(612h) Comparative Analysis of Alkali Metal Nitrate Salt-Promoted_Mg-Ce Mixed Metal Oxides Prepared By Different Synthesis Methods for Low-Concentration CO2 Capture

Global warming has been seriously accelerating in recent years, and anthropogenic emissions of greenhouse gases (GHG), notably carbon dioxide, stand as primary contributors. Addressing this issue necessitates the advancement of carbon dioxide capture and storage (CCS), a technology consisting of the separation, transportation, and storage of carbon dioxide. Given that carbon dioxide capture constitutes a significant portion of CCS costs, efficient capture technologies are imperative. Among many carbon dioxide capture technologies, adsorption varies in adsorbent selection based on application and temperature range. Magnesium oxide (MgO)-based adsorbents have the advantage of being able to capture carbon dioxide directly from exhaust gases from 200 to 400 ℃ without cooling process. However, pure MgO exhibits diminished adsorption capacity under low-concentration carbon dioxide conditions typical of exhaust gas compositions. This limitation was mitigated by incorporating additional metal such as cerium (Ce) and alkali metal nitrate salts to enhance adsorption capability. Furthermore, various synthesis methods for Mg-Ce mixed metal oxide-based adsorbents were compared to identify an optimal approach yielding the highest performance.