Boosting the Activity of Single-Atom Pt1/CeO2 via Co Doping for Low-Temperature Catalytic Oxidation of CO

The properties of supports have a significant effect on the activity of noble metal single atoms. In this work, Co-doped CeO₂-supported single-atom Pt catalysts (Pt₁/Co-CeO₂) have been acquired by a synchronous pyrolysis/deposition route and demonstrated to promote low-temperature oxidation of CO. Revealed by a model reaction of 1% CO + 1% O₂ + 98% He at a space velocity of 12,000 mL/g_cat/h, CO conversion (100 °C) acquired on a (0.5% Pt)/(10% Co-CeO₂) catalyst (36.6%) was 3.6 and 4.9 times those of 0.5% Pt/CeO₂ (10.0%) and 10% Co-CeO₂ (7.4%) catalysts and 2.1 times that of their conversion sum (17.4%), confirming the positive role of the Co dopant in boosting the low-temperature oxidation of CO. The consistent results are also verified in the comparison of Pt₁/Co-ZnO with Pt₁/ZnO and Pt₁/Co-Al₂O₃ with Pt₁/Al₂O₃. In addition, the activity of single-atom Pt₁/Co-CeO₂ catalysts can be facilely modified by changing the loading of Pt and/or doping amount of Co. These reasonable data will provide a methodology to access more applicable catalysts for CO oxidation at low temperature.