Elucidation of cobalt disturbance on Ni/Al2O3 in dissociating hydrogen towards improved CO2 methanation and optimization by response surface methodology (RSM) |
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| Affiliation: | 1. School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;2. Centre of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;3. Environmental and Occupational Health Programme, School of Health Sciences, Health Campus, Universiti Sains Malaysia, 16150, Kubang Kerian, Kelantan, Malaysia;1. School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;2. Centre of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;3. Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;4. Department of Chemical Engineering, Abubakar Tafawa Balewa University, PMB 0248, Bauchi, Bauchi State, Nigeria;1. Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Malaysia;2. School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Johor, Malaysia;3. Centre of Hydrogen Energy, Institute of Future Energy, 81310 UTM, Johor Bahru, Johor, Malaysia;4. Faculty of Chemical and Process Engineering Technology, College of Engineering Technology, Universiti Malaysia Pahang, 26300, Gambang, Kuantan, Pahang, Malaysia;1. Sorbonne Université, UPMC Université Paris 06, CNRS-UMR 7197, Laboratoire de Réactivité de Surface, 4 Place Jussieu, Paris, France;2. University of Balamand, Faculty of Engineering, Department of Chemical Engineering, P.O. Box 33, Amioun El Koura, Lebanon;3. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal;1. Department of Chemical Engineering, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;2. Centre of Hydrogen Energy, Institute of Future Energy, 81310 UTM Johor Bahru, Johor, Malaysia;3. Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;1. Cambridge Centre for Advanced Research and Education in Singapore Ltd., 1 Create Way, CREATE Tower #05-05, Singapore, 138602, Singapore;2. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore;3. Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816, China;4. Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, United Kingdom;1. School of Material Science and Engineering, University of Jinan, Jinan, 250022, PR China;2. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China;3. Collaborative Innovation Center of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, 210044, Nanjing, China;4. Key Laboratory of Low Carbon Energy and Chemical Engineering, College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China;5. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, PR China |
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| Abstract: | In this study, nickel (Ni) and cobalt nickel (Co/Ni) supported on alumina were successfully synthesized by a facile electrolysis procedure and were tested for CO2 methanation. By applying the Ni/Al2O3 catalyst, CO2 conversion reached up to of 10 μmol/g.s, which is 1.4 times higher than Co/Ni/Al2O3, followed by the parent Al2O3. The addition of Co into Ni/Al2O3 has formed spinel phase in Co/Ni/Al2O3, as well as caused a slight increase in the basicity, which directed to the higher formation of formate species as observed by in-situ CO2 + H2 FTIR study. Both catalyst followed the dissociative mechanism during the CO2 methanation. However, bigger metal particles in Co/Ni/Al2O3 caused slower hydrogen dissociation compared to Ni/Al2O3, leading to lower yield of CH4. The optimization study via the response surface methodology (RSM) showed that the yield of CH4 was significantly affected by reaction temperature, followed by treatment time, the ratio of H2:CO2 and lastly the gas hour space velocity (GHSV). |
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| Keywords: | Nickel Cobalt Alumina Basic sites Optimization |
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