Metal-support interaction in supported Pt single-atom catalyst promotes lattice oxygen activation to achieve complete oxidation of acetone at low concentrations.

A precious metal catalyst with loaded Pt single atoms was prepared and used for the complete oxidation of CHO. Detailed results show that the T of the 1.5Pt SA/γ-AlO catalyst in the oxidation process of acetone is 250 °C, the TOF of Pt is 1.09 × 10 s, and the catalyst exhibits good stability. Characterization reveals that the high dispersion of Pt single atoms and strong interaction with the carrier improve the redox properties of the catalyst, enhancing the adsorption and dissociation capability of gaseous oxygen. DFT calculations show that after the introduction of Pt, the oxygen vacancy formation energy on the catalyst surface is reduced to 1.2 eV, and PDOS calculations prove that electrons on Pt atoms can be quickly transferred to O atoms, increasing the number of electrons on the σ * bond and promoting the escape of lattice oxygen. In addition, in situ DRIFTS and adsorption experiments indicate that the CHO oxidation process follows the Mars-van Krevelen reaction mechanism, and CH =C(CH)=O, O* (O), formate, acetate, and carbonate are considered as the main intermediate species and/or transients in the reaction process. Particularly, the activation rate of O and the cleavage of the -C-C- bond are the main rate-determining steps in the oxidation of CHO. This work will further enhance the study of the oxidation mechanism of oxygenated volatile organic pollutants over loaded noble metal catalysts.