New approach for particle size and shape analysis of iron-based oxygen carriers at multiple oxidation states (Open Access)--颗粒学报PARTICUOLOGY

Purnomo, V., Takehara, M. D. B., Faust, R., Ejjeta, L. A., & Leion, H. (2024). New approach for particle size and shape analysis of iron-based oxygen carriers at multiple oxidation states. Particuology, 90, 493-503. https://doi.org/10.1016/j.partic.2024.01.010

New approach for particle size and shape analysis of iron-based oxygen carriers at multiple oxidation states (Open Access)

Victor Purnomo ^a *, Marcelo Dal Belo Takehara^b, Robin Faust ^a, Lidiya Abdisa Ejjeta ^a, Henrik Leion^a

a Division of Energy and Materials, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg 412 58, Sweden
b Division of Energy Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå 971 87, Sweden

10.1016/j.partic.2024.01.010

Volume 90, July 2024, Pages 493-503

Received 23 December 2023, Revised 18 January 2024, Accepted 23 January 2024, Available online 1 February 2024, Version of Record 22 February 2024.

E-mail: purnomo@chalmers.se

Highlights

• Dynamic image analysis works well for evaluating size and shape of oxygen carriers.

• Oxidation state of oxygen carriers has minimum influence on particle size and shape.

• Exposure to operation in fluidized bed may alter particle size and shape.

Abstract

One of the crucial issues in the chemical looping technology lies in its bed material: the oxygen carrier. Particle size analysis of an oxygen carrier is important since in a fluidized bed the material can only work well within a specific size range. While the favorable size ranges for oxygen carrier materials have already been reported, none of the published studies has analyzed the particle size and shape of oxygen carriers in detail. Furthermore, the effect of oxygen carriers' oxidation degree on such properties has not been considered either. This study aimed to report the particle size and shape analysis of five iron-based oxygen carriers, one natural ore, one synthetic material, and three residue products, at different oxidation degrees using dynamic image analysis (DIA). The oxygen carriers were prepared at different mass conversion degrees in a fluidized bed batch reactor. The size distribution, sphericity, and aspect ratio of the oxygen carrier particles were examined experimentally using a Camsizer instrument. Our results show that the DIA method was successfully able to analyze the particle size and shape of our oxygen carriers with satisfying accuracy for comparison. The oxidation state of the investigated materials seems to only affect the particle size and shape of oxygen carriers to a minor extent. However, exposures to redox cycles in a fluidized bed reactor may alter the particle size and shape of most oxygen carriers.

Graphical abstract

Keywords

Oxygen carrier; Size and shape analysis; Dynamic image analysis; Oxidation state; Fluidized bed; Chemical looping

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