CO2 reforming of methane over supported LaNiO3 perovskite-type oxides

• Published in: Applied catalysis. B, Environmental Vol. 221; pp. 349 - 361
• Main Authors: Rabelo-Neto, R.C., Sales, H.B.E., Inocêncio, C.V.M., Varga, E., Oszko, A., Erdohelyi, A., Noronha, F.B., Mattos, L.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2018
• Subjects: Biogas; CO2 reforming of methane; Hydrogen production; LaNiO3/CeSiO2 catalyst; CO2 reforming of methane; Biogas; LaNiO3/CeSiO2 catalyst; Hydrogen production
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2017.09.022

[Display omitted] •CO2 reforming of methane was carried out over supported LaNiO3 perovskite-type oxides.•Supporting LaNiO3 over CeSiO2 significantly decreased the deposition of carbon.•High oxygen mobility of CeSiO2 promotes the removal of carbon.•Carbon oxidation by the oxygen of ceria inhibited the nickel carbide formation. 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.