The Reaction Mechanism Studies On Photocatalytic Methanol Reforming In Liquid Environment By Operando NMR Technique

In this work,we use operando nuclear magnetic resonance?NMR?method to investigate the role of bulk water?H₂O?in methanol photocatalytic reforming processes in liquid environment.Further,we probe into the impact of different co-catalysts and wavelength of light on methanol photocatalytic reforming products.The main results are shown below.1.In real liquid environment,bulk water not only can affect the types of methanol reforming products,but also its participation way can vary from H₂O molecule to H-atom.Furthermore,the productivities of the main products-methylene glycol?HOCH₂OH?and hemiacetal?CH₃OCH₂OH?-show different dependency on the H₂O concentration.The possible mechanism studies of reforming products are studied by combining operando NMR and the DFT calculation methods.2.Co-catalysts?anatase TiO₂ modified with different isolated noble metal atoms?have influences on yields of reforming products to some extents,while they have little impact on the kinetics of reforming products.Moreover,the wavelength of light make a difference on yields.By comparison,it shows that co-catalysts play an important role on the redox capacity and the synergistic effect between the rate of methanol oxidation products and hydrogen production of the photocatalysis reaction.