添加稀土氧化物对甲烷化催化剂中镍分散度的影响

Study on Dispersion of Ni in Methanation Catalyst by Rare Earth Oxide Additives

本文对稀土氧化物的助剂作用做了进一步研究，对添加１４种稀土氧化物的催化剂进行了活性表面积、ＣＯ吸附ＩＲ谱、表观活化能的测定及ＡＥＳ表面微区分析。结果表明，添加稀土氧化物助剂，提高了镍的分散度，使镍更富集于表面，增加了反应的活性中心数目，反应活化能没有降低，具有结构效应，但不同稀土元素的作用不同。这可能与稀土元素本身的性质有关。

In this work,we have made an investigation on promoter effects of the rare earth oxides in Ni/γ-Al 2O 3.The results show that RE oxide promotors can increase the dispersion of Ni atoms and the quantity of methanation activity center,and enable Ni atoms to concentrate on the catalyst surface.It has been found that the promoter effect varies as function of the kind of the rare earth oxide,this is possibly related to the fundamental properties of the rare earth oxide concerned.