Temat: hydrogen desorption - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The effects of microstructural modification by mechanical milling on hydrogen desorption from magnesium hydride
Autorzy:: Varin, R. A.
Czujko, T.
Wronski, Z. S.
Calka, A.
Powiązania:: https://bibliotekanauki.pl/articles/243099.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: automotive
hydrogen fuel for fuel cells
magnesium hydride
mechanical milling
hydrogen desorption
Opis:: Nanostructured hydrides fabricated by mechanical (ball) milling offer a promising alternative to hydrogen storage in compressed or liquid form. However, ball milling brings about both beneficial and detrimental effects to their hydrogen desorption characteristics. These effects have been studied in the ball milled magnesium hydride, MgH2. A beneficial effect is that the refinement of the hydride powder particle size and the gamma-MgH2 phase residing within the powder particles, acting additively, are responsible for a substantial reduction of hydrogen desorption temperature of MgH2 hydride. A detrimental effect is a reduction of the hydrogen storage capacity after nanostructuring of MgH2 by ball milling. Both effects are presented and discussed. In particular DSC hydrogen desorption curves at the heating rate of 4°C/min of the ABCR powder as received, milled in hydrogen for (a) 0.25 to 5h and (b) 10 and 20h and finally cycled, XRD patterns of MgH2 (Tego Magnan registered trademark) powders milled continuously for 100h, desorption curves under 0.1 MPa H2 at various temperatures of commercial MgH2 powder Tego Magnan registered trademark milled continuously for 20h are presented in the paper.
Źródło:: Journal of KONES; 2007, 14, 2; 529-536
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Effect of Natural Silica from Rice Husk Ash and Nickel as a Catalyst on the Hydrogen Storage Properties of $MgH_2$
Autorzy:: Malahayati, -
Yufita, Evi
Ismail, Ismail
Mursal, Mursal
Idroes, Rinaldi
Jalil, Zulkarnain
Powiązania:: https://bibliotekanauki.pl/articles/2028172.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: hydrogen storage
natural silica
rice husk ash
high energy ball milling
desorption temperature
Opis:: The characteristics of $MgH_2$ as a hydrogen storage material in this study were observed by varying the composition of the catalyst. The added catalyst was a dual catalyst, namely nickel and natural silica extracted from rice husk ash with a composition of $MgH_2$ + 10 wt% $SiO_2$ + 10 wt% Ni (Sample A), then $MgH_2$ + 5 wt% $SiO_2$ + 10 wt% Ni (Sample B) , and $MgH_2$ + 10 wt% $SiO_2$ + 5 wt% Ni (sample C). The samples were prepared using the high energy ball milling (HEBM). The results showed that the natural silica extracted from rice husk ash (hereafter called “RHA“) can be used as a catalyst in $MgH_2$. Then, simultaneous use of nickel with silica as dual catalyst has shown the improvement in the hydrogen storage characteristics such as temperature and desorption time. The results of this study also indicate that the composition of the catalyst affects the particle size, although the time and milling treatment are the same. Furthermore, the particle size affects the characteristics of $MgH_2$ as a hydrogen storage material. Apart from particle size, there are other parameters that influence the characteristics of $MgH_2$, which appear during the sample preparation process such as impurity and agglomeration phases, all of which are closely related to the composition and type of catalyst used and the milling treatment applied to the sample. The 10 hours milling time used in this study has succeeded in reducing the sample to nano size. The Mg-based materials which have a nanostructure will have a larger contact area for the hydrogen reaction. The diffusion distance during the hydrogen absorption reaction also becomes smaller so as to improve the kinetic and thermodynamic characteristics of $MgH_2$.
Źródło:: Journal of Ecological Engineering; 2021, 22, 11; 79-85
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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