低碳混合醇铜基催化剂中稀土助剂的作用

The effect of rare earth promoter in Cu-base catalysts for lower alcohols

研究了La、Ce稀土助剂对低碳混合醇铜基催化剂结构和性能的影响。含有La或Ce的催化剂各组分分散均匀,铜晶不易烧结长大,加之表面存在传热性好的网络结构,热稳定性增强。同时稀土助剂的加入抑制了K(钾)的副作用,并使K在表面上富集,提高了高碳醇的选择性。

The effect of rare earth promoter on the struc- ture and properties of Cu-base catalysts for lower alcohols synthesis has been studied. It has been found that the rare earth promoter (La_2O_3 or Ce_2O_2)can enhance dispersion of Cu crystallite and a network structure is formed, The catalysts possess a larger Cu surface area and better thermal stability. In the presence of rare earth promoter, K is localized on the surface of the catalysts and therefore the selectivivty of higher alcohols is raised. The role of La and Ce has also been explained in the article.