Progress on the application of solid state nuclear magnetic resonance in aluminum fluoride catalysts
As an important fine chemical intermediate,the preparation of hydrofluoroolefins(HFOs)is really related to the response of global warming and optimizing energy structure.Aluminum fluorides with high specific surface area are core catalysts for HFOs production owing to their advantages of environmen-tally friendly,hydrogen fluoride tolerance and rich acid sites.However,the pursuit of high specific surface area also brings challenges to the study of its physicochemical properties.Solid state nuclear magnetic res-onance(ssNMR)is a powerful tool to elucidate the structure,interpret the synthesis mechanism and iden-tify acid sites of the aluminum fluorides.In this review,the major progresses in structure identification,synthesis mechanism elucidation and acid sites recognition and quantification of aluminum fluorides with high specific surface area utilizing advanced multi-dimensional and-nuclear ssNMR,including 27Al,19F,1H and 13C,were summarize.The physicochemical properties of aluminum fluoride catalysts were systemati-cally analyzed.These will provide theoretical guidance for the optimization of aluminum fluoride catalysts with excellent properties.
catalyst engineeringsynthesis of HFOsaluminum fluoride catalystsssNMRstructuresyn-thesis mechanismacid sites
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