燃料化学学报2021，Vol.49Issue(2)：186-197,12.DOI:10.1016/S1872-5813(21)60012-9
La-Ni/Al2O3-ZrO2催化剂中钙钛矿型LaNiO3的形成及其CO甲烷化性能
Formation of perovskite-type LaNiO3 on La-Ni/Al2O3-ZrO2 catalysts and their performance for CO methanation
摘要
Abstract
The carbon deposition and sintering of Ni-based catalysts, used in CO methanation, are the main problems to be solved. In this paper, supported LaNiO3/Al2O3-ZrO2 catalyst was prepared by neutralization hydrolysis-citric acid complexation method. The effects of La-Ni loading and calcination temperature of support on the structure and catalytic activity of the catalyst were investigated. The structural evolution of catalyst precursor before and after reduction was studied via XRD, H2-TPR, BET, XPS, TEM and other characterization methods. The results showed that the catalyst supported by homogeneous Al-Zr solid solution was beneficial to form the active component with LaNiO3 structure, and the Ni0 derived from LaNiO3 was the key factor for keeping the activity at high temperature. The La-Ni loading affected the formation of LaNiO3 and the reduction state of Ni. Among the catalysts studied, 30％ of the La-Ni loading was more favorable for the formation of perovskite LaNiO3. The Ni0 and La2O3 reduced from LaNiO3 were highly dispersed on the surface of the support, and the Ni0 nanoparticles were anchored by the support and La2O3, which inhibited the migration and aggregation of Ni0 particles at high temperature and thus led to high thermal stability.关键词
CO甲烷化/铝锆复合氧化物/钙钛矿/镍/氧化镧Key words
CO methanation/aluminum zirconium composite oxide/perovskite/nickel/lanthanum oxide分类
化学化工引用本文复制引用
王宏伟,吴俊霞,王晓燕,王红,刘进荣..La-Ni/Al2O3-ZrO2催化剂中钙钛矿型LaNiO3的形成及其CO甲烷化性能[J].燃料化学学报,2021,49(2):186-197,12.基金项目
The project was supported by the National Natural Science Foundation of China (21962014) and Natural Science Foundation of Inner Mongolia (2016MS0219). （21962014）
