Oxidation of Styrene and Phenylacetaldehyde on Ag(111): Evidence for Transformation of Surface Oxametallacycle
Oxidation of Styrene and Phenylacetaldehyde on Ag(111): Evidence for Transformation of Surface Oxametallacycle
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Ag(111) 上苯乙烯和苯乙醛的氧化：表面氧杂金属环转化的证据
DOI：
10.1021/jp7119558
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发表时间：
2008
影响因子：
3.7
通讯作者：
R. Madix
中科院分区：
文献类型：
--
作者：
Ling Zhou;R. Madix
苯乙醛的氧化已被用来帮助确定参与苯乙烯二次氧化反应的中间体。除了对苯乙烯、苯乙烯和苯乙醛的环氧化反应外，在含氧银(111)上也发生了相同的二次氧化反应，生成了CO2、H2O、苯甲酸、苯、苯、联苯和少量的苯乙酸。在苯乙烯在Ag(111)上的氧化反应中，除了草三环和苯甲酸酯中间体外，还发现了一种稳定的燃烧中间体。草胺环和燃烧中间体分别演化为环氧苯乙烷或其他二次氧化产物。同位素标记和X-射线光电子能谱研究表明，表面氧金属环向燃烧中间体的转化对决定苯乙烯环氧化的选择性具有重要的动力学意义。
The oxidation of phenylacetaldehyde has been used to help identify intermediates involved in the secondary oxidation reactions of styrene. Besides the epoxidation reaction found for styrene, styrene and phenylacetaldehyde undergo the same secondary oxidation reactions on oxygen-covered Ag(111) to produce CO2, H2O, benzoic acid, benzene, phenyl, biphenyl, and a small amount of benzeneacetic acid. In addition to oxametallacycle and benzoate intermediates, a stable combustion intermediate is identified in the oxidation of styrene on Ag(111). The oxametallacycle and the combustion intermediate evolve into styrene oxide or into other secondary oxidation products, respectively. Isotopic labeling and X-ray photoelectron studies show that the transformation of surface oxametallacycle to the combustion intermediate is kinetically important in determining the selectivity of styrene epoxidation.