Temperature-driven mechanistic transition in propylene oxidation over Pt/CeO2 ensemble catalysts

Zihao Li, Xingyan Chen, Yao Lv, Sheng Dai, Huazhen Chang, Zhenguo Li, Kailong Ye, Fudong Liu (), Lei Ma () and Naiqiang Yan
Additional contact information
Zihao Li: Shanghai Jiao Tong University
Xingyan Chen: Shanghai Jiao Tong University
Yao Lv: East China University of Science and Technology
Sheng Dai: East China University of Science and Technology
Huazhen Chang: Renmin University of China
Zhenguo Li: China Automotive Technology & Research Center Co. Ltd.
Kailong Ye: University of California
Fudong Liu: University of California
Lei Ma: Shanghai Jiao Tong University
Naiqiang Yan: Shanghai Jiao Tong University

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Pt/CeO2 ensemble catalysts are promising for propylene (C3H6) oxidation in vehicle exhaust, yet identifying the intrinsic active sites and understanding how the metal-support interface evolves at varying reaction temperatures remains contentious. Herein, we demonstrate that H2-activated Pt/CeO2 ensemble catalysts feature metallic Pt ensembles as intrinsic active sites, lowering the 50% conversion temperature by 120 °C after hydrogen activation. Various operando characterization techniques reveal an approximately 170 °C threshold temperature for the dynamic change of the reaction models. Meanwhile, kinetics and theoretical analysis illustrates that oxygen-facilitated dehydrogenation of sp3 C-H bonds is the rate-determining step. At low temperatures, both C3H6 and O2 adsorb and activate on metallic Pt, without CeO2 involvement. Once the temperature exceeds threshold, C3H6 fully covers Pt sites, while O2 activates over Pt-O-Ce interfaces and participates in dehydrogenation. This study highlights the dynamic nature of oxygen activation, leading to distinct reaction temperature regimes during C3H6 oxidation.

Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-025-64243-y Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-64243-y

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-025-64243-y

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().