Hydrate-based CO capture technology can effectively reduce greenhouse gas emissions. However, the slow rate of hydrate formation limits the practical application of this technology. In this study, the synergistic promotion effect of multi-walled carbon nanotubes (MWCNTs) coupled with L-methionine (L-met) on CO hydrate formation kinetics were investigated to accelerate the rate of hydrate formation and increase the gas consumption. The results showed a synergistic promotion effect occurred between L-met and MWCNTs when using L-met coupled with MWCNTs, with the optimal concentration was found to be 0.1250 wt% L-met coupled with 0.0450 wt% MWCNTs. Compared to the pure water system, the induction time of the compound system was effectively shortened by an average of 81.03 %, and the gas consumption was enhanced by an average of 21.50 %. Meanwhile, the initial rate of gas consumption was increased by 334.78 %, 24.33 %, and 106.49 % compared to the pure water, 0.1250 wt% L-met, and 0.0450 wt% MWCNTs single systems, respectively. Additionally, the Fourier infrared spectra revealed the existence of hydrogen bonding and hydrophobic interaction in the L-met coupled with the MWCNTs system, facilitating the mixing L-met with water molecules through hydrogen bonding. The kinetics experiments and morphological observations revealed that low-dose MWCNTs promoted the initial rate of CO hydrate nucleation and growth, and the L-met promoted the subsequent CO hydrate growth along the surface of the reactor. This work contributed to providing an experimental basis for the practical application of hydrate technology to capture and sequester CO.

中文翻译：

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L-蛋氨酸与多壁碳纳米管结合对CO2水合物形成动力学的协同促进

基于水合物的二氧化碳捕集技术可以有效减少温室气体排放。然而，水合物形成速度慢限制了该技术的实际应用。在本研究中，研究了多壁碳纳米管（MWCNT）与L-蛋氨酸（L-met）耦合对CO水合物形成动力学的协同促进作用，以加快水合物形成速率并增加气体消耗。结果表明，当L-met与MWCNTs结合使用时，L-met与MWCNTs之间发生协同促进作用，最佳浓度为0.1250 wt% L-met与0.0450 wt% MWCNTs结合。与纯水系统相比，复合系统的诱导时间平均缩短了81.03%，耗气量平均提高了21.50%。同时，与纯水、0.1250 wt% L-met和0.0450 wt% MWCNTs单一系统相比，初始气体消耗率分别增加了334.78%、24.33%和106.49%。此外，傅里叶红外光谱揭示了L-met与MWCNT系统耦合时存在氢键和疏水相互作用，促进L-met通过氢键与水分子混合。动力学实验和形态观察表明，低剂量MWCNT促进了CO水合物成核和生长的初始速率，L-met促进了随后CO水合物沿反应器表面的生长。这项工作为水合物技术捕获和封存CO的实际应用提供了实验基础。