Methane oxidation by lattice oxygen of CeNbO4+δ |
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| Affiliation: | 1. Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;2. Boreskov Institute of Catalysis SB RAS, 5 pr. Akademika Lavrentieva, Novosibirsk 630090, Russia;1. Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, PR China;2. Department of Chemistry, Shanghai University, Shanghai 200444, PR China;1. Institute of Hematology and Medical Oncology L.A. Seragnoli, University of Bologna, Bologna, Italy;2. Unit of Nuclear Medicine, Sant''Orsola-Malpighi Hospital, Bologna, Italy |
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| Abstract: | The reactivity of methane with lattice oxygen of cerium niobate, CeNbO4+δ, 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 H2 on the cerium niobate surface. At 1073 K when δ → 0, the reaction of methane with CeNbO4+δ selectively yields synthesis gas with H2/CO ratio close to two. |
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