Recently, Institute of Carbon Physics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Associate Professor of the Research Group for Carbon Nano-molecules and Hydrogen Energy Innovation and Special Zone Sun Jian, Yu Jiafeng's team used Flame Spray Pyrolysis (FSP) in the high-temperature quenching process to convert metal oxides into metal oxides. The lattice oxygen is locked in the metastable state, which greatly enhances the activity of the lattice oxygen, making the CO oxidation reaction rate 10 times faster than that of the conventional catalyst.
The oxidation-reduction cycle involving the lattice oxygen in the oxide is widely present in the catalytic oxidation reaction. The release rate of the lattice oxygen is a rapid-control step of the reaction. Therefore, the activity of the lattice oxygen is enhanced to accelerate the oxidation-reduction cycle. It is an important means to promote the catalytic oxidation reaction. The team used high-temperature quenching methods to ensure the stable formation of oxide crystals while weakening the metal-oxygen interactions in the oxides to make the lattice oxygen supersaturated. Steady state. Oxygen vacancies are not found in freshly prepared Ce-Zr solid solution oxides. Metastable lattice oxygen can be stably present under relatively mild conditions (eg, low temperature reduction, vacuum treatment, supported metals, etc.) A large amount of active oxygen can be released to provide more active sites for CO oxidation. It has been found that the amount of oxygen vacancies that can be provided by the oxides prepared by the FSP method is higher than that of Ce-Zr oxides prepared by the co-precipitation method. 19 times. The research results provide new ideas for the design and application of new oxide catalytic materials.
The relevant research results were published in the "Chemical Science". This research was supported by the Chinese Academy of Sciences-Helmholtz Partner Research Team Project and the Chinese Academy of Sciences Youth Innovation Promotion Association.
