【Frontiers in HaiChuan Chemical Technology】Research from Dalian Institute of Chemical Physics reveals the mechanism of catalyst-support interaction

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Recently, Bao Xinhe, an academician of the Chinese Academy of Sciences and a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, along with the team led by Fu Qiang from the same institute, made new progress in the study of interfacial interactions between oxides and between metals and oxides. They found that when the oxide support has a strong interaction with the oxide catalyst, its interaction with the metal catalyst is relatively weak, and vice versa. The relevant findings were published in the Journal of the American Chemical Society. Metal oxides are widely used in the chemical and energy industries as catalytically active components and carriers. In earlier research, the team discovered that single-layer dispersed, metastable, highly active oxide nanostructures are stable on noble metal surfaces, and based on this they proposed the concept of interface-confined catalysis. Furthermore, recent research by this team has further revealed the interfacial confinement effect between oxides. Researchers found that the strong interaction between platinum and the ceria dioxide carrier can effectively suppress platinum sintering, resulting in good catalytic activity in the carbon dioxide hydrogenation reaction ； The weak interaction between platinum and silica causes the sintering and deactivation of those bearing Pt nanoparticles. In contrast, cerium dioxide-supported cobalt oxide tends to be reduced to metallic Co0 or oxidized to Co3+, showing weaker interfacial interactions ； The strong interfacial interaction between cobalt oxide and silica helps to stabilize the low-valent Co2+ ions in hydrogen and oxygen atmospheres. The team revealed that the strength of the interaction between the metal and the support, as well as between the oxide and the support, is directly related to the reducing ability of the support. They introduced the concept of \"gold affinity and oxide affinity of oxide supports\" and also uncovered the mechanism of interaction between the catalyst and the oxide support.