表面缺陷在甲醇在FeO(001)上吸附中的作用
The Role of Surface Defects in the Adsorption of Methanol on FeO(001).
作者信息
Gamba Oscar, Hulva Jan, Pavelec Jiri, Bliem Roland, Schmid Michael, Diebold Ulrike, Parkinson Gareth S
机构信息
Institute of Applied Physics, TU Wien, Vienna, Austria.
出版信息
Top Catal. 2017;60(6):420-430. doi: 10.1007/s11244-016-0713-9. Epub 2016 Sep 13.
The adsorption of methanol (CHOH) at the FeO(001)-(√2 × √2)R45° surface was studied using X-ray photoelectron spectroscopy, scanning tunneling microscopy, and temperature-programmed desorption (TPD). CHOH adsorbs exclusively at surface defect sites at room temperature to form hydroxyl groups and methoxy (CHO) species. Active sites are identified as step edges, iron adatoms, antiphase domain boundaries in the (√2 × √2)R45° reconstruction, and above Fe atoms incorporated in the subsurface. In TPD, recombinative desorption is observed around 300 K, and a disproportionation reaction to form methanol and formaldehyde occurs at 470 K.
采用X射线光电子能谱、扫描隧道显微镜和程序升温脱附（TPD）研究了甲醇（CH₃OH）在FeO(001)-(√2 × √2)R45°表面的吸附情况。在室温下，CH₃OH仅吸附在表面缺陷位点上，形成羟基和甲氧基（CH₃O）物种。活性位点被确定为台阶边缘、铁吸附原子、(√2 × √2)R45°重构中的反相畴界以及次表面中掺入的铁原子上方。在TPD中，在300 K左右观察到重组脱附，在470 K发生歧化反应生成甲醇和甲醛。
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