Tuning the A-site Element in LaCo<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3</sub> Perovskite-based Catalyst for High Temperature N<sub>2</sub>O Decomposition in Nitric Acid Plant - Université de Lille Accéder directement au contenu
Article Dans Une Revue ChemistrySelect Année : 2024

Tuning the A-site Element in LaCo0.8Fe0.2O3 Perovskite-based Catalyst for High Temperature N2O Decomposition in Nitric Acid Plant

P. Zheng
  • Fonction : Auteur
F. Q. He
  • Fonction : Auteur
Y. H. Wu
  • Fonction : Auteur
J. H. Yang
  • Fonction : Auteur
F. L. Jing
  • Fonction : Auteur

Résumé

The effect of La-deficiency and Ce/Sr-substitution in the benchmark LaCo0.8Fe0.2O3 has been investigated for the decomposition of N2O between 500 and 900 °C. Real inlet gas composition and space velocity reveal that La-deficiency and Ce/Sr-substitution can improve the thermal stability of catalyst, while La1-xSrxCo0.8Fe0.2O3 with x≥0.1 was highlighted as a promising formula due to the strongest resistance to deactivation and suppressed undesired NOx decomposition at high space velocity. This phenomenon is mainly ascribed to the incorporation of Sr2+ into the perovskite lattice during the reaction consequently stabilizing the Co3+ species and creating the oxygen vacancies in La1-xSrxCoO3-δ. On the contrary, the loss of activity on Ce-substituted LaCo0.8Fe0.2O3 has been preferentially related to the cobalt exsolution to extra framework of perovskite making the catalytic cycle with Co3+ unfavorable. All these bulk and surface changes are accompanied with opposite evolution of apparent activation energy and pre-exponential factor which can be discussed based on a redox mechanism.

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Dates et versions

hal-04601514 , version 1 (05-06-2024)

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Citer

P. Zheng, F. Q. He, Y. H. Wu, J. H. Yang, F. L. Jing, et al.. Tuning the A-site Element in LaCo0.8Fe0.2O3 Perovskite-based Catalyst for High Temperature N2O Decomposition in Nitric Acid Plant. ChemistrySelect, 2024, ChemistrySelect, 9, ⟨10.1002/slct.202304026⟩. ⟨hal-04601514⟩
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