manganese acetate precursor were 97.9% at 483K, 86.6% at 513K, 97.2% at 423K, respectively. Consequently, the higher low-temperature activity of MnO_X-CeO₂/TiO₂ from manganese acetate precursor may be attributed to higher surface and higher surface concentration of activity component.

• Periodical: Materials Science Forum (Volumes 743-744)
• Pages: 198-203
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.743-744.198
• Online since: January 2013
• Authors: Qi Dong Liu, Su Ping Cui, Hong Xia Guo, Ya Li Wang, Yun Feng Zhang
• Keywords: Catalytic Material, Low-Temperature SCR, MnO_X-CeO₂/TiO₂, NO Conversion

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