CO₂ capture is the selective separation and concentration of carbon dioxide from gas mixtures. The required purity of CO₂ varies depending on the intended use. When capture is coupled with subsequent utilisation (e.g. production of fuels or chemicals), it’s called Carbon Capture and Utilisation (CCU). Alternatively, if the captured CO₂ is stored in geological formations, it’s called Carbon Capture and Storage (CCS), where the focus is on safe storage rather than extreme purity. Both CCU and CCS are key to the transition to a low-carbon economy and to achieving greenhouse gas neutrality.

This thesis explores carbon capture through a multi-faceted approach, coupled with its utilisation via mineralisation in industrial settings. An initial assessment of established carbon capture technologies such as amine scrubbing and VSA revealed challenges for immediate implementation in a secondary steel plant environment. This led to a shift towards the development and evaluation of novel CO₂ capture materials. The metal-organic framework TAMOF-1 showed exceptional CO₂ selectivity in both post-combustion capture and biogas upgrading, demonstrating its potential for industrial use. In order to promote circularity, the thesis also investigated the use of steel slag as a CO₂ storage medium. The in-depth characterisation of these slags provided valuable insights into waste management and resource recovery within the steel industry. This work contributes to the development of sustainable solutions for carbon capture and utilisation via mineralisation, from the evaluation of current technologies to the development of new materials and the reuse of industrial by-products. These findings contribute to the wider goal of mitigating climate change and promoting a sustainable future.