Kinetic and thermodynamic analyses of mid/low-temperature ammonia decomposition in solar-driven hydrogen permeation membrane reactor |
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| Affiliation: | 1. MOE Key Laboratory of Hydrodynamic Machinery Transients (Wuhan University), Ministry of Education, School of Power and Mechanical Engineering, Wuhan, Hubei 430072, PR China;2. State Key Laboratory of Power System, Department of Thermal Engineering, Tsinghua-BP Clean Energy Center, Tsinghua University, Beijing 100084, PR China;3. Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, Hubei 430079, PR China;1. HySA Infrastructure Centre of Competence, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;2. School of Chemical and Minerals Engineering, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;1. HySA Infrastructure Centre of Competence, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;2. School of Chemical and Minerals Engineering, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;1. Gifu University, Department of Chemistry and Biomolecular Science, Gifu, Japan;2. Sawafuji Electric Co., Ltd., Gunma, Japan |
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| Abstract: | It is a promising method for hydrogen generation without carbon emitting by ammonia decomposition in a catalytic palladium membrane reactor driven by solar energy, which could also store and convert solar energy into chemical energy. In this study, kinetic and thermodynamic analyses of mid/low-temperature solar thermochemical ammonia decomposition for hydrogen generation in membrane reactor are conducted. Hydrogen permeation membrane reactor can separate the product and shift the reaction equilibrium forward for high conversion rate in a single step. The variation of conversion rate and thermodynamic efficiency with different characteristic parameters, such as reaction temperature (100–300 °C), tube length, and separation pressure (0.01–0.25 bar), are studied and analyzed. A near-complete conversion of ammonia decomposition is theoretically researched. The first-law thermodynamic efficiency, net solar-to-fuel efficiency, and exergy efficiency can reach as high as 86.86%, 40.08%, and 72.07%, respectively. The results of this study show the feasibility of integrating ammonia decomposition for hydrogen generation with mid/low-temperature solar thermal technologies. |
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| Keywords: | Ammonia decomposition Hydrogen generation Membrane reactor Kinetic and thermodynamic study Mid/low-temperature thermal energy Solar thermochemistry |
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