研究了Cu-Fe基催化剂上CO加氢反应过程中各组分尤其是铁的体相和表面微观结构的转化行为. 通过XRD、M(o)ssbauer谱、XPS和Raman光谱等表征手段全程跟踪铁形态的变化. 结果表明,还原后体相的铁发生了明显的碳化,物相以Fe3O4和χ-Fe5C2为主,随着反应温度的升高, χ-Fe5C2的含量出现最大值. 而还原后催化剂表面没有检测到明显的铁的碳化. 这种表面性质与体相的差异来源于铁独特的还原方式,这种还原方式造成锌和锰等组分在催化剂表面富集. 而在反应过程中,系统中还原/氧化气氛的变化导致铁组分在催化剂表面富集. 还原后自由碳原子在催化剂表面沉积,并随着反应的进行,碳原子的形态发生变化,显著抑制了Cu和Fe之间的协同作用,削弱了Cu-Fe基催化剂的链增长能力.
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