Effect of the support on the mechanism of partial oxidation of methane on platinum catalysts |
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| Authors: | Fabio B Passos Elaine R Oliveira Lisiane V Mattos Fabio B Noronhe |
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| Affiliation: | (1) Universidade Federal Fluminense, Rua Passo da Pátria, CEP 24210-240, 156, Niterói, RJ, Brazil;(2) Instituto Nacional de Tecnologia, Av. Venezuela, CEP 20081-312, 82, Rio de Janeiro, RJ, Brazil |
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| Abstract: | The partial oxidation of methane was studied 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 behavior was explained by a change in the reaction mechanism. |
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| Keywords: | Methane Natural gas Partial oxidation Pt/CeO2 Pt/Y2O3 |
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