Hydrogen storage in activated carbons produced from coals of different ranks: Effect of oxygen content |
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| Authors: | MC Tellez-Juárez V Fierro W Zhao N Fernández-Huerta MT Izquierdo E Reguera A Celzard |
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| Affiliation: | 1. Institut Jean Lamour, UMR CNRS 7198, ENSTIB, 27 rue Philippe Séguin, CS 60036, 88026 Epinal cedex, France;2. Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada del Instituto Politécnico Nacional, Unidad Legaria, Legaria 694, Col. Irrigación, México, D. F., Mexico;3. Université de Lorraine, ENSTIB, 27 rue Philippe Séguin, CS 60036, 88026 Epinal cedex, France;4. College of Material Engineering, Fujian Agriculture & Forestry University, Fuzhou, Fujian 350002, China;5. Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán, 4, 50018 Zaragoza, Spain |
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| Abstract: | 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 °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 m2 g−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 °C. |
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| Keywords: | Hydrogen storage Activated carbon KOH activation Oxygen content |
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