Catalytic oxidation of dichloromethane over Pt-Co/HZSM-5 catalyst: Synergistic effect of single-atom Pt, Co3O4, and HZSM-5

The catalytic degradation of chlorinated volatile organic compounds (CVOCs) at low temperatures is a great challenge. In this work, Pt-Co/HZSM-5 ternary catalysts were synthesized and used for the oxidation dichloromethane (DCM). By adding only trace amounts Pt (0.01 wt. %), catalyst exhibits better CO2 yield lower by-product than Co/HZSM-5 catalyst. Besides, it maintained stable activity least 45 h without substantial changes. addition water vapor to DCM process on was shown promote conversion, yield, HCl yield. Catalyst characterization shows that Co (in form Co3O4) could effectively anchor atoms, thus realizing single-atom dispersion Pt. turn, formed increases proportion oxygen vacancies surface Co3O4, thereby enhancing redox properties Co3O4. process, first adsorbed dechlorinated HZSM-5 due abundant acid sites then completely dissociated under interaction Co. Thanks synergies Pt, Co, HZSM-5, exhibited appropriate ability, suitable distribution sites, sufficient oxygen, possibly explaining its yields more efficient formation desorption HCl.