Cost-Effective Hierarchical Catalysts for Promoting Hydrogen Release from Complex Hydrides.
ChemSusChem
; 8(16): 2713-8, 2015 Aug 24.
Article
em En
| MEDLINE
| ID: mdl-26150091
ABSTRACT
Fe nanoparticles (â¼10â
nm), used to grow carbon nanotubes (CNTs), have an outstanding ability to catalyze the dehydrogenation of LiAlH4 . The CNTs help connect Fe and LiAlH4 and create microchannels among the composite, thus promoting the release of hydrogen. Inspired by these results, a supercritical-CO2 -fluid-assisted deposition technique is employed to decorate the Fe/CNTs with highly dispersed nanosized Ni (â¼2â
nm in diameter) for better performance. With the incorporation of 10â
wt % of this hierarchical catalyst (Ni/Fe/CNTs), the initial dehydrogenation temperature of LiAlH4 is decreased from â¼135 to â¼40 °C. At 100 °C, this catalyzed LiAlH4 takes only â¼0.1â
h to release 4.5â
wt % hydrogen, which is more than 100 times faster than the time needed with pristine LiAlH4 . The dehydrogenation mechanism of the complex hydride is examined using inâ
situ synchrotron X-ray diffraction.
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Base de dados:
MEDLINE
Assunto principal:
Compostos de Lítio
/
Compostos de Alumínio
/
Nanotubos de Carbono
/
Hidrogênio
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article