Ammonia decomposition kinetics over LiOH-promoted, α-Al2O3-supported Ru catalyst |
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| Affiliation: | 1. Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul, South Korea;2. Clean Energy and Chemical Engineering, Korea University of Science and Technology, South Korea;3. Department of Chemical and Biological Engineering, Korea University, Seoul, South Korea;4. Department of Converging Science and Technology, KHU-KIST Graduate School, Kyunghee University, Seoul, South Korea;5. Rare Isotope Accelerator Promotion Team, Ministry of Science, ICT and Future Planning, Gwacheon-si, South Korea;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. IET Institute for Energy Technology, HSR University of Applied Sciences, PO Box 1475, Rapperswil-Jona, 8640, Switzerland;2. HySA Infrastructure Centre of Competence, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;3. School of Chemical and Minerals Engineering, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa |
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| Abstract: | A LiOH-promoted Ru-based catalyst was recently reported to have a high TOF of 17.7 s−1 at 623 K, compared to 2.7 s−1 for an un-promoted Ru-based catalyst, and has been reproduced for this study to develop further understanding of the catalyst activity under a range of conditions. The kinetic values were calculated using a Temkin-Pyzhev-like power law rate expression model. Reaction orders, pre-exponential factors (A) and activation energies (E) were calculated for two temperature ranges, 623–748 K, and 748–873 K. The TOF of this catalyst at 623 K is not similar to that previously reported, being only 1.6 s−1 in this study. A follow-up CFD analysis supports the fact that the kinetic model effectively describes performance of the catalyst at a range of temperatures and pressures, and can be used in the future on similar catalysts. H2 partial pressure has an inhibitory effect on the rate of decomposition of NH3 at all temperatures, not just near or below 673 K as previously proposed in the literature, however equilibrium decomposition is still possible with sufficient catalyst loading. |
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| Keywords: | Kinetics Ru-based catalyst Ammonia decomposition Hydrogen storage CFD |
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