Adsorption technology has been introduced as one approach to reduce CO₂ emissions into the Earth’s atmosphere. MgO-based adsorbents are promising due to their abundant availability, wide temperature range, and tuneable physicochemical properties. Over the last decade, there has been a growing number of MgO-based adsorbent studies using various improved approaches that have achieved high CO₂ capture performance. For instance, modification using metal/non-metal hybrids and the introduction of promoters, such as alkali metal nitrate/carbonate, and amines to the MgO adsorbent have a significant impact toward enhancing the CO₂ uptake capacity and performance stability. Therefore, it is important to provide the latest review on MgO-based adsorbents prepared via various modification strategies using promoters, such as alkali metal nitrate/carbonate (molten salt), amines, and metal oxides, and their relationship with the CO₂ uptake performance. In this study, the adsorbent preparation method and CO₂ adsorption mechanism are discussed, in which the ambient adsorption pressure conditions, which is typically related to the flue gas of the post-combustion working conditions, were emphasised. Several recommendations for future studies have also been proposed.

引入吸附技术是减少向大气层排放CO _2的一种方法。基于MgO的吸附剂因其丰富的可用性，宽温度范围和可调节的理化特性而很有希望。在过去的十年中，越来越多的基于MgO的吸附剂研究使用各种改进的方法实现了很高的CO ₂捕集性能。例如，使用金属/非金属杂化物进行改性以及在MgO吸附剂中引入促进剂（例如碱金属硝酸盐/碳酸盐和胺）对提高CO ₂有重大影响。吸收能力和性能稳定性。因此，重要的是提供有关通过使用促进剂（例如碱金属硝酸盐/碳酸盐（熔融盐），胺和金属氧化物）的各种改性策略制备的MgO基吸附剂的最新综述，以及它们与CO ₂吸收性能的关系。。在这项研究中，讨论了吸附剂的制备方法和CO ₂吸附机理，其中重点强调了环境吸附压力条件，该条件通常与燃烧后工作条件下的烟气有关。还提出了一些对未来研究的建议。