Metal-Support Interaction in Pd-based MoOx Catalysts and Its Influence on Heck Reaction
Palladium(Pd)catalyzed Heck reaction is one of the effective methods for constructing carbon carbon bonds in synthesis.Metal-support interaction(MSI)is of great significance for significantly improving or reducing catalytic performance of heterogeneous catalysts in certain industrial processes due to exposure or blockage of metal active sites.This article synthesized Pd based MoOx catalysts and studied the performance of metal-support interaction(MSI)between palladium nanoparticles and molybdenum oxide layer in the Heck reaction of iodobenzene and methyl acrylate under different redox treatment conditions using XRD,XPS,Raman and other characterization methods.Research has found that partial reduction of Pd/MoO3 under hydrogen conditions leads to the migration of MoOx species to the surface of Pd NPs and the formation of encapsulation structures.The coating may be re exposed through air calcination,and MSI leads to a decrease in the catalytic performance of Pd/MoO3 in the Heck reaction.This study demonstrates the importance of balanced metal support interactions in actual catalyst design to achieve higher utilization of precious metal catalysts in catalytic Heck reactions.
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