Unraveling the Role of Amino Acid L-Tryptophan Concentration in Enhancing CO2 Hydrate Kinetics

IF 3 4区工程技术 Q3 ENERGY & FUELS

Energies Pub Date : 2024-07-26 DOI:10.3390/en17153702

Yan Li, A. Gambelli, Yizhi Rao, Xuejian Liu, Zhenyuan Yin, F. Rossi

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引用次数: 0

Abstract

Carbon dioxide (CO2) hydrates have garnered significant interest as a promising technology for CO2 capture and storage due to its high storage capacity and moderate operating conditions. The kinetics of CO2 hydrate formation is a critical factor in determining the feasibility of hydrate-based CO2 capture and storage technologies. This study systematically investigates the promotional effects of the amino acid L-tryptophan (L-trp) on CO2 hydrate formation kinetics and morphology under stirred and unstirred conditions. In the stirred system, experiments were conducted in a high-pressure 100 mL reactor with 0.05, 0.10, and 0.30 wt% L-trp solution. CO2 gas uptake kinetics and morphological evolution were monitored using a high-resolution digital camera. Results showed that L-trp promoted CO2 hydrate formation kinetics without delay, with rapid CO2 consumption upon nucleation. Morphological evolution revealed rapid hydrate formation, wall-climbing growth, and dendritic morphology filling the bulk solution. Under unstirred conditions, experiments were performed in a larger 1 L reactor with 0.1 wt% and 0.5 wt% L-trp solutions to assess the influence of additive concentration on hydrate formation thermodynamics and kinetics. Results demonstrated that L-trp influenced both thermodynamics and kinetics of CO2 hydrate formation. Thermodynamically, 0.1 wt% L-trp resulted in the highest hydrate formation, indicating an optimal concentration for thermodynamic promotion. Kinetically, increasing L-trp concentration from 0.1 wt% to 0.5 wt% reduced formation time, demonstrating a proportional relationship between L-trp concentration and formation kinetics. These findings provide insights into the role of L-trp in promoting CO2 hydrate formation and the interplay between additive concentration, thermodynamics, and kinetics. The results can inform the development of effective hydrate-based technologies for CO2 sequestration, highlighting the potential of amino acids as promoters in gas hydrate.

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揭示氨基酸 L-色氨酸浓度在增强二氧化碳水合物动力学中的作用

由于二氧化碳（CO2）水合物具有高储存能力和适中的操作条件，因此作为一种很有前景的二氧化碳捕获和储存技术受到了广泛关注。二氧化碳水合物形成的动力学是决定基于水合物的二氧化碳捕集与封存技术可行性的关键因素。本研究系统研究了氨基酸 L-色氨酸（L-trp）在搅拌和非搅拌条件下对二氧化碳水合物形成动力学和形态的促进作用。在搅拌系统中，实验在一个 100 mL 的高压反应器中进行，L-trp 溶液的重量分别为 0.05、0.10 和 0.30%。使用高分辨率数码相机对二氧化碳气体吸收动力学和形态演变进行了监测。结果表明，L-trp 无延迟地促进了二氧化碳水合物的形成动力学，并在成核后迅速消耗二氧化碳。形态演变显示了水合物的快速形成、爬壁生长以及充满溶液的树枝状形态。在无搅拌条件下，在较大的 1 L 反应器中使用 0.1 wt% 和 0.5 wt% L-trp 溶液进行了实验，以评估添加剂浓度对水合物形成热力学和动力学的影响。结果表明，L-trp 对二氧化碳水合物形成的热力学和动力学都有影响。从热力学角度看，0.1 wt% L-trp 的水合物形成率最高，表明这是促进热力学的最佳浓度。从动力学角度看，L-trp 浓度从 0.1 wt% 增加到 0.5 wt% 会缩短形成时间，这表明 L-trp 浓度与形成动力学之间存在比例关系。这些发现有助于深入了解 L-trp 在促进二氧化碳水合物形成中的作用，以及添加剂浓度、热力学和动力学之间的相互作用。这些结果可为开发有效的基于水合物的二氧化碳封存技术提供信息，同时突出了氨基酸作为气体水合物促进剂的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Energies ENERGY & FUELS-

CiteScore

6.20

自引率

21.90%

发文量

8045

审稿时长

1.9 months

期刊介绍： Energies (ISSN 1996-1073) is an open access journal of related scientific research, technology development and policy and management studies. It publishes reviews, regular research papers, and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.