Hydrogen production over partial oxidation of methane using Ni Mg Al spinel catalysts: A kinetic approach
| Autor: | Akila Barama, Hassiba Messaoudi, Sébastien Thomas, Redouane Chebout, Samira Slyemi, Abdelhamid Djaidja, Siham Barama, Fouad Benaliouche |
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| Rok vydání: | 2017 |
| Předmět: |
Coprecipitation
General Chemical Engineering Spinel Inorganic chemistry 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Methane 0104 chemical sciences Catalysis Steam reforming chemistry.chemical_compound chemistry engineering Partial oxidation 0210 nano-technology Hydrogen production Syngas |
| Zdroj: | Comptes Rendus Chimie. 20:738-746 |
| ISSN: | 1631-0748 |
| DOI: | 10.1016/j.crci.2017.02.002 |
| Popis: | Ni Mg Al–based catalysts were synthesized by coprecipitation, sol–gel, and impregnation methods, calcined at 700 °C for 4 h and tested in partial oxidation of methane in a temperature range of 500–800 °C. The fresh and used unsupported and supported samples were characterized by X-ray diffraction, nitrogen physisorption with Brunauer-Emett-Teller (BET) analysis, and H 2 –temperature-programmed reduction. X-ray diffraction analysis showed, for all samples, the formation of spinel phases MgAl 2 O 4 and/or NiAl 2 O 4 with crystallite sizes of 6–14 nm. H 2 –temperature-programmed reduction analysis showed reduction of two Ni 2+ species (in octahedral and tetrahedral sites of a spinel structure) into metallic nickel known to be responsible for the methane activation. The 10 wt % Ni/MgAl 2 O 4 impregnated catalysts exhibited the highest activity and stability in the partial oxidation of methane reaction, which led mainly to syngas (CO + H 2 ) at 800 °C with a methane conversion close to the thermodynamic equilibrium (95%). A kinetic model revealed that the oxidation of methane occurs on a thin layer of the catalytic bed in which oxygen is consumed and is followed by the production of CO and H 2 by methane steam reforming and water gas shift reactions. |
| Databáze: | OpenAIRE |
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