CO2 reforming of methane over supported LaNiO3 perovskite-type oxides

R. C. Rabelo-Neto, H. B.E. Sales, C. V.M. Inocêncio, E. Varga, A. Oszko, A. Erdohelyi, F. B. Noronha, L. V. Mattos

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Abstract

This work investigated the performance of supported LaNiO3 perovskite-type oxides for the CO2 reforming of methane. The methane and CO2 conversion increased at the beginning of reaction for LaNiO3 and LaNiO3/Al2O3 catalysts. On the other hand, conversion remained quite constant for LaNiO3/CeSiO2. in situ XPS experiments under reaction conditions revealed that the metallic Ni particles were oxidized by CO2 from the feed for LaNiO3 and LaNiO3/Al2O3 catalysts. Ceria support was preferentially oxidized, limiting the oxidation of the metallic phase. Raman spectroscopy and thermogravimetric analysis showed that carbon was formed mainly over LaNiO3 and LaNiO3/Al2O3 catalysts. Supporting LaNiO3 over CeSiO2 almost completely suppressed carbon deposition. in situ XPS experiments showed a continuous change of ceria oxidation states between Ce4+ and Ce3+ under reaction conditions. This result in a high oxygen mobility of ceria support that reacts with carbon, inhibiting the formation of nickel carbide and consequently the nucleation and growth of carbon filaments.

Original languageEnglish
Pages (from-to)349-361
Number of pages13
JournalApplied Catalysis B: Environmental
Volume221
DOIs
Publication statusPublished - jan. 1 2018

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ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

Rabelo-Neto, R. C., Sales, H. B. E., Inocêncio, C. V. M., Varga, E., Oszko, A., Erdohelyi, A., Noronha, F. B., & Mattos, L. V. (2018). CO2 reforming of methane over supported LaNiO3 perovskite-type oxides. Applied Catalysis B: Environmental, 221, 349-361. https://doi.org/10.1016/j.apcatb.2017.09.022