Effect of Catalyst of Iron Oxide-Carbon on Methane Hydrate Formation under Weak Stirring Condition

Takahata, Mutsumi; Kashiwaya, Yoshiaki; Ouchi, M; Ishii, Kuniyoshi

doi:10.2355/tetsutohagane1955.92.6_393

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…Since the formation rate of gas hydrate decreases dramatically in the absence of stirring, the capacity of a gas hydrate tank becomes very large. To avoid equipment complication (installation of a stirrer into the high pressure airtight container) and to decrease power consumption of the stirrer, a catalyst that improves the formation rate of methane hydrate [24] was used in this study. Referring to the study of Takahata et al [24], to prepare the powdered catalyst, ferrous oxide is sintered in an electric furnace (1000 C) for 24 h, and 50.0 g of the ferrous oxide and 14.3 g of graphite were milled at a mixture ratio of O/C ¼ 1.0 for 48 h (Fig.…”

Section: Optimization Of the Formation Rate Of Co 2 Hydratesmentioning

confidence: 99%

Development of a compound energy system for cold region houses using small-scale natural gas cogeneration and a gas hydrate battery

Obara

Kikuchi

Ishikawa

et al. 2015

Energy

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Section: Optimization Of the Formation Rate Of Co 2 Hydratesmentioning

confidence: 99%

Development of a compound energy system for cold region houses using small-scale natural gas cogeneration and a gas hydrate battery

Obara

Kikuchi

Ishikawa

et al. 2015

Energy

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“…We define the present stirring conditions as intense, in contrast to the previous stirring mechanism, 11) which used a magnetic stirrer and which was stopped by blockage from hydrate formation.…”

Section: Methodsmentioning

confidence: 99%

“…The milling conditions and the details of the phenomena during milling have been discussed in previous papers. [11][12][13][14][15] Distilled water (70 cm 3 ) and catalyst (iron oxide and/or carbon 0.1 g) were put into a stainless steel reaction vessel (5 cm in diameter). Then, the vessel was evacuated with a vacuum pump, and methane gas was pressurized up to 6.0 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…As the active surface can be a nucleation site for some reactions, the possibility of iron and carbon acting as a catalyst was examined in a previous study. 11) If iron oxide and carbon can be used as a catalyst, they will have a low environmental influence and a relatively low cost. In the previous study, 11) it was shown that carbon and iron oxide can act as a catalyst even under weak stirring conditions.…”

Section: Introductionmentioning

confidence: 99%

“…11) If iron oxide and carbon can be used as a catalyst, they will have a low environmental influence and a relatively low cost. In the previous study, 11) it was shown that carbon and iron oxide can act as a catalyst even under weak stirring conditions. Thus, in the present study, an experiment involving intense stirring was conducted to determine the feasibility of establishing a high production system.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Methane Hydrate Formation Catalyzed by Iron Oxide and Carbon under Intense Stirring Conditions

2010

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As an active surface can be a nucleation site for some reactions, the possibility of iron and carbon acting as a catalyst for methane hydrate formation has been examined in the previous study. If iron oxide and carbon can be used as a catalyst, they would have a low environmental influence and a relatively low cost. It has previously been shown that carbon and iron oxide can be used as a catalyst under weak stirring conditions. In the present study, experiments involving intense stirring were conducted for the establishment of the basis for a high production system. The proposed reaction model consisted of the mass transfers of CH 4 in the liquid films both at the gas-liquid and the liquid-solid interfaces and the diffusion in liquid water, and a chemical reaction at the liquid-solid interface. The kinetic analysis was performed using the model and the following results were obtained.The reaction was a mixed control between the mass transfer and the chemical reaction at 277 K, which was closed to the maximum temperature of methane hydrate formation thermodynamically. While in the lower temperature region lower than 275 K, the mass transfer including the diffusion of CH 4 and the apparent mass transfers in the liquid films, k 0 s was dominant. The addition of catalysts (hematite, graphite and its mixture) had acceleration effects on hydrate formation, but to varying degrees. The catalyst ''Mix'' (mixture of hematite and graphite) had the largest effect on hydrate formation over the whole stirring range. From the results of kinetic analysis, the existence of catalyst had a relatively large influence on the chemical reaction of the formation of methane hydrate.

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CO2 hydrate heat cycle using a carbon fiber supported catalyst for gas hydrate formation processes

Kawasaki

Obara

2020

Applied Energy

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Effect of Catalyst of Iron Oxide-Carbon on Methane Hydrate Formation under Weak Stirring Condition

Cited by 6 publications

References 12 publications

Development of a compound energy system for cold region houses using small-scale natural gas cogeneration and a gas hydrate battery

Development of a compound energy system for cold region houses using small-scale natural gas cogeneration and a gas hydrate battery

Kinetics of Methane Hydrate Formation Catalyzed by Iron Oxide and Carbon under Intense Stirring Conditions

CO2 hydrate heat cycle using a carbon fiber supported catalyst for gas hydrate formation processes

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