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Ternary Ni-Al-Fe catalysts for ethanol steam reforming

机译:乙醇蒸汽改革的三元ni-al-FE催化剂

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Ternary mixed oxides prepared from takovite/reevesite Ni3Al_(1-x)Fe_x precursors were tested in ethanol steam reforming for hydrogen production. The influence of the trivaient cation (Al~(3+) or Fe~(3+)) on phase composition and derived catalytic performance of the resulting oxides was studied. The physico-chemical properties of the hydrotalcite-like precursors and related oxides were characterized by ICP, XRD, TGA-DSC, Raman, H2-TPR, and TEM analyses. Compared to pure binary systems (Ni3Al and Ni3Fe), the ternary systems showed the best performance in ethanol reforming, leading to high and stable hydrogen selectivity of up to ca. 70% in 100 h reaction tests. The increase in activity can be attributed to a cooperative effect between aluminum and iron, favoring ethanol dehydrogenation as the primary step, followed by acetaldehyde reforming and/or cracking, reverse water gas shift, and methanation, and concomitantly limiting the dehydration route to ethylene.
机译:由takovite/reevesite Ni3al_(1-X)Fe_x前体制备的三元混合氧化物在乙醇蒸汽重整中测试以进行氢的生产。 研究了生成氧化物的阳离子(Al〜(3+)或Fe〜(3+))的影响。 Hydrotalcite样前体和相关氧化物的物理化学特性通过ICP,XRD,TGA-DSC,Raman,H2-TPR和TEM分析表征。 与纯二元系统(NI3AL和NI3FE)相比,三元系统在乙醇改革中表现出最佳性能,从而导致高达Ca的高且稳定的氢选择性。 在100小时反应测试中70%。 活性的增加可以归因于铝和铁之间的合作作用,有利于乙醇脱氢作为主要步骤,其次是乙醛重整和/或开裂,反向水气体转移以及甲基化,并同时将脱水途径限制为乙烯。

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