Study of the reactivity of Double-perovskite type oxide La1−xMxNiO4 (M = Ca or Sr) for chemical looping hydrogen production
| Autor: | Gustavo Torres Moure, Juan A. C. Ruiz, Marcus Antônio de Freitas Melo, Dulce Maria de Araújo Melo, Heloísa P. Macedo, V. R. M. Melo, RA Medeiros, Renata Martins Braga |
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| Rok vydání: | 2018 |
| Předmět: |
Dopant
Renewable Energy Sustainability and the Environment 05 social sciences Doping Inorganic chemistry Oxide Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Redox law.invention chemistry.chemical_compound Crystallinity Fuel Technology chemistry law 0502 economics and business Reactivity (chemistry) Calcination 050207 economics 0210 nano-technology Perovskite (structure) |
| Zdroj: | International Journal of Hydrogen Energy. 43:1406-1414 |
| ISSN: | 0360-3199 |
| Popis: | La2-xMxNiO4 perovskite oxygen carriers (OC) doped with Ca and Sr (x = 0.05 and 0.20) in the site La were prepared by microwave assisted combustion method and calcined at 800 °C for 2 h. A reactivity study was carried out applying pulses of H2, O2 and CH4. The reactions involved in each step, as well as H2 production, were studied to evaluate the redox properties of each OC. The crystalline structure, morphology, reduction and oxidation profiles were determined by XRD, SEM and TPR/TPO cycles, respectively. The results indicate that the dopant (Ca or Sr) strongly affect the structure and reactivity of the OC. The increase in dopant concentration increased the degree of crystallinity and the amount of the A2BO4 phase formed. The increase in dopant concentration decreased the reducibility of the perovskite. OCs doped with Ca showed higher conversion percentages, and also higher H2 production. In carriers doped with Sr no coke formation was observed. |
| Databáze: | OpenAIRE |
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