Abstract

SIERRA GALLEGO, Germán; BATIOT-DUPEYRAT, Catherine  and  MONDRAGON, Fanor. METHANE PARTIAL OXIDATION BY THE LATTICE OXYGEN OF THE LANIO_3-D PEROVSKITE. A PULSE STUDY. Dyna rev.fac.nac.minas [online]. 2010, vol.77, n.163, pp.141-150. ISSN 0012-7353.

LaNiO₃ perovskite was prepared by the self-combustion method and tested as catalyst for CH₄ activation using the oxygen lattice at 700°C and 800°C. Based on the non-stoichiometry experiments, the perovskite formula is written as La³⁺Ni³⁺_0.37Ni²⁺_0.63O_2.68. When unreduced LaNiO_3-d perovskite is used, only b-type oxygen species were responsible for the partial CH₄ oxidation. Over non reduced perovskite high CH₄ conversions to H₂ and CO were obtained. CH₄ conversion and H₂, CO and CO₂, selectivities under quasi-stationary conditions were 100%, 80%, 98% and 2 % respectively at 800°C. At the beginning of the reaction, a complete oxidation of methane to CO₂ and H₂O took place, whereas a partial oxidation to CO and H₂ was observed after that period. In such conditions the H₂/CO molar ratio obtained was 1.7, indicating a contribution of the parallel reverse water gas shift reaction

Keywords : Methane partial oxidation; lattice oxygen; LaNiO_3- perovskite; auto combustion method.

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