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催化学报  2013 

NO在Cu(111)表面吸附和分解的XPS和TPD研究:不同氧物种的影响

DOI: 10.1016/S1872-2067(12)60585-3, PP. 964-972

Keywords: 一氧化氮,Cu(111)表面,氧物种,吸附,X射线光电子能谱,程序升温脱附谱

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Abstract:

?利用X射线光电子能谱和程序升温脱附谱研究了NO在清洁和预吸附氧的Cu(111)表面上的吸附和反应.通过改变NO的暴露量和退火温度,在Cu(111)表面可以制备出不同种类的化学吸附氧物种,其O1s的结合能分别位于531.0eV(O531)和529.7eV(O529).表面O531物种的存在对NO的不同吸附状态有着显著影响,同时使得大部分NO吸附分子(NO(a))在加热过程中发生分解并以N2O和N2形式脱附;而表面O529物种对NO(a)的解离脱附有着明显的抑制作用.相对于O531物种来说,O529物种对NO吸附表现出更强的位阻效应.上述结果表明,NO在Cu(111)表面的吸附和分解行为与预吸附氧物种的种类和覆盖度密切相关.

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