Saturation capacity, hydrogen storage

Fig. 6.10 Correlation between saturation hydrogen storage capacity and specific surface area of the adsorbent at 77 K [31].

However these strong binding sites already saturate at low hydrogen concentrations [76], and no influence of the cationic centers on the maximum storage capacity is observed at high pressures. Under these conditions the number of adsorption sites is mainly determined by the surface area. 

Figure 8.4. Water and diethylamine have both hydrogen bond donor and acceptor properties through the -OH or = NH groups. They cross-link through hydrogen bonds and can withstand considerable capillary tension. Pyridine has only hydrogen bond acceptor properties and cannot cross-link with itself. Pyridine cannot withstand large capillary forces the energy storage capacity of the pyridine-saturated system is small (Thomas and Krmgstad, 1971).

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