Long-term stability of Pt/Ce0.8Me0.2O2-γ/Al2O3 (Me = Gd, Nb, Pr, and Zr) catalysts for steam reforming of methane - Université de Lille Accéder directement au contenu
Article Dans Une Revue International Journal of Hydrogen Energy Année : 2022

Long-term stability of Pt/Ce0.8Me0.2O2-γ/Al2O3 (Me = Gd, Nb, Pr, and Zr) catalysts for steam reforming of methane

Résumé

This study investigated the influence of dopants (Gd, Nb, Pr, and Zr) on the performance of Pt/CexMe1-xO2-γ/Al2O3 catalysts for the methane steam reforming (SRM) at 1073 K and at different space velocities. In-situ XRD, in-situ XANES, and Raman spectroscopy revealed the formation of a solid solution on the supports with Gd, Pr and Zr and an improvement in reducibility. No evidence of complete niobium inclusion into the ceria framework was observed and AlNbO4 and CeNbO4 phases were detected. All catalysts exhibited a severe initial deactivation, however, with Pt/CeNb/Al being most stable. Analyses of all spent catalysts revealed a negligible carbon deposition during the catalytic tests. TEM, XRD and N2 physisorption showed a collapse of the alumina structure and sintering of Pt particles as causing the early deactivation. The formation of segregated phases for Nb-doped ceria improved the thermal resistance of alumina and provided a closer contact with Pt crystallites, resulting in better stability.
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Dates et versions

hal-04254341 , version 1 (23-10-2023)

Identifiants

Citer

Israel R. Azevedo, Andressa A. A. da Silva, Yutao T. Xing, Raimundo C. Rabelo-Neto, Niels T. J. Luchters, et al.. Long-term stability of Pt/Ce0.8Me0.2O2-γ/Al2O3 (Me = Gd, Nb, Pr, and Zr) catalysts for steam reforming of methane. International Journal of Hydrogen Energy, 2022, International Journal of Hydrogen Energy, 47 (35), pp.15624-15640. ⟨10.1016/j.ijhydene.2022.03.067⟩. ⟨hal-04254341⟩
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