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Novel CuO@TiO2 Core–Shell Nanostructure Catalyst for Selective Catalytic Reduction of NOx with NH3
Catalysis Letters ( IF 2.8 ) Pub Date : 2021-01-07 , DOI: 10.1007/s10562-020-03515-2
Jiali Zhang , Hua Tian , Yanke Yu , Zeyu Jiang , Mudi Ma , Chi He

CuO@TiO2 core–shell nanostructure catalyst with CuO core and TiO2 shell was prepared by a two-step method and then used in NH3-SCR reaction. FE-SEM, TEM and element mapping were used to investigate the morphologies of the sample. Their results indicated CuO nanorods were coated with TiO2 and thus forming a core–shell nanostructure. According to the results of N2 adsorption–desorption, XRD, Raman, XPS, NH3-TPD, H2-TPR and in situ DRIFTS, the core–shell nanostructure would benefit the formation of better redox ability, more oxygen vacancies, more acid sites and abundant adsorbed NOx species on the catalyst. Thus, the core–shell nanostructure catalyst presented significantly higher activity than pure CuO and TiO2. NH3-SCR reaction on CuO@TiO2 core–shell catalyst should follow both Eley–Rideal (E-R) mechanism and Langmuir-Hinshewood (L–H) mechanism. These findings may promote the development of the new effective non-vanadium-based SCR catalysts.

中文翻译:

用 NH3 选择性催化还原 NOx 的新型 CuO@TiO2 核壳纳米结构催化剂

通过两步法制备了具有 CuO 核和 TiO2 壳的 CuO@TiO2 核壳纳米结构催化剂,然后用于 NH3-SCR 反应。FE-SEM、TEM 和元素映射用于研究样品的形貌。他们的结果表明,CuO 纳米棒涂有 TiO2,从而形成核壳纳米结构。根据 N2 吸附-解吸、XRD、拉曼、XPS、NH3-TPD、H2-TPR 和原位 DRIFTS 的结果,核壳纳米结构有利于形成更好的氧化还原能力、更多的氧空位、更多的酸位和大量吸附在催化剂上的 NOx 物质。因此,核壳纳米结构催化剂的活性明显高于纯 CuO 和 TiO2。CuO@TiO2核壳催化剂上的NH3-SCR反应应遵循Eley-Rideal(ER)机制和Langmuir-Hinshewood(L-H)机制。
更新日期:2021-01-07
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