Application Of In Situ NMR Of Catalytic Mechanism And Atmosphere Influence On Photocatalytic Reaction

Studying the mechanism of photocatalytic reaction plays an important role to the improvement of the photocatalytic properties and the development of catalytic systems.The NMR method can be used in the study of in situ micro-reaction mechanism because it can quantitatively detect the intermediate products containing hydrogen and carbon without separating the products.In this paper,the photocatalytic reaction mechanism of methanol was studied by in situ NMR technology,including the reaction environment?atmospheric pressure,gas volume,etc.?and the influence mechanism of noble metal co-catalyst on the photocatalytic reaction process of methanol.The specific results are as follows:1?The photocatalytic process was studied by in situ NMR.The effects of reaction atmosphere pressure and gas amount on methanol reforming were studied.It was found that the reaction atmosphere inhibited the formation of products,and the degree of inhibition was related to the type of gas.The ambient pressure and gas amount have no significant effect on the inhibition of methanol photocatalytic reforming reaction.These results show that both chemical and physical adsorption exist on the surface of TiO₂.The competitive adsorption between the gas and the methanol molecule can inhibit the products.This result further deepened the understanding of the reaction mechanism.2?The mechanism of methanol reforming by pure/supported anatase TiO₂ catalyst was studied by in situ NMR and gas molecular probe.It was found that the loading of noble metals not only changed the efficiency of methanol reforming reaction,but also changed its reaction position on the catalyst.In addition,SMSI?strong metal-support interaction?effects of different precious metals have different effects on reaction.