Research progress on strategies to improve the carbon dioxide capture performance of MgO-based adsorbents

Abstract

Carbon dioxide (CO₂) emitted during the use of fossil fuels contributes to the global warming. Carbon capture, utilization and storage (CCUS) technology based on solid material adsorption is recognized as one of the most important means to effectively control and reduce the concentration of CO₂. Magnesium oxide (MgO) is considered as an ideal adsorption material due to its high theoretical adsorption capacity, low regeneration energy consumption and wide temperature applicability. However, its actual adsorption capacity still needs to be further improved. Therefore, the internal reasons restricting the efficient adsorption of CO₂ by MgO are introduced in this review. Meanwhile, the research progress on the preparation and modification of MgO based adsorbents in recent years is summarized. The preparation methods for enhancing the CO₂ adsorption performance of MgO materials are reviewed, and the modification strategies of adsorbents are highlighted, for instance, microstructure modification of MgO, preparation of MgO composite adsorbents and molten salt doping modification. Furthermore, the mechanism behind different modification strategies is analyzed, moreover, the advantages and limitations of the above modification methods are summarized. Herein, the strategies to improve CO₂ capture performance of MgO based adsorbents in recent years are reviewed and summarized. This review would provide insights for the design and preparation of new, cheap and efficient magnesium-based adsorbents in the future.