Methane oxidation by lattice oxygen of CeNbO4+delta

resumo

The reactivity of methane with lattice oxygen of cerium niobate, CeNbO4+delta, was studied by temperature-programmed reduction (TPR) in dry CH4 flow at 523-1073 K. Phase transformations and reduction of cerium niobate at 900-1023 K lead to a massive release of hyperstoichiometric oxygen, in amounts determined by the intermediate-temperature phase composition dependent on thermal history. In this temperature range, CH4-TPR shows prevailing formation of carbon monoxide and steam, suggesting that the synthesis gas generation occurs in parallel with extensive oxidation of H-2 on the cerium niobate surface. At 1073 K when delta -> 0, the reaction of methane with CeNbO4+delta selectively yields synthesis gas with H-2/CO ratio close to two. (c) 2006 Elsevier B.V. All rights reserved.

palavras-chave

SYNTHESIS GAS; DOPED CERIA; CATALYSTS; STABILITY; NIOBATES; OXIDE

categoria

Chemistry

autores

Yaremchenko, AA; Kharton, VV; Veniaminov, SA; Belyaev, VD; Sobyanin, VA; Marques, FMB

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