Two-dimensional Mo2C: An efficient promoter for hydrogen storage and release from a liquid organic hydrogen carrier |
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| Affiliation: | 1. Chemical and Biological Engineering Department, University of British Columbia, Vancouver, Canada;2. Chemical Engineering Department, Technical University of Munich, Munich, Germany;1. Chemical-Technological Department, Samara State Technical University, 443100 Samara, Russia;2. Department of Physics, Tver State Medical University, 170100 Tver, Russia;3. Department of Physical Chemistry, Kazan Federal University, 420008 Kazan, Russia;4. Competence Centre CALOR of Faculty of Interdisciplinary Research at University of Rostock, 18059 Rostock, Germany;1. Chemical-Technological Department, Samara State Technical University, 443100 Samara, Russia;2. Department of Physics, Tver State Medical University, 170100 Tver, Russia;3. Institute of Technical Thermodynamics, University of Rostock, Albert-Einstein Str. 2, 18059 Rostock, Germany;4. Competence Centre CALOR at the Department Life, Light & Matter of the Interdisciplinary Faculty, University of Rostock, 18059 Rostock, Germany;5. Department of Physical Chemistry, Kazan Federal University, 420008 Kazan, Russia;1. Department of Chemical Engineering, Shaanxi Key Laboratory of Energy Chemical Process Intensification, Engineering Research Center of New Energy System Engineering and Equipment, Xi''an Jiaotong University, Xi''an, 710049, China;2. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan, 030000, China;1. Laboratorio de Química Teórica y Computacional, Departamento de Química, Facultad Experimental de Ciencias, Universidad Del Zulia, Maracaibo, Venezuela;2. Programa de Química, Facultad de Ciencias Básicas, Universidad Del Atlántico, Barranquilla, Colombia;3. Laboratorio de Óptica y Procesamiento de Imágenes, Facultad de Ciencias Básicas, Universidad Tecnológica de Bolívar, Turbaco, Colombia;4. Laboratorio de Química Inorgánica, Departamento de Química, Facultad Experimental de Ciencias, Universidad Del Zulia, Maracaibo, Venezuela;1. Department of Chemical Engineering, Shaanxi Key Laboratory of Energy Chemical Process Intensification, Engineering Research Center of New Energy System Engineering and Equipment, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030000, China |
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| Abstract: | Two-dimensional Mo2C (2D-Mo2C) is reported for the first time as an effective promoter of a Pt/Al2O3 catalyst for both the hydrogenation and dehydrogenation of the liquid organic hydrogen carrier (LOHC) pair, dibenzyltoluene (DBT) and perhydro-dibenzyltoluene (H18-DBT), respectively. Addition of 6.2 wt% 2D-Mo2C to a Pt/Al2O3 catalyst resulted in a significant increase in both the degree of hydrogenation and dehydrogenation compared to the unpromoted catalyst. An analysis of the initial (120 min) perhydro-DBT dehydrogenation kinetics in the temperature range of 270–330 °C, resulted in a reduction in apparent activation energy from 119.5 ± 3.8 kJ/mol for the Pt/Al2O3 catalyst to 110.4 ± 5.6 kJ/mol for the 6.2 wt% 2D-Mo2C/Pt/Al2O3 catalyst. The 6.2 wt% 2D-Mo2C/Pt/Al2O3 catalyst was also more stable than the unpromoted catalyst over several consecutive cycles of hydrogenation and dehydrogenation. Catalyst characterization showed that addition of 2D-Mo2C resulted in an increase in particle size and electron density of the Pt, which enhanced both the hydrogenation and dehydrogenation reactions, despite the fact that the 2D-Mo2C alone was inactive for both reactions. |
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| Keywords: | Dibenzyltoluene Hydrogenation Dehydrogenation Two-dimensional nanomaterials Molybdenum carbide Liquid organic hydrogen carriers |
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