New insights into decomposition characteristics of nanoscale methane hydrate below the ice point

In this paper, molecular dynamics simulation was used to study the decomposition process of nanoscale methane hydrate at 1 atm and 227 K. The results predict that methane hydrate decomposes into supercooled water (SCW) and methane gas and the resulting SCW turns into very high density amorphous ice...

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Bibliographic Details
Published in:RSC Advances
Main Authors: Wan, Lihua, Liang, Deqing, Guan, Jinan
Format: Report
Language:English
Published: ROYAL SOC CHEMISTRY 2018
Subjects:
NATURAL-GAS
ANOMALOUS PRESERVATION
MOLECULAR-DYNAMICS
SUPERCOOLED WATER
CRYSTAL-STRUCTURE
CH4 HYDRATE
DISSOCIATION
CARBON
EVOLUTION
LIQUID
Chemistry
Multidisciplinary
Broad Peak
Ice Point
Methane hydrate
Online Access:http://ir.giec.ac.cn/handle/344007/24355
https://doi.org/10.1039/c8ra08955h
Description
Summary:In this paper, molecular dynamics simulation was used to study the decomposition process of nanoscale methane hydrate at 1 atm and 227 K. The results predict that methane hydrate decomposes into supercooled water (SCW) and methane gas and the resulting SCW turns into very high density amorphous ice (VHDA). The density of the VHDA is as high as 1.2-1.4 g cm(-3). The X-ray diffraction phase analysis showed that VHDA has a broad peak at 2 of around 30 degrees. The VHDA encapsulates the methane hydrate crystal so that the crystal can survive for a long time. The dissolved gas from the hydrate melt cannot escape out of the VHDA in a short time. The simulation results reveal new molecular insights into the decomposition behaviour of nanoscale methane hydrate below the ice point.

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