Methane Clathrate Formation is Catalyzed and Kinetically Inhibited by the Same Molecule: Two Facets of Methanol

2021 ◽  
Author(s):  
Zhaoqian Su ◽  
Saman Alavi ◽  
John A. Ripmeester ◽  
Gedaliah Wolosh ◽  
Cristiano L. Dias
Keyword(s):  
Clathrate Formation ◽  
Methane Clathrate

Kinetics of methane clathrate formation and dissociation under Mars relevant conditions

Icarus ◽  
2012 ◽  
Vol 218 (1) ◽  
pp. 513-524 ◽  
Author(s):  
S.R. Gainey ◽  
M.E. Elwood Madden
Keyword(s):  
Clathrate Formation ◽  
Methane Clathrate ◽  
Kinetics Of

Reaction rate constant of methane clathrate formation

Fuel ◽  
2010 ◽  
Vol 89 (2) ◽  
pp. 294-301 ◽  
Author(s):  
Sebastien Bergeron ◽  
Juan G. Beltrán ◽  
Phillip Servio
Keyword(s):  
Rate Constant ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Clathrate Formation ◽  
Methane Clathrate

scholarly journals Unraveling nucleation pathway in methane clathrate formation

2020 ◽  
Vol 117 (40) ◽  
pp. 24701-24708
Author(s):  
Liwen Li ◽  
Jie Zhong ◽  
Youguo Yan ◽  
Jun Zhang ◽  
Jiafang Xu ◽  
...  
Keyword(s):  
Large Scale ◽  
Md Simulations ◽  
Hydration Layer ◽  
Clathrate Formation ◽  
The Earth ◽  
Hydration Layers ◽  
Methane Clathrate ◽  
Water Ring ◽  
Growth Pathway ◽  
Nucleation Growth

Methane clathrates are widespread on the ocean floor of the Earth. A better understanding of methane clathrate formation has important implications for natural-gas exploitation, storage, and transportation. A key step toward understanding clathrate formation is hydrate nucleation, which has been suggested to involve multiple evolution pathways. Herein, a unique nucleation/growth pathway for methane clathrate formation has been identified by analyzing the trajectories of large-scale molecular dynamics (MD) simulations. In particular, ternary water-ring aggregations (TWRAs) have been identified as fundamental structures for characterizing the nucleation pathway. Based on this nucleation pathway, the critical nucleus size and nucleation timescale can be quantitatively determined. Specifically, a methane hydration layer compression/shedding process is observed to be the critical step in (and driving) the nucleation/growth pathway, which is manifested through overlapping/compression of the surrounding hydration layers of the methane molecules, followed by detachment (shedding) of the hydration layer. As such, an effective way to control methane hydrate nucleation is to alter the hydration layer compression/shedding process during the course of nucleation.

Methane storage in tea clathrates

2014 ◽  
Vol 50 (10) ◽  
pp. 1244-1246 ◽  
Author(s):  
Weixing Wang ◽  
Peiyu Zeng ◽  
Xiyi Long ◽  
Jierong Huang ◽  
Yao Liu ◽  
...  
Keyword(s):  
Methane Storage ◽  
Clathrate Formation ◽  
Tea Infusions ◽  
Methane Clathrate ◽  
Kinetics Of

Kinetics of methane clathrate formation can be significantly accelerated by ingredients in tea infusions with a capacity of up to 172 v/v.

scholarly journals Numerical modelling of permafrost spring discharge and open-system pingo formation induced by basal permafrost aggradation

2020 ◽  
Author(s):  
Mikkel T. Hornum ◽  
Andrew J. Hodson ◽  
Søren Jessen ◽  
Victor Bense ◽  
Kim Senger
Keyword(s):  
Conceptual Model ◽  
Open System ◽  
High Arctic ◽  
Pressure Effects ◽  
Spring Discharge ◽  
Driving Mechanism ◽  
Transport Modelling ◽  
Groundwater System ◽  
Clathrate Formation ◽  
Methane Clathrate

Abstract. In the high Arctic valley of Adventdalen, Svalbard, sub-permafrost groundwater feeds several pingo springs distributed along the valley axis. The driving mechanism for groundwater discharge and associated pingo formation is enigmatic because wet-based glaciers in the adjacent highlands and the presence of continuous permafrost seem to preclude recharge of the sub-permafrost groundwater system by either a sub-glacial source or a precipitation surplus. Since the pingo springs enable methane that has accumulated underneath the permafrost to escape directly to the atmosphere, our limited understanding of the groundwater system brings significant uncertainty to the understanding of how methane emissions will respond to changing climate. We address this problem with a new conceptual model for open-system pingo formation wherein pingo growth is sustained by sub-permafrost pressure effects during millennial scale basal permafrost aggradation. We test the viability of this mechanism for generating groundwater flow with decoupled heat (1D-transient) and groundwater (2D-steady-state) transport modelling experiments. Our results show that the pingos in lower Adventdalen easily conform to this conceptual model. Simulations suggest that the generally low-permeability hydrogeological units cause groundwater residence times that exceed the duration of the Holocene. The likelihood of such pre-Holocene groundwater ages is also supported by the hydrogeochemistry of the pingo springs, which demonstrate a sea-wards freshening of groundwater, potentially supplied by paleo-subglacial melting during the Weichselian. Such waters form a sub-permafrost fresh water wedge that progressively thins inland, where the duration of permafrost aggradation is longest. The mixing ratio of the underlying marine waters therefore increases in this direction because less unfrozen freshwater is available for mixing. Although this unusual hydraulic system is most likely governed by permafrost aggradation, the potential for additional pressurization is also explored. We conclude that methane production and methane clathrate formation may also affect hydraulic the pressure in sub-permafrost aquifers, but additional research is needed to fully establish their influence.

The Quasi-Liquid Layer of Ice under Conditions of Methane Clathrate Formation

2012 ◽  
Vol 116 (22) ◽  
pp. 12172-12180 ◽  
Author(s):  
Tricia D. Shepherd ◽  
Matthew A. Koc ◽  
Valeria Molinero
Keyword(s):  
Liquid Layer ◽  
Clathrate Formation ◽  
Quasi Liquid Layer ◽  
Methane Clathrate

Hydroquinone clathrates and the theory of clathrate formation

1985 ◽  
Vol 3 (3) ◽  
pp. 243-260 ◽  
Author(s):  
V. R. Belosludov ◽  
Yu. A. Dyadin ◽  
G. N. Chekhova ◽  
B. A. Kolesov ◽  
S. I. Fadeev
Keyword(s):  
Clathrate Formation

Clathrate formation in binary aqueous systems with CH2Cl2, CHCl3 and CCl4 at high pressures

1990 ◽  
Vol 9 (1) ◽  
pp. 37-49 ◽  
Author(s):  
Yu. A. Dyadin ◽  
F. V. Zhurko ◽  
T. V. Mikina ◽  
R. K. Udachin
Keyword(s):  
High Pressures ◽  
Aqueous Systems ◽  
Clathrate Formation

Clathrate formation and phase transitions in ?-hydroquinone

1985 ◽  
Vol 3 (3) ◽  
pp. 235-242 ◽  
Author(s):  
V. E. Schneider ◽  
E. E. Tornau ◽  
A. A. Vlasova ◽  
A. A. Gurskas
Keyword(s):  
Phase Transitions ◽  
Clathrate Formation
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