Study of LaxNiOy and LaxNiOy/MgAl2O4 catalysts in dry reforming of methane
| Autor: | Abdelhamid Djaidja, Sébastien Thomas, Akila Barama, Hassiba Messaoudi, Samira Slyemi |
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| Rok vydání: | 2018 |
| Předmět: |
Reaction mechanism
Materials science Carbon dioxide reforming Process Chemistry and Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Water-gas shift reaction Methane 0104 chemical sciences Catalysis Steam reforming chemistry.chemical_compound Nickel chemistry Chemical engineering Chemical Engineering (miscellaneous) 0210 nano-technology Dispersion (chemistry) Waste Management and Disposal |
| Zdroj: | Journal of CO2 Utilization. 24:40-49 |
| ISSN: | 2212-9820 |
| DOI: | 10.1016/j.jcou.2017.12.002 |
| Popis: | Bulk LaxNiOy and supported LaxNiOy/MgAl2O4 (with x = 1 or 2 and y = 3 or 4) catalysts have been prepared respectively by sol-gel and impregnation methods The elaborated materials have been characterized by XRD, BET, H2-TPR, H2-chemisorption and TPO. The catalytic activity was evaluated in dry reforming of methane (DMR) with an equimolar ratio of CH4 and CO2. XRD analysis shows the presence of LaNiO3, La2NiO4 and MgAl2O4 phases. Higher specific surface areas and nickel dispersions were obtained for the supported catalysts. H2-TPR analysis revealed a low reducibility of the nickel in the supported solids. Supported catalysts were found more active and stable than bulk one in DMR in good agreement with higher Ni dispersion and the beneficial role of the basic support. The XRD analysis performed on the spent catalysts (after 65 h of catalytic test) revealed the presence of the initial phases with metallic nickel species. The TPO analysis showed a low carbon deposition for the supported catalysts. A kinetic study based on the reaction mechanism points out the participation of the reverse water gas shift reaction (RWGS) for the conversion of CO2 and of the produced H2 as well as contribution of steam methane reforming reaction for the conversion of CH4, with water produced from (RWGS), for temperatures over 1023 K. |
| Databáze: | OpenAIRE |
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