Hydrogen Sorption Properties of the Complex Hydride Mg2FeH6 Consolidated by HPT

2010 ◽  
Vol 667-669 ◽  
pp. 1053-1058 ◽  
Author(s):  
Gisele Ferreira De Lima ◽  
Daniel Rodrigo Leiva ◽  
Tomaz Toshimi Ishikawa ◽  
Claudemiro Bolfarini ◽  
Claudio Shyinti Kiminami ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Activation Barrier ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Sorption Properties ◽  
Hydrogen Sorption ◽  
Powder Form ◽  
Reactive Milling ◽  
Bulk Nanocrystalline

In the present work, we have processed 2Mg-Fe mixtures by reactive milling (RM) under hydrogen atmosphere to synthesize Mg2FeH6 phase in the powder form which were then systematically processed by High Pressure Torsion (HPT) to produce bulk samples. The bulk samples were characterized in terms of microstructural and structural analyses and of hydrogen desorption properties. The hydrogen sorption properties after HPT processing was evaluated in comparison with the Mg2FeH6 powder obtained by RM and with commercial MgH2. HPT processing of Mg2FeH6 can produce bulks with a high density of defects that drastically lower the activation barrier for hydrogen desorption. Therefore, the bulk nanocrystalline Mg2FeH6 samples show endothermic hydrogen decomposition peak at a temperature around 320°C. In addition, when compared with the Mg2FeH6 and MgH2 powders, the Mg2FeH6 HPT disks showed the same results presented by the Mg2FeH6 powders and certainly decreases the onset transition temperature by as much as 160°C when compared with the MgH2 powders.

Crystallitic Structure and Thermodynamics of Magnesium-Based Hydrogen Storage Materials from Reactive Milling under Hydrogen Atmosphere

2013 ◽  
Vol 724-725 ◽  
pp. 1021-1024
Author(s):  
Shi Xue Zhou ◽  
Qian Qian Zhang ◽  
Nai Fei Wang ◽  
Zong Ying Han ◽  
Wei Xian Ran ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Xrd Analysis ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Reactive Milling ◽  
Anthracite Coal ◽  
Enthalpy And Entropy Changes ◽  
Hoff Equation

Magnesium-based hydrogen storage materials were prepared by reactive milling of magnesium under hydrogen atmosphere with crystallitic carbon, prepared from anthracite coal, as milling aid. The XRD analysis shows that in the presence of 30 wt.% of crystallitic carbon, the Mg easily hydrided into β-MgH2of crystal grain size 29.7 nm and a small amount of γ-MgH2after 3 h of milling under 1 MPa H2. The enthalpy and entropy changes of the hydrogen desorption reaction are 42.7 kJ/mol and 80.7 J/mol K, respectively, calculated by the vant Hoff equation from thep-C-Tdata in 300-380°C.

Hydrogen Sorption Properties of Mg—1 wt.% Ni—0.2 wt.% Pd Prepared by Reactive Milling.

ChemInform ◽  
2006 ◽  
Vol 37 (11) ◽  
Author(s):  
O. Gutfleisch ◽  
S. Dal Toe ◽  
M. Herrich ◽  
A. Handstein ◽  
A. Pratt
Keyword(s):  
Sorption Properties ◽  
Hydrogen Sorption ◽  
Reactive Milling

Bulk nanocrystalline gamma magnesium hydride with low dehydrogenation temperature stabilized by plastic straining via high-pressure torsion

2018 ◽  
Vol 157 ◽  
pp. 54-57 ◽  
Author(s):  
Kaveh Edalati ◽  
Kouki Kitabayashi ◽  
Yuji Ikeda ◽  
Junko Matsuda ◽  
Hai-Wen Li ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Magnesium Hydride ◽  
Bulk Nanocrystalline

Hydrogen sorption properties of Mg–1 wt.% Ni–0.2 wt.% Pd prepared by reactive milling

2005 ◽  
Vol 404-406 ◽  
pp. 413-416 ◽  
Author(s):  
O. Gutfleisch ◽  
S. Dal Toè ◽  
M. Herrich ◽  
A. Handstein ◽  
A. Pratt
Keyword(s):  
Sorption Properties ◽  
Hydrogen Sorption ◽  
Reactive Milling

scholarly journals Hydrogen Sorption Properties, Thermal Stability and Kinetics of Hydrogen Desorption From the Hydride Phase of The MgH2 of a Mechanical Alloys of Magnesium with Ti, Ni and Y

2020 ◽  
Vol 21 (1) ◽  
pp. 167-175
Author(s):  
O. G. Ershova ◽  
V. D. Dobrovolsky ◽  
Yu. M. Solonin
Keyword(s):  
Thermal Stability ◽  
Thermodynamic Stability ◽  
Hydrogen Desorption ◽  
Sorption Properties ◽  
Hydrogen Sorption ◽  
Hydride Phase ◽  
Phase Content ◽  
Stability Kinetics ◽  
Kinetics Of

The mechanical alloys-composite MАs (Mg +10 % wt.Ti + 5 % wt.Y and Mg +10 % wt.Ni + 5 % wt.Y) were synthesized. The phase content, microstructure, the thermal stability, kinetics of hydrogen desorption from the MgH2 hydride phase of the obtained MAs were studiedby using XRD, SEM, TDS methods. It has been established that the addition of Ti + Y and Ni + Y to magnesium leads to significant improvement in the kinetics of hydrogen desorption from the  MgH2 hydride phase, which is evidenced by a significant reduction (in 6 and 15 times)in the time of release of all hydrogen from MA1 and MA2, respectively. Due to, Ti, Ni,Y alloying, the decrease in the thermodynamic stability of MgH2 is not found.

Bulk nanocrystalline ω-Zr by high-pressure torsion

2008 ◽  
Vol 58 (3) ◽  
pp. 219-222 ◽  
Author(s):  
M.T. Pérez-Prado ◽  
A.A. Gimazov ◽  
O.A. Ruano ◽  
M.E. Kassner ◽  
A.P. Zhilyaev
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Bulk Nanocrystalline

The Study of Hydrogen Sorption Properties of Mg17Al12La0.45

2011 ◽  
Vol 311-313 ◽  
pp. 1351-1356
Author(s):  
Li Juan Pang ◽  
Yun Gui Chen ◽  
Chao Ling Wu ◽  
Xue Feng Zhang ◽  
Gang Deng
Keyword(s):  
Ball Milling ◽  
Hydrogen Desorption ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Sorption Properties ◽  
Hydrogen Sorption ◽  
Ball Milling Process ◽  
Energy Ball ◽  
Ball Milling Technique

Mg17Al12and rare earth improved Mg17Al12La0.45alloys were prepared by resistance melting method. The hydrogen sorption properties of the alloys with and without ball-milling process were investigated with the help of PCT measurements. The phase compositions of the experimental alloys were determined through powder X-Ray diffraction. It is found that the introduction of La and the high energy ball-milling technique could remarkably improve the hydrogen sorption capability of Mg17Al12. For Mg17Al12La0.45alloy, the hydrogen absorption starts at 473K and the hydridying rate increases at each temperature (573K, 523K, 473K) after high energy ball-milling process. The hydrogen desorption capacity of this alloy is 4wt% at 573K. XRD shows that there are two phases Mg17Al12and Al2La0.15Mg0.85after melting and Al2La0.15Mg0.85phase always exists during hydrogen sorption cycles of Mg17Al12La0.45.

scholarly journals Effect of Al, Fe Addition on Thermodynamic Stability and Hydrogen Desorption KInetics from MgH2 Phase OF Mechanical Alloy

2015 ◽  
Vol 16 (3) ◽  
pp. 576-585 ◽  
Author(s):  
О.G. Еrshova ◽  
A.Yu. Koval ◽  
Yu.М. Solonin ◽  
V.D. Dobrovolsky
Keyword(s):  
Mechanical Alloy ◽  
Mechanochemical Synthesis ◽  
Thermodynamic Stability ◽  
Thermal Desorption Spectroscopy ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Desorption Kinetics ◽  
Reactive Milling ◽  
Kinetics Of ◽  
Complex Doping

With the aim of lowering the temperature, improve the kinetics of the decomposition of stoichiometric hydride MgH2 was investigated the possibility of its complex doping Al, Fe using mechanochemical synthesis (RMS). The MA1 sample was derived by reactive milling  Mg + 10 wt% Al + 10 wt. % Fe powder mixture in the hydrogen atmosphere at pressure of 1.2 MPa in a reactor for 10 h. The formation (in conditions of mechanochemical synthesis) of hydride of solid solution of Al and Fe in magnesium Mg(Al,Fe)H2 was experimentally checked. Found that adding to magnesium Al & Fe leads to lower of thermodynamic stability and, consequently, to lower the temperature of the beginning of desorption of hydrogen to 250 0C at 0,1MPa H2 (compared to MgH2 without Al and Fe). After the first cycles of hydrogenation-dehydrogenation from gas phase MA, established by isobaric thermal desorption spectroscopy, the effect of lowering the temperature of the beginning desorbtion 315 0C (for non-alloy phase MgH2) to 250 0C was observed. Adding to magnesium aluminum with Fe significantly improves the kinetics of desorption of hydrogen from the hydride phase MgH2 mechanical alloy produced by RMS.

Nanoscale Grain Refinement and H-Sorption Properties of MgH2 Processed by High-Pressure Torsion and Other Mechanical Routes

2010 ◽  
Vol 12 (8) ◽  
pp. 786-792 ◽  
Author(s):  
Daniel Rodrigo Leiva ◽  
Alberto Moreira Jorge ◽  
Tomaz Toshimi Ishikawa ◽  
Jacques Huot ◽  
Daniel Fruchart ◽  
...  
Keyword(s):  
High Pressure ◽  
Grain Refinement ◽  
High Pressure Torsion ◽  
Sorption Properties
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