Hydrogenation Behaviour Of La_(0.5)r_(0.5)ni_(4.8)al_(0.1)li_(0.1) (r = La, Ce, Pr Or Nd) Alloys

摘要

In the present work, we have investigated the hydrogenation properties of La_(0.5)R_(0.5) Ni_(4.8)Al_(0.1)Li_(0.1) (R = Ce, Pr or Nd) alloys under the hydrogen pressure ranging from 0.02 to 5 MPa. The pressure-composition (p-c) isotherms have been measured at four temperatures (293, 313, 333 and 353 K) in order to evaluate hydrogen absorption/desorption abilities of the alloys. For the investigated systems, the enthalpy and entropy of the dehydroge-nation process have been calculated using van't Hoff plots.