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Role of the Fe oxidation states on the catalytic oxy-dehydrogenation of ethylbenzene using CO2 as a soft oxidant over FeOX/carbon-alumina

机译:Fe氧化状态对Feox /碳 - 氧化铝柔软氧化剂使用CO2作为乙苯催化氧脱氢的作用

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摘要

Iron oxide (FeOx) supported on 1:3 carbon-alumina (ICA) was prepared by wet impregnation method. Oxidized and reduced forms of Fe in ICA catalyst were achieved by diluted H2O2 and hydrazine hydrate treatments, respectively. Three different oxidation states of Fe present in magnetite (Fe2+ and Fe3+), hematite (Fe3+) and wustite (Fe2+) were confirmed by XPS, powder-XRD, H-2-TPR, TGA, NH3-TPD and N-2-physisorption analysis. Among the synthesized catalysts, in comparison with hematite and wustite phases, magnetite phase offered high catalytic activity in ethylbenzene dehydrogenation reaction. The presence of CO2 in the reaction mixture was found to leave intact the activated carbon support structure.
机译:通过湿浸渍方法制备1:3碳 - 氧化铝(ICA)的氧化铁(Feox)。 通过稀释的H 2 O 2和肼水合物处理,实现了ICA催化剂中的氧化和减少的Fe形式。 通过XPS,粉末-XRD,H-2-TPR,TGA,NH3-TPD和N-2物理学证实了三种不同氧化剂的Fe的Fe氧化态(Fe2 +)和Wustite(Fe2 +)。 分析。 在合成的催化剂中,与赤铁矿和硅酸盐相比,磁铁矿相对于乙苯脱氢反应提供高催化活性。 发现CO 2在反应混合物中存在完整的活性炭载体结构。

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