Inaugural US-EU-China Thermophysics Conference-Renewable Energy 2009 (UECTC 2009 Proceedings)
52 Study of Hydrogen Storage by Adsorption on Activated Carbon
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Study of hydrogen adsorption on activated carbon storage was carried out experimentally and theoretically. Adsorption isotherms were measured at temperature-pressure range respectively from 113–293 K and 0–12.5 MPa. A lattice theory based adsorption model, modified by adsorption potential and maximum surface concentration, was used to determine the interaction energies among adsorbed hydrogen molecules. Dynamic storage tests were performed under pressures 10.5 MPa and 5.2 MPa at ambient temperature, thermal effect was evaluated by temperature and the flow rate of the storage system. Results show that molecular interaction energies evenly changed with the surface coverage at low temperature region but drastically at a higher temperature, and the charging or discharging the system under higher pressures or higher flow rates caused stronger temperature fluctuations. However, the storage system almost simultaneously reached the highest or lowest temperature under different charge and discharge pressures. Conclusions were drawn that heat transfer enhancement measures inhibiting the temperature fluctuation in initial charge and discharge states were necessary, and lowering down the storage temperature was also vital to enhancing the affinity of hydrogen molecules as well as limiting the influence from the thermal effect.