Cyclotrimerization of Alkynes on Reduced TiO2(001) Surfaces
Cyclotrimerization of Alkynes on Reduced TiO2(001) Surfaces
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DOI：
10.1021/j100065a052
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发表时间：
1994-04
期刊：
影响因子：
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通讯作者：
Keith G. Pierce;M. Barteau
中科院分区：
文献类型：
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作者：
Keith G. Pierce;M. Barteau
采用程序升温脱附（TPD）技术研究了简单炔（乙炔、丙炔和2-丁炔）在不同还原态TiO 2（001）表面上的反应活性。在每种情况下，主要的反应途径是环三聚形成芳族化合物（苯从乙炔，三甲基苯从丙炔，和六甲基苯从2-丁炔），选择性在51%和86%之间。其他不太普遍的反应包括还原二聚成开链二烯和氢化成烯烃。环化反应的选择性随着反应物碳数的增加而增加，而烯烃和二烯产物的选择性随着反应物碳数的增加而降低，炔吸附层的转化率也随着反应物碳数的增加而降低
The reactivity of simple alkynes (acetylene, propyne, and 2-butyne) on various reduced TiO 2 (001) surfaces was investigated using temperature-programmed desorption (TPD). The predominant reaction pathway in each case was cyclotrimerization to form aromatic compounds (benzene from acetylene, trimethylbenzene from propyne, and hexamethylbenzene from 2-butyne) with selectivities between 51% and 86%. Other less prevalent reactions included reductive dimerization to open chain dienes and hydrogenation to olefins. The selectivity for cyclization increased with reactant carbon number for the series above, while those of the olefin and diene products decreased, as did the fraction of the alkyne adlayer converted