Novel ambient-pressure CCUM concept based on nitrate-salt-catalyzed magnesite formation

Abstract

Nitrate salt-mediated carbonation of MgO has been investigated for CO2 absorbers applications but has not been systematically assessed as a potential carbon capture and utilization via mineralization (CCUM) route to produce anhydrous magnesium carbonate (magnesite, MgCO3) at ambient pressures. To this end, we introduce a conceptual CCUM process, and present preliminary data on how process variables affect product purity and morphology. We demonstrate that nitrate-salts-catalyzed CCUM concept shows initial viability and optimize the process for maximal CO2 uptake, employing brucite and periclase as precursors. Data reveals strong morphological changes according to the precursor’s type and catalysts concentration, showing the potential for morphological tuning of the product according to the application requirements. The basic concept is presented and further research needs discussed as well as the main aspects affecting the gate-to-gate boundaries of the approach.