Article
Engineering, Environmental
Ki Hun Park, Dong Hyun Kim, Minjun Cha
Summary: A new structure II (sII) hydrate former, cyclobutanemethanol (CBM), was discovered for potential gas storage applications. The binary (CBM + CH4) hydrate showed higher thermodynamic stability and superior CH4 storage capacity compared to other hydrates, indicating potential for gas storage applications.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Sanehiro Muromachi, Kiyofumi Suzuki, Norio Tenma
Summary: This study reports phase equilibrium data for urea + methane + water and urea + carbon dioxide + water systems, and finds that urea can be used as a thermodynamic hydrate inhibitor in subsea methane hydrate systems. The inhibition effect of urea is slightly weaker than that of methanol, but it can reach applicable hydrate inhibition temperatures under specific conditions. Based on the present equilibrium data and seafloor conditions, urea can be used for methane gas production and hydrate-based carbon capture and storage systems.
FLUID PHASE EQUILIBRIA
(2023)
Article
Chemistry, Physical
Asheesh Kumar, Hari Prakash Veluswamy, Sanat Kumar, Rajnish Kumar, Praveen Linga
Summary: Clathrate hydrate-based sustainable technologies, such as solidified natural gas (SNG) technology, show great potential for storing natural gas. Experiments on mixed hydrates in a seawater environment reveal the promotional effect of seawater on hydrate formation and suggest the economic feasibility of using natural seawater to enhance SNG technology.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Environmental
Byeonggwan Lee, Kyuchul Shin, Sanehiro Muromachi, Igor L. Moudrakovski, Christopher I. Ratcliffe, John A. Ripmeester
Summary: Antifreezes such as methanol and ammonia can enhance methane storage in binary clathrate hydrates like THF and TBAB. Methanol acts as a catalyst for methane hydrate formation and induces TBAB hydrates to form an orthorhombic structure suitable for methane storage. These findings suggest that methanol could play a crucial role in hydrate-based methane storage systems.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Satoshi Takeya, Akihiro Hachikubo, Hirotoshi Sakagami, Hirotsugu Minami, Satoshi Yamashita, Masayoshi Takahashi, Keiichi Hirano, Kazuyuki Hyodo, Akio Yoneyama
Summary: Understanding the dissolution processes of natural methane (CH4) hydrates is crucial for assessing the amount of methane released into seawater from unconventional natural gas resources. High-resolution experiments have successfully visualized the spatial relationships between methane hydrates and seawater, revealing that dissociation of methane hydrates leads to the formation of microbubbles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Environmental
Jie Xu, Qinglin Chen, Jianwei Du
Summary: Inducing pure methane hydrate from double methane semi-clathrate hydrate is a promising method to enhance methane storage efficiency. This study used a halogen-free semi-clathrate hydrate former to conduct comprehensive experiments, showing significant improvements in methane uptake.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
M. Fahed Qureshi, Vikas Dhamu, Adam Usadi, Timothy A. Barckholtz, Ashish B. Mhadeshwar, Praveen Linga
Summary: Carbon capture and sequestration is a critical method to reduce carbon footprint and achieve net-zero carbon emissions. This study examines the kinetics of CO2 hydrate formation using liquid CO2 and a green kinetic promoter, and presents a mathematical model for quantifying hydrate formation kinetics. The results show that the green kinetic promoter enhances the overall water to hydrate conversion and reduces the formation process time.
Article
Multidisciplinary Sciences
Harshal J. Dongre, Aman Deshmukh, Amiya K. Jana
Summary: Clathrate compounds with high latent heat storage capacity and naturally assisted salt rejection are suitable for load management and desalination processes. Thermodynamics can streamline scattered data, but currently limited to being a proof of concept.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Marine
Xuyang Guo, Yan Jin, Jingyu Zi, Jiaying Lin, Bolong Zhu, Qian Wen, Qi Jing
Summary: Sand production is a significant challenge in the exploitation of methane hydrates, affecting gas productivity. This study presents a numerical model that describes the coupled thermal-hydraulic-mechanical-chemical responses and sand production patterns during horizontal well depressurization in methane-hydrate-bearing sediments. The results show the spatial and temporal evolution patterns of multi-physical fields and highlight the sensitivity of gas and sand production rates to various parameters.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Xingxun Li, Cunning Wang, Qingping Li, Weixin Pang, Guangjin Chen, Changyu Sun
Summary: Understanding the mechanisms of hydrate formation and dissociation through microfluidic visualization in a porous micromodel is essential for natural gas hydrate exploration. Different methane hydrate formations and dissociation behaviors were observed, with significant differences between methane-pure water and methane-brine systems. The study also highlighted the impact of multiple formation-dissociation processes on gas-liquid interfaces and subsequent hydrate behaviors.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Energy & Fuels
Meku Maruyama, Shun Kao, Hitoshi Kiyokawa, Satoshi Takeya, Ryo Ohmura
Summary: In this study, clathrate-hydrate-based continuous CO2 capture was experimentally investigated, and it was found that the CO2 concentration rate and recovery ratio were lower compared to pre-combustion systems. However, it was revealed that improving the geometry of mixing impellers could enhance the CO2 recovery ratio for continuous operation.
Article
Chemistry, Physical
Kun Luo, Yidi Shen, Jun Li, Qi An
Summary: The stability mechanism of methane hydrate under pressure has been elucidated through molecular dynamics simulations using a quantum mechanics-derived machine-learning force field. It has been found that the decomposition behavior of methane hydrate is regulated by the stability of water cages, with the most stable methane hydrate occurring at 2 kbar. Deviation from the optimal water molecule distance due to too low or too high pressure leads to rapid deconstruction of water cages and promotes the decomposition of methane hydrates. These findings provide molecular insights into pressure-dependent decomposition of methane hydrates and have implications for the stability of other gas hydrates.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Engineering, Environmental
Yongji Wu, Yurong He, Ming Zhai, Tianqi Tang
Summary: Research shows that using wet activated carbon samples and ice induction can effectively improve the synthesis rate and storage capacity of methane hydrates. By combining certain water content, appropriate particle size of activated carbon, and suitable pressure conditions, methane hydrates with high methane storage capacity can be obtained. This innovative technology is of great significance for the development of solidified natural gas technology.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Saphir Venet, Daniel Broseta, Ross Brown
Summary: Video microscopy reveals a novel morphology and growth process of gas hydrate, promoted by a porous activated carbon substrate at a guest-host interface. The growth of hollow cyclopentane hydrate fibers is continuously fed by the flow of the guest through the substrate, even pushing the substrate away from the interface. The growth is limited by the size of the setup, overcoming the gas hydrate mass-transfer bottleneck and forming a thin impervious hydrate crust between the two phases in quiescent systems.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Engineering, Environmental
Jun Chen, Jianjian Wu, Yaosong Zeng, Zhikai Liang, Guangjin Chen, Bei Liu, Zhi Li, Bin Deng
Summary: The self-preservation effect of methane hydrate was improved by introducing deuterium oxides (D2O) as host molecules, leading to an increase in stability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Geochemistry & Geophysics
Gabriel West, Andreas Nilsson, Alexis Geels, Martin Jakobsson, Matthias Moros, Francesco Muschitiello, Christof Pearce, Ian Snowball, Matt O'Regan
Summary: This study investigates the behavior of the geomagnetic field in polar regions during the late Holocene period. By analyzing well-dated sediment cores from the Chukchi Sea, Arctic Ocean, the authors provide valuable insights into the changes in the geomagnetic field in the Arctic over the past few thousand years.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Environmental Sciences
Henrik Sward, Per Andersson, Robert Hilton, Christoph Vogt, Matt O'Regan
Summary: This article investigates the origin and composition of dolomites in Arctic Ocean sediments. The study analyzed sediments from the Mackenzie Trough and found that the dolomite content and isotopic signals remained constant in different marine units. The study suggests that the dolomite originates from the Mackenzie River, but further research is needed to confirm this.
ARCTIC ANTARCTIC AND ALPINE RESEARCH
(2022)
Article
Paleontology
T. M. Cronin, B. M. Olds, A. M. Regnier, M. O'Regan, L. Gemery, H. Detlef, C. Pearce, M. Jakobsson
Summary: By analyzing sediment properties and micropaleontology, we reconstructed Holocene paleoceanography of the Sherard Osborn Fjord and Lincoln Sea in the eastern Arctic region. The study found that there was a strong but temporally varying influence of Atlantic Water (AW) throughout the entire 10.5 kyr record of the Lincoln Sea and SOF.
MARINE MICROPALEONTOLOGY
(2022)
Article
Multidisciplinary Sciences
Boris Dorschel, Laura Hehemann, Sacha Viquerat, Fynn Warnke, Simon Dreutter, Yvonne Schulze Tenberge, Daniela Accettella, Lu An, Felipe Barrios, Evgenia Bazhenova, Jenny Black, Fernando Bohoyo, Craig Davey, Laura De Santis, Carlota Escutia Dotti, Alice C. Fremand, Peter T. Fretwell, Jenny A. Gales, Jinyao Gao, Luca Gasperini, Jamin S. Greenbaum, Jennifer Henderson Jencks, Kelly Hogan, Jong Kuk Hong, Martin Jakobsson, Laura Jensen, Johnathan Kool, Sergei Larin, Robert D. Larter, German Leitchenkov, Benoit Loubrieu, Kevin Mackay, Larry Mayer, Romain Millan, Mathieu Morlighem, Francisco Navidad, Frank O. Nitsche, Yoshifumi Nogi, Cecile Pertuisot, Alexandra L. Post, Hamish D. Pritchard, Autun Purser, Michele Rebesco, Eric Rignot, Jason L. Roberts, Marzia Rovere, Ivan Ryzhov, Chiara Sauli, Thierry Schmitt, Alessandro Silvano, Jodie Smith, Helen Snaith, Alex J. Tate, Kirsty Tinto, Philippe Vandenbossche, Pauline Weatherall, Paul Wintersteller, Chunguo Yang, Tao Zhang, Jan Erik Arndt
Summary: The Southern Ocean surrounding Antarctica is of great significance for global climate and oceanic processes, with high biological productivity and biodiversity. The collaboration between the IBCSO Project and the Nippon Foundation - GEBCO Seabed 2030 Project has led to the development of the comprehensive IBCSO v2, which serves as the most authoritative seafloor map of the area south of 50 degrees S.
Article
Geography, Physical
Per Moller, Svante Bjorck, Thomas P. F. Dowling, Dan Hammarlund, Martin Jakobsson, Karl Ljung, Martin Lund, Savvas Paradeisis-Stathis
Summary: The Siljan region in Europe hosts the largest impact structure, and a study on its deglaciation history reveals the details of ice sheet retreat and the formation process of changes in the ancient lake's water level.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Editorial Material
Chemistry, Multidisciplinary
Brett F. F. Thornton, Christian Stranne
Summary: Methane hydrate, a confounding cage compound, is causing pipeline clogging, profitability challenges, and potential climate disturbances.
Article
Geosciences, Multidisciplinary
Sergey Nikiforov, Roman Ananiev, Martin Jakobsson, Evgeny Moroz, Sergey Sokolov, Nikolay Sorokhtin, Nikolay Dmitrevsky, Elena Sukhikh, Igor Chickiryov, Yulia Zarayskaya, Anatoly Razumovskiy, Igor Semiletov
Summary: Based on data acquired during cruises of the RV Akademik Nikolaj Strakhov in 2018-2021, the distribution of submarine glacial landforms in the central part of the Pechora shelf area is revealed. The extent of the ice sheet during the Last Glacial Maximum (LGM) is proposed based on moraines and the distribution of glacial lineations. The mapped glacial landforms indicate the presence of an ice sheet in the area, while the Pechora basin was characterized by a cryogenic subaerial landscape.
Article
Environmental Sciences
Henrieka Detlef, Matt O'Regan, Christian Stranne, Mads Mork Jensen, Marianne Glasius, Thomas M. M. Cronin, Martin Jakobsson, Christof Pearce
Summary: According to climate models, the Lincoln Sea will be the last refuge of perennial Arctic sea-ice in a warming climate, but recent observations show concerns about its long-term stability. A study using marine proxy evidence reveals that perennial sea-ice disappeared in the southern Lincoln Sea during the Early Holocene, suggesting a widespread shift to seasonal sea-ice in the Arctic Ocean. The findings indicate that even if global temperature rise is limited to 2 degrees C compared to pre-industrial levels, the southern Lincoln Sea is likely to transition to seasonal sea-ice due to anthropogenic warming.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
J. Muchowski, L. Arneborg, L. Umlauf, P. Holtermann, E. Eisbrenner, C. Humborg, M. Jakobsson, C. Stranne
Summary: Diapycnal mixing affects the vertical transport rates of salt, heat, and other dissolved substances, which are crucial for the overturning circulation and ecosystem functioning in marine systems. This study investigates the overall impact of non-tidal flow over multiple small-scale bathymetric features on a strongly-stratified density interface in a coastal region. The findings highlight the importance of rough small-scale bathymetric features for the vertical transport of salt in coastal areas.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geography, Physical
Johan Nilsson, Eef van Dongen, Martin Jakobsson, Matt O'Regan, Christian Stranne
Summary: Using a conceptual model, this study investigates the impact of hydraulically controlled exchange flows in silled fjords on the relationship between glacier melt and the features of warm intermediate Atlantic Water (AW) outside the fjords. It is found that changes in the AW interface height, temperature, and glacially modified water production can force an exchange flow into the hydraulic regime. In this regime, heat transport across the sill becomes a limiting factor for basal melt and reduces its sensitivity to changes in AW temperature. The model results are compared with observations from glaciers in northern Greenland.
Article
Environmental Sciences
Christian Stranne, Matt O'Regan, Wei-Li Hong, Volker Bruchert, Marcelo Ketzer, Brett F. Thornton, Martin Jakobsson
Summary: Continental margin sediments contain large amounts of methane stored as gas hydrate. Ocean warming may release substantial amounts of methane, and the process of anaerobic oxidation of methane is often neglected in current projections. A study using a coupled model suggests that for high seafloor warming rates, the efficiency of anaerobic oxidation of methane is low, and it has a minimal mitigating effect on seafloor methane emissions.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)