Benzyltoluene/dibenzyltoluene-based mixtures as suitable liquid organic hydrogen carrier systems for low temperature applications |
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| Affiliation: | 1. Forschungszentrum Jülich, Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK 11), Egerlandstr. 3, 91058, Erlangen, Germany;2. Lehrstuhl für Chemische Reaktionstechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany;1. HySA Infrastructure Centre of Competence, North-West University, Faculty of Engineering, Private Bag X6001, Potchefstroom Campus, 2520, South Africa;2. Mintek, 200 Malibongwe Drive, Private Bag X3015, Randburg, 2125, South Africa;1. Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany;2. Lehrstuhl für Chemische Reaktionstechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany;3. Erlangen Catalysis Resource Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany;1. Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, PR China;2. Department of Chemical & Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3, Canada;1. School of Mechanical Engineering, Kookmin University, Seoul, Republic of Korea;2. Department of Mechanical Engineering, Gachon University, Seongnam, Republic of Korea;3. School of Mechanical Engineering, Sungkyunkwan University, Suwon, Republic of Korea;1. Fraunhofer Institute for Integrated Systems and Device Technology IISB, Schottkystrasse 10, 91058, Erlangen, Germany;2. Forschungszentrum Jülich, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK 11), Egerlandstr. 3, 91058, Erlangen, Germany;3. Chair of Electron Devices (LEB), Friedrich-Alexander University Erlangen-Nürnberg (FAU), Cauerstrasse 6, 91058, Erlangen, Germany;4. Institute of Chemical Reaction Engineering (CRT), Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058, Erlangen, Germany |
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| Abstract: | In this contribution we propose mixtures of the two LOHC systems benzyltoluene (H0-BT)/perhydro benzyltoluene (H12-BT) and dibenzyltoluene (H0-DBT)/perhydro dibenzyltoluene (H18-DBT) as promising hydrogen storage media for technical applications at temperatures below ambient. The mixing of the two LOHC systems provides the advantage of a reduced viscosity of the hydrogen-rich system, for example a 20 wt% addition of H12-BT to H18-DBT reduces the viscosity at 10 °C by 80%. Interestingly, it is also found that the dehydrogenation of such mixture provides a hydrogen release productivity that is 12–16% higher compared to pure H18-DBT dehydrogenation under otherwise identical conditions. This enhanced rate is attributed to a combination of reduced hydrogen partial pressure in the reactor (due to the higher H12-BT vapor pressure), preferred H12-BT dehydrogenation (due to faster H12-BT diffusion) and effective transfer hydrogenation between the two LOHC systems. |
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| Keywords: | Hydrogen storage Dibenzyltoluene Benzyltoluene LOHC systems Hydrogenation Dehydrogenation |
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