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用TG-DTA-DSC热分析仪研究了Cu-Co-Fe系催化剂在程序升温还原过程中的中间态变化及其动力学。发现催化剂的还原是分阶段进行的,第一段主要是Cu,Co组分的还原,第二段为Fe组分的还原。由于组分间的交互作用,铁组分的还原容易进行。Co组分的还原经历了Co_3O_4→CoO→Co的过程;Cu组分是CuO先还原成Cu_2O,然后还原为Cu。用Coats-Redfern法对实验数据作动力学处理,其结果与用Broido法处理的相一致。表明此法可用于多相还原过程,得到还原动力学的有关参数。
The change of intermediate state and its kinetics of Cu-Co-Fe catalyst during temperature-programmed reduction were investigated by TG-DTA-DSC thermal analysis. It is found that the reduction of the catalyst is carried out in stages. The first stage is mainly the reduction of Cu and Co components and the second stage is the reduction of Fe components. Due to the interaction between the components, the reduction of the iron component is easy. The reduction of Co undergoes the process of Co_3O_4 → CoO → Co; the Cu is first reduced to Cu_2O by CuO and then reduced to Cu. The experimental data were subjected to kinetic treatment using the Coats-Redfern method and the results were consistent with the Broido method. The results show that this method can be applied to the multi-phase reduction process and obtain the relevant parameters of the reduction kinetics.