Khussain Bolatbek, Sass Alexandr, Brodskiy Alexandr, Zhurinov Murat, Torlopov Ivan, Rakhmetova Kenzhegul, Zhumadullaev Daulet, Boleubayev Yerzhan, Khussain Atabek, Kenessary Abzal, Sarsenova Adel, Darzhokov Tumen
D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry, 142, Kunaev Str., Almaty 050010, Kazakhstan.
Kazakh Institute of Oil and Gas, 506/99, Seifullin Ave., Almaty 050000, Kazakhstan.
Molecules. 2025 Jul 4;30(13):2859. doi: 10.3390/molecules30132859.
This study presents the results of an investigation of carbonate-containing sorbents for CO capture with natural support materials-kaolin and calcium carbonate-at various loadings of the active phase of NaCO. The effects of the support type on the distribution of the active component, phase composition, and pore structure of the sorbents were studied. It was found that a NaCO loading of 25 wt.% provides the best balance between sorption capacity and technological feasibility. The thermal stability and regeneration capacity of the sorbents were evaluated under high-temperature conditions, revealing high thermal stability of the NaCO/CaCO system up to 1000 °C, along with its durability over multiple adsorption-desorption cycles. Kinetic studies on the NaCO/CaCO sorbent using the shrinking core model demonstrated that the overall CO chemisorption process is controlled by surface chemical reaction at temperatures below 50 °C. The obtained results demonstrate the high potential of CaCO-based sorbents for practical applications in low-temperature CO capture technologies. A promising direction for the use of such sorbents within CCUS is the development of integrated systems, where CO capture is combined with its conversion into valuable products (e.g., methane, methanol, formic acid) through catalytic processes.
本研究展示了一项关于使用天然载体材料高岭土和碳酸钙，在不同负载量的活性相Na₂CO₃条件下，用于捕获CO₂的含碳酸盐吸附剂的研究结果。研究了载体类型对吸附剂中活性成分分布、相组成和孔结构的影响。结果发现，25 wt.%的Na₂CO₃负载量在吸附容量和技术可行性之间提供了最佳平衡。在高温条件下评估了吸附剂的热稳定性和再生能力，结果表明，Na₂CO₃/CaCO₃体系在高达1000°C的温度下具有高的热稳定性，并且在多个吸附-解吸循环中具有耐久性。使用收缩核模型对Na₂CO₃/CaCO₃吸附剂进行的动力学研究表明，在低于50°C的温度下，整个CO₂化学吸附过程受表面化学反应控制。所得结果表明，基于CaCO₃的吸附剂在低温CO₂捕获技术的实际应用中具有很高的潜力。在碳捕获、利用与封存（CCUS）中使用此类吸附剂的一个有前景的方向是开发集成系统，其中CO₂捕获与通过催化过程将其转化为有价值的产品（例如甲烷、甲醇、甲酸）相结合。
