Oxygen vacancy enhanced oxidative dehydrogenation of propane with 7 carbon dioxide over PtSn/Ce_1-xLa_xO_2-δ

Abstract

Supported Pt-based catalysts are promising for the oxidative dehydrogenation of propane with CO₂ (CO₂-ODP), which is regarded as an attractive process for simultaneous propene production and CO₂ reduction to CO. By incorporating La³⁺ into CeO₂, we found that the performance of PtSn/Ce_1-xLa_xO_2-δ (x = 0, 0.05, 0.1 and 0.3) for CO₂-ODP is enhanced. Specifically, the propene yield over PtSn/CeO₂ dropped sharply from 17% to 3% after 21.83 h on stream. In contrast, the optimized PtSn/Ce_0.9La_0.1O_2-δ catalyst maintained a much higher propene yield, declining only slightly from 23% to 20%, confirming that La incorporation markedly enhances both activity and stability. Complementary characterization results demonstrate that doping low-valent La³⁺ into CeO₂ increases oxygen vacancies via charge compensation, strengthening the Pt–O bond within the Pt-O-Ce interface. This preferentially activates C–H bonds in propane while suppressing C-C scission, thereby increasing propene yield. Meanwhile, the increased oxygen vacancies accelerate CO₂ activation, sustaining the redox cycle and thus improving the catalyst stability. Owing to these synergistic effects, PtSn/Ce_0.9La_0.1O_2-δ exhibits excellent catalytic performance, outperforming most reported Pt-based catalysts These findings highlight that tuning oxygen vacancies at the metal-support interface is a promising strategy for developing efficient CO₂-ODP catalysts.

Keywords

propane / oxidative dehydrogenation / carbon dioxide / supported PtSn / lanthanum-doped ceria

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Higher Education Press 2027

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