It is challenging to achieve high selectivity over Pt-metal-oxide catalysts widely used in many selective oxidation reactions because Pt is prone to over-oxidize substrates. Herein, our sound strategy for enhancing the selectivity is to saturate the under-coordinated single Pt atoms with Cl ligands. In this system, the weak electronic metal-support interactions between Pt atoms and reduced TiO cause electron extraction from Pt to Cl ligands, resulting in strong Pt-Cl bonds. Therefore, the two-coordinate single Pt atoms adopt a four-coordinate configuration and thus inactivated, thereby inhibiting the over-oxidation of toluene over Pt sites. The selectivity for the primary C-H bond oxidation products of toluene was increased from 50.1 to 100%. Meanwhile, the abundant active Ti sites were stabilized in reduced TiO by Pt atoms, leading to a rising yield of the primary C-H oxidation products of 249.8 mmol g. The reported strategy holds great promise for selective oxidation with enhanced selectivity.
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