Hydrogen Storage Properties of Ball Milled MgH2 with Additives- Ni, V and Activated Carbons Obtained from Different By-Products

The hydrogen sorption of materials based on 80 wt.% MgH2 with the addition of 15 wt.% Ni or V and 5 wt.% activated carbons synthesized from polyolefin wax, a waste product from polyethylene production (POW), walnut shells (CAN), and peach stones (CPS) prepared by milling under an inert Ar atmosphere...

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Published inMaterials Vol. 16; no. 20; p. 6823
Main Authors Grigorova, Eli, Markov, Pavel, Tsyntsarski, Boyko, Tzvetkov, Peter, Stoycheva, Ivanka
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 23.10.2023
MDPI
Subjects
Absorption
Activated carbon
Additives
Adsorbents
carbon materials
Desorption
Gases
Graphite
Hydrogen
Hydrogen storage
Hydrogenation
Magnesium
metal hydrides
Polyolefins
Pyrolysis
Solids
Sorption
Temperature
Bulgaria
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Summary:The hydrogen sorption of materials based on 80 wt.% MgH2 with the addition of 15 wt.% Ni or V and 5 wt.% activated carbons synthesized from polyolefin wax, a waste product from polyethylene production (POW), walnut shells (CAN), and peach stones (CPS) prepared by milling under an inert Ar atmosphere for a period of 1 h, is investigated. All precursors are submitted to pyrolysis followed by steam activation in order to obtain the activated carbons. The hydrogen sorption evaluations are carried out for absorption at 473 and 573 K with pressure of 1 MPa and for desorption at 623 and 573 K with pressure of 0.15 MPa. The composition of the samples after milling and hydrogenation is monitored by X-ray diffraction analyses. The 80 wt.% MgH2–15 wt. %Ni–5 wt.% POW or CAN after absorption–desorption cycling and in a hydrogenated state at 573 K and 1 MPa are analyzed by TEM.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma16206823