Abstract A series of three-dimensional ordered macroporous (3DOM) MFe2O4 spinel catalysts are synthesized for CO oxidation and selective catalytic reduction of NOx by CO. Co and Ni did not have a good synergy with Fe, respectively, and the reduction performance of the corresponding spinel oxides is also lower than that of pure Fe2O3. However, the introduction of Cu into Fe to form spinel catalysts not only promotes the reduction performance, but also improves the surface active oxygen species, and the optimum CuFe2O4 catalyst has the highest catalytic activity in both reactions. Moreover, the appearance of Cu+–CO species in the reactions is the reason why CuFe2O4 catalyst has better catalytic activity than other catalysts at lower temperature. At the same time, the existence of oxygen vacancies at higher temperatures is conducive to the activation of O2 molecule in CO oxidation and the dissociation of NO molecule in NO + CO reaction. It is noteworthy that both reactions on CuFe2O4 catalyst follow both Langmuir-Hinshlwood (L-H) and Eley-Rideal (E-R) mechanisms.

中文翻译：

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三维有序大孔MFe2O4(M=Co,Ni,Cu)尖晶石催化剂的制备及其在CO氧化和NO+CO反应中的同步催化应用

摘要 合成了一系列三维有序大孔 (3DOM) MFe2O4 尖晶石催化剂，用于 CO 氧化和 CO 选择性催化还原 NOx。Co 和 Ni 分别与 Fe 没有很好的协同作用，相应的还原性能尖晶石氧化物也低于纯 Fe2O3。然而，将Cu引入Fe中形成尖晶石催化剂不仅促进了还原性能，而且提高了表面活性氧物种，最佳的CuFe2O4催化剂在这两种反应中的催化活性都最高。此外，Cu+-CO 物种在反应中的出现是 CuFe2O4 催化剂在较低温度下比其他催化剂具有更好催化活性的原因。同时，较高温度下氧空位的存在有利于CO氧化中O2分子的活化和NO+CO反应中NO分子的解离。值得注意的是，CuFe2O4 催化剂上的两种反应都遵循 Langmuir-Hinshlwood (LH) 和 Eley-Rideal (ER) 机制。