Methane Hydrate Growth Promoted by Microporous Zeolitic Imidazolate Frameworks ZIF-8 and ZIF-67 for Enhanced Methane Storage
Methane Hydrate Growth Promoted by Microporous Zeolitic Imidazolate Frameworks ZIF-8 and ZIF-67 for Enhanced Methane Storage
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DOI：
10.1021/acssuschemeng.1c01488
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发表时间：
2021-06-28
影响因子：
8.4
通讯作者：
Koh, Carolyn A.
中科院分区：
文献类型：
--
作者：
Denning, Shurraya;Majid, Ahmad A. A.;Koh, Carolyn A.
由于人口和经济增长对能源的需求，全球对天然气的需求正在上升。这种需求需要更有效的方法来储存和运输天然气，天然气主要由甲烷组成。天然气水合物是包裹气体分子的冰状材料，具有高能量密度的潜力。这种甲烷储存方法的可行性取决于水合物的形成效率，而水合物的形成效率必须得到提高，才能实现商业化开发。本研究评价了ZIF-8(锌基)和ZIF-67(钴基)两种微孔分子筛咪唑骨架作为甲烷水合物生成促进剂的效果。ZIF-8和ZIF-67使水-甲烷体系的水合物转化率分别从4.5%提高到85.6%和87.7%，使储气量分别提高了14.4和14.7倍。等温实验表明，ZIF-8和ZIF-67使甲烷水合物成核诱导时间分别缩短了51.6%和92.2%。这两种ZIF都保持了其结构的完整性，并表现出一致的可回收性，这表明作为促进剂的材料将具有较长的生命周期。结果表明，ZIF-8和ZIF-67是有效的天然气水合物生长促进剂，ZIF-8和ZIF-67的应用使天然气水合物中甲烷的储存更具工业吸引力。
The demand for natural gas globally is rising due to the need for energy caused by population and economic growth. This demand calls for more effective approaches to store and transport natural gas, which consists primarily of methane. Gas hydrates, ice-like materials that encapsulate gas molecules, possess the potential for high energy density. The feasibility of this methane storage method relies upon the efficiency of hydrate formation, which must be improved before it can be developed commercially. In this study, two microporous zeolitic imidazolate frameworks, ZIF-8 (zinc based) and ZIF-67 (cobalt based), were evaluated as methane hydrate formation promoters. ZIF-8 and ZIF-67 increased the water-to-hydrate conversion in a water-and-methane system from 4.5% to 85.6% and 87.7%, respectively, thus remarkably improving the gas storage by a factor of 14.4 and 14.7, respectively. Isothermal tests revealed that ZIF-8 and ZIF-67 reduced the methane hydrate nucleation induction time by 51.6% and 92.2%, respectively. Both ZIFs maintained their structural integrity and exhibited consistent recyclability, which indicates that the materials would have a long lifecycle as promoters. These results show that ZIF-8 and ZIF-67 are effective gas hydrate growth promoters, and application of these ZIFs makes methane storage in gas hydrates industrially appealing.