Sanehiro Muromachi

National Institute of Advanced Industrial Science and Technology

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Satoshi Takeya

National Institute of Advanced Industrial Science and Technology

Ryo Ohmura

Keio University

Yoshitaka Yamamoto

National Institute of Advanced Industrial Science and Technology

John A. Ripmeester

National Research Council Canada

Saman Alavi

University of Ottawa

Akio Yoneyama

SAGA Light Source

Hidenori Hashimoto

National Institute of Advanced Industrial Science and Technology

Kazuyuki Hyodo

High Energy Accelerator Research Organization

Hiroyuki Miyamoto

ISCO International (United States)

Kenji Yasuoka

Keio University

Cooperative Institutions

National Institute of Advanced Industrial Science and Technology

Keio University

National Research Council Canada

Steacie Institute for Molecular Sciences

Centre National de la Recherche Scientifique

The University of Tokyo

Mines Saint-Étienne

Georges Friedel Laboratory

University of Tsukuba

Toyama Prefectural University

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Thermodynamic modeling for clathrate hydrates of ozone

The Journal of Chemical Thermodynamics (2013)

Sanehiro Muromachi Hironori D. Nagashima Jean‐Michel Herri Ryo Ohmura

Clathrate hydrate

Fugacity

10.1016/j.jct.2013.05.020

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Citations (9)

Superheating of Structure I Gas Hydrates within the Structure II Cyclopentane Hydrate Shell

The Journal of Physical Chemistry Letters (2022)

Satoshi Takeya Sanehiro Muromachi Akio Yoneyama K. Hirano Kazuyuki Hyodo

The superheated state of methane (CH4) hydrate that exists under the surface ice layer can persist for considerable lengths of time, which showed promise as a method for storing and transporting natural gas. This study extends this further by coating sI CH4 hydrate with one of several sII hydrates, thus eliminating the need for a defect-free continuous interface between the sI and sII hydrates. Gas hydrate crystals were kept intact above their dissociation temperature by immersing them in liquid cyclopentane (CP), as observed with powder X-ray diffraction and X-ray CT methods. It was observed that placing the CH4 hydrate in CP converted the outer layer of CH4 hydrate to a thin layer of CP hydrate at around 270 K under atmospheric pressure, which is ∼80 K higher than the usual dissociation temperature. It was also observed that sI CO2 hydrate and C2H6 hydrate could be preserved by CP hydrate.

Cyclopentanes

Clathrate hydrate

10.1021/acs.jpclett.2c00264

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Citations (13)

Discovery of the final primitive Frank-Kasper phase of clathrate hydrates

Sanehiro Muromachi Satoshi Takeya

In weakly bound materials such as water, one of the three primitive Frank-Kasper (FK) phases, the Z phase, is long absent due to the relatively unstable framework. The Z phase in clathrate hydrate, which is known as the HS-I structure, has now been discovered by precise tuning of the molecular guest structure. In the crystal structure, the never stabilized combination water cage of two 15-hedra and two 14-hedra formed with its original symmetries, providing sufficient gas capacity to the 12-hedral cages. With the discovery of the final FK clathrate hydrate, guest design now enables engineering of weak interactions in any mix of the three, illuminating how to leverage properties of clathrates in the broadest sense.

Clathrate hydrate

10.26434/chemrxiv-2024-5nt0d-v2

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Citations (1)

Microstructural investigation of morphology and kinetics of methane hydrate in the presence of tetrabutylammonium bromide: Insights for preservation and inhibition

The Journal of Chemical Physics (2024)

Satoshi Takeya Sanehiro Muromachi Michihiro Muraoka Kiyofumi Suzuki Norio Tenma

Developing highly efficient methane (CH4) hydrate storage methods and understanding the hydrate dissociation kinetics can contribute to advancing CH4 gas storage and transport. The effects of tetrabutylammonium bromide (TBAB) (a thermodynamic promoter) addition on the kinetics of CH4 hydrate were evaluated on the microscopic scale using synchrotron x-ray computed tomography (CT) and powder x-ray diffraction. Microscopic observations showed that a 5 wt. % TBAB solution facilitated the nucleation of CH4 hydrate owing to the initial growth of TBAB semi-clathrate hydrate particles. The CH4 hydrate crystals in the CH4 + TBAB hydrate sample were sponge-like with many internal pores and exhibited slightly enhanced self-preservation compared to the pure CH4 hydrate, both in the bulk and after pulverization to a fine powder. This study demonstrates the feasibility of controlling the rate of CH4 hydrate formation and preservation by using aqueous TBAB solutions in CH4 hydrate formation.

Clathrate hydrate

10.1063/5.0202418

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Citations (1)

Phase equilibrium for ozone-containing hydrates formed from an (ozone + oxygen) gas mixture coexisting with gaseous carbon dioxide and liquid water

The Journal of Chemical Thermodynamics (2012)

Sanehiro Muromachi Ryo Ohmura Yasuhiko H. Mori

Mole fraction

Clathrate hydrate

Fraction (chemistry)

Atmospheric temperature range

10.1016/j.jct.2012.01.009

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Citations (19)

Phase equilibrium and characterization of ionic clathrate hydrates formed with tetra- n -butylammonium bromide and nitrogen gas

Fluid Phase Equilibria (2015)

Sanehiro Muromachi Hidenori Hashimoto Tatsuo Maekawa Satoshi Takeya Yoshitaka Yamamoto

Clathrate hydrate

Orthorhombic crystal system

Mole fraction

Mass fraction

10.1016/j.fluid.2015.09.002

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Citations (38)

Guest size effects on a robust structure of semiclathrate hydrates and their thermophysical properties

Physical Chemistry Chemical Physics (2023)

Sanehiro Muromachi Satoshi Takeya

The ability to tune the pore size, shape, and functionality of semiclathrate hydrates, host-guest materials formed from aqueous solutions of ionic guest materials and water, makes them attractive materials for thermal storage and gas storage applications. The flexibility of semi-clathrate hydrates and their guest-molecule-dependent reactions produce these unexpected and desirable properties. As an ionic guest, tetra-

Clathrate hydrate

10.1039/d3cp04252a

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Citations (1)

X-ray Imaging of Clathrate Hydrates as Gas Storage Materials: Absorption Contrast of Low-Density and Low-Absorption Materials Using Energy-Dependent X-ray Computed Tomography

Energy & Fuels (2022)

Satoshi Takeya Sanehiro Muromachi Akio Yoneyama

Non-destructive observations are useful for analyzing objects embedded in structures, but characterizations of low-density materials co-existing with liquid water or ice are difficult, owing to insufficient contrast produced by X-ray computed tomography (CT). This study demonstrates the contrast between the absorption contrast X-ray images of clathrate hydrates and water as a function of the X-ray energy using monochromatic X-rays. Quantitative characterization of the contrast change in the absorption contrast X-ray CT of resins and clathrate hydrates indicates that X-ray CT measurements using monochromatic X-rays are advantageous for the segmentation of carbon dioxide hydrates co-existing with ice but not for methane or tetrahydrofuran hydrates. This can help in the application of absorption contrast X-ray imaging to previously challenging three-dimensional (3D) studies on gas storage processes in materials, such as shale or active carbon, based on their macroscopic 3D structures.

Clathrate hydrate

Monochromatic color

10.1021/acs.energyfuels.2c01319

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Citations (17)

Thermodynamic Properties and Crystallographic Characterization of Semiclathrate Hydrates Formed with Tetra-n-butylammonium Glycolate

ACS Omega (2019)

Sanehiro Muromachi Satoshi Takeya

Semiclathrate hydrates are a crystalline host-guest material, which forms with water and ionic substances such as tetra-n-butylammonium (TBA) salts. Various anions can be used as a counter anion to the TBA cation, and they can modify thermodynamic properties of the semiclathrate hydrates, which are critical for applications, for example, cold energy storage and gas separation. In this study, the semiclathrate hydrates of the TBA glycolate were newly synthesized. Measurements for melting temperatures and a heat of fusion and a crystal structure analysis were performed. In comparison with the other similar materials, such as acetates, propionates, lactates, and hydroxybutyrates, the glycolate greatly changed the melting temperature and the heat of fusion. The preliminarily determined crystal structure showed that the glycolate anion builds a relatively porous structure compared to the previously reported hydrates formed with hydroxycarboxylates. The present study showed that substitution of a hydrophobic group by a hydrophilic group is an effective method to control the thermodynamic properties as well as to improve environmental, biological, and chemical properties.

Tetra

Characterization

Clathrate hydrate

10.1021/acsomega.9b00422

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Citations (20)

CCDC 2045524: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

Sanehiro Muromachi Hassan Sharifi Saman Alavi John A. Ripmeester Peter Englezos

10.5517/ccdc.csd.cc26njn2

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Citations (0)