稀土氧化物（REO_x）对Ni／SiO_2甲烷化活性影响  

The effect of rare earth oxide to the methanation of Ni/SiO_2

作　　者：姚百盛[1] 马春琪[1] 李琬 

机构地区：[1]北京师范大学化学系,北京工业大学环境工程系

出　　处：《高校化学工程学报》1994年第S1期127-129,共3页Journal of Chemical Engineering of Chinese Universities

摘　　要：实验发现稀土氧化物（Ｐｒ_６Ｏ_（１１）、Ｎｄ_２Ｏ_３、Ｓｍ_２Ｏ_３）能增加Ｎｉ／ＳｉＯ_２催化剂甲烷化性能。通过程序升温还原（ＴＰＲ）、Ｘ－粉末衍射（ＸＲＤ）、扫描电镜（ＳＥＭ）等实验手段对催化剂结构、物理化学性质、载体－助剂－金属三者间的相互作用进行了研究，发现ＲＥ^（３＋）与硅胶表面Ｓｉ－ＯＨ基反应，减少了镍与硅胶间的相互作用，使ＮｉＯ晶粒变小。It`s found that rare earth oxide (ReO_x)can promote the methanation reaction of Ni / SiO_2.The structure and the chemical and physcal properties of Ni-RE /SiO_2 are studied through TPR、XRD and SEM experiments. The interactions of carrier(SiO_2)、catalytic aid(REOx)and metal (Ni)are also researched.The experimental results indicate that the interplays of Ni and SiO_2 are lessened by the reaction of RE￣(3+) and Si-OH on the surface of SiO_2.The reaction also decreases the sizes of Ni and NiO crystal particles.

关 键 词：稀土氧化物 甲烷化 程序升温还原 X-粉末衍射 扫描电镜. 

分 类 号：O643.3[理学—物理化学]