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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Vibrational Study of the Interaction of Acetylene and Benzene on Clean and Carbide-Modified W(211) Surfaces
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Vibrational Study of the Interaction of Acetylene and Benzene on Clean and Carbide-Modified W(211) Surfaces

机译:乙炔和苯在清洁和碳化物修饰的W(211)表面上相互作用的振动研究

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摘要

As a part of a continuing investigation of acetylene reactions on tungsten surfaces covered by ultrathin metal films, the chemistry of acetylene on clean and carbide-modified W(211) surfaces has been investigated using high-resolution electron energy-loss spectroscopy (HREELS) and temperature-programmed desorption (TPD) measurements. Acetylene decomposes between 100 and 450 K on the clean W(211) surface, ultimately forming carbidic carbon and gaseous hydrogen. During this decomposition process, a mixture of different hydrocarbon fragments are formed, most likely vinylidene (CCH↓(2)) or vinyl (HCCH↓(2)) and acetylide (CCH). On the carbide-modified W(211) surface, acetylene also decomposes to 'produce carbon and gaseous hydrogen. However, compared to clean W(211), the CH bond activation is suppressed on the carbide-modified W surface, as evidenced by the broadening and significant shifting of the H↓(2) TPD features toward higher temperatures as well as by the HREEL spectra monitoring the thermal decomposition of acetylene on the carbide-modified W(211) surface.
机译:作为对超薄金属膜覆盖的钨表面上的乙炔反应的持续研究的一部分,已使用高分辨率电子能量损失谱(HREELS)和电离能谱研究了清洁和经碳化物改性的W(211)表面上的乙炔化学。程序升温解吸(TPD)测量。乙炔在干净的W(211)表面上分解100至450 K,最终形成碳化碳和气态氢。在此分解过程中,形成了不同烃片段的混合物,最可能是亚乙烯基(CCH↓(2))或乙烯基(HCCH↓(2))和乙炔化物(CCH)。在碳化物改性的W(211)表面上,乙炔也分解产生碳和气态氢。但是,与纯净的W(211)相比,碳化物改性的W表面上的CH键活化受到抑制,这由H↓(2)TPD特征向着较高温度以及HREEL的扩展和显着移动所证明。光谱监测乙炔在碳化物修饰的W(211)表面上的热分解。

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