The Cover Feature portrays two Cu^II ions as trapeze artists swinging inside a CHA zeolite cage until they join hands to form a single complex. In their Communication, reporting CO titration experiments over preoxidized Cu‐CHA catalysts, R. Villamaina et al. provide evidence that NH₃ ligands, like trapezes, mobilize initially isolated Cu^II ions to form the dimeric complexes with removable oxygen needed for CO oxidation. This is confirmed by transient kinetic analysis, which shows that the rate of Cu^II reduction is 2^nd order in the ZCu^IIOH species. These findings may be relevant for elucidation of the reduction half cycle in the redox mechanism of the Standard NH₃‐SCR reaction over Cu‐CHA systems. More information can be found in the Communication by R. Villamaina et al.

中文翻译：

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NH3存在下Cu-CHA催化剂上的低T CO氧化：探讨CuII离子的迁移率和多核CuII物种的作用

Cover Feature描绘了两个Cu ^II离子，它们是在CHA沸石笼中摆动的空中飞人，直到他们联手形成一个复合物。R. Villamaina等人在他们的通讯中报告了在预氧化的Cu-CHA催化剂上进行CO滴定实验。提供的证据表明，NH ₃配体像梯形一样，会动员最初分离的Cu ^II离子与CO氧化所需的可去除氧形成二聚体配合物。这是通过瞬态动力学分析，这表明Cu的速率确认^II减少为2^次的顺序ZCu ^II OH物种。这些发现可能与阐明标准NH的还原半衰期有关在Cu‐CHA系统上进行₃ ‐SCR反应。有关更多信息，请参见R. Villamaina等的《通讯》。