Hydrogen desorption from alloys Mg–Cu(–KCl): Cu catalysis in detail

0541828 - ÚFM 2022 RIV GB eng J - Článek v odborném periodiku
Čermák, Jiří - Král, Lubomír - Roupcová, Pavla
Hydrogen desorption from alloys Mg–Cu(–KCl): Cu catalysis in detail.
International Journal of Hydrogen Energy. Roč. 46, č. 27 (2021), s. 14494-14507. ISSN 0360-3199. E-ISSN 1879-3487
Grant CEP: GA MŠMT(CZ) LQ1601
Institucionální podpora: RVO:68081723
Klíčová slova: Hydrogen storager * Magnesium alloys * Magnesium alloys * CatalysisCopper
Obor OECD: Materials engineering
Impakt faktor: 7.139, rok: 2021
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0360319921003633?via%3Dihub

Effect of chemical composition of Mg-xCu based alloys (x = 9.94–58.00 wt %) modified by KCl upon their hydrogen storage performance was studied. Kinetic curves and pressure-concentration isotherms were measured in the ranges up to 60 bar and 388 °C, respectively. It was observed that desorption rate dc/dt is not significantly influenced by the composition. Unknown Cu-rich phase was detected that has shown a catalytic effect on desorption from a mixture with other phases. Activation energy of hydrogen desorption decreased with increasing x from 180 kJ/mol down to 98 kJ/mol. Average hydride dissociation enthalpy, ΔH, for the lowest plateau was 75 kJ/mol which is equal to literature value for pure Mg. Slightly lover average value, 67 kJ/mol was obtained for the second plateau and ΔH for the third one decreased from 70 kJ/mol for the lowest to 49 kJ/mol for the highest x.
Trvalý link: http://hdl.handle.net/11104/0322641