Transformations in methane hydrates

IM Chou, A Sharma, RC Burruss… - Proceedings of the …, 2000 - National Acad Sciences
… In the present study, synthetic sI methane hydrate (17) was loaded in the sample chamber
of a diamond cell (18). We found that methane hydrate transforms to a phase with different …

Temperature‐and pressure‐dependent structural transformation of methane hydrates in salt environments

D Shin, M Cha, Y Yang, S Choi, Y Woo… - Geophysical …, 2017 - Wiley Online Library
methane hydrate forms a mixture of type I clathrate hydrate, ice, and hydrated salts. Under a
low-pressure condition, however, the methane hydrates … from the surface of hydrate crystals, …

Transformation of methane hydrate to carbon dioxide hydrate: In situ Raman spectroscopic observations

JH Yoon, T Kawamura, Y Yamamoto… - … International Ocean and …, 2005 - onepetro.org
… arguments for the guest replacement of methane hydrate with carbon dioxide using in …
hydrate formed in the outer layer plays a key function of retarded dissociation of methane hydrate

Methane transformation by photocatalysis

X Li, C Wang, J Tang - Nature Reviews Materials, 2022 - nature.com
Methane hydrate and shale gas are predicted to have substantial reserves, far beyond the
sum of other fossil fuels. Using methane … Because methane is so inert, its direct conversion …

In situ observations of high-pressure phase transformations in a synthetic methane hydrate

H Shimizu, T Kumazaki, T Kume… - The Journal of Physical …, 2002 - ACS Publications
A methane hydrate (MH) single crystal was synthesized in a diamond anvil cell to investigate
its intrinsic high-pressure properties. With increasing pressure, the cubic sI phase of MH …

Surface transformation of methane–ethane sI and sII clathrate hydrates

SF Dec - The Journal of Physical Chemistry C, 2012 - ACS Publications
… phases are not intimately mixed is consistent with identifying eq 3 as the dominant reaction
pathway for the C1–C2 sI ↔ sII hydrate transformation observed in this work. The validity of …

Transformation of deep‐water methane bubbles into hydrate

AV Egorov, RI Nigmatulin, AN Rozhkov - Geofluids, 2014 - Wiley Online Library
… of methane bubble phase behavior in the gas hydrate … of methane hydrates can be formed
from deep-water methane … The types of hydrate structures control the rate of methane hydrate

Structural transformation of methane hydrate from cage clathrate to filled ice

T Ikeda, K Terakura - The Journal of chemical physics, 2003 - pubs.aip.org
The structural, dynamical, and electronic properties of methane hydrate under pressure and
at room temperature are investigated using the ab initio constant pressure molecular …

High-pressure transitions in methane hydrate

JS Loveday, RJ Nelmes, M Guthrie - Chemical physics letters, 2001 - Elsevier
… Our own neutron and X-ray studies of the compression behaviour along the room temperature
isotherm have shown that methane hydrate transforms below 0.9 GPa to a new hydrate

Phase transitions in mixed gas hydrates: experimental observations versus calculated data

JM Schicks, R Naumann, J Erzinger… - The Journal of …, 2006 - ACS Publications
… process is not yet known, we observed the transformation of the light and the dark euhedral
hydrate crystals in Area 1 into sI methane hydrate and sII methane (+ ethane) + propane …