Microwave thermal pre-treatment and calcination of biomineralised sorbents for calcium looping

Erans, María; Durán-Jimenez, Gabriela; Rodríguez, José M.; Stevens, Lee; Dodds, Chris

Abstract

Waste eggshells have been investigated as biomineralised CO2 sorbents for the calcium looping cycle due to their high Ca content, low cost, availability, and high CO2 uptake. This work investigates a novel heat-pre-treatment using eggshells as raw material. The eggshells were simultaneously calcined and thermally pre-treated via microwave heating using different powers and times whilst maintaining the same input energy in a single mode cavity reactor. The calcined eggshells were characterised using standard characterisation techniques such as TGA and isotherms of N2 adsorption at 77 K. The dielectric properties were measured using the cavity perturbation technique at 2.45 GHz. Numerical electromagnetic simulations were performed using COMSOL Multiphysics and results were used to optimise the experimental setup. The treated materials were subjected to carbonation/calcination cycles in order to assess their suitability as a calcium-looping sorbent. The sorbent that exhibited a more stable CO2 uptake was the one treated at the highest power (800 W) 4.5 mmol CO2/g sorbent after 20 cycles under mild calcination conditions. Adsorbents prepared at 400, 600 and 800 W displayed similar CO2 uptake after 20 cycles when the calcination conditions were under more realistic conditions.

Citation

Erans, M., Durán-Jimenez, G., Rodríguez, J. M., Stevens, L., & Dodds, C. (2024). Microwave thermal pre-treatment and calcination of biomineralised sorbents for calcium looping. Journal of Co2 Utilization, 83, Article 102794. https://doi.org/10.1016/j.jcou.2024.102794

• Journal Article Type: Article
• Acceptance Date: Apr 26, 2024
• Online Publication Date: May 3, 2024
• Publication Date: 2024-05
• Deposit Date: May 15, 2024
• Publicly Available Date: May 15, 2024
• Journal: Journal of CO2 Utilization
• Electronic ISSN: 2212-9820
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 83
• Article Number: 102794
• DOI: https://doi.org/10.1016/j.jcou.2024.102794
• Keywords: CO2 capture; Eggshell; Calcium looping; Microwave heating; Thermal pretreatment
• Public URL: https://nottingham-repository.worktribe.com/output/34634508
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S221298202400129X
• Additional Information: This article is maintained by: Elsevier; Article Title: Microwave thermal pre-treatment and calcination of biomineralised sorbents for calcium looping; Journal Title: Journal of CO2 Utilization; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jcou.2024.102794; Content Type: article; Copyright: © 2024 The Authors. Published by Elsevier Ltd.