Multifunctional MoOx interfacial engineering on Pt/Al2O3 for steam-tolerant complete propane oxidation: Coupling hydroxyl-site blocking with proximal acidity

Lv, Yao, Wang, Xin, Ge, Shasha, Xu, Aijie, Dai, Sheng, Ye, Jiajie, Jiang, Zhongyu, Dai, Qiguang, Wang, Aiyong, Guo, Yanglong, Zhan, Wangcheng, Wang, Li, Guo, Yun and Tang, Xuan 2026. Multifunctional MoOx interfacial engineering on Pt/Al2O3 for steam-tolerant complete propane oxidation: Coupling hydroxyl-site blocking with proximal acidity. Applied Catalysis B: Environment and Energy 393 , 126742. 10.1016/j.apcatb.2026.126742

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Abstract

Complete propane oxidation at low temperatures remains challenging, especially under humid feeds. Here, we propose a multifunctional surface-modification strategy for Pt/Al2O3 by introducing MoOx to couple hydroxyl-site blocking guided Pt ensemble regulation with proximal acidity and suppressed support hydrophilicity. MoOx species competitively occupy reactive hydroxyl anchoring sites on γ-Al2O3, thereby suppressing Pt dispersion and promoting the formation of larger, more metallic Pt nanoparticles with intimate Pt-MoOx contact. Meanwhile, MoOx generates acid sites near Pt, providing additional propane adsorption/activation capability and enabling richer surface intermediate evolution, which is consistent with weakened oxygen inhibition and enhanced propane dependence. The optimized Pt12Mo/Al2O3 catalyst achieves a markedly lower light-off temperature (T90 = 230 °C) than Pt/Al2O3 (T90 = 342 °C), delivering a ∼46-fold higher intrinsic activity at 200 °C and a substantially reduced apparent activation energy. Importantly, MoOx-induced hydroxyl consumption lowers the density of hydrophilic sites and reduces overall H2O uptake, resulting in excellent steam tolerance and durability under 5 vol% H2O.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Computer Science & Informatics
Publisher:	Elsevier BV
ISSN:	0926-3373
Date of Acceptance:	29 March 2026
Last Modified:	07 Apr 2026 11:45
URI:	https://orca.cardiff.ac.uk/id/eprint/186225

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