Novel CuO@TiO2 Core-Shell Nanostructure Catalyst for Selective Catalytic Reduction of NOx with NH3
Novel CuO@TiO2 Core-Shell Nanostructure Catalyst for Selective Catalytic Reduction of NOx with NH3
复制标题
新型 CuO@TiO2 核壳纳米结构催化剂用于 NH3 选择性催化还原 NOx
DOI：
10.1007/s10562-020-03515-2
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发表时间：
2021
影响因子：
2.8
通讯作者：
He Chi
中科院分区：
文献类型：
--
作者：
Zhang Jiali;Tian Hua;Yu Yanke;Jiang Zeyu;Ma Mudi;He Chi
采用两步法制备了以CuO为核、TiO 2为壳的CuO@TiO2核壳纳米结构催化剂，并将其用于NH3-SCR反应。利用FE-SEM、TEM和元素分析等手段对样品的形貌进行了研究。他们的结果表明CuO纳米棒被TiO 2包覆，从而形成核壳纳米结构。N2吸附-脱附、XRD、拉曼、XPS、NH3-TPD、H2-TPR和原位DRIFTS等测试结果表明，核壳结构有利于催化剂上形成更好的氧化还原能力、更多的氧空位、更多的酸中心和丰富的NOx吸附物种。因此，核壳纳米结构催化剂的活性明显高于纯CuO和TiO 2。CuO@ TiO 2核壳催化剂上的NH3-SCR反应既遵循Eley-Rideal（E-R）机理，又遵循Langmuir-Hinshewood（L-H）机理。这些研究结果对开发新型高效的非钒基SCR催化剂具有一定的促进作用。
CuO@TiO2core–shell nanostructure catalyst with CuO core and TiO2shell 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 TiO2and thus forming a core–shell nanostructure. According to the results of N2adsorption–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 NOxspecies on the catalyst. Thus, the core–shell nanostructure catalyst presented significantly higher activity than pure CuO and TiO2. NH3-SCR reaction on CuO@TiO2core–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.Graphic Abstract