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首页> 外文期刊>Catalysis science & technology >Selective cyclohexene oxidation with O-2, H(2)O(2)andtert-butyl hydroperoxide over spray-flame synthesized LaCo(1-x)Fe(x)O(3)nanoparticles
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Selective cyclohexene oxidation with O-2, H(2)O(2)andtert-butyl hydroperoxide over spray-flame synthesized LaCo(1-x)Fe(x)O(3)nanoparticles

机译：选择性与0 2环己烯氧化,H (2) O (2) andtert-butyl氢过氧化物spray-flame合成LaCo(最大值O (3) nanoparticles) Fe (x)

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摘要

The elimination of waste and by-product generation and reduced dependence on hazardous chemicals are the key steps towards environmentally sustainable chemical transformations. Heterogeneously catalysed oxidation of cyclohexene with environmentally friendly oxidizing agents such as O-2, H(2)O(2)andtert-butyl hydroperoxide (TBHP) has great potential to replace existing processes using stoichiometric oxidants. A series of spray-flame synthesised nanoparticulate LaCo(1-x)Fe(x)O(3)catalysts was employed for cyclohexene oxidation, and the comparative results showed that TBHP led to the highest initial activity and allylic selectivity, but O(2)resulted in higher conversion for longer reaction times. Furthermore, the influence of Fe substitution was studied, which did not show any beneficial synergistic effects. LaCoO(3)was found to be the optimum catalyst for cyclohexene oxidation with O-2, following first-order reaction kinetics with an apparent activation energy of 57 kJ mol(-1). The catalyst showed good reusability due to its highly stable particle size, morphology and perovskite structure. 7-Oxabicyclo[4.1.0]heptan-2-one was identified to be formed by the oxidation of 2-cyclohexene-1-one with 2-cyclohexene-1-hydroperoxide.
机译：消除浪费和副产品的一代和减少有害化学物质的依赖对环境可持续的关键步骤化学转换。催化氧化环己烯环保型氧化剂等0 2 H (2) O (2) andtert-butyl氢过氧化物(TBHP)很有可能取代现有流程使用化学计量氧化剂。spray-flame合成nanoparticulateLaCo (1 - x)铁(x) O(3)催化剂被用于环己烯氧化和比较结果表明,TBHP导致最高最初的活动和烯丙基的选择性,但是O(2)导致更高的转换时间反应时间。没有任何替代研究有益的协同效应。环己烯的最佳催化剂氧化与0 2、一阶反应动力学明显激活的能量57 kJ摩尔(1)。可重用性由于其高度稳定的粒子大小、形态和钙钛矿结构。7-Oxabicyclo 4.1.0 heptan-2-one被确定是由2-cyclohexene-1-one的氧化2-cyclohexene-1-hydroperoxide。

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