Integral treatment for materials applied to a linking stage between low (1 to 1600 kPa) and high (2100 to 3000 kPa) pressures in hydrogen thermal compression schemes

M. R. ESQUIVEL; M.G.RODRIQUEZ

Energy Materials: Materials Science & Engineering for Energy Systems

Maney Publishig CO

Lugar: Londres, Reino Unido ; Año: 2009 vol. 4 p. 145 - 149

1748-9237

 In this work, a mixture of LaNi4.60Al0.40 and La0.25Ce0.52Nd0.17Pr0.06Ni5 is mechanically milled 100 h to reach final stage. A sample of composition La0.62Ce0.12Nd0.08Pr0.03Ni4.70Al0.30 is obtained. Structures are refined using the Rietveld method. The intermetallic compound crystallizes in P6/mmm space group. Cell parameters are a = 4.978(5) Å and c = 3.997(5). It is annealed at 600 °C for 24 h in Ar to improve the microstructural and hydrogen sorption properties. The La0.62Ce0.12Nd0.08Pr0.03Ni4.70Al0.30 is intended to be used in a linking stage which joins low and high hydrogen thermal compression stages. In this link, the hydrogen is absorbed at 1550 ± 10 kPa at 25 °C reaching a maximum capacity of 1.2 % mass percent. The hydride is desorbed at 90 °C reaching an hydrogen pressure of 2260 ± 10 kPa. As a result, the material could be used to link hydrogen compression stages at lower (1 to 1600 kPa) and higher pressures (2100 to 3000 kPa) using the same temperature range.