摘要
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.
Catalytic generation of hydrogen by partial oxidation of ethanol over a series of Ni Fe catalysts has been studied.The catalytic performances have been investigated over various O2/C2H5OH molar ratio at 473～573 K.These Ni Fe catalysts showed high performances for the partial oxidation of ethanol to hydrogen and Ni50Fe50 catalyst had the best activity when reaction temperature was between 548K and 573 K.The optimum reaction conditions for Ni50Fe50 catalyst are O2/C2H5OH =1.0、T=573 K.The fresh and used catalysts were characterized by XRD and XPS.The XRD patterns showed the main components of the active catalysts are the spinal type structure of magnetite and FeNi3 alloy(see Fig.4).The decrease in the selectivity for hydrogen of the catalyst may be resulted from the conversion of FeNi3 alloy phase in the catalyst during long term reaction(see Fig.5).XPS results confirmed that the phase of the bulk catalyst is mainly FeNi3 alloy and that of the surface catalyst is mainly magnetite (see Fig 6).
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2002年第5期426-431,共6页
Acta Physico-Chimica Sinica
基金
国家重点基础研究发展规划(G20000264)资助项目
