Absorption of Hydrogen in LaNi_4.75Al_0.25/n-Octane Slurries

Abstract

The absorption kinetics of hydrogen into a LaNi 4.75 Al 0.25 /n-octane slurry was investigated in a stirred reactor. The rate-determining step was hydrogen absorption into the liquid n-octane phase in agreement with the model proposed by Reilly and Johnson (J. Less-Common Met. 1984, 104, 175). The activation energy was found to be approximately 8.4 kJ/mol of H 2 . Although the activation energies for hydrogen absorption into various slurry combinations are quite scattered, the data reported here indicate that the overall kinetics is sufficient for many practical applications.

Experimental study of a metal hydride driven braided artificial pneumatic muscle

“…Metal hydrides can store large amounts of hydrogen via nearly reversible chemisorption and subsequent bulk hydriding phase transformations. The hydriding reaction is accompanied by enthalpy changes, permitting a number of thermal energy transformation processes to be envisioned [1][2][3][4][5][6][7][8]. Although metal hydrides are usually dense alloys, their relatively high mass is largely offset by their high storage capacity.…”

“…The data used for the differential length with respect to time relation is from the weight set-up test with the maximum allowable suspended load. The data was chosen because using the maximum suspended load produced the most work over the desorption cycle, when work was calculated using equation (6).…”