The support is pivotal for stabilizing single metal atom and contributes to enhance the catalytic activity of single-atom catalysts (SACs). With the merits of versatile structures, tailored electronic structure, as well as high stability, manganese oxide octahedral molecular sieve (OMS-2) can be used as ideal supports to immobilize single-atom. Herein, we report a single-atom Pd catalyst (Pd1-OMS-2) that can afford silanes conversion of above 99% with silanols selectivity of over 99% using water as oxidant under mild conditions, outperforming the original OMS-2. The as-synthesized catalyst exhibits great functional group tolerance and good catalyst stability without aggregation after reaction. And the enhanced catalytic activity is attributed to the decoration of atomic Pd and the increase in content of oxygen vacancies. Characterization of the Pd1-OMS-2 indicates that the highly dispersed Pd species are trapped into the framework of OMS-2 by substituting Mn ions, which results in the formation of Pd–O bonds with the adjacent O atoms.

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