Catalytic activity of Y and Fe co-doped SrTio3 perovskites for methane oxidation

Abstract

Y and Fe co-doped SrTiO3 powder with a phase-pure perovskite structure were synthesized by solid state reaction (SSR) and the Pechini method. The catalytic activity of Y0.08Sr0.92FexTi1-xO3-δ (x = 0.1, 0.2, 0.3, and 0.4) for the methane oxidation reaction was evaluated in terms of the iron content in the perovskite lattice. When the CH4/O2 ratio was 0.25, the total oxidation of methane was predominant. Methane oxidation started at 450ºC and increased with increasing temperature. The methane conversion rate strongly depended on the iron content. With higher iron content, the methane conversion rate was accordingly enhanced. This phenomenon may be attributed to the presence of oxygen vacancies in the perovskite lattice. At a CH4/O2 ratio=2, a partial oxidation reaction occurred at temperature above 750°C.

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Application of a sensitive catalytic reactor to the study of CO oxidation over SrTiO3(100) and BaTiO3/SrTiO3(100) ferroelectric surfaces

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Catalytic combustion of methane by perovskite-type oxide nanoparticles as pollution prevention strategy

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