Hydrogen generation performance of Al-20at%Ca alloy synthesized by mechanical alloying
Por:
Hernandez-Torres, A. G., Lopez-Miranda, J. L., Santos-Ramos, I, Rosas, G.
Publicada:
1 ene 2020
Categoría:
Materials science (miscellaneous)
Resumen:
In this study, the Al-20at%Ca alloy was synthesized by mechanical alloy
from the elemental powder mixture. Subsequently, the alloy particles
were reacted at room temperature to determine the amount of hydrogen
released. For these purposes, the powders reacted with different types
of water, such as distilled water, tap water, and seawater, and also in
the presence of NaCl and CaO additives. Both milled samples and reaction
powders were analyzed by X-ray diffraction (XRD), scanning electron
microscopy (SEM), transmission electron microscopy (TEM), FT-IR, and
Raman spectroscopy (RS). The XRD patterns of the powders prepared show a
nanocrystalline alloy consisting of a solid-cubic solution of Al and the
tetragonal intermetallic phase CaAl4. Studies of XRD and SEM, as well as
direct measurements of H-2, indicated that the best results of H-2
generation were obtained when the alloy reacts with distilled water.
Both NaCl and CaO additives improve hydrogen generation, reaching 100%
efficiency in distilled water and seawater, and without induction time.
Samples with a combination of NaCl and distilled water showed the best
reaction times to generate the entire theoretical amount of hydrogen.
The XRD and DSC-TGA standards also confirmed the presence of bayerite
Al(OH)(3 )as a secondary reaction product.
Filiaciones:
UNAM Circuito Exterior, Fac Quim, Ciudad Univ, Mexico City 04510, DF, Mexico
UNAM, Ctr Fis Aplicada & Tecnol Avanzada, Boulevar Juriquilla 3001, Santiago De Queretaro 76230, Qro, Mexico
UMSNH, Inst Invest Metalurgia & Mat, Edificio U,Ciudad Univ, Morelia 58060, Michoacan, Mexico
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