Copper-based materials are promising catalysts in the selective catalytic oxidation of ammonia into nitrogen and water vapour (NH₃-SCO). Investigations under applied reaction conditions over such materials seem to be rare and a comprehensive understanding of the involved active copper oxide species could facilitate a knowledge-based catalyst optimization. In the present work, Cu-Mg-Al-O_x mixed metal oxides and Cu/Al₂O₃ active catalysts in NH₃-SCO were investigated under NH₃/O₂/CO₂/H₂O/N₂ reaction conditions. Powder XRD, BET, NH₃-TPD, H₂-TPR and XAFS methods were used to characterize Cu-Mg-Al-O_x (Cu/Mg/Al = 8/63/29, mol%) and 10 wt% Cu/Al₂O₃. Cu-Mg-Al-O_x hydrotalcite derived mixed metal oxides were obtained by coprecipitation, while Cu/Al₂O₃ was prepared by incipient wetness impregnation. A highly dispersed copper oxide species formed on Cu-Mg-Al-O_x, while a mixture of highly dispersed (CuO_x) and bulk copper oxide species (CuO and CuAl₂O₄) formed on Cu/Al₂O₃. The comparison of Cu-Mg-Al-O_x and Cu/Al₂O₃ in NH₃-SCO provided good insight into the nature of the active species present in both copper-based catalysts. It was found that highly dispersed easily reducible copper oxide species and bulk copper oxide species appear as active species under NH₃/O₂/N₂ and NH₃/O₂/CO₂/H₂O/N₂ reaction conditions, respectively.

铜基材料是将氨选择性催化氧化为氮气和水蒸气（NH ₃ -SCO）的有前途的催化剂。在这种材料的应用反应条件下进行的研究似乎很少，对所涉及的活性氧化铜物质的全面理解可以促进基于知识的催化剂优化。在目前的工作中，在NH ₃ / O ₂ / CO ₂ / H ₂ O / N ₂反应条件下，研究了NH ₃ -SCO中的Cu-Mg-Al-O _x混合金属氧化物和Cu / Al ₂ O ₃活性催化剂。。粉末XRD，BET，NH ₃ -TPD，H ₂-TPR和XAFS方法用于表征Cu-Mg-Al-O _x（Cu / Mg / Al ＝ 8/63/29，mol％）和10wt％的Cu / Al ₂ O ₃。通过共沉淀获得Cu-Mg-Al-O _x水滑石衍生的混合金属氧化物，而通过初期湿润浸渍制备Cu / Al ₂ O ₃。在Cu-Mg-Al-O _x上形成了高度分散的氧化铜物质，而在Cu / Al ₂ O ₃上形成了高度分散的（CuO _x）和块状氧化铜物质（CuO和CuAl ₂ O ₄）的混合物。Cu-Mg-Al-O _x和Cu / Al ₂ O的比较₃在NH ₃ - SCO提供了良好的洞察存在于铜基催化剂的活性物种的性质。发现在NH ₃ / O ₂ / N ₂和NH ₃ / O ₂ / CO ₂ / H ₂ O / N ₂反应条件下，高度分散的易还原的氧化铜物种和块状氧化铜物种分别作为活性物种出现。