An extended N₂O titration method was applied to characterize high-performance, supported Cu catalysts: Cu/ZnO:Al (68/29/3), Cu/ZnO (80/20) and Cu/MgO (80/20). Calculation of the oxygen diffusion coefficients showed significant differences within the series of catalysts, particularly as a function of temperature. The diffusion kinetics follows a parabolic law similar to previous high temperatures studies. The apparent activation energies of the oxygen diffusion correlate inversely with the strength of the metal support interaction. The metal-support-interaction is described by means of complementary techniques as complex interplay between structural and electronic effects located at the Cu-metal oxide interface. The significance of the metal-support-interaction, identified as relevant for the reduction and oxidation of the metallic Cu, correlates with the activity in catalytic CO oxidation. It is evident that the oxygen diffusion coefficient is indicative of the tendency of the Cu catalyst to withstand transformation into the oxides under oxidative reaction conditions controlled by the corresponding Cu-support-interaction.

扩展的N ₂采用O滴定法表征了负载型高性能Cu催化剂：Cu / ZnO：Al（68/29/3），Cu / ZnO（80/20）和Cu / MgO（80/20）。氧扩散系数的计算显示出一系列催化剂之间的显着差异，尤其是温度的函数。扩散动力学遵循类似于先前高温研究的抛物线定律。氧扩散的表观活化能与金属载体相互作用的强度成反比。金属-载体-相互作用通过互补技术描述为位于Cu-金属氧化物界面的结构效应和电子效应之间的复杂相互作用。与金属铜的还原和氧化有关的金属-载体相互作用的重要性，与催化CO氧化的活性相关。显然，氧的扩散系数表明了在由相应的铜-载体-相互作用控制的氧化反应条件下，铜催化剂承受转变成氧化物的趋势。