SCR of NOx by NH3 over MnFeOx@TiO2 catalyst with a core-shell structure: The improved K resistance |
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| Authors: | Chun-ying Huang Rui-tang Guo Wei-guo Pan Xiao Sun Shuai-wei Liu Jian Liu Zhong-yi Wang Xu Shi |
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| Affiliation: | 1. School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, PR China;2. Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai, PR China |
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| Abstract: | Some fly ash components such as K could seriously weaken the catalytic performance of SCR catalyst. In this study, the core-shell-structured [email protected]2 catalyst is synthesized by dipping deposition method and used for the NH3-SCR reaction. The results show that [email protected]2 catalyst exhibits higher K resistance than MnFeOx/TiO2 catalyst prepared by impregnation method. And the correlativity between the core-shell morphology and K resistance of [email protected]2 catalyst is studied by TEM, N2 adsorption, XRD, XPS, TPR, TPD and in situ DRIFT. It can be found that the shell of TiO2 has a protective effect on the active species in [email protected]2 catalyst. And the core-shell structure of [email protected]2 catalyst can produce more Mn4+ and chemisorbed oxygen species on its surface, improving reducibility and surface acidity. Moreover, the core-shell structure of [email protected]2 catalyst is beneficial to the adsorption of NH3 and the formation of NO2, resulting in the favored SCR reaction via the Eley?Rideal and the Langmuir?Hinshelwood routes. Therefore, [email protected]2 catalyst shows excellent K tolerance. |
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| Keywords: | Corresponding author. School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, PR China. SCR Core-shell structure K resistance |
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