Ru-Co/SiO_2催化剂的TPR还原动力学  

THE TPR REDUCTION DYNAMICS OF Ru-Co/SiO_2 CATALYST

作　　者：高海燕[1,2] 相宏伟[2] 李永旺[2] 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122 [2]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《石油学报（石油加工）》2010年第2期231-234,共4页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(20590361)资助

摘　　要：采用TPR法研究了Co3O4粉末、Co/SiO2催化剂、Ru-Co/SiO2催化剂的还原动力学,求出了这几种物质的还原活化能。结果表明,这几种物质的还原过程均分2步进行,即Co3O4→CoO→Co。3种样品中,Co3O4→CoO的还原活化能均高于CoO→Co的还原活化能。Co/Si O2催化剂中,对应于Co3O4→CoO及CoO→Co的还原活化能均大于Co3O4粉末,其中第1步的活化能增加较多,而第2步次之,表明Co物种与Si O2载体存在着相互作用力;在每个升温速率下的初始还原温度均降低,表明负载后的催化剂提高了氢气的扩散能力。Ru-Co/SiO2催化剂还原过程与Co3O4粉末相比,Co3O4→CoO的还原活化能增大,而CoO→Co的还原活化能降低,初始还原温度进一步降低,表明Ru助剂的加入改变了Co/SiO2催化剂的还原历程。reduction dynamics of Co3O4, Co/SiO2 and Ru-Co/SiO2 catalysts were investigated to get their reductive activation energies by TPR method. For these three substances, the reduction proceeded through two stages, and reductive activation energies for Co3O4→CoO were all higher than that for CoO→Co. For both the reduction processes of Co3O4→CoO and CoO→Co, the corresponding reductive activation energies of Co/SiO2 catalysts were larger than that of Co3O4 powder, of which the activation energy of first step Co3O4→CoO gained a larger increase, while that of the second step CoO→Co followed. In contrast, the activation energy corresponding to reduction process Co3O4→CoO of Ru-Co/SiO2 catalyst was larger than that of Co3O4 powder, while the activation energy corresponding to reduction process CoO→Co f Ru-Co/SiO2 catalyst was smaller than that of Co3O4 powder, the results indicated that the addition of Ru changed the reduction course of Co/SiO2 catalyst.

关 键 词：TPR 还原动力学 Co3O4粉末 Co/SiO2催化剂 Ru-Co/SiO2催化剂 

分 类 号：TQ139.2[化学工程—无机化工]