Methane catalytic combustion on La-based perovskite catalysts |
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Institution: | 1. Instituto de Superficies y Catálisis, Facultad de Ingeniería, Universidad del Zulia, Maracaibo 4003A, Venezuela;2. Instituto Zuliano de Investigaciones Tecnológicas, km 15 carretera Vía a la Cañada, Apartado 331, Venezuela |
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Abstract: | Two series of La-based perovskites oxides (La1–xSrxMO3–y with M=Fe or Co) have been used as methane total oxidation catalysts. The best catalytic performances, in isothermal, high temperature conditions (900 °C), in the presence of water and carbon dioxide, were obtained for both series when 20 % of lanthanum cations are replaced by strontium. The catalytic behavior of the two series of catalysts is quite similar, although the cobalt-containing samples are easily reducible by H2 or CH4, whereas the iron-containing ones are not reduced in the same conditions. It is proposed, to explain this apparent inconsistency, that the active sites reoxidation process occurs directly from the molecular oxygen of the gas phase, without participation of the bulk oxygen species mobility. |
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