Catalytic Activity of Y and Fe co-Doped Srtio_3 Perovskites for Methane Oxidation

Y and Fe co-doped SrTiO_3 powder with a phase-pure perovskite structure were synthesized by solid state reaction (SSR) and the Pechini method. The catalytic activity of Y_(0.08)Sr_(0.92)Fe_xTi_(1-x)O_3 (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. KCI Citation Count: 14