Effect of Organic Matters on CO2 Hydrate Formation in Ulleung Basin Sediment Suspensions

详细信息    查看全文

• 作者：Rheo B. Lamorena ; Daeseung Kyung ; Woojin Lee
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：July 15, 2011
• 年：2011
• 卷：45
• 期：14
• 页码：6196-6203
• 全文大小：905K
• 年卷期：v.45,no.14(July 15, 2011)
• ISSN：1520-5851

文摘

Marine sediment core samples collected from a gas hydrate deposit site (Ulleung Basin (UB), East Sea, Korea) were explored to identify the role of sediment organic matters (SOMs) on the formation of CO₂ hydrate. Two distinct CO₂ hydrate formation regimes (favorable (鈮?0 min) and unfavorable (>250 min)) were observed from the hydrate formation tests. CO₂ hydrate induction time in UB sediment suspensions was approximately seven times faster than that in UB sediment suspensions without SOMs (baked UB), showing a direct influence of SOMs. Spectrometric and spectroscopic analyses confirmed the existence of different types of SOMs including nonhumic and humic substances in UB sediment samples. We found SOMs with aromatic ring structures in all sediment extracts and SOMs with amine and amide groups and lignin in alkaline extracts. SOMs were extracted from UB sediment core samples (1 g each). Measured CO₂ hydrate induction times were different in baked UB sediment suspensions with different extracts of UB sediments. The experimental results demonstrated that SOMs can play a significant role to accelerate the formation of CO₂ hydrate in UB sediment suspensions, suggesting that the gas hydrate deposit site at UB may be a proper place for CO₂ sequestration as a form of CO₂ hydrate.