Porous Organic Cage CC3: An Effective Promoter for Methane Hydrate Formation for Natural Gas Storage
Porous Organic Cage CC3: An Effective Promoter for Methane Hydrate Formation for Natural Gas Storage
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DOI：
10.1021/acs.jpcc.1c04657
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发表时间：
2021-09-08
影响因子：
3.7
通讯作者：
Koh, Carolyn A.
中科院分区：
文献类型：
--
作者：
Denning, Shurraya;Lucero, Jolie M.;Koh, Carolyn A.
本文中，使用高压差示扫描量热仪证明了将气体水合物与新型原型多孔有机笼（表示为CC 3（具有金刚石孔的微孔晶体结构））组合用于甲烷储存的协同效应。添加CC 3显著改善了甲烷水合物形成的程度，将水-水合物转化率从4.5%增加到87.5%，从而将甲烷相对于系统中的水的储存量从0.42 mmol/g增加到8.1 mmol/g。CC 3的存在也将诱导时间一致地降低至0.8 +/-0.1小时，而在没有CC 3的情况下，在5.9 +/-3.9小时的诱导时间下，水合物仅形成30%的时间。这种转化率的增加和诱导时间的减少归因于CC 3的大表面积、高甲烷吸附和可逆的水吸收。水合物分解温度降低了1.6摄氏度，表明水合物形成发生在CC 3的有限空间中，最有可能是在其空隙和间隙中。CC 3显示出显著的稳定性、可再循环性，并且在促进甲烷水合物形成以实现甲烷储存的高容量方面表现出增强的性能。
Herein, the synergistic effect of combining gas hydrates with a novel prototypical porous organic cage, denoted as CC3 (microporous crystalline structure with diamondoid pores), for methane storage is demonstrated using a high-pressure differential scanning calorimeter. Adding CC3 improved the extent of methane hydrate formation significantly, increasing the water-tohydrate conversion from 4.5 to 87.5%, thus increasing the amount of methane stored relative to the water in the system from 0.42 to 8.1 mmol/g. The presence of CC3 also decreased the induction time consistently to 0.8 +/- 0.1 h, whereas without CC3, hydrates only formed 30% of the time at 5.9 +/- 3.9 h of induction time. This increase in conversion and decrease in induction time is attributed to CC3's large surface area, high methane adsorption, and reversible water uptake. A depression in the hydrate dissociation temperature by as much as 1.6 degrees C suggests hydrate formation occurred in the confined space in CC3, most likely in its void and interstitial spacing. CC3 displayed remarkable stability, recyclability, and enhanced performance in promoting methane hydrate formation to achieve a high capacity for methane storage.