Abstract
A kind of Pd0.01Ce0.75Zr0.25O2 hollow nanospheres surrounded by small nanoparticles prepared by flame spray pyrolysis (FSP) method (Pd0.01Ce0.75Zr0.25O2-F) were used for methane oxidation in electric field. Compared with the samples synthesized by solution combustion method, more Pd active sites is exposed to Pd0.01Ce0.75Zr0.25O2-F catalyst surface and it shows higher redox performance. The methane conversion over Pd0.01Ce0.75Zr0.25O2-F is higher (T50 = 320 °C in 5 mA electric field, GHSV = 50,000 ml·g−1·h−1), and the turnover frequency (TOF) is significantly increased (ΔTOF = 4.33 × 10-4 × s−1) under the effect of electric field. There is a strong interaction between electric field and Ce-Zr metastable structure, which is due to the higher content of surface hydroxyl groups on Pd0.01Ce0.75Zr0.25O2-F surface.
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