Breaking the trade-off between Pt chemical state and active site density by SiOx engineering on Pt/TiO2 for complete propane oxidation

Xu, Aijie, Ge, Shasha, Yu, Anwen, Jiang, Zhongyu, Wang, Aiyong, Zhan, Wangcheng, Guo, Yanglong, Wang, Li, Tang, Xuan and Guo, Yun 2026. Breaking the trade-off between Pt chemical state and active site density by SiOx engineering on Pt/TiO2 for complete propane oxidation. Applied Catalysis B: Environment and Energy 382 , 125958. 10.1016/j.apcatb.2025.125958

Full text not available from this repository.

Abstract

The elimination of propane is a key task in reducing volatile organic compounds (VOCs) emissions. Supported platinum-based catalysts hold promise for complete propane oxidation, but the trade-off between Pt chemical state and active site density remains a challenge. In this study, we developed a high-performance, low-Pt-loading catalyst (Pt@SiOx/TiO2 with 0.2 wt% Pt loading) using a SiOx interfacial engineering strategy on TiO2-supported Pt (Pt/TiO2) to address this trade-off. Unlike conventional Pt/TiO2 catalysts, the amorphous SiOx layers strategically modulate the Pt-TiO2 interaction by uniformly covering the TiO2 surface, leading to a higher proportion of active metallic Pt nanoparticles with an optimized size (∼5 nm). Simultaneously, the engineered Pt-SiOx interface functions as additional reactive sites, synergistically enhancing the catalytic activity alongside the active metallic Pt species. Mechanistic analysis revealed that both Pt@SiOx/TiO2 and Pt/TiO2 catalysts exhibit strong C–H bond activation capabilities, while SiOx modification further enhances the ability to cleave intermediate C–C/Cdouble bondC bonds. Consequently, the Pt@SiOx/TiO2 catalyst achieved an 80 °C reduction in the temperature at which 90 % propane conversion and a 27-fold increase in reaction rate compared to the Pt/TiO2 catalyst during complete propane oxidation. This study provides a valuable strategy for realizing cost-effective VOCs oxidation catalysts.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Chemistry
Publisher:	Elsevier
ISSN:	0926-3373
Date of Acceptance:	11 September 2025
Last Modified:	22 Sep 2025 11:01
URI:	https://orca.cardiff.ac.uk/id/eprint/181228

Actions (repository staff only)

Edit Item