在前期开发的活性、稳定性、抗积碳性较好的甲烷化镍基催化剂基础上，选用不同粒径（0.45~1、1~2、2~3、3~4 mm）的商业γ-Al₂O₃载体，采用等体积浸渍法制备Ni-La/γ-Al₂O₃催化剂，并考察了其催化性能。通过物理吸附、EDS、TPR、XRD、TG等手段对催化剂进行了表征。结果表明，催化剂的活性随着粒径的增大没有很大差异，催化剂稳定性随着粒径的增大呈现规律性下降，这是由于随着粒径增大，积炭量增多，胶质碳C_β增多，导致催化剂失活。

On the basis of previously developed Ni-based catalysts with good activity,stability and anti-coking properties for methanation,Ni-La/γ-Al₂O₃ catalyst is prepared by incipient impregnation method and using commercial γ-Al₂O₃ with different pellet sizes (0.45-1,1-2,2-3,3-4 mm,respectively) as carrier,and its catalytic performances are determined.Then the catalyst is characterized by physical adsorption,EDS,TPR,XRD and TG.The results show that with the increasing of pellet size,the catalyst's activity does not differ greatly,but its stability decreases regularly.This is due to that with the increasing of pellet size,carbon deposition increases and gum C_β increases,which leads to deactivation of the catalyst.

何珍珍(1990-),硕士生,研究方向为甲烷化镍基催化剂的研究,hzz2111401085@163.com