探讨负载型金属氧化物催化剂的表面组分与载体之间的相互作用,有助于理解相关催化剂的催化作用本质.近年来,我们对单组分CuO以及双组分CuO-Mn2O3,CuO-CoO等金属氧化物在γ-Al2O3载体表面的分散行为和存在状态,及其物理化学性质和催化性能(CO+O2和NO+CO模型反应)进行了研究.结果表明,这些金属氧化物在γ-Al2O3载体表面的分散行为和所得负载型催化剂样品的一些物理化学性质及其催化性能均可参照“嵌入模型”来解释.在此基础上,我们讨论了这些样品的“组成-结构-性质”间的关系,并针对表面负载双组分金属氧化物样品提出了表面协同氧空位参与的NO+CO反应机理.
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