Chemical Hydrogen Storage
The “Chemical Hydrogen Storage” research department of HI ERN targets new chemical hydrogen storage technologies, related catalytic processes and material technologies.
Examples are the modification of electrocatalysts with ionic liquids or hydrogen storage using Liquid Organic Hydrogen Carrier (LOHC) systems. The LOHC technologies allow large amounts of hydrogen with high volumetric energy density for infrastructure-compatible storage and transport of hydrogen. The research unit is led by Prof. Dr. Peter Wasserscheid. The research at HI ERN naturally extents existing research activities of his FAU group, for example towards direct LOHC fuel cell and electrolysis technologies.
The Scheme shows reversible hydrogen binding/release using these pure hydrocarbon LOHC compounds. During hydrogenation, H0-DBT is loaded with up to 6.2 wt% hydroge corresponding to an energy content of 2.05 kWh kg-1. The energy-rich molecule H18-DBT is a high boiling liquid that can be stored in typical fuel tank for a long time without loss in energy. Molecular hydrogen can be released from H18-DBT by contact with a suitable catalyst at elevated temperature.
Full Cell Setup
For the investigation of fuel cells operated with organic fuels, a fuel cell setup is installed for testing various membrane electrode assemblies (MEAs). With this setup, it is possible to operate a single fuel cell with pressurized air (dry or humidified), hydrogen (dry or humidified) and different liquid, organic fuels. These fuels can be delivered liquid, gaseous or with a (humidified) carrier gas (nitrogen) to the cell. The quickConnect-setup also enables a fast switching between different MEAs, to vary between various membranes, catalyst loading or gas diffusion layers.
Kinetic modeling of the hydrogen release from Perhydro-Dibenzyltoluene
The overall optimization of the catalytic hydrogen release from the LOHC perhydro-dibenzyltoluene requires precise knowledge of the reaction system.
In order to describe the reaction progress mathematically, kinetic measurements are performed in a tubular reactor at lab-scale. For the estimation of kinetic parameters from experimental data, methods of linear and non-linear regression may be applied. The finally resulting parameterized model is a useful tool, e.g. in order to simulate dynamic operation of the dehydrogenation reactor or the effect of process parameters (e.g. temperature, pressure, residence time) on reactor performance.
- Dr. Peter Pfeiffer, Prof. Roland Dittmeyer (KIT, Germany)
- Prof. Regina Palkovits, Prof. Walter Leitner (RWTH Aachen)
LOHC OneReactor system (5 KW hydrogenation / 5 kW dehydrogenation power)
The HI ERN research unit of Prof. Wasserscheid has jointly developed with the FAU spin-off company Hydrogenious Technologies GmbH the world’s first fully operational LOHC OneReactor energy storage system. The system has been built by Hydrogenious Technologies and has been delivered in 12/2016 to HI ERN. The system realizes hydrogen storage and release in the same reactor, thus improving significantly heat management and system dynamics of the entire energy storage process and reducing greatly specific investment cost.
In our current research using this OneReactor system at HI ERN we develop and test optimized catalyst systems for LOHC hydrogenation/dehydrogenation with a maximum of volumetric productivity and a minimum of LOHC degradation. Moreover, we identify and evaluate the most efficient operational strategies for the OneReactor in two different application scenarios: a) Off-grid energy storage, and b) energy storage in interplay with different heat storage technologies. Here, we investigate to which extent the heat from the exothermic hydrogen-loading process can be used for the endothermic hydrogen-release process in stationary applications if appropriate heat storage systems are applied.
- High-pressure high-temperature batch autoclave for LOHC hydrogenation / dehydrogenation experiments
- Laboratory plant for continuous dehydrogenation experiments e.g. catalyst screening and kinetic measurements
- Fuel cell setup for testing different organic substances as fuels
Analysis of gaseous substances:
- Gas chromatography for trace analysis of carbon monoxide, carbon dioxide, low boiling aromatic compounds and hydrocarbons in hydrogen
- On-line FTIR spectroscopy for hydrogen purity analysis
Analysis of liquid substances:
- Gas chromatography for stability studies of organic hydrogen carrier substances
Strategies for Low-Temperature Liquid Organic Hydrogen Carrier Dehydrogenation
Energy & fuels 35(13), 10929 - 10936 (2021) [10.1021/acs.energyfuels.1c01170] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Impact of catalyst loading, ionomer content, and carbon support on the performance of direct isopropanol fuel cells
Journal of power sources advances 10, 100064 - (2021) [10.1016/j.powera.2021.100064] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Model Studies on the Ozone‐Mediated Synthesis of Cobalt Oxide Nanoparticles from Dicobalt Octacarbonyl in Ionic Liquids
ChemistryOpen 10(2), 141-152 (2021) [10.1002/open.202000187] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Thermophysical properties of diphenylmethane and dicyclohexylmethane as a reference liquid organic hydrogen carrier system from experiments and molecular simulations
International journal of hydrogen energy 45(53), 28903 - 28919 (2020) [10.1016/j.ijhydene.2020.07.261] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Stable and Selective Dehydrogenation of Methylcyclohexane using Supported Catalytically Active Liquid Metal Solutions – Ga 52 Pt/SiO 2 SCALMS
ChemCatChem 12(18), 4533 - 4537 (2020) [10.1002/cctc.202000671] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Surface Tension and Viscosity of Binary Mixtures of the Fluorinated and Non-fluorinated Ionic Liquids [PFBMIm][PF6] and [C4C1Im][PF6] by the Pendant Drop Method and Surface Light Scattering
International journal of thermophysics 41(10), 144 (2020) [10.1007/s10765-020-02720-w] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Periodic Open Cellular Raney‐Copper Catalysts Fabricated via Selective Electron Beam Melting
Advanced engineering materials 22(5), 1901524 - (2020) [10.1002/adem.201901524] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Influence of Carboxylate Anions on Phase Behavior of Choline Ionic Liquid Mixtures
Molecules 25(7), 1691 - (2020) [10.3390/molecules25071691] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
Coke Formation during Propane Dehydrogenation over Ga−Rh Supported Catalytically Active Liquid Metal Solutions
ChemCatChem 12(4), 1085 - 1094 (2020) [10.1002/cctc.201901922] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS
High Performance Direct Organic Fuel Cell Using the Acetone/Isopropanol Liquid Organic Hydrogen Carrier System
Electrochemistry communications 118, 106786 - (2020) [10.1016/j.elecom.2020.106786] Files Fulltext by OpenAccess repository BibTeX | EndNote: XML, Text | RIS