Boosting the Activity of Single-Atom Pt 1 /CeO 2 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 CeO 2 -supported single-atom Pt catalysts (Pt 1 /Co-CeO 2 ) 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% O 2 + 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-CeO 2 ) catalyst (36.6%) was 3.6 and 4.9 times those of 0.5% Pt/CeO 2 (10.0%) and 10% Co-CeO 2 (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 Pt 1 /Co-ZnO with Pt 1 /ZnO and Pt 1 /Co-Al 2 O 3 with Pt 1 /Al 2 O 3 . In addition, the activity of single-atom Pt 1 /Co-CeO 2 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.