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19<br />
18<br />
P (atm)<br />
17<br />
16<br />
15<br />
14<br />
0.74 %Al<br />
1.35 %Al<br />
3.38 %Al<br />
13<br />
12<br />
11<br />
10<br />
0 100 200 300 400 500 600 700 800<br />
time (s)<br />
Figure 34. Pressure profiles under 50% (v/v) H 2 :He atmosphere.<br />
Table 7. Percent hydrogen values for 50% (v/v) H 2 :He in the Parr reactor.<br />
Mole % Al P H2 , atm. Weight % H<br />
0.74 6.82 0.84<br />
1.35 8.33 1.11<br />
3.38 8.88 1.04<br />
Hydrogen capacity was higher in all samples when they were hydrided using the 50%<br />
(v/v) H 2 :He. Since the samples were analyzed using H 2 first, the increased percent<br />
hydrogen may indicate the samples were further activated by the first<br />
hydriding/dehydriding cycle.<br />
73
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