ABSTRACT

Au@Cu_xO core-shell structure nanoparticles (NPs) have been designed and used for CO catalytic combustion to improve Au catalysts’ activity and stability and decrease the cost. The catalytic performance of Au@Cu_xO/Metal Oxide has been affected a lot by the Au NPs’ nature, the core-shell structural perfection, the shell thickness and the support type. It proved that Au particles prepared with neutral aqueous solution (pH = 7) is more feasible to be used as the active component of combustion catalysts. The suitable amount of Cu(NO₃)₂ used for Au@Cu_xO preparation has led to the formation of more core-shell structure NPs with thin shell thickness thus lead to high activity. Among all the oxides studied here, Co₃O₄ is the best catalyst support. Both the catalytic activity and stability of Au@Cu_xO/Co₃O₄ are high. The Au content in the catalysts is only 0.11 wt% and the 90% CO conversion temperature is 132°C. CO can even combust on Au@Cu_xO/Co₃O₄ at room temperature with 51% conversion and without any loss after 72-h reaction.

摘要

Au@Cu _x O核壳结构纳米粒子（NPs）已被设计并用于CO催化燃烧，以提高Au催化剂的活性和稳定性并降低成本。Au@Cu _x O/金属氧化物的催化性能受Au NPs的性质、核壳结构的完善程度、壳层厚度和载体类型的影响很大。证明用中性水溶液（pH=7）制备的Au颗粒更适合用作燃烧催化剂的活性组分。用于Au@Cu _x O制备的适量Cu(NO ₃ ) ₂导致形成更多核壳结构的具有薄壳厚度的NP，从而导致高活性。在这里研究的所有氧化物中，Co₃ O ₄是最好的催化剂载体。Au@Cu _x O/Co ₃ O ₄的催化活性和稳定性都很高。催化剂中金含量仅为 0.11 wt%，90% CO 转化温度为 132°C。CO 甚至可以在室温下在 Au@Cu _x O/Co ₃ O ₄上燃烧，转化率为 51%，并且在反应 72 小时后没有任何损失。