采用密度泛函理论研究了CO气氛对FeO(1 11)/Ru(0001)负载Au原子吸附位、电荷及其稳定性的影响.首先考察了FeO(111)单层薄膜在Ru(0001)表面上的界面结构.研究发现,表面莫尔超晶胞内的HCP区域有最小的Fe-O层间距(rumpling),且Fe和O原子均与衬底Ru形成化学键.Au原子在FeO/Ru(0001)上最稳定的吸附在HCP区域的Fe-bridge位.其中,Au原子诱导两个Fe原子从O原子层的下面翻转到其上面,形成两个Au-Fe键,且Au带负电.当把体系暴露在CO气氛下后,CO能诱导Au原子从原来最稳定的Fe-bridge位转移到其邻近的O-top位,伴随着Au的电荷从负变到正,形成非常稳定的Au+-CO羰基物.结果表明,反应气氛对负载金属催化剂的化学状态及其稳定性的影响很大;同时也强调了反应条件下催化剂原位表征的重要性.
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