Abstract

Co₂Al layered double hydroxide (Co₂Al–LDH) could efficiently catalyze the aerobic epoxidation of olefin in the presence of isobutaldehyde (IBA). Various alkenes could transformed to its corresponding epoxide under the catalytic system and the catalyst showed exceptional reusability under the selected reaction conditions. The relationship between catalytic performance and Co₂Al–LDH has been studied in the present research. The surface basicity of hydrotalcite was found to be beneficial to the reaction. Based on the controlled results and kinetic study, it was found that basicity not only accelerate the reaction rate, but also benefit the selectivity of epoxide. A possible mechanism of the reaction was proposed based on the controlled results and analysis, which was assumed that the epoxides were generated through two paths involving acylperoxy radical and peroxyacid.

Graphic abstract

中文翻译：

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双功能Co 2 Al层状双氢氧化物促进烯烃的有效好氧环氧化

摘要

Co ₂ Al层状双氢氧化物（Co ₂ Al–LDH）在异丁醛（IBA）存在下可以有效催化烯烃的好氧环氧化。各种烯烃可以在催化体系下转化为相应的环氧化物，并且在选定的反应条件下，该催化剂表现出出色的可重复使用性。催化性能与Co ₂的关系在本研究中已经研究了Al-LDH。发现水滑石的表面碱性对反应有利。根据控制结果和动力学研究，发现碱度不仅加快了反应速度，而且有利于环氧化物的选择性。根据控制结果和分析结果，提出了一种可能的反应机理，认为环氧化物是通过酰基过氧自由基和过氧酸两种途径生成的。

图形摘要