scholarly journals Catalytic CO 2 Reduction with Boron‐ and Aluminum Hydrides

ChemCatChem ◽  
2019 ◽  
Vol 11 (21) ◽  
pp. 5275-5281 ◽  
Author(s):  
Daniel Franz ◽  
Christian Jandl ◽  
Claire Stark ◽  
Shigeyoshi Inoue
Keyword(s):  
Aluminum Hydrides

scholarly journals Electrolyte-Assisted Hydrogen Cycling in Lithium and Sodium Alanates at Low Pressures and Temperatures

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5868
Author(s):  
Jason Graetz ◽  
John J. Vajo
Keyword(s):  
Growth Parameters ◽  
Reaction Times ◽  
Hydrogen Uptake ◽  
Hydrogen Desorption ◽  
Reaction Rates ◽  
Rate Coefficients ◽  
Aluminum Hydrides ◽  
Dehydrogenation Reactions ◽  
Low Pressures ◽  
Sodium Alanates

An investigation of electrolyte-assisted hydrogen storage reactions in complex aluminum hydrides (LiAlH4 and NaAlH4) reveals significantly reduced reaction times for hydrogen desorption and uptake in the presence of an electrolyte. LiAlH4 evolves ~7.8 wt% H2 over ~3 h in the presence of a Li-KBH4 eutectic at 130 °C compared to ~25 h for the same material without the electrolyte. Similarly, NaAlH4 exhibits 4.8 wt% H2 evolution over ~4 h in the presence of a diglyme electrolyte at 150 °C compared to 4.4 wt% in ~15 h for the same material without the electrolyte. These reduced reaction times are composed of two effects, an increase in reaction rates and a change in the reaction kinetics. While typical solid state dehydrogenation reactions exhibit kinetics with rates that continuously decrease with the extent of reaction, we find that the addition of an electrolyte results in rates that are relatively constant over the full desorption window. Fitting the kinetics to an Avrami-Erofe’ev model supports these observations. The desorption rate coefficients increase in the presence of an electrolyte, suggesting an increase in the velocities of the reactant-product interfaces. In addition, including an electrolyte increases the growth parameters, primarily for the second desorption steps, resulting in the observed relatively constant reaction rates. Similar effects occur upon hydrogen uptake in NaH/Al where the presence of an electrolyte enables hydrogenation under more practical low temperature (75 °C) and pressure (50 bar H2) conditions.

AB-initio study of pressure-induced aluminum hydrides AAlH 4 (A = Li, Na, K, Rb, Cs)

2017 ◽  
Vol 42 (40) ◽  
pp. 25303-25309 ◽  
Author(s):  
Samira Adimi ◽  
Hadi Arabi ◽  
Shaban Reza Ghorbani ◽  
Faiz Pourarian
Keyword(s):  
Ab Initio ◽  
Ab Initio Study ◽  
Aluminum Hydrides

scholarly journals Formation of Hydrides in the Surface Layer of Aluminum in NonEquilibrium Conditions of Electrolyte Plasma

2019 ◽  
Vol 20 (2) ◽  
pp. 181-184
Author(s):  
L. Fedorenkova
Keyword(s):  
Diffusion Layer ◽  
Hydrogen Atoms ◽  
Equilibrium Conditions ◽  
Heating And Cooling ◽  
Polymorphic Modifications ◽  
High Heating ◽  
Aluminum Hydrides ◽  
Micromechanical Characteristics ◽  
Nonequilibrium Conditions ◽  
Non Equilibrium

In this paper, the formation of a diffusion layer on aluminum, which includes aluminum hydrides, in non-equilibrium conditions of electrolyte plasma with high local temperatures, high heating and cooling rates were studied. As a result of the research it was obtained that in the diffusion layer formed complex nanosized inclusions of polymorphic modifications (AlН3)n and AlB3H12. The diffusion in the non-equilibrium conditions of the electrolyte plasma is carried out in hydrogen environment, where the hydrogen atoms have the greatest energy and is one of the main forces that activate the diffusion process and influence the structure, composition and micromechanical characteristics of the diffusion layer.

Solution-processed aluminum metals using liquid-phase aluminum-hydrides

2020 ◽  
Vol 8 (40) ◽  
pp. 14007-14014
Author(s):  
Takashi Masuda ◽  
Hideyuki Takagishi
Keyword(s):  
Liquid Phase ◽  
Liquid Aluminum ◽  
Aluminum Hydride ◽  
Solution Processed ◽  
Aluminum Hydrides

Liquid-to-metal Al conversion in liquid aluminum-hydride compounds

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