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首页> 外文期刊>Journal of mass spectrometry: JMS >A TPD-MS study of the interaction of coumarins and their heterocyclic derivatives with a surface of fumed silica and nanosized oxides CeO _2/SiO_2, TiO_2/SiO_2, Al _2O_3/SiO_2
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A TPD-MS study of the interaction of coumarins and their heterocyclic derivatives with a surface of fumed silica and nanosized oxides CeO _2/SiO_2, TiO_2/SiO_2, Al _2O_3/SiO_2

机译：TPD-MS研究香豆素及其杂环衍生物与气相二氧化硅和纳米级氧化物CeO _2 / SiO_2，TiO_2 / SiO_2，Al _2O_3 / SiO_2的相互作用

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摘要

The interactions between coumarins and the surface of fumed SiO _2, CeO_2/SiO_2, TiO_2/SiO_2 and Al_2O_3/SiO_2 were assessed by means of temperature-programed desorption mass spectrometry. The different stages of the thermolysis of coumarin were identified and an analysis of the underlying reactions was performed. The kinetic parameters of the involved reactions were thus obtained. The decomposition of thiazolyl-substituted coumarins was found to proceed through a 'thiazole-thiazine' ring expansion in the adsorbed state. A linear correlation between the sigma constants (Σσ) of the coumarin substituents and the activation energy of CO_2 formation was obtained.
机译：通过程序升温脱附质谱法对香豆素与气相二氧化硅_2，CeO_2 / SiO_2，TiO_2 / SiO_2和Al_2O_3 / SiO_2表面的相互作用进行了评价。确定了香豆素热分解的不同阶段，并对潜在的反应进行了分析。由此获得了所涉及反应的动力学参数。发现噻唑基取代的香豆素的分解通过吸附状态下的“噻唑-噻嗪”环扩展进行。获得了香豆素取代基的σ常数（Σσ）与CO_2形成的活化能之间的线性关系。

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