Stable NiO–CeO2 nanoparticles with improved carbon resistance for methane dry reforming
| Autor: | Esther Bailón-García, Patrick Da Costa, Andrea Cárdenas-Arenas, Agustín Bueno-López, Dolores Lozano-Castelló |
|---|---|
| Přispěvatelé: | Universidad de Alicante. Departamento de Química Inorgánica, Universidad de Alicante. Instituto Universitario de Materiales, Materiales Carbonosos y Medio Ambiente |
| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_element
Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Methane Catalysis chemistry.chemical_compound Ceria Nickel Geochemistry and Petrology Rare earths Química Inorgánica Methane reformer Carbon dioxide reforming General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Cerium chemistry Chemical engineering Methane dry reforming Mixed oxide 0210 nano-technology Carbon |
| Zdroj: | Journal of Rare Earths. 40:57-62 |
| ISSN: | 1002-0721 |
| DOI: | 10.1016/j.jre.2020.11.020 |
| Popis: | High surface area mixed oxide 8.7% NiO-CeO2 nanoparticles (122 m2/g; 6–7 nm) were prepared using a reversed microemulsion method, and were tested for dry methane reforming (DRM). The catalytic activity of these nanoparticles remains stable under the severe conditions of DRM (700 °C), and they show better carbon resistance than conventional NiO-CeO2 catalysts prepared without control of the size. The activity and selectivity of nanoparticles and reference catalyst are similar, but nanoparticles reduce by 63% the accumulation of carbon during the DRM tests, which is a key feature for this reaction. XPS and H2-TPR suggest that the improved carbon resistance of the nanoparticles is the better interaction and cooperation between NiO and CeO2 mixed phases. In nanoparticles, the participation of cerium cations in the redox processes taking place during DRM stabilize cationic species of nickel. On the contrary, the catalyst prepared without control of the size suffered segregation of Ni during DRM reaction, and segregated Ni explains the higher catalytic formation of carbon. Project supported by the Generalitat Valenciana (Project PROMETEO/2018/076; ACA GRISOLIAP/2017/185; EBG APOSTD/2019/030), MINECO (CTQ2015-67597-C2-2-R), MICINN (PID2019-105960RB-C22) and European Union FEDER funds. |
| Databáze: | OpenAIRE |
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