INVESTIGADORES
BARUJ Alberto Leonardo
artículos
Título:
Dynamic measurements of hydrogen reaction with La Ni(5-x) Sn(x) alloys
Autor/es:
E.M. BORZONE; A. BARUJ; M.V. BLANCO; G. O. MEYER
Revista:
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 38 p. 7335 - 7343
ISSN:
0360-3199
Resumen:
The study focuses on the
reaction between hydrogen gas and LaNi5-xSnx alloys,
where 0 < x < 0.5, in broad temperature and pressure ranges. It was performed by means of dynamic volumetric techniques using
specific equipment developed at our laboratory. The substitution of Ni by Sn
lowers the system equilibrium pressure and increases the hydrogen absorption reaction
rate. Reaction pressures at room temperature range from 6 kPa (x = 0.5) to 250 kPa (x = 0). At 415 K the reaction pressure is
within the range from 200 kPa to 4000 kPa for x = 0.5 and 0, respectively. The measured
characteristic absorption time at 750 kPa for LaNi5 is around 1 min,
while it remains below 2.5 s for LaNi4.5Sn0.5. The
maximum H concentration goes from 1.3 wt.% for LaNi5 down to 0.95
wt.% for LaNi4.5Sn0.5. These results are useful to
identify a metal system where the hydrogen interaction equilibrium properties
can be tuned in a wide pressure range by choosing the chemical composition and
the process temperature.