scholarly journals Hydrogen Desorption Properties of MgH2 + 10 wt% SiO2 + 5 wt% Ni Prepared by Planetary Ball Milling

2021 ◽  
Vol 16 (2) ◽  
pp. 280-285
Author(s):  
Malahayati Malahayati ◽  
Evi Yufita ◽  
Ismail Ismail ◽  
Mursal Mursal ◽  
Rinaldi Idroes ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Ball Milling ◽  
Milling Time ◽  
Thermodynamic Characteristics ◽  
Hydrogen Desorption ◽  
High Energy ◽  
Kinetic Properties ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Solid Form

MgH2 is a very hopeful material for application as hydrogen storage material in the solid form. This is due to its reversibility and its ability to store large amounts of hydrogen, which is 7.6 wt%. However, this material still has weaknesses, namely high operating temperature and slow kinetic reactions. Various attempts have been made to overcome this weakness, including downsizing and adding catalyst. In this study, double catalyst was used, namely natural silica extracted from rice husk ash and nickel nano powder, with a composition of MgH2 + 10 wt% SiO2 + 5 wt% Ni. The purpose of this research was to study the effect of downsizing and using these catalysts to the thermodynamic and kinetic properties of the hydrogen storage material MgH2. Samples were prepared by using High Energy Ball Milling (HEBM), with variations in milling time of 1, 5, 10, and 15 hours. The X-ray Diffraction (XRD) pattern showed the presence of an impurity phase in the samples milled for 10 and 15 hours. It also showed a reduction in grain size with increasing milling time. However, agglomeration has occurred in the samples milled for 15 hours. From the Scanning Electron Microscope (SEM) results can be seen that the sample with longer milling time, were homogeneously distribute. Thermal investigation showed that the lowest desorption temperature was achieved in samples with milling time of 5 and 10 hours, namely 287 °C and 288 °C. This study shows that natural silica catalyst plays a role in improving the thermodynamic characteristics of MgH2, while Ni plays a role in improving the kinetic characteristics of MgH2. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

In Situ Hydrogenation and Desulfurization of CS2 by Mg-Based Hydrogen Storage Material:Products and Mechanism Analysis

2013 ◽  
Vol 726-731 ◽  
pp. 668-672
Author(s):  
Tong Huan Zhang ◽  
Min Jian Yang ◽  
Peng Bo Li ◽  
Wei Xian Ran ◽  
Qian Qian Zhang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Ball Milling ◽  
Hydrogen Desorption ◽  
Mechanism Analysis ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Coupling Relationship ◽  
Negative Effect ◽  
Sulfur Fixation

Mg-based hydrogen storage material was prepared by ball milling, and then the material was used to react with CS2. The morphology and hydrogen desorption properties of the hydrogen storage material as well as the CS2hydrogenation product were analyzed. Results show that in situ hydrogenation and desulfurization of CS2happens with the MgH2in the hydrogen storage material as hydrogen donator and desulfurizer at 300 °C and ordinary pressure, and MgS, CH4and H2S are generated from the reaction. There is a coupling relationship between dehydrogenation of the hydrogen storage material and hydrogenation of CS2. The addition of nickel and molybdenum show negative effect on the sulfur fixation capability of the Mg-based hydrogen storage material though they could decrease the dehydrogenation temperature of the material.

scholarly journals Direct Synthesis of NaBH4 Nanoparticles from NaOCH3 for Hydrogen Storage

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4428 ◽  
Author(s):  
Ting Wang ◽  
Kondo-Francois Aguey-Zinsou
Keyword(s):  
Thermodynamic Properties ◽  
Hydrogen Storage ◽  
Fossil Fuels ◽  
Direct Synthesis ◽  
Hydrogen Desorption ◽  
Effective Strategy ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Experimental Conditions ◽  
Hydrogen Density

Hydrogen is regarded as a promising energy carrier to substitute fossil fuels. However, storing hydrogen with high density remains a challenge. NaBH4 is a potential hydrogen storage material due to its high gravimetric hydrogen density (10.8 mass%), but the hydrogen kinetic and thermodynamic properties of NaBH4 are poor against the application needs. Nanosizing is an effective strategy to improve the hydrogen properties of NaBH4. In this context, we report on the direct synthesis of NaBH4 nanoparticles (~6–260 nm) from the NaOCH3 precursor. The hydrogen desorption properties of such nanoparticles are reported as well as experimental conditions that lead to the synthesis of (Na2B12H12) free NaBH4 nanoparticles.

Light-weight NaNH2–NaBH4 hydrogen storage material synthesized via liquid phase ball milling

2014 ◽  
Vol 39 (25) ◽  
pp. 13576-13582 ◽  
Author(s):  
Ying Bai ◽  
Lu-lu Zhao ◽  
Yue Wang ◽  
Xin Liu ◽  
Feng Wu ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Hydrogen Storage ◽  
Ball Milling ◽  
Light Weight ◽  
Hydrogen Storage Material ◽  
Storage Material

scholarly journals Exploring the capability of mayenite (12CaO·7Al2O3) as hydrogen storage material

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Heidy Visbal ◽  
Takuya Omura ◽  
Kohji Nagashima ◽  
Takanori Itoh ◽  
Tsukuru Ohwaki ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Cost Effective ◽  
Hydrogen Desorption ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Cage Structure ◽  
H Nmr ◽  
Hydrogen Molecules ◽  
Oxygen Gas ◽  
And Storage

AbstractWe utilized nanoporous mayenite (12CaO·7Al2O3), a cost-effective material, in the hydride state (H−) to explore the possibility of its use for hydrogen storage and transportation. Hydrogen desorption occurs by a simple reaction of mayenite with water, and the nanocage structure transforms into a calcium aluminate hydrate. This reaction enables easy desorption of H− ions trapped in the structure, which could allow the use of this material in future portable applications. Additionally, this material is 100% recyclable because the cage structure can be recovered by heat treatment after hydrogen desorption. The presence of hydrogen molecules as H− ions was confirmed by 1H-NMR, gas chromatography, and neutron diffraction analyses. We confirmed the hydrogen state stability inside the mayenite cage by the first-principles calculations to understand the adsorption mechanism and storage capacity and to provide a key for the use of mayenite as a portable hydrogen storage material. Further, we succeeded in introducing H− directly from OH− by a simple process compared with previous studies that used long treatment durations and required careful control of humidity and oxygen gas to form O2 species before the introduction of H−.

Catalytic Effect of Ti on H-Desorption/Absorption Properties in MgH2 Prepared by Ball Milling

2014 ◽  
Vol 687-691 ◽  
pp. 4335-4338
Author(s):  
Yan Wang
Keyword(s):  
Ball Milling ◽  
Milling Time ◽  
Hydrogen Desorption ◽  
High Energy ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
X Ray ◽  
Milled Sample ◽  
Energy Ball ◽  
Kinetics Of

We report on the preparation and hydrogen desorption/absorption kinetics of nanocrystalline magnesium hydride (MgH2) added commercial Ti by high-energy ball milling. The phase and composition of the as-milled powders are characterized by X-ray diffraction (XRD). The results show that the milled sample contained MgH2phase, Ti phase and small amount of MgO phase. When the milling time is 30 h, the hydrogen desorption property of MgH2has been investigated and found that the sample releases 0.43, 0.86 and 0.90 wt% H2in 200 minutes at 280, 290 and 300oC , respectively. Moreover, the sample absorbs 0.48, 0.0.58 and 0.61 wt% H2in 15 minutes at 280, 290 and 300oC , respectively. It can be seen that the kinetics of hydrogen desorption/absorption of MgH2-Ti composite has been greatly enhanced compared to the pure MgH2.

scholarly journals Studi Katalis Ni Nano pada Material Penyimpan Hidrogen MgH2 yang Dipreparasi melalui Teknik Mechanical Alloying

2016 ◽  
Vol 6 (01) ◽  
pp. 1 ◽  
Author(s):  
Nirmala Sari ◽  
Adi Rahwanto ◽  
Zulkarnain Jalil
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Desorption ◽  
Motor Vehicles ◽  
Ni Catalyst ◽  
Hydrogen Storage Material ◽  
Minor Phase ◽  
Storage Material ◽  
Kinetic Reaction ◽  
Main Obstacle ◽  
Very High

The main obstacle which hinders the application of fuel cell fuels in motor vehicles today is the hydrogen storage tubes. One of the latest efforts in hydrogen storage research is to insert hydrogen in certain metals or called solid state hydrogen storage. Magnesium (Mg) is regarded as one of the material potential candidates absorbing hydrogen, because theoretically, it has the ability to absorb hydrogen in the large quantities of (7.6 wt%). This amount exceeds the minimum limit which is targeted Badan Energi Dunia (IEA), that is equal 5 wt%. However Mg has shortage, namely its kinetic reaction is very slow, it takes time to absorb hydrogen at least 60 minutes with very high operating temperatures (300-400 °C). The aim of this study is to improve the hydrogen desorption temperature hydrogen storage material based MgH2. In this method, milling of material is done in the time of 10 h with the variation of catalyst inserts a for 6wt%, 10wt% and 12 wt%. The results from XRD measurements in mind that the sample was reduced to scale nanocrystal. Phase that appears of the observation of result XRD is MgH2 phase as the main phase, and followed by Ni phase as minor phase. The result of observations with DSC, to the lowest temperature obtained on the sample with a weight of catalyst 12 wt% Ni catalyst that is equal to 376 °C. These results successfully repair pure temperature of Mg-based hydrides.

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