Pseudo core-shell LaCoO3@MgO perovskite oxides for high performance methane catalytic oxidation

• 作者: Saifei Wang Jie Liu Yiyuan Zhang Peiqi Chu Haobin Liu Man Wang Erhong Duan
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: RARE EARTH CATALYSIS
• 页码范围: 51-57
• 页数: 7页
• 语种: 英文

摘要

Magnesia modified LaCoO3 was prepared by a facile one-step sol-gel method and used for removal of dilute methane.Compared with the conventional doping technique,the obtained LaCoO3@MgO-x exhibits pseudo core-shell structure and shows superior catalytic activity.The methane conversion exceeds 90％ at 532 ℃ on LaCoO3@MgO-0.1,while only 60％ of methane is conversed using the doped perovskite LaCoo.9Mgo.1O3.The high catalytic performance of LaCoO3@MgO-0.1 is mainly attributed to the adjustment of surface acid-base properties by the MgO shell structure.According to density functional theory (DFT) calculation,the methane is more likely to be adsorbed and cracked on [e-mail] in situ DRIFTS shows that CH3-O-CH3 intermediate specie is formed.The pseudo core-shell structure also enhances the stability and the LaCoOs@MgO-0.1 maintains high activity after working for 100 h.The above results demonstrate that surface modification by magnesia is an effective strategy for improving LaCoO3 catalytic performance.