考察了5%Fe/TiO2催化剂在CO2加氢制低碳烃中的催化活性. 最佳结果显示,CO2转化率为19.1%,C2+烃选择性为50.1%. 用X射线粉末衍射、激光拉曼光谱、穆斯堡尔谱及F e K-吸收边扩展X射线吸收精细结构等研究了该催化剂在还原条件下的体相及表面结构. 结果表明,在Fe/TiO2中,主要存在超顺磁的Fe0,α-Fe,配位不饱和的Fe2+物种及体相FeTiO3. 还原温度对Fe/TiO2催化剂的体相和表面结构及催化性能有显著的影响. 高温还原会破坏催化剂的表面结构,导致催化活性显著下降. 将催化活性与体相及表面结构相关联,提出Fe0与配位不饱和的Fe2+物种之间的协同作用是催化剂显示较高活性的重要原因.
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