Technologien zur Speicherung von Wasserstoff. Teil 2: Irreversible Konversion und Technologievergleich

Müller, Karsten

doi:10.1002/cite.201800044

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Such an MOF may exhibit a theoretical ESD of up to 3.0 kWh/(L MOF) [9]. Up to now, no system can be tested at a demonstration scale, as the technology is still in the laboratory stage [27].…”

Section: Introductionmentioning

confidence: 99%

“…One of the main challenges in the storage process via the steam iron process is to develop an iron oxide mixture that is capable of sustaining long-term thermal and reactive cycling processes between 700°C and 900°C. On the other hand, the redox storage of H 2 could offer high storage performance due to the strong binding of hydrogen and the high ESD [26,27]. Furthermore, hydrogen is not stored directly, which provides a considerable safety advantage against, e.g., hydrogen compression storage.…”

Section: Introductionmentioning

confidence: 99%

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On the Development of Thermochemical Hydrogen Storage: An Experimental Study of the Kinetics of the Redox Reactions under Different Operating Conditions

2021

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This work aims at investigating the reduction/oxidation (redox) reaction kinetics on iron oxide pellets under different operating conditions of thermochemical hydrogen storage. In order to reduce the iron oxide pellets (90% Fe2O3, 10% stabilizing cement), hydrogen (H2) is applied in different concentrations with nitrogen (N2), as a carrier gas, at temperatures between between 700∘C and 900∘C, thus simulating the charging phase. The discharge phase is triggered by the flow of a mixture out of steam (H2O) and N2 at different concentrations in the same temperature range, resulting in the oxidizing of the previously reduced pellets. All investigations were carried out in a thermo-gravimetric analyzer (TGA) with a flow rate of 250mL/min. To describe the obtained kinetic results, a simplified analytical model, based on the linear driving force model, was developed. The investigated iron oxide pellets showed a stable redox performance of 23.8% weight reduction/gain, which corresponds to a volumetric storage density of 2.8kWh/(Lbulk), also after the 29 performed redox cycles. Recalling that there is no H2 stored during the storage phase but iron, the introduced hydrogen storage technology is deemed very promising for applications in urban areas as day-night or seasonal storage for green hydrogen.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Development of Thermochemical Hydrogen Storage: An Experimental Study of the Kinetics of the Redox Reactions under Different Operating Conditions

2021

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Metal hydrides for hydrogen storage – Identification and evaluation of stationary and transportation applications

Drawer,

Lange,

Kaltschmitt

2024

Journal of Energy Storage

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On the Kinetic Mechanisms of the Reduction and Oxidation Reactions of Iron Oxide/Iron Pellets for a Hydrogen Storage Process

et al. 2022

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This work aims at investigating the kinetic mechanisms of the reduction/oxidation (redox) reactions of iron oxide/iron pellets under different operating conditions. The reaction principle is the basis of a thermochemical hydrogen storage system. To simulate the charging phase, a single pellet consisting of iron oxide (90% Fe2O3, 10% stabilising cement) is reduced with different hydrogen (H2) concentrations at temperatures between 600 and 800∘C. The discharge phase is initiated by the oxidation of the previously reduced pellet by water vapour (H2O) at different concentrations in the same temperature range. In both reactions, nitrogen (N2) is used as a carrier gas. The redox reactions have been experimentally measured in a thermogravimetric analyser (TGA) at a flow rate of 250mL/min. An extensive literature review has been conducted on the existing reactions’ kinetic mechanisms along with their applicability to describe the obtained results. It turned out that the measured kinetic results can be excellently described with the so-called shrinking core model. Using the geometrical contracting sphere reaction mechanism model, the concentration- and temperature-dependent reduction and oxidation rates can be reproduced with a maximum deviation of less than 5%. In contrast to the reduction process, the temperature has a smaller effect on the oxidation reaction kinetics, which is attributed to 71% less activation energy (Ea,Re=56.9kJ/mol versus Ea,Ox=16.0kJ/mol). The concentration of the reacting gas showed, however, an opposite trend: namely, to have an almost twofold impact on the oxidation reaction rate constant compared to the reduction rate constant.

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Technologien zur Speicherung von Wasserstoff. Teil 2: Irreversible Konversion und Technologievergleich

Cited by 3 publications

References 21 publications

On the Development of Thermochemical Hydrogen Storage: An Experimental Study of the Kinetics of the Redox Reactions under Different Operating Conditions

On the Development of Thermochemical Hydrogen Storage: An Experimental Study of the Kinetics of the Redox Reactions under Different Operating Conditions

Metal hydrides for hydrogen storage – Identification and evaluation of stationary and transportation applications

On the Kinetic Mechanisms of the Reduction and Oxidation Reactions of Iron Oxide/Iron Pellets for a Hydrogen Storage Process

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