Mechanism of CH4 dry reforming by pulse microcalorimetry: Metal nanoparticles on perovskite/fluorite supports with high oxygen mobility
| Autor: | Galina Alikina, Vladimir A. Rogov, Eugenia N. Ermakova, Natalia Sazonova, Claude Mirodatos, Natalia Mezentseva, Yves Schuurman, Dmitry Arendarsky, Vladislav A. Sadykov, Aleksei Bobin, Svetlana Pavlova |
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| Přispěvatelé: | INGENIERIE (INGENIERIE), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Isothermal microcalorimetry
Carbon dioxide reforming Inorganic chemistry Oxide 02 engineering and technology [CHIM.CATA]Chemical Sciences/Catalysis 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences [SDE.ES]Environmental Sciences/Environmental and Society Dissociation (chemistry) 0104 chemical sciences Catalysis Metal chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry 0210 nano-technology Instrumentation Perovskite (structure) Syngas |
| Zdroj: | Thermochimica Acta Thermochimica Acta, Elsevier, 2013, 567, pp.27-34. ⟨10.1016/j.tca.2013.01.034⟩ |
| ISSN: | 0040-6031 |
| DOI: | 10.1016/j.tca.2013.01.034 |
| Popis: | INGENIERIE+ABB:YSC:CMI; The mechanism of CH4 dry reforming on Pt, Ru, Ni, Ni + Ru-supported perovskite (PrFeOx, LaPrMnCrOx) or fluorite (LnCeZrO(x)) oxides was studied using a Setaram Sensys DSC TG calorimeter and a pulse kinetic installation. For catalysts in the steady-state, CH4 and CO2 transformation in separate pulses proceeds with the rate and products selectivity equal to that in mixed CO2 + CH4 pulses. Heat effects of separate stages correspond to CH4 oxidation into syngas by strongly bound bridging oxygen forms of support (heat of adsorption up to 650 kJ mol(-1) O-2 for fluorites and similar to 500 kJ mol(-1) O-2 for perovskites) and their replenishment by CO2 dissociation, respectively. These features demonstrate a step-wise red-ox (Marsvan-Crevelen) mechanism of CH4 dry reforming. Fast oxygen transfer from the sites of oxide support to the metal/oxide interface provides required conjugation of stages. (C) 2013 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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