氧化铁系脱氢催化剂的催化活性本质

The Nature of the Iron Oxide-Based Catalyst for Dehydrogenation

通过分析表面钾含量和催化活性的关系及钾助催剂与氧化铁的相互作用认为，在现有的各种有关氧化铁系脱氢催化剂活性模型中，实验结果只和ＫＦｅＯ＿２活性相模型相符。活化态催化剂似可描述为ＫＦｅＯ＿２／储钾相／晶格氧供体／Ｆｅ＿３Ｏ４多相动态体系。其中，ＫＦｅＯ＿２是活性相，晶格氧供体既可为助催剂，也可是Ｆｅ＿３Ｏ＿４。

It was shown by investigating the interaction between potassium promotor andiron oxide, and the relationship between catalytic activity and potassium amount carried on the surfaceof a model catalyst that KFeO_2 model was the only one which agreed with our experiment results in allthe three current active modeis of irpn oxide based catalyst for dehydrogenation. The nature of thiscatalyst was suggested as a KFeO_2/donor of lattice oxygen/storage phase for potassium/Fe_3O_4 system,in which KFeO_2 was the active phase and the donor of lattice oxygen could be some promotors and/orFe_3O_4.