ABSTRACT To investigate the effect of synthesis approach on the structural and catalytic properties, CoAl2O4/CuFe2O4/CeO2/Ti O2 ceramic nanocomposite was synthesized by four liquid phase routes: mixing of components in the liquid phase ( method 1), mixing of CoAl2O4 precursor with other components (method 2), mixing of CoAl2O4 and CuFe2O4 precursors with other components ( method 3) and mixing of Cu Fe2O4 precursor with other components (method 4). The catalytic activity of the synthesized nanocomposites was evaluated for the selective catalytic reduction of NO by NH3 (NH3-SCR). The characteristics, such as chemical composition, phase analysis, particle size distribution, specific surface area, average pore diameter, agglomeration degree, and surface acidity were comparatively studied for the synthesized ceramic nanocomposites. The results obtained from the structural studies and the NH3-SCR evaluation revealed that the nanocomposite fabricated by method 4 displayed the best structural properties and the highest catalytic activity among all the synthesized samples. GRAPHICAL ABSTRACT

中文翻译：

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合成 CoAl2O4/CuFe2O4/CeO2/TiO2 陶瓷纳米复合材料作为 NH3 选择性催化还原 NO 的催化剂：合成路线的影响

摘要 为了研究合成方法对结构和催化性能的影响，通过四种液相途径合成了 CoAl2O4/CuFe2O4/CeO2/Ti O2 陶瓷纳米复合材料：液相中的组分混合（方法 1），CoAl2O4 前驱体与其他组分（方法 2），CoAl2O4 和 CuFe2O4 前体与其他组分的混合（方法 3）以及 Cu Fe2O4 前体与其他组分的混合（方法 4）。对合成的纳米复合材料的催化活性进行了评估，用于通过 NH3 (NH3-SCR) 选择性催化还原 NO。对合成的陶瓷纳米复合材料的化学成分、物相分析、粒径分布、比表面积、平均孔径、团聚度、表面酸性等特性进行了比较研究。从结构研究和 NH3-SCR 评估中获得的结果表明，方法 4 制备的纳米复合材料在所有合成样品中显示出最好的结构性能和最高的催化活性。图形概要