Effectiveness of Ni incorporation in iron oxide crystal structure towards thermochemical CO2 splitting reaction |
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| Affiliation: | 1. Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box- 2713, Doha, Qatar;2. Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, P.O. Box-2713, Doha, Qatar;3. Solar Technology Laboratory, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;4. Bioenergy and Catalysis Laboratory, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;1. Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland;1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, University of Naples Federico II Naples, 80125, Italy;2. Institute for Researches on Combustion-CNR, Naples 80125, Italy;1. School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin, 15001, China;2. Laboratory of Energetics and Applied Mechanics (LEMA), Polytechnic College of Abomey-Calavi, Abomey-Calavi University, Cotonou, 01BP 2009, Benin;3. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China;4. Laboratoire de Physique du Rayonnement (LPR), FAST-UAC, Cotonou, 01 BP 526, Benin;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing100049, China;3. Low Carbon Conversion Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;4. Center for Greenhouse Gas and Environmental Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China |
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| Abstract: | In this study, Ni-doped iron oxide (NixFe3?xO4) materials were synthesized via the 1,2-epoxypropane assisted sol-gel method by varying the molar concentration of Ni from x=0.2 to 1. Sol-gel derived NixFe3?xO4 gels were dried and the dried powder was further calcined upto 600 °C in air for 90 min. Obtained calcined NixFe3?xO4 powders were further analyzed to determine the phase composition, crystallite size, specific surface area, pore volume, and morphology via powder X-ray diffraction (PXRD), BET surface area analysis (BET), as well as scanning and transmission electron microscopy (SEM and TEM). The obtained results in the synthesis and characterization section indicate formation of NixFe3?xO4 nanoparticles with high specific surface area. Thermal reduction and re-oxidation of the sol-gel synthesized NixFe3?xO4 materials were determined by using the high temperature thermogravimetry. Obtained results indicate that the amount of O2 released during the thermal reduction step (at 1400 °C) and quantity of CO produced during the CO2 splitting step (at 1000 °C) increases as the concentration of Ni inside the iron oxide crystal structure increases. The highest amounts of O2 released (221.88 μmol/g) and CO produced (375.01 μmol/g) in case of NiFe2O4 (NF10 material). |
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| Keywords: | Ni-ferrite Solar energy Thermochemical cycles Sol-gel method |
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