模拟海底沉积物中的强化二氧化碳水合物形成动力学：在碳捕获和封存中的应用,Energy & Fuels

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模拟海底沉积物中的强化二氧化碳水合物形成动力学：在碳捕获和封存中的应用
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-08-09 , DOI: 10.1021/acs.energyfuels.2c01815
Rupali Gautam ₁ , Sanat Kumar ₁ , Asheesh Kumar ₁

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为了实现联合国气候变化会议 (COP-26) 的净零碳排放目标，水合物基二氧化碳 (CO ₂ ) 捕获和封存 (CCS) 可被视为潜在的可持续技术之一。然而，在咸水海底环境中 CO ₂水合物形成的缓慢动力学和现有添加剂（动力学促进剂）的非环保性质是主要挑战。因此，为了加强动力学，使用模拟的硅砂海底沉积物评估生物相容性疏水氨基酸l-亮氨酸对 CO _{2水合物形成/解离的性能。}实验在盐水（3.0 wt % NaCl）和非盐水环境中进行-亮氨酸 (0.1–1.0 wt %)，压力为 3.2 ± 0.2 MPa，温度为 274.5 ± 0.2 K。在淡水中加入 0.5 wt% l-亮氨酸后，水对水合物的转化率为 73.01 ± 4.96%（气体对水合物的转化率为 44.08 ± 2.95%），气体吸收率为 4.25 ± 0.39 mmol/ min，比基线（无启动子）高 10 倍。尽管盐度显着降低了水合物的形成动力学，但添加 1.0 wt% l-亮氨酸将 CO ₂吸收率从盐水基线中的 0.55 ± 0.033 mmol/min 提高到 2.32 ± 0.319 mmol/min。这项工作中报告的增强动力学突出了在基于水合物的 CCS 方法中使用l-亮氨酸的潜力。

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Intensified Carbon Dioxide Hydrate Formation Kinetics in a Simulated Subsea Sediment: Application in Carbon Capture and Sequestration

To achieve the United Nations Climate Change Conference (COP-26) targets of net zero carbon emissions, hydrate-based carbon dioxide (CO₂) capture and sequestration (CCS) can be considered one of the potential sustainable technologies. However, the sluggish kinetics of CO₂ hydrate formation in the saline subsea environment and the non-ecofriendly nature of the existing additives (kinetic promoters) are the major challenges. Therefore, to intensify the kinetics, the performance of the biocompatible hydrophobic amino acid l-leucine for CO₂ hydrate formation/dissociation was evaluated using the simulated subsea sediment of silica sand. Experiments were performed in saline (3.0 wt % NaCl) and nonsaline environments with l-leucine (0.1–1.0 wt %) at 3.2 ± 0.2 MPa pressure and 274.5 ± 0.2 K temperature. With the addition of 0.5 wt % l-leucine to freshwater, water-to-hydrate conversion of 73.01 ± 4.96% (44.08 ± 2.95% gas-to-hydrate conversion) was achieved with a rate of gas uptake of 4.25 ± 0.39 mmol/min, which is ∼10 times higher compared to the baseline (no promoter). Though salinity significantly reduced the hydrate formation kinetics, the addition of 1.0 wt % l-leucine intensified the rate of CO₂ uptake to 2.32 ± 0.319 mmol/min from 0.55 ± 0.033 mmol/min in saline water baseline. The enhanced kinetics reported in this work highlights the potential of engaging l-leucine in the hydrate-based CCS approach.

更新日期：2022-08-09

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