Enhanced CO Oxidation on PtO <sub>x</sub> Raft Species Synthesized via Citric Acid‐Assisted Electrostatic Adsorption
Abstract
Abstract Platinum‐based catalysts have attracted considerable attention for CO oxidation, with their activity critically dependent on the nanostructures of Pt species. Herein, raft‐structured PtO x species on CeO 2 support (Pt/CeO 2 ‐CA) were successfully prepared via a citric acid‐assisted strong electrostatic adsorption (SEA) method, which leveraged competitive adsorption between noble metal precursors and organic compounds. The Pt/CeO 2 ‐CA catalyst exhibits a T 50 (temperature for 50% CO conversion) over 120 °C lower than those of Pt single atoms and PtO x clusters‐based catalysts, and the lowest apparent activation energy among the catalysts investigated, as well as reported analogues, demonstrating its excellent activity in CO oxidation. Combined catalyst characterization and density functional theory (DFT) calculations demonstrate enhanced CO adsorption on PtO x rafts with respect to Pt/CeO 2 reference catalysts composed of Pt single atoms or PtO x clusters, and favored CO interaction with O* atoms from PtO x rafts and the CeO 2 surface. We propose that this mitigates CO poisoning effects by circumventing competitive adsorption with O 2 , thereby accelerating the catalytic reaction. Our findings highlight promising design strategies for tuning the morphology of supported noble metal (oxide) nanostructures to further enhance their catalytic performances.
Article Details
Authors (9)
Jiaorong Yan
Qiguang Dai
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis School of Chemistry and Molecular Engineering East China University of Science and Technology–Utrecht University Joint Research Center for Sustainable and Circular Chemistry and Chemical Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 P.R. China
Hui Wang
Zhi‐qiang Wang
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Center for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai China
Jihang Yu
Sheng Dai
Matteo Monai
Inorganic Chemistry and Catalysis group Institute for Sustainable and Circular Chemistry East China University of Science and Technology – Utrecht University Joint Research Center for Sustainable and Circular Chemistry and Chemical Engineering Utrecht University Universiteitsweg 99 Utrecht 3584 CG The Netherlands
Bert M. Weckhuysen
Inorganic Chemistry and Catalysis group, Institute for Sustainable and Circular Chemistry, Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
Wangcheng Zhan