Novel CuO@TiO2 Core–Shell Nanostructure Catalyst for Selective Catalytic Reduction of NOx with NH3

CuO@TiO 2 core–shell nanostructure catalyst with CuO core and TiO 2 shell was prepared by a two-step method and then used in NH 3 -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 TiO 2 and thus forming a core–shell nanostructure. According to the results of N 2 adsorption–desorption, XRD, Raman, XPS, NH 3 -TPD, H 2 -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 NO x species on the catalyst. Thus, the core–shell nanostructure catalyst presented significantly higher activity than pure CuO and TiO 2 . NH 3 -SCR reaction on CuO@TiO 2 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. Graphic Abstract