The effects of La2O3 on the structural properties of La2O3–Al2O3 prepared by 
the sol–gel method and on the catalytic performance of Pt/La2O3–Al2O3 towards 
steam reforming and partial oxidation of methane

Araujo, J.C.S.; Zanchet, D.; Rinaldi, Roberto; Schuchardt, U.; Hori, C.E.; Fierro, J.L.G.; Bueno, J.M.C.

doi:10.1016/j.apcatb.2008.05.011

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The effects of La₂O₃ on the structural properties of La₂O₃–Al₂O₃ prepared by the sol–gel method and on the catalytic performance of Pt/La₂O₃–Al₂O₃ towards steam reforming and partial oxidation of methane

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Rinaldi, Roberto
Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Institute of Chemistry, Universidade Estadual de Campinas, 13083-970 Campinas, SP, Brazil;

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Araujo, J., Zanchet, D., Rinaldi, R., Schuchardt, U., Hori, C., Fierro, J., et al. (2008). The effects of La₂O₃ on the structural properties of La₂O₃–Al₂O₃ prepared by the sol–gel method and on the catalytic performance of Pt/La₂O₃–Al₂O₃ towards steam reforming and partial oxidation of methane. Applied Catalysis B: Environmental, 84(3-4), 552-562. doi:10.1016/j.apcatb.2008.05.011.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-2447-5

Abstract

The effect of La₂O₃ content on the structural properties and catalytic behavior of Pt/xLa₂O₃–Al₂O₃ catalysts in steam reforming of methane and partial oxidation of methane was investigated. There was a decrease in the density of Pt sites with the increase of La₂O₃ loadings according to Fourier transform infrared spectroscopy of adsorbed CO and to dehydrogenation of cyclohexane results. However, transmission electron microscopy data indicates an opposite trend. This apparent disagreement could be due to the CH₄ turnover rates and specific rates of steam reforming of methane increased for higher La₂O₃ loadings. The Pt/Al₂O₃ catalyst was strongly deactivated during partial oxidation of methane, while La₂O₃-containing catalysts exhibited higher stability. The increase of activity observed during the reactions was ascribed to the ability of the [LaPtxO]Pt0-like species to promote the gasification of coke. This cleaning mechanism led to higher accessibility of the active sites to CH₄.