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研究了Ni-Fe催化剂对乙醇部分氧化制氢反应,系统地考察了不同O2/C2H5OH摩尔比及反应温度下催化剂的性能.发现Ni-Fe催化剂对乙醇部分氧化制氢具有较好的催化活性,其中组成为Ni50Fe50催化剂最好,最佳的反应条件是O2/C2H5OH=1.0,T=573K.XRD谱图表明催化剂主要由尖晶石结构的铁酸盐和FeNi3合金相组成.XPS结果说明,催化剂体相以还原态FeNi3合金相为主,表面以氧化态的铁酸盐为主.稳定性考察的结果表明,催化剂经40h反应后,对氢的选择性明显下降,此时对应的FeNi3物相衍射峰强度也明显降低,表明催化剂对H2选择性的下降与FeNi3物相的转变有关.
The partial oxidation of ethanol with hydrogen over Ni-Fe catalyst was studied, and the performance of the catalysts at different molar ratios of O2 / C2H5OH and reaction temperature were systematically investigated. It was found that Ni-Fe catalyst had good catalytic activity for the partial oxidation of ethanol to hydrogen, The optimum reaction conditions were O2 / C2H5OH = 1.0 and T = 573K.The XRD patterns showed that the catalyst mainly consisted of spinel ferrite and FeNi3 alloy.The XPS results showed that the catalyst The bulk phase is dominated by the reduced FeNi3 alloy and the ferrite is mainly oxidized on the surface.The results of the stability study show that the selectivity of hydrogen to the catalyst decreases obviously after 40h reaction and the corresponding FeNi3 phase The intensity of the diffraction peak was also significantly reduced, indicating that the decrease of selectivity of H2 to the catalyst was related to the transformation of the FeNi3 phase.