Yttrium stabilization and Pt addition to Pd/ZrO2catalyst for the oxidation of methane in the presence of ethylene and water

Article abstract of DOI:10.1039/d0ra10773e

Catalytic oxidation is the most efficient method of minimizing the emissions of harmful pollutants and greenhouse gases. In this study, ZrO₂-supported Pd catalysts are investigated for the catalytic oxidation of methane and ethylene. Pd/Y₂O₃-stabilized ZrO₂(Pd/YSZ) catalysts show attractive catalytic activity for methane and ethylene oxidation. The ZrO₂support containing up to 8 mol% Y₂O₃improves the water resistance and hydrothermal stability of the catalyst. All catalysts are characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), O₂-temperature-programmed desorption (O₂-TPD), and CO-chemisorption techniques. It shows that high Pd dispersion and Pd-PdO reciprocation on the Pd/YSZ catalyst results in relatively high stability.In situdiffuse reflectance infrared Fourier-transform (DRIFT) experiments are performed to study the reaction over the surface of the catalyst. Compared with bimetallic catalysts (Pd?:?Pt), the same amounts of Pd and Pt supported on ZrO₂and Y₂O₃-stabilized ZrO₂catalysts show enhanced activity for methane and ethylene oxidation, respectively. A mixed hydrocarbon feed, containing methane and ethylene, lowers the CH₄light-off temperature by approximately 80 °C. This shows that ethylene addition has a promotional effect on the light-off temperature of methane.