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Recently, Dr. Sun Jian and Yu Jiafeng, team members of the Dalian Research Institute of Chemical Physics, Chinese Academy of Sciences, applied the Flame Spray Pyrolysis (FSP) to the metal oxides. The lattice oxygen locks in the metastable state, which greatly enhances the activity of the lattice oxygen, making the CO oxidation reaction rate 10 times higher than that of the conventional catalyst.
Redox cycles involving the participation of lattice oxygen in oxides are widely present in catalytic oxidation reactions. Among them, the lattice oxygen release rate is the speed control step of the reaction, therefore, the activity of the lattice oxygen is enhanced, thereby accelerating the oxidation-reduction cycle, and 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 at the same time weakening the metal-oxygen interactions in the oxides and making the lattice oxygen in the supersaturated metastable state. Oxygen vacancies are not found in freshly prepared Ce-Zr solid solution oxides, and metastable lattice oxygen can be stably present, but can be released under relatively mild conditions (such as low temperature reduction, vacuum treatment, supported metal, etc.). A large amount of active oxygen provides more active sites for CO oxidation. It was found that the oxides prepared by the FSP method can increase the number of oxygen vacancies by 19 times compared with the Ce-Zr oxides prepared by the co-precipitation method. The research results provide new ideas for the design and application of new oxide catalytic materials.
Related research results were published in the "Chemical Science". The study was funded by the Chinese Academy of Sciences-Helmholtz Partnership Research Team Project and the Chinese Academy of Sciences Youth Innovation Promotion Association.
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