CH_4、CO_2、O_2制合成气用Ni-Ce/Al_2O_3催化剂的XPS研究  

XPS Study on Ni-Ce/Al_2O_3 Catalyst for Catalytic Reforming into Syngas by Methane, Carbon Dioxide and Oxygen

作　　者：宋一兵[1] 陈德平 林维明[3] 

机构地区：[1]汕头大学化学系,广东省汕头市515063 [2]汕头检验检疫局,广东省汕头市515041 [3]华南理工大学,广州市510641

出　　处：《光谱实验室》2003年第3期459-462,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：汕头大学工业催化学科"2 11工程"建设项目资助

摘　　要：用 XPS表征浸渍法制备的 Ni- Ce/ Al2 O3催化剂 ,并与活性评价结果相关联 ,研究了添加 Ce对催化剂性能的影响 ,探讨了催化剂失活的原因。结果表明 ,稀土 Ce在反应过程中存在着部分还原变价过程( Ce4 ++e→ Ce3+) ,Ce3+能够迁移至 Al2 O3晶格 ,增强载体 Al2 O3的抗烧结能力 ,提高催化剂的稳定性 ;Ni-Ce/ Al2 O3催化剂表面的 Ni和 Ce在反应过程中向体相迁移 ,以及The catalytic activity of Ni/Al 2O 3 and Ni-Ce/Al 2O 3 for reforming into syngas of methane,carbon dioxide and oxygen was investigated in a fixed bed continuous-flow quartz reactor by using XPS.The Ni-Ce/Al 2O 3 catalyst exhibits higher reactive stability than Ni/Al 2O 3.XPS measurement suggested that during the pretreatment and reaction,the reduction of Ce 4+ to Ce 3+ can improve the thermal stability of Ni-Ce/Al 2O 3 in the presence of vapor,and prolong the life time.On the other hand,Ni and Ce located on the surface of Ni-Ce/Al 2O 3 catalyst gradually migrates into the body phase during the reaction,and results in the decrease of the surface concentration of Ni and Ce.The loss and sintering of Ni at higher temperature on the surface of Ni-Ce/Al 2O 3 are responsible for the decrease of the catalyst activity. [WT10.5,10.HZ]

关 键 词：甲烷 合成气 催化剂 X射线光电子能谱 氧化铝负载镍铈催化剂 

分 类 号：TE665.3[石油与天然气工程—油气加工工程] O643.36[理学—物理化学]