Thiourea ModificationPromoting the Activity on Pt/CeO₂ for CO Oxidation by Weakeningthe Metal–Support Interaction

Supported metal catalysts play a vital role in the chemical industry; however, ensuring high activity while maintaining high stability remains a significant challenge. Herein, a strategy for modulating the metal–support interactions (MSIs) in CeO₂-supported Pt-based catalyst via doping N into ceria using thiourea as a dopant (Pt/TA-CeO₂) is proposed, through which excellent low-temperature CO oxidation activity and recycling stability are achieved simultaneously. Experimental characterization results demonstrate that the introduction of thiourea properly alters the structural defects and electronic state of Pt in the Pt/TA-CeO₂ catalyst, thereby weakening the metal–support interaction. As a result, the complete conversion temperature of Pt/TA-CeO₂ decreases from 200 to 150 °C while still maintaining high activity after 11 cycles of CO oxidation. This work offers valuable insights into modulating the catalytic capability in essential reactions by regulating the metal–support interactions in supported metal catalysts.