A study of the mechanisms associated with CO2 utilisation via the reverse Boudouard reaction

Alsawadi, Ahmed ORCID: https://orcid.org/0009-0006-1770-5287, Marsh, Richard ORCID: https://orcid.org/0000-0003-2110-5744, Steer, Julian ORCID: https://orcid.org/0000-0002-3003-4768 and Morgan, David ORCID: https://orcid.org/0000-0002-6571-5731 2025. A study of the mechanisms associated with CO2 utilisation via the reverse Boudouard reaction. Fuel 381 (Part C) , 133448. 10.1016/j.fuel.2024.133448

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Abstract

The main purpose of this work was to investigate the critical mechanisms affecting char reactivity in CO2 gasification. This research investigated the influence of physical and chemical properties of biochar, hydrochar and coal char samples during CO2 gasification using a variety of laboratory techniques to measure properties including mineral content, porosity, microcrystalline structure, morphology, surface elements and surface functional groups. These were characterised by inductively coupled plasma (ICP-OES) analysis, nitrogen adsorption analysis, X-ray diffraction (XRD), scanning electron microscopy combined with energy dispersive spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS). Furthermore, this study examined CO2-chemisorption measurements of the char samples to measure both organic and inorganic active sites using thermogravimetric analysis. The CO2-chemisorption method at low temperatures was implemented to quantify the amount of CO2 adsorbed/desorbed within the char’s surface and to identify its role in char reactivity. Key findings include that while the pore structure of chars is indeed a significant characteristic, porosity alone does not exert the primary influence on gasification reactivity. Gasification reactivity was well correlated with CO2 strong chemisorption capacities and kinetic models, which were used to describe CO2 gasification by fitting experimental data with these models.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Elsevier
ISSN:	0016-2361
Funders:	Royal Embassy of Saudi Arabia Cultural Bureau
Date of First Compliant Deposit:	6 November 2024
Date of Acceptance:	14 October 2024
Last Modified:	06 Nov 2024 12:50
URI:	https://orca.cardiff.ac.uk/id/eprint/173564

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