Methane oxidation by lattice oxygen of CeNbO4+delta
authors Yaremchenko, AA; Kharton, VV; Veniaminov, SA; Belyaev, VD; Sobyanin, VA; Marques, FMB
nationality International
journal CATALYSIS COMMUNICATIONS
author keywords cerium niobate; methane oxidation; synthesis gas; temperature-programmed reduction; thermal analysis
keywords SYNTHESIS GAS; DOPED CERIA; CATALYSTS; STABILITY; NIOBATES; OXIDE
abstract 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.
publisher ELSEVIER SCIENCE BV
issn 1566-7367
year published 2007
volume 8
issue 3
beginning page 335
ending page 339
digital object identifier (doi) 10.1016/j.catcom.2006.07.004
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000243163000024
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