Kinetic characteristics of methane hydrate in functionalized multi-walled carbon nanotubes and L-leucine compounding system
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摘要:
加快天然气水合物形成, 对基于水合物法的天然气储运、气体分离和二氧化碳捕集技术的推动具有重要意义。采用恒温恒容法研究了
w B=0.05%功能化(羟基化、羧基化和氨基化)多壁碳纳米管和w B=1.0% L-亮氨酸复配体系中甲烷水合物动力学特征。研究表明, 多壁碳纳米管、羧基化和羟基化多壁碳纳米管与L-亮氨酸的复配, 可使甲烷水合物诱导成核时间大幅缩短至25, 22, 13 min左右, 促进效果与典型促进剂十二烷基硫酸钠相当, 且促进效果优于单一添加剂体系。复配体系甲烷储气质量分数具有良好表现, 可达136~142 mg/g。对甲烷平均吸收速率和瞬时吸收速率的分析表明, 多壁碳纳米管对生长阶段甲烷水合物的生长动力学影响很小。复配体系和L-亮氨酸体系中甲烷水合物的生长具有相似性, 均呈现出甲烷气体吸收速率快速增加到最大值, 然后迅速下降并完成生长的特点。综合分析表明, 多壁碳纳米管和L-亮氨酸的复配对甲烷水合物的成核速率具有协同增强效应, 而生长阶段的进程与速率主要受L-亮氨酸影响。该研究为探索不同类型添加剂在强化甲烷水合物生成动力学上的差异化机理提供了新思路。Abstract:Objective Accelerated the generation of natural gas hydrate is crucial for advancing hydrate-based technologies such as gas storage, gas separation, and CO2 capture.
Methods The kinetic characteristics of methane hydrate generated with the
w B=0.05% functionalized (hydroxylated, carboxylated, and aminated) multi-walled carbon nanotubes(MWCNT) system, and in combination with thew B=1.0% L-leucine were investigated through constant temperature and constant volume methods.Results The combination of multiwalled carbon nanotubes and carboxylated and hydroxylated multiwalled carbon nanotubes with L-leucine, significantly reduced the induction time for natural gas hydrate nucleation to approximately 25, 22, and 13 minutes, respectively. This promotion effect is comparable to that of the typical promoter sodium dodecyl sulfate, and the promotion effect is better than that of a single additive system. The methane storage density of the compounded system reached 136-142 mg/g. Analysis of both the average and instantaneous methane uptake rates indicated that multiwalled carbon nanotubes had minimal impact on the growth kinetics of methane hydrate during the growth phase. The growth of methane hydrate in both the compounded and L-leucine systems were similar, characterized by a rapid increase in uptake rate to a peak value, followed by a rapid decrease and eventual completion of the growth phase.
Conclusion A comprehensive analysis suggests that the combination of MWCNTs and L-leucine synergistically enhances the nucleation rate of methane hydrate, whereas the process and rate of the growth phase are predominantly influenced by L-leucine. This study presents a new idea for exploring the differentiation mechanism of different types of additives in enhancing the kinetics of methane hydrate generation.
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Key words:
- methane hydrate /
- multi-walled carbon nanotube /
- L-leucine /
- synergistic promotion /
- nucleation /
- growth
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