Enhanced CO2 capture and stability of MgO modified with alkali metal nitrates and carbonates at moderate temperature
IF 2.8
4区 生物学
Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Shuaipeng Li, Neng Guo, Dongdong Zhu, Dazhan Jiang, Zhenting Chen, Shengwen Chen, Zhiguo Sun, Jifen Wang
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Abstract
BACKGROUNDMagnesium oxide (MgO) is favored for solid‐state carbon dioxide (CO2) capture due to its high theoretical adsorption capacity, abundant reserves, low cost, and environmental friendliness. However, its practical application in industry is hindered by low CO2 adsorption capacity under moderate operating conditions. In this work, MgO was modified by a deposition method using LiNO3, NaNO3, KNO3, Na2CO3 and K2CO3 as additives.RESULTSThe study determines optimal ratios within the [(Li, Na, K)x − (Na, K)]y/MgO system, specifically identifying x = 0.5 and y = 0.15 as most effective. At 275 °C under pure CO2 conditions, the adsorption capacity peaks at 0.631 g CO2 g−1 adsorbent. Effective regeneration of the adsorbent occurs at 400 °C under 100% N2 for 15 min. Under Integrated Gasification Combined Cycle (IGCC) conditions, the adsorption capacity stabilizes at 0.462 g g−1 after 20 cycles, representing a 25% decrease from initial capacity.CONCLUSIONExperimental findings demonstrate that the inclusion of alkali metal salts in MgO precursors enhances the adsorbent's microstructure, thereby improving its CO2 capture efficiency and bolstering cycling stability. This research enhances our understanding of the factors influencing CO2 adsorption and cyclic stability in alkali metal salt‐promoted MgO, providing valuable insights for further refinement in the formulation and synthesis protocols of MgO‐based CO2 adsorbents. © 2024 Society of Chemical Industry (SCI).
用碱金属硝酸盐和碳酸盐修饰的氧化镁在中温条件下增强二氧化碳捕获能力和稳定性
背景氧化镁(MgO)因其理论吸附容量高、储量丰富、成本低廉和环境友好而成为固态二氧化碳(CO2)捕集的首选。然而,由于在中等操作条件下的二氧化碳吸附能力较低,阻碍了其在工业中的实际应用。在这项研究中,使用 LiNO3、NaNO3、KNO3、Na2CO3 和 K2CO3 作为添加剂,通过沉积法对氧化镁进行了改性。结果该研究确定了 [(Li, Na, K)x - (Na, K)]y/MgO 体系中的最佳比率,特别是 x = 0.5 和 y = 0.15 最为有效。在 275 °C 的纯二氧化碳条件下,吸附容量在 0.631 g CO2 g-1 吸附剂时达到峰值。吸附剂在 400 ℃、100% N2 条件下 15 分钟后可有效再生。在整体煤气化联合循环 (IGCC) 条件下,吸附容量在 20 次循环后稳定在 0.462 g g-1 的水平,比初始容量下降了 25%。实验结果表明,在氧化镁前驱体中加入碱金属盐可以增强吸附剂的微观结构,从而提高其二氧化碳捕集效率并增强循环稳定性。这项研究加深了我们对影响碱金属盐促进氧化镁吸附二氧化碳和循环稳定性的因素的理解,为进一步完善氧化镁基二氧化碳吸附剂的配方和合成方案提供了宝贵的见解。© 2024 化学工业学会(SCI)。
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