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Thesis - Oztek_Muzaffer_T_200508_MA

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1.2<br />

1.0<br />

(a)<br />

(b)<br />

Wt. % H absorbed<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

0.0<br />

0 2000 4000 6000 8000 10000 12000<br />

time (s)<br />

Figure 30: Percent hydrogen curves for LaNi 5 with 0.77% Al, hydriding under pure H 2<br />

(a) and 50% (v/v) H 2 -He (b).<br />

The decreased reaction rate of hydrogen uptake of LaNi 5 due to the presence of<br />

helium was previously reported and the rate limiting step was announced to be the<br />

transport of H 2 to the surface of the LaNi 5 [64]. This result was verified in this work.<br />

Supported with the inertness of LaNi 5 with He, the rate limiting step was verified to be<br />

the transport of H 2 from the bulk of the gas phase to the metal gas interface.<br />

66

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