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Catalysts, Volume 15, Issue 8 (August 2025) – 1 article

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14 pages, 3849 KiB  
Article
Alkaline Earth Carbonate Engineered Pt Electronic States for High-Efficiency Propylene Oxidation at Low Temperatures
by Xuequan Sun, Yishu Lv, Yuan Shu, Yanglong Guo and Pengfei Zhang
Catalysts 2025, 15(8), 696; https://doi.org/10.3390/catal15080696 (registering DOI) - 22 Jul 2025
Abstract
Alkaline earth elements have emerged as crucial electronic modifiers for regulating active sites in catalytic systems, yet the influence of metal–support interactions (MSIs) between alkaline earth compounds and active metals remains insufficiently understood. This study systematically investigated Pt nanoparticles supported on alkaline earth [...] Read more.
Alkaline earth elements have emerged as crucial electronic modifiers for regulating active sites in catalytic systems, yet the influence of metal–support interactions (MSIs) between alkaline earth compounds and active metals remains insufficiently understood. This study systematically investigated Pt nanoparticles supported on alkaline earth carbonates (Pt/MCO3, M = Mg, Ca, Ba) for low-temperature propylene combustion. The Pt/BaCO3 catalyst exhibited outstanding performance, achieving complete propylene conversion at 192 °C, significantly lower than Pt/MgCO3 (247 °C) and Pt/CaCO3 (282 °C). The enhanced activity stemmed from distinct MSI effects among the supports, with Pt/BaCO3 showing the poorest electron enrichment and lowest propylene adsorption energy. Through kinetic analyses, 18O2 isotope labeling, and comprehensive characterization, the reaction was confirmed to follow the Mars–van Krevelen (MvK) mechanism. Pt/BaCO3 achieves an optimal balance between propylene and oxygen adsorption, a critical factor underlying its superior activity. Full article
(This article belongs to the Section Catalytic Materials)
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