Citation: Meng Qingguo, Liu Changling, Li Chengfeng, Hao Xiluo, Hu Gaowei, Sun Jianye, Wu Nengyou. Effect of Common Guest Molecules on the Lattice Constants of Clathrate Hydrates[J]. Acta Physico-Chimica Sinica, ;2020, 36(11): 191001. doi: 10.3866/PKU.WHXB201910010 shu

Effect of Common Guest Molecules on the Lattice Constants of Clathrate Hydrates

Meng Qingguo ^1,2,3 ,
Liu Changling ^1,2,, ,
Li Chengfeng ^1,2 ,
Hao Xiluo ^1,2 ,
Hu Gaowei ^1,2 ,
Sun Jianye ^1,2 ,
Wu Nengyou ^1,2

1.
The Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, Shandong Province, P. R. China
2.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, Shandong Province, P. R. China
3.
Chinese Academy of Geological Sciences, Beijing 100037, P. R. China

Corresponding author: Liu Changling, qdliuchangling@163.com
Received Date: 8 October 2019
Revised Date: 6 December 2019
Accepted Date: 9 December 2019
Available Online: 11 December 2019
Fund Project: National Natural Science Foundation of China 41876051National Natural Science Foundation of China 41976074National Key R & D Program of China 2017YFC0307600National Natural Science Foundation of China 41302034the National Marine Geological Survey projects DD20190221The project was supported by the National Marine Geological Survey projects (DD20190221), National Natural Science Foundation of China (41876051, 41976074, 41302034) and National Key R & D Program of China (2017YFC0307600)

Natural gas hydrates are considered as ideal alternative energy resources for the future, and the relevant basic and applied research has become more attractive in recent years. The influence of guest molecules on the hydrate crystal lattice parameters is of great significances to the understanding of hydrate structural characteristics, hydrate formation/decomposition mechanisms, and phase stability behaviors. In this study, we test a series of artificial hydrate samples containing different guest molecules (e.g. methane, ethane, propane, iso-butane, carbon dioxide, tetrahydrofuran, methane + 2, 2-dimethylbutane, and methane + methyl cyclohexane) by a low-temperature powder X-ray diffraction (PXRD). Results show that PXRD effectively elucidates structural characteristics of the natural gas hydrate samples, including crystal lattice parameters and structure types. The relationships between guest molecule sizes and crystal lattice parameters reveal that different guest molecules have different controlling behaviors on the hydrate types and crystal lattice constants. First, a positive correlation between the lattice constants and the van der Waals diameters of homologous hydrocarbon gases was observed in the single-guest-component hydrates. Small hydrocarbon homologous gases, such as methane and ethane, tended to form sI hydrates, whereas relatively larger molecules, such as propane and iso-butane, generated sⅡ hydrates. The hydrate crystal lattice constants increased with increasing guest molecule size. The types of hydrates composed of oxygen-containing guest molecules (such as CO₂ and THF) were also controlled by the van der Waals diameters. However, no positive correlation between the lattice constants and the van der Waals diameters of guest molecules in hydrocarbon hydrates was observed for CO₂ hydrate and THF hydrate, probably due to the special interactions between the guest oxygen atoms and hydrate "cages". Furthermore, the influences of the macromolecules and auxiliary small molecules on the lengths of the different crystal axes of the sH hydrates showed inverse trends. Compared to the methane + 2, 2-dimethylbutane hydrate sample, the length of the a-axis direction of the methane + methyl cyclohexane hydrate sample was slightly smaller, whereas the length of the c-axis direction was slightly longer. The crystal a-axis length of the sH hydrate sample formed with nitrogen molecules was slightly longer, whereas the c-axis was shorter than that of the methane + 2, 2-dimethylbutane hydrate sample at the same temperature.
- Natural gas hydrate,
- PXRD,
- Structure characteristic,
- Lattice constant,
- Guest molecule size
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