Hydrogen storage in activated carbons produced from coals of different ranks: Effect of oxygen content

20 activated carbons (ACs) were prepared by activation of four coals of different ranks (bituminous, low-ash bituminous and sub-bituminous coals, and one anthracite) with potassium hydroxide, in order to evaluate their hydrogen storage capacities at -196 degree C. The effect of surface area and oxyg...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-03, Vol.39 (10), p.4996-5002
Main Authors: TELLEZ-JUAREZ, M. C, FIERRO, V, ZHAO, W, FERNANDEZ-HUERTA, N, IZQUIERDO, M. T, REGUERA, E, CELZARD, A
Format: Article
Language:English
Subjects:
Acoustics
Alternative fuels. Production and utilization
Analysis of variance
Applied sciences
Bituminous
Bituminous coal
Chemical Sciences
Coal
Condensed Matter
Electromagnetism
Energy
Engineering Sciences
Exact sciences and technology
Fuels
Hydrogen
Hydrogen storage
Material chemistry
Materials
Materials Science
Mechanics
Mechanics of materials
Oxygen content
Physics
Polymers
Surface area
Surface chemistry
Thermics
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Summary:20 activated carbons (ACs) were prepared by activation of four coals of different ranks (bituminous, low-ash bituminous and sub-bituminous coals, and one anthracite) with potassium hydroxide, in order to evaluate their hydrogen storage capacities at -196 degree C. The effect of surface area and oxygen content on hydrogen storage was examined. Oxygen content was determined by temperature-programmed desorption. The significance of oxygen content on hydrogen storage capacity was evaluated by Analysis of Variance (ANOVA). Apparent surface areas higher than 3000 m super(2) g super(-1) and hydrogen adsorption as high as 6.8 wt.% were obtained. The best results were obtained with ACs from bituminous coals. No significant effect of oxygen content on hydrogen adsorption was observed. We concluded that surface area controls hydrogen storage capacity at -196 degree C.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.01.071