Publicado

2010-07-01

METHANE PARTIAL OXIDATION BY THE LATTICE OXYGEN OF THE LANIO₃δ PEROVSKITE. A PULSE STUDY

Palabras clave:


Methane partial oxidation, lattice oxygen, LaNiO3δ perovskite, auto combustion method (es)

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Autores/as

  • GERMÁN SIERRA GALLEGO Escuela de Ingeniería de Materiales, Universidad Nacional de Colombia, Colombia
  • CATHERINE BATIOT-DUPEYRAT Laboratoire de Catalyse en Chimie Organique, UMR CNRS 6503, Université de Poitiers, Ecole Supérieure d’Ingénieurs de Poitiers
  • FANOR MONDRAGÓN Instituto de Química, Universidad de Antioquia,Colombia
LaNiO₃ perovskite was prepared by the selfcombustion 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⁺ 0.63O2.68. When unreduced LaNiO3d perovskite is used, only 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 quasistationary 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

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