Thesis - Oztek_Muzaffer_T_200508_MA

percent hydrogen was decreased. The amount of H absorbed was found to be dependent
on the initial pressure of H 2 .
Table 4. Dependence of percent hydrogen absorbed on partial pressure of H 2 .
Atmosphere P H2 , atm. Wt. % H
LaNi 5
H 2 5.11 1.02
50% (v/v) H 2 -He 3.33 0.36
0.77 mol % Al in LaNi 5
H 2 5.60 1.05
50% (v/v) H 2 -He 3.30 0.33
50% (v/v) H 2 -He 5.10 0.90
4.74 mol % Al in LaNi 5 H 2 5.07 0.97
50% (v/v) H 2 -He 3.35 0.35
50% H 2 -He - -
12.00 mol % Al in LaNi 5
H 2 5.27 0.80
50% (v/v) H 2 -He 3.37 0.15
50%(v/v) H 2 -He 5.10 0.59
The percent hydrogen curve for the sample with 0.77% Al (Figure 30) at 5 atm of
H 2 indicated a decreased reaction rate with the presence of helium. The completion time
for the reaction dropped from about 10 minutes to 120 minutes.
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