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

Huber, Lea; Heindl, Melanie; Schlosser, Marc; Pfitzner, Arno; Dawoud, Belal

doi:10.3390/app13116408

Open AccessArticle

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

by

Lea Huber

^1,2,†

,

Melanie Heindl

^1,†

,

Marc Schlosser

²

,

Arno Pfitzner

²

and

Belal Dawoud

^1,*

¹

Laboratory of Sorption Processes, Faculty of Mechanical Engineering, East Bavarian Technical University of Applied Sciences Regensburg (OTH-Regensburg), Galgenbergstraße 30, 93053 Regensburg, Germany

²

Institute of Inorganic Chemistry, University Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany

^*

Author to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Appl. Sci. 2023, 13(11), 6408; https://doi.org/10.3390/app13116408

Submission received: 19 March 2023 / Revised: 14 May 2023 / Accepted: 21 May 2023 / Published: 24 May 2023

(This article belongs to the Special Issue Hydrogen Challenges: Production, Storage and Distribution)

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Abstract

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.

Keywords: hydrogen storage; redox reactions; iron/iron oxide; pelletizing process; cycle stability; water content

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MDPI and ACS Style

Huber, L.; Heindl, M.; Schlosser, M.; Pfitzner, A.; Dawoud, B. On the Cycle Stability and Macroscopic Structure of Iron Oxide Pellets for Thermochemical Hydrogen Storage: Influence of Water Content during the Pelletizing Process. Appl. Sci. 2023, 13, 6408. https://doi.org/10.3390/app13116408

AMA Style

Huber L, Heindl M, Schlosser M, Pfitzner A, Dawoud B. On the Cycle Stability and Macroscopic Structure of Iron Oxide Pellets for Thermochemical Hydrogen Storage: Influence of Water Content during the Pelletizing Process. Applied Sciences. 2023; 13(11):6408. https://doi.org/10.3390/app13116408

Chicago/Turabian Style

Huber, Lea, Melanie Heindl, Marc Schlosser, Arno Pfitzner, and Belal Dawoud. 2023. "On the Cycle Stability and Macroscopic Structure of Iron Oxide Pellets for Thermochemical Hydrogen Storage: Influence of Water Content during the Pelletizing Process" Applied Sciences 13, no. 11: 6408. https://doi.org/10.3390/app13116408

APA Style

Huber, L., Heindl, M., Schlosser, M., Pfitzner, A., & Dawoud, B. (2023). On the Cycle Stability and Macroscopic Structure of Iron Oxide Pellets for Thermochemical Hydrogen Storage: Influence of Water Content during the Pelletizing Process. Applied Sciences, 13(11), 6408. https://doi.org/10.3390/app13116408

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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

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