Construction of mesoporous ceria-supported gold catalysts with rich oxygen vacancies for efficient CO oxidation

• 作者: Xin Shen Wang Li Shunmin Ding Xiaohua Ma Shaohua Wu Weiming Xiao Rong Zeng Sanguo Hong Chao Chen
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: RARE EARTH CATALYSIS
• 页码范围: 434-442
• 页数: 9页
• 语种: 英文

摘要

Bearing unique redox nature and high oxygen storage capacity,ceria (CeO2) has always been a promising CO oxidation catalyst support for gold (Au) catalysts and the like.Herein,a series of Au-CeO2-P (P stands for pH value) samples was prepared by a co-precipitation method with the assistance of an alkaline environment and amino groups functionalized ordered mesoporous polymer (OMP-NH2).Afterward,all samples described above were characterized that the Au-CeO2-P catalysts are made of Au-Ce-O solid solution and Au nanoparticles (NPs) supported on CeO2.It turns out that OMP-NH2 is not just a simple sacrificial template for mesoporous structure,but also plays an important role as an amino source,explaining the presence of rich oxygen vacancies.Due to the concentration of oxygen vacancies in Au-Ce-O solid solution is the key factor for the oxygen mobility of CO oxidation,the catalytic results also demonstrate that the catalytic activity of Au-CeO2-P catalysts is related to the concentration of their oxygen vacancies.Moreover,Au-CeO2-9.6 with a highest concentration of oxygen vacancies (as high as 13.98％) in Au-CeO2-P catalysts exhibits the best catalytic activity (complete conversion at 10 ℃).