MoO_3对Ni-La/r-Al_2O_3催化剂上CO和CO_2甲烷化性能的影响

The Effect of MoO 3 on Methanation of CO and CO 2 over Ni-La/r-Al 2O 3 Catalyst

用浸渍法制备了一系列的镍基甲烷化催化剂，测定了其ＣＯ和ＣＯ２的甲烷化活性实验结果表明，ＭｏＯ３的加入能增加Ｎｉ－Ｌａ／ｒ－Ａｌ２Ｏ３催化剂的活性用ＴＥＭ，ＸＰＳ及ＴＰＲ等手段对催化剂的表面性质进行了研究，发现ＭｏＯ３的加入能提高催化剂表面镍原子浓度，增加催化剂中镍的分散度。

A series of Ni-based methanation catalysts are prepared by impregnation.The activities of catalysts for CO and CO 2 methanation are investigated.The experimental results show that the addition of MoO 3 makes the activity of Ni-La/r-Al 2O 3 catalyst higher.The surface behaviours of the catalysts are studied by TEM,XPS and TPR.It has shown that the MoO 3 can increase the concentration of nickel atoms on the surface of Ni-La/r-Al 2O 3,make the crystalline granule of nickel smaller,affect the electronic structure of nickel and make the reduction temperature of Ni lower.All these actions will improve the catalytic activity.