Precise adjustment of the electronic structure of heterogeneous
catalysts is an effective strategy to improve their catalytic properties.
By preparing Pd1Ba1/Al2O3 double atom catalysts with a ball milling method as a model catalyst,
we demonstrate an interfacial electronic effect of Pd species induced
by Ba single atoms (SAs) as electronic promoters. The introduction
of Ba SAs promotes the transfer of electrons from Ba atoms to Pd atoms,
forming electron-rich Pdδ+ species. During catalysis,
Pd species with the modification of Ba SAs lower apparent activation
energy and promote H2 dissociation, which dramatically
enhances the catalytic properties in several typical hydrogenation
reactions under mild conditions.
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