Kinetic analysis of CO2 hydrate formation in the aqueous solutions of transition metal chlorides

水合物 水溶液 化学 无机化学 笼状水合物 成核 水溶液中的金属离子 金属 氢键 分子 物理化学 有机化学
作者
Faping Liu,Airong Li,Cheng Wang,Yuling Ma
出处
期刊:Greenhouse Gases-Science and Technology [Wiley]
卷期号:14 (2): 284-294
标识
DOI:10.1002/ghg.2264
摘要

Abstract CO 2 hydrate technology can be applied to seawater desalination. However, the kinetics of CO 2 hydrate formation were inhibited in the aqueous solution with inorganic salts, and the kinetic mechanism of CO 2 hydrate formation for inorganic salts with different metal cations and anions was still unclear. In this work, CO 2 hydrate nucleation and growth were studied in aqueous solutions of metal chlorides. Instead of Na + and K + ions, CO 2 hydrate nucleation was promoted in the presence of Ni 2+ , Mn 2+ , Zn 2+ and Fe 3+ ions due to the co‐ordination bonds between transition metal ions and water molecules to enhance the formation of the critical crystal nuclei. The induction time was increased by 61.1% in aqueous solution with 0.32 mol/L NaCl, while it was shortened by 55.6% in FeCl 3 aqueous solution at the same concentration of Cl − anions. In the process of CO 2 hydrate growth, Cl − ions played a more important role than the metal ions in affecting the stability of CO 2 hydrate cages. The gas storage capacity was reduced by 10.3% in the presence of NaCl, and was lower than that of other metal chlorides. Cl − anions were absorbed on the hydrate surface and involved in hydrate cages to inhibit the hydrate growth due to the hydrogen bonds between the Cl − ions and water molecules of the hydrate cages. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.
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