Development And Application Of The Strong Metal-support Interaction In Precious Metal Catalysts

The occurrence of strong metal-support interaction?SMSI?will seriously affect the physicochemical properties of the catalyst,and then it will significantly affect or even change the catalytic properties of the catalyst.Therefore,any new understanding or discovery about the SMSI effect is of great significance not only for SMSI,but also for supported catalyst systems,and may trigger innovation in catalyst preparation or development.For the first time,the SMSI constructed by the hydrolysis of NaBH₄ between Au and TiO₂ was reported.This SMSI effect differs from the classic SMSI in that its metal nanoparticles indicate that the nakedness is not encapsulated by the carrier,which is a SMSI effect dominated by the electronic effect.Further research found that this special SMSI effect is universal:its catalyst system can be extended to other TiO₂-supported catalysts,such as Pt/TiO₂ catalyst systems;its induction conditions can be further extended to other means that can provide proton hydrogen,such as hydrazine hydrate decomposition.This kind of catalyst system under the action of electron-induced SMSI has a higher catalysis for the catalytic hydrogenation of nitrobenzene than the catalyst under the action of classic SMSI due to the modification of the electronic properties of its metal species and its exposed active site active.The research findings provided a new idea for the design and construction of a new type of SMSI,and the construction of the SMSI effect of a supported metal catalyst system was achieved under mild conditions.The classic SMSI effect between gold nanoparticles and zirconium dioxide?ZrO₂?was discovered and verified for the first time.Under the action of the classic SMSI,the chemisorption capacity of Au/ZrO₂ catalyst on CO was significantly inhibited,accompanied by the carrier's coating on the metal and the electron transfer behavior between the carrier and the metal.The above characteristics were approximately identical to the classic SMSI effect characteristics of the Pt catalyst system supported by TiO₂.This study not only overturned the traditional cognition that the metal catalyst supported by ZrO₂ could not produce classical SMSI effect,but also improved the classical SMSI of Au catalyst system,which further deepened our understanding and cognition of SMSI effect.