A strong solid base, FeO–MgO, is synthesized using magnesium acetate and ferrous acetate in order to meet the requirement of capturing CO₂ in flue gas at a temperature higher than 423 K. After the two salts are ground and carbonized at 823 K, the ferric MgO composite with a surface area exceeding 160 m² g⁻¹ is obtained, where ferric oxide species are wrapped by magnesia particles. The influence of ferric salt on the structure and adsorption properties of the strong solid bases is investigated to determine the optimal amount, and the distribution of ferric additive is assessed with X‐ray diffraction (XRD) and X‐ray photoelectron spectroscopy (XPS). With a mass ratio of ferrous oxide of about 3%, the basic sorbent could capture 35 mg g⁻¹ CO₂ at 473 K and the ratio of strong base sites increases to 91%. Both the CO₂ adsorption capacity and the ratio of strong basic sites are higher than those of the other MgO sorbents, which is beneficial for warm CO₂ capture. Additionally, the function of strong basic sites in the ferric MgO sorbent is explored in the instantaneous adsorption of warm CO₂. The capability in the cycled warm CO₂ adsorption is found to be related to the desorption temperature of CO₂. Different forms of CO₂ injections are used in adsorption and the influence on the performance of the strong basic sorbent is also studied.

中文翻译：

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强固型FeO-MgO的制备，用于热CO2捕集

为了满足在高于423 K的温度下捕集烟道气中CO ₂的要求，使用乙酸镁和乙酸亚铁合成了坚固的固体碱FeO–MgO 。将两种盐研磨并在823 K碳化后，得到表面积超过160m ²  g ^-1的MgO铁复合材料，其中氧化铁颗粒被氧化镁颗粒包裹。研究了铁盐对强固碱的结构和吸附性能的影响，以确定最佳用量，并通过X射线衍射（XRD）和X射线光电子能谱（XPS）评估了铁添加剂的分布。当氧化亚铁的质量比约为3％时，碱性吸附剂可捕获35 mg g ^-1473 K下的CO ₂和强碱的比例增加到91％。CO _2的吸附能力和强碱性部位的比率均高于其他MgO吸附剂，这有利于温暖的CO ₂捕集。另外，在热CO ₂的瞬时吸附中探索了MgO铁吸附剂中强碱性位点的功能。在循环温暖CO的能力₂吸附被发现涉及到CO的解吸温度₂。吸附使用了不同形式的CO ₂注入，并研究了其对强碱性吸附剂性能的影响。