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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
Catalysis Communications ( IF 3.7 ) Pub Date : 2018-09-11 , DOI: 10.1016/j.catcom.2018.09.001
Venkata Ramesh Babu Gurram , Siva Sankar Enumula , Kumara Swamy Koppadi , Raji Reddy Chada , David Raju Burri , Seetha Rama Rao Kamaraju

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 wüstite (Fe2+) were confirmed by XPS, powder-XRD, H2-TPR, TGA, NH3-TPD and N2-physisorption analysis. Among the synthesized catalysts, in comparison with hematite and wüstite 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.



中文翻译:

Fe的氧化态对CO 2作为FeO x /碳-氧化铝上的软氧化剂的乙苯催化氧化脱氢的作用

通过湿法浸渍法制备了负载在1:3的碳-氧化铝(ICA)上的氧化铁(FeO x)。分别通过稀释的H 2 O 2和水合肼处理可实现ICA催化剂中Fe的氧化和还原形式。XPS,粉末-XRD,H 2 -TPR,TGA,NH 3证实了磁铁矿(Fe 2+和Fe 3+),赤铁矿(Fe 3+)和锰铁矿(Fe 2+)中三种Fe的氧化态。-TPD和N 2-物理吸附分析。在合成的催化剂中,与赤铁矿和镁橄榄石相相比,磁铁矿相在乙苯脱氢反应中具有较高的催化活性。发现反应混合物中CO 2的存在保留了完整的活性炭载体结构。

更新日期:2018-09-11
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