The suppression of methane and coke formation over Ni-based catalysts for low temperature ethanol steam reforming remains challenging. This paper describes the structural evolution of Fe-modified Ni/MgAl₂O₄ catalysts and the influence of iron species on methane and coke suppression for low temperature ethanol steam reforming. Ni–Fe alloy catalysts are gradually oxidized by water to generate Ni-rich alloy and γ-Fe₂O₃ species at steam-to-carbon ratio of 4. The electron transfer from iron to nickel within Ni–Fe alloy weakens the CO adsorption and effectively alleviates the CO/CO₂ methanation. The oxidation capacity of γ-Fe₂O₃ species promotes the transformation of ethoxy to acetate groups to avoid methane formation and the elimination of carbon deposits for anticoking. Ni10Fe10/MgAl₂O₄ shows a superior performance with a highest H₂ yield of 4.6 mol/mol ethanol at 400 °C for 15 h. This research could potentially provide instructions for the design of Ni-based catalysts for low-temperature ethanol steam reforming.

中文翻译：

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镍基催化剂中 Fe 种类在高效低温乙醇蒸汽重整中的作用

在用于低温乙醇蒸汽重整的镍基催化剂上抑制甲烷和焦炭的形成仍然具有挑战性。本文描述了 Fe 改性 Ni/MgAl ₂ O ₄催化剂的结构演变以及铁物质对低温乙醇蒸汽重整甲烷和焦炭抑制的影响。Ni-Fe 合金催化剂被水逐渐氧化，生成富 Ni 合金和 γ-Fe ₂ O ₃物种，蒸汽碳比为 4。Ni-Fe 合金中从铁到镍的电子转移减弱了 CO 吸附并有效缓解CO/CO ₂甲烷化。γ-Fe ₂ O ₃的氧化能力物种促进乙氧基向乙酸酯基团的转化，以避免形成甲烷和消除碳沉积物以防止结焦。Ni10Fe10/MgAl ₂ O ₄表现出优异的性能，在 400 °C 下 15 小时的最高 H ₂产率为 4.6 mol/mol 乙醇。该研究可能为设计用于低温乙醇蒸汽重整的镍基催化剂提供指导。