Hydrogen Storage in Silica

Subsequently, using the Gurvich rule [2], it is possible to obtain the relation Nm = W/VNH3, which allows the calculation of the maximum amount of NH3 that could be adsorbed in the stabilized silica samples. Then, the maximum amount of NH3 that could be adsorbed in both samples is approximately Nm = 40.1 mmol/g. Since each molecule of ammonia contains three hydrogen atoms, 0.120 grams of hydrogen is stored in the form of NH3 per gram of the silica adsorbent, that is, 0.120 g/g. 

FIGURE 6.27 Semilogarithmic plot of the N2 adsorption isotherm at 77K on both samples 70bs2-a-s(25) and 70bs2-a-s(50). 

The Physical Chemistry of Materials Energy and Environmental Applications 

FIGURE 6.28 Semi-logarithmic plot of the NH3 adsorption at 300K on both samples 70bs2-s(25) and 70bs2-s(50). 

the maximum amount of hydrogen stored in the adsorbent in the form of NH3 will be about 11 wt %, a quantity higher than the established minimum figure of 6.5 wt %. 

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