Pt-based catalysts exhibit low energy consumption and high efficiency in low-temperature ethylene oxidation,which can reduce their hazards to the environment and human health.However,Pt/γ-Al2O3 often shows insufficient low-temperature activity due to the chemical inertness of the support surface.In this study,alumina support was modified with sulfuric acid,followed by Pt loading,and the effects and underlying mechanisms of this modification on low-temperature ethylene oxidation were systematically investigated.The results demonstrate that sulfur is dispersed on the support surface in the form of sulfate ions,without altering the pore structure and crystalline framework of the support.In-situ Fourier transform infrared (FT-IR) spectroscopy reveals that the essential role of sulfate ions in promoting ethylene oxidation lies in the significant inhibition of the accumulation of intermediates such as formate species by surface sulfates.Additionally,the Pt/Al-2.3S catalyst exhibits long-term stability and reversible recovery capability against water vapor disturbance.This work provides a modification strategy for achieving efficient low-temperature ethylene oxidation over Pt catalysts supported on inert carriers.
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