Investigation of iron oxide reduction by ethanol as a potential route to produce hydrogen

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• 作者：M.G. Rosmaninho^a ; F.C.C. Moura^a ; L.R. Souza^a ; R.K. Nogueira^a ; G.M. Gomes^a ; J.S. Nascimento^a ; M.C. Pereira^a ; J.D. Fabris^a ; J.D. Ardisson^b ; M.S. Nazzarro^c ; K. Sapag^c ; M.H. Araú ; jo^a ; R.M. Lago^a ; ^{rochel@ufmg.br}
• 关键词：Hydrogen production ; Hydrogen storage ; Ethanol ; Iron oxide
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：5 April, 2012
• 卷：115-116
• 期：Complete
• 页码：45-52
• 文件大小：1214 K

摘要

In this work, a novel way to indirectly store and produce H₂ from ethanol was investigated using a two-step process based on the reduction of iron oxide followed by oxidation with H₂O. The reduction of different iron oxides, i.e., Fe₂O₃, Fe₃O₄ and FeOOH, with ethanol to produce Fe^o was investigated. TPRe (Temperature Programmed Reactions) and M枚ssbauer and XRD analyses showed that ethanol reduces Fe₂O₃ sequentially to Fe₃O₄ at 350-500 掳C, to Fe₃O₄/FeO at 500-600 掳C and finally to Fe^o at 700 掳C. The formed Fe^o can then be oxidized by H₂O to produce H₂ and Fe₃O₄, as shown by M枚ssbauer and XRD analyses. Cyclic experiments showed that iron could be consecutively reduced/oxidized at least 5 times without any significant decrease in H₂ production after the second cycle. However, reactions of Fe₂O₃ with ethanol at higher temperatures, i.e., 800 and 900 掳C, led to the formation of iron carbide and significant carbon deposition. XPS, SEM, TEM, Raman and TG showed 24-28 wt%carbon content, particularly on the surface as nanofibers and as amorphous and graphitic carbon.