Adsorbate Ordering Effects in the Trimerization Reaction of Acetylene on Cu(100)
Adsorbate Ordering Effects in the Trimerization Reaction of Acetylene on Cu(100)
复制标题
乙炔在 Cu(100) 上三聚反应中的吸附有序化效应
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. Hrbek
中科院分区：
文献类型：
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作者：
J. Dvorak;J. Hrbek
报道了乙炔在Cu（100）表面三聚制苯的反应。根据覆盖范围的不同，反应可以在室温下进行，也可以在200k或以下进行。反应产率表现出较强的覆盖依赖性，随着初始乙炔覆盖的增加，产率也随之增加。室温反应产率最高可达30%。用LEED对乙炔覆盖层的结构性质进行了研究，结果与反应产率的观测结果相吻合。从Cu（110）和Pd（111）对同一反应苯产率的覆盖依赖性的角度讨论了结果。发现三种不同表面上乙炔覆盖层的结构排列解释了反应产率的不同覆盖依赖性。在该体系的热解吸数据中观察到一个独特的特征；质量26的信号在高覆盖率时模拟三聚化反应速率。这很可能是由于苯的放热性。
The trimerization of acetylene to benzene on a Cu(100) surface is reported. The reaction occurs at both room temperature and at or below 200 K depending on the coverage. The reaction yield exhibits a strong coverage dependence, with the yield increasing as the initial acetylene coverage increases. The maximum yield for the room temperature reaction is 30%. The structural properties of the acetylene overlayer have been investigated by LEED, and the results correlated with the reaction yield observations. The results are discussed in light of the coverage dependence of the benzene yield for the same reaction on Cu(110) and Pd(111). It is found that the structural arrangement of the acetylene overlayer on the three different surfaces explains the different coverage dependences of the reaction yield. A unique feature is observed in the thermal desorption data for this system; the mass 26 signal mimics the trimerization reaction rate at high coverages. This is most likely due to the exothermicity of the benzen...