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Effect of the support on the mechanism of partial oxidation of methane on platinum catalysts

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Abstract

The partial oxidation of methane was studio on Pt/Al2O3, Pt/ZrO2, Pt/CeO2 and Pt/Y2O3 catalysts. For Pt/Al2O3, Pt/ZrO2 and Pt/CeO2, temperature programmed surface reaction (TPSR) studies showed partial oxidation of methane comprehends two steps: combustion of methane followed by CO2 and steam reforming of unreacted methane, while for Pt/Y2O3 a direct mechanism was observed. Oxygen Storage Capacity (OSC) evaluated the reducibility and oxygen transfer capacity of the catalysts. Pt/CeO2 catalyst showed the highest stability on partial oxidation. The results were explained by the higher reducibility and oxygen storage/release capacity which allowed a continuous removal of carbonaceous deposits from the active sites, favoring the stability of the catalyst. For Pt/Al2O3 and Pt/ZrO2 catalysts the increase of carbon deposits around or near the metal particle inhibits the CO2 dissociation on CO2 reforming of methane. Pt/Y2O3 was active and stable for partial oxidation of methane and its behaviour was explained by a change in the reaction mechanism.

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Authors and Affiliations

  1. Universidade Federal Fluminense, Rua Passo da Pátria, 156, Niterói, RJ, CEP 24210-240, Brazil

    Fabio B. Passos & Elaine R. Oliveira

  2. Instituto Nacional Technologia, Av. Venezuela, 82, Rio de Janerio, RJ, CEP 20081-312, Brazil

    Lisiane V. Mattos & Fabio B. Noronha

Authors
  1. Fabio B. Passos
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  2. Elaine R. Oliveira
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  3. Lisiane V. Mattos
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  4. Fabio B. Noronha
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Correspondence to Fabio B. Passos.

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Passos, F.B., Oliveira, E.R., Mattos, L.V. et al. Effect of the support on the mechanism of partial oxidation of methane on platinum catalysts. Catal Lett 110, 161–167 (2006). https://doi.org/10.1007/s10562-006-0105-z

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  • DOI: https://doi.org/10.1007/s10562-006-0105-z

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