Abstract
One of the problems of partial oxidation of methane (POM) catalysts is thermally unstabe due to the exothermic reaction. In this study, novel perovskite-type Sr0.92Y0.08TiO3-based catalysts were investigated for syn-gas production, which have strong thermal stability compared to the conventional catalysts prepared by metal dispersion on a ceramic support. Ru-doped Sr0.92Y0.08TiO3 catalysts were fabricated by using the Pechini method. The prepared catalysts were characterized to check the perovskite structure as a function of Ru dopant amount and to understand the details of the activating catalyst mechanism using X-ray fluorescence (XRF), Brunauer-Emmet-Teller measurements (BET), X-ray photoelectron spectroscopy (XPS), Temperature-programmed reduction (TPR), and Transmission electron microscopy (TEM). The reforming of methane over the Ru-doped Sr0.92Y0.08TiO3 catalysts has been extensively investigated and the catalysts showed much higher activity on POM compared with the conventional catalysts. Moreover, the Ru-doped Sr0.92Y0.08TiO3 catalysts exhibited very strong thermal stability, too. After the POM reforming reaction, we have found that the nano-sized Ru is exsoluted on the Sr0.92Y0.08TiO3 catalyst surface. Consequently, the exsolution is the main reason for high activity on POM and good thermal stability.
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