Abstract
The effect of CH 4 upon the kinetics of the absorption of hydrogen by LaNi 5H x suspended in n-undecane was determined at two different gas compositions: 5 and 25 mol.% CH 4 in H 2. The systems behave similarly to those studied in the absence of CH 4 and the same rate equation holds. The rate-limiting process is dissolution of hydrogen in the liquid phase. The activation energy for this process, E s , varied with CH 4 pressure; at 40 kPa, E s = 9.3 ±0.5 kJ (mol H 2) −1, at 253 kPa, E s = 5.5 ±0.9 kJ (mol H 2) −1. The pre-exponential factor in the rate equation is reduced by the presence of CH 4; however, the absorption rate is very little changed relative to pure hydrogen in the gas phase because of the lower E s . The reduction of E s is attributed to the dissolution of CH 4 in the liquid phase and a consequent lowering of its surface tension.
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