Promoting Effect of Highly Dispersed PtSn/CeO2 Catalyst on Complete Oxidation of Methane
Supported metal catalysts are widely used in the complete oxidation of methane,with metal particle size being a critical factor in determining catalyst performance.For precious metal catalysts,higher dispersion is beneficial for enhancing catalytic activity and reducing cata-lyst costs.Addressing this issue,we achieved Pt dispersion under an inert atmosphere using CeO2 as a support and Sn as a promoter.The prepared catalyst samples were characterized to ana-lyze the physical structure and electronic properties of PtSn/CeO2 before and after treatment,and its catalytic effect on the complete oxidation of methane was studied.The results show that PtSn/CeO2 exhibits higher catalytic reactivity,achieving a 95％methane conversion at a reaction temperature of 450℃.This is mainly attributed to the addition of Sn,which weakens the dissoci-ation energy of Pt atoms from clusters and enhances the anchoring effect between Pt and CeO2.Using DFT calculations,we explain the reasons for the differences in Pt dispersion from a ther-modynamic perspective,providing new insights into the study of sintering and dispersion of active metals in catalysts.
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