Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
1.0<br />
0.8<br />
(a)<br />
(b)<br />
Wt. % H absorbed<br />
0.6<br />
0.4<br />
0.2<br />
(c)<br />
0.0<br />
-0.2<br />
0 2000 4000 6000 8000 10000 12000<br />
time (s)<br />
(a) non-coated, under H 2<br />
(b) AuPd coated, under 50% (v/v) H 2 -He<br />
(c) non-coated, under 50% (v/v) H 2 -He<br />
Figure 31. Percent hydrogen curves for rate comparison of AuPd coated and non-coated<br />
samples.<br />
The effect of Pt coating on the rate of reaction is presented in the percent<br />
hydrogen plots given in Figure 32. The time to completion of the reaction of the Pt coated<br />
sample with H 2 was about 1 hour which was lower than the 3 hour reaction time for the<br />
non-coated sample. Pt coating increased the reaction rate and capacity of LaNi 5 samples,<br />
which suggested the surface affinity of H 2 was enhanced. This could be due to the high<br />
solubility of H 2 in Pt.<br />
69
Change language