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Carbon dioxide (CO2) emissions are a major driver of global warming, prompting growing interest in carbon capture and storage (CCS) technologies. Among emerging approaches, sequestrating carbon into marine sediments has gained attention, as it enables the formation of gas hydrates that can securely store CO2. Despite its potential, the effectiveness of this method strongly depends on the kinetics of hydrate formation and hydrate stability, especially in marine clay sediments. In particular, variations in salinity within marine environments can significantly influence hydrate behaviour, making a detailed understanding of these kinetic processes essential for the safe and efficient implementation of hydrate-based CO2 storage strategies in marine sediments. In this study, hydrate formation kinetics and stability were analysed in marine sedimentary conditions using Krishna-Godavari (K-G) basin clay sand media by mimicking actual subsea parameters. The effects of various environmentally friendly additives, specifically amino acids (AA), as well as the synergistic kinetic promotion of gas hydrate formation by combined amino acids (AA) and 1,3-dioxolane, were systematically investigated. Investigation demonstrates that both methionine and tryptophan enhances hydrate formation kinetics than seawater and seawater+clay system and nearly 2 and 1.4 times improvement in gas hydrate conversion have been observed. Tryptophan slightly (3-5 %) outperform methionine in terms of kinetic promotion and humic acid potassium salt decreases overall kinetics of hydrate formation. The combine DIOX+AA systems demonstrated nearly 10-15% improvement in overall gas uptake in hydrate with KG clayey sand. The ex-situ morphological analysis shows porous, muddy morphologies with tryptophan and methionine and porous granular morphology with clay alone system. Furthermore, higher hydrate stability and inhibited hydrate dissociation kinetics have been observed in all clayey systems. The findings of this study is crucial and have potential to replace toxic chemical additives with low–environmental-footprint bio promoters, enabling enhanced hydrate formation kinetics and stability for long-term CO₂ storage in subsea sediments.
| References | 1. Eti Pagar, Sai Kiran Burla, Vimal Kumar, Hari Prakash Veluswamy, Influence of amino acids on gas hydrate formation and dissociation kinetics using flue gas (CO2 + N2 mixture) in silica sand under saline/non-saline conditions for CO2 sequestration, Applied Energy, Volume 367, 2024, 123460. |
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| Country | India |
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