Tailored hydrotalcite-based Mg-Ni-Al catalyst for hydrogen production via methane decomposition: Effect of nickel concentration and spinel-like structures |
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| Affiliation: | 1. Chemical Engineering Department, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia;2. Fundamental and Applied Sciences Department, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia;3. School of Chemical & Materials Engineering, National University of Sciences & Technology, H-12, Islamabad, Pakistan;4. Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan;1. Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran;2. Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, Iran;1. Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran;2. Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, Iran;3. Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;4. Laboratory of Advanced Catalysis for Sustainability, School of Chemistry, The University of Sydney, Sydney 2006, Australia;1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 11421, Riyadh, Saudi Arabia;2. Catalytic Processes and Materials, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands;1. PCeIM, Centro de Nanociencias y Nanotecnología–UNAM, CP. 22860 Ensenada, B.C., Mexico;2. Centro de Investigación y Desarrollo Tecnológico en Electroquímica, C.P. 76703 Querétaro, Mexico;3. Sección de Estudios de Posgrado e Investigación, UPIITA, Instituto Politécnico Nacional, Av. IPN 2580, 07340 Ciudad de México, Mexico;4. Lab. Catálisis y Materiales. IPN–ESIQIE, Edificio 8, tercer piso, Zacatenco 07738, Mexico;5. Centro de Nanociencias y Nanotecnología–UNAM, CP. 22860 Ensenada, B.C., Mexico;1. Chemical Engineering Department, Yildiz Technical University, Davutpasa Campus, Topkapi, 34210, Istanbul, Turkey;2. Department of Energy Science and Technology, Turkish-German University, Beykoz, 34820, Istanbul, Turkey;1. KAUST Catalysis Center, 4700 King Abdullah University of Science & Technology, Thuwal 23955-6900, Saudi Arabia;2. BM30B/FAME beamline, ESRF, F-38043 Grenoble cedex 9, France;3. Institut Néel, UPR 2940 CNRS, F-38042 Grenoble cedex 9, France;4. Core Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;5. Paris Saclay Research Center, Materials Sciences, AIR LIQUIDE Research & Development, France |
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| Abstract: | Thrive for the COx-free hydrogen production via methane decomposition has gained much interest owing to its feasibility and environmental friendliness. Herein, ahydrotalcite based Nickel catalyst was synthesized via co-precipitation method by varying the amount of Nickel concentration and tested for methane decomposition reaction in a fixed bed reactor. In addition, the effect of calcination temperature in the development of the spinel-like structure of as-developed catalyst was comprehensively discussed. It was found that the hydrotalcite based Nickel catalyst prepared at 40% Nickel concentration has the highest performance of above 80% conversion for 7 h of methane decomposition which was owing to its effective diffusion of carbon particles and its spinel-like structure, evidently from the XRD and FESEM analysis. The profound performance monitored here was attributed to the formation of carbon nanofibers (CNFs) on the surface of the catalyst which levitates the active Niospecies on its tips, results in more available active sites for the chemisorptions of the methane molecules. Nevertheless, the excessive of Nickel concentration leads to the detrimental methane decomposition performance, hencepromotes the formation of large particle size and successive development of bulk NiO phases during the reduction process, consequently abnegate the overall methane decomposition reaction. The aforementionedfindingsshow that the spinel-like structure is the key factor in the growth of long uniform CNFs and elevation of active sites on the fibre tips. |
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| Keywords: | Hydrotalcite Methane decomposition Hydrogen Spinel structure Nickel |
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