Adsorption-Based Hydrogen Storage in Activated Carbons and Model Carbon Structures
| Autor: | A. G. Ishkov, A. A. Fomkin, E. V. Khozina, A. V. Shkolin, O. E. Aksyutin, Konstantin V. Romanov, I. E. Men’shchikov, Anatoly Pribylov |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen thermodynamics of adsorption chemistry.chemical_element 02 engineering and technology 010402 general chemistry microporous activated carbons 01 natural sciences chemistry.chemical_compound Hydrogen storage Adsorption Silicon carbide QD1-999 model porous structure General Environmental Science hydrogen adsorption theory of volume filling of micropores Nanoporous Atmospheric temperature range 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry chemistry Chemical engineering General Earth and Planetary Sciences Polymer blend 0210 nano-technology Carbon |
| Zdroj: | Reactions Volume 2 Issue 3 Pages 14-226 Reactions, Vol 2, Iss 14, Pp 209-226 (2021) |
| ISSN: | 2624-781X |
| DOI: | 10.3390/reactions2030014 |
| Popis: | The experimental data on hydrogen adsorption on five nanoporous activated carbons (ACs) of various origins measured over the temperature range of 303–363 K and pressures up to 20 MPa were compared with the predictions of hydrogen density in the slit-like pores of model carbon structures calculated by the Dubinin theory of volume filling of micropores. The highest amount of adsorbed hydrogen was found for the AC sample (ACS) prepared from a polymer mixture by KOH thermochemical activation, characterized by a biporous structure: 11.0 mmol/g at 16 MPa and 303 K. The greatest volumetric capacity over the entire range of temperature and pressure was demonstrated by the densest carbon adsorbent prepared from silicon carbide. The calculations of hydrogen density in the slit-like model pores revealed that the optimal hydrogen storage depended on the pore size, temperature, and pressure. The hydrogen adsorption capacity of the model structures exceeded the US Department of Energy (DOE) target value of 6.5 wt.% starting from 200 K and 20 MPa, whereas the most efficient carbon adsorbent ACS could achieve 7.5 wt.% only at extremely low temperatures. The initial differential molar isosteric heats of hydrogen adsorption in the studied activated carbons were in the range of 2.8–14 kJ/mol and varied during adsorption in a manner specific for each adsorbent. |
| Databáze: | OpenAIRE |
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