Parameter Optimization and Analysis Method for Determination of Natural Gas Hydrate by Powder X-ray Diffraction

Miao TIAN; Qing-guo MENG; Chang-ling LIU; Cheng-feng LI; Gao-wei HU; Juan FENG; Quan-sheng ZHAO

doi:10.15898/j.cnki.11-2131/td.201703160033

Rock and Mineral Analysis > 2017 > 36(5): 481-488. > DOI: 10.15898/j.cnki.11-2131/td.201703160033

Miao TIAN, Qing-guo MENG, Chang-ling LIU, Cheng-feng LI, Gao-wei HU, Juan FENG, Quan-sheng ZHAO. Parameter Optimization and Analysis Method for Determination of Natural Gas Hydrate by Powder X-ray Diffraction[J]. Rock and Mineral Analysis, 2017, 36(5): 481-488. DOI: 10.15898/j.cnki.11-2131/td.201703160033

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Parameter Optimization and Analysis Method for Determination of Natural Gas Hydrate by Powder X-ray Diffraction

1.
Department of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China
2.
Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China
3.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

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Received Date: March 15, 2017
Revised Date: July 10, 2017
Accepted Date: July 19, 2017
Published Date: August 31, 2017

Abstract

Highlights
· The powder X-ray diffraction measurement for natural gas hydrate is systematically studied, with the analytical parameters being well optimized.

· The proposed method has been effectively applied to measure the crystal structure of natural gas hydrate.

· Both the synthetic methane hydrate in laboratory and the gas hydrate from Pearl River Mouth basin in South China Sea belong to Ⅰ-type hydrate, with unit cell parameters of 11.9135×10^-10 m and 11.9309×10^-10 m, respectively.

ABSTRACT

Gas hydrate is a form of non-stoichiometric clathrate compound which is produced by hydrocarbon gas molecules and water molecules at high pressure and low temperature. Usually under atmospheric pressure and room temperature, the hydrate sample is easy to decompose and thus the analysis must be carried out at low temperature. The analysis conditions of powder X-ray Diffraction for natural gas hydrate is the focus of this study. The influencing factors (i.e., increment, scan speed, cumulative number, and the temperature) were systematically studied to optimize the analytical parameters. As a result, a powder X-ray Diffraction method to measure the crystal structure of gas hydrate is proposed. This method has been used successfully to measure the crystal structure of the hydrate samples from both the laboratory and the Pearl River Mouth basin in the South China Sea. The results show that the hydrate samples have a similar cubic crystal structure. Both the gas hydrate from the Pearl River Mouth basin in the South China Sea and the synthetic methane hydrate in the laboratory belong to the type I hydrate and have unit cell parameters of 11.9309×10^-10 m and 11.9135×10^-10 m, respectively. This method can be used to obtain the structural information of gas hydrate, and will provide a technical support for further research of gas hydrate in China.
- natural gas hydrate,
- powder X-ray Diffraction,
- methane hydrate,
- lattice parameter,
- crystal structure

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References (34)

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