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Promotion mechanism of carbon dioxide hydrate formation by l-Methionine and its competitive effects with NaCl

Author

Listed:
  • Shen, Xiaodong
  • Li, Yang
  • Shen, Long
  • Zeng, Wenjing
  • Zhou, Xuebing
  • He, Juan
  • Yin, Zhenyuan
  • Zhang, Yinde
  • Wang, Xiaoguang

Abstract

The growth kinetics and macroscopic morphology evolution of CO2 hydrate promoted by l-Methionine (L-Met) in NaCl aqueous solutions in a wide range of mass fractions were systematically investigated. 0.05 wt% was the threshold mass fraction of L-Met to have prominent promotion effects in a batch mode. The addition of NaCl could suppress its promotion performance, while it could be regained by further addition of L-Met to 1.0 wt%. Porous feature and wall-climbing phenomena of CO2 hydrate were obvious in the presence of L-Met while it could be suppressed by NaCl. The tangential (lateral) growth rate of the hydrate film on planar pure water surface was the highest while both L-Met and NaCl could decrease it. For L-Met, it was the highest at 0.05 wt%. Special ball-like, mosaic-like and sword-like appearances of CO2 hydrates were found. Both the adsorption-capillary effects of L-Met and the hydration effects of L-Met and NaCl were thought to account for all the phenomena and a detailed scenario was proposed and discussed. A macroscopic growth model based on the tangential growth rates of hydrate films was proposed and evaluated.

Suggested Citation

  • Shen, Xiaodong & Li, Yang & Shen, Long & Zeng, Wenjing & Zhou, Xuebing & He, Juan & Yin, Zhenyuan & Zhang, Yinde & Wang, Xiaoguang, 2024. "Promotion mechanism of carbon dioxide hydrate formation by l-Methionine and its competitive effects with NaCl," Energy, Elsevier, vol. 302(C).
    • Handle: RePEc:eee:energy:v:302:y:2024:i:c:s0360544224016311
    DOI: 10.1016/j.energy.2024.131858
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