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On the Cycle Stability and Macroscopic Structure of Iron Oxide Pellets for Thermochemical Hydrogen Storage: Influence of Water Content during the Pelletizing Process

  • Hydrogen storage based on the repeated reduction and oxidation (redox) reactions of iron oxide/iron composites represents a promising technology. This work is dedicated to studying the influence of the amount of water added during the pelletizing process on the cycle stability and structure of iron oxide pellets. The storage composites were prepared from iron oxide (Fe2O3) and 10 wt.-% support material (cement) with different amounts of water (18 and 33 wt.-%) in a laboratory-scale pelletizing disk. To evaluate the cycle stability of the composites, the kinetics of the redox reactions were experimentally measured at 800 ∘ C in an atmosphere of 50% N2 and 50% H2 (reduction) or 50% steam (oxidation), respectively. Moreover, the structure of the pellets was analyzed by micro-computed tomography scans. It turned out that pellets with higher water contents attained faster kinetics and a higher cycle stability. The sample with the least water content (18 wt.-%) needed about 26 min and 19 min to reach a conversion rate of 80% during the reduction and oxidation reactions of the sixth redox cycle, respectively. In contrast, the sample with the highest water content (33 wt.-%) could achieve the same conversion rate after 18 min (reduction) and 13 min (oxidation) during the ninth redox cycle.

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Metadaten
Author:Lea HuberORCiD, Melanie HeindlORCiD, Marc SchlosserORCiD, Arno PfitznerORCiD, Belal DawoudORCiDGND
DOI:https://doi.org/10.3390/app13116408
Parent Title (English):Applied Sciences
Publisher:MDPI
Place of publication:16
Document Type:Article
Language:English
Year of first Publication:2023
Release Date:2023/07/14
Tag:cycle stability; hydrogen storage; iron/iron oxide; pelletizing process; redox reactions; water content
Volume:13
Issue:11
Article Number:6408
Note:
Corresponding author: Belal Dawoud
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Heizungs- und Klimatechnik
Fakultät Maschinenbau / Labor Sorptionsprozesse
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
Corresponding author der OTH Regensburg
research focus:Energie und Mobilität
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International