Excellent hydrolysis performances of Mg3RE hydrides

“…Hydrogenated Mg 3 RE (where RE denotes La‐rich and Ce‐rich metals) has been acclaimed to have excellent hydrolysis properties for the first time. Hydrolysis of hydrogenated Mg 3 RE produced 695 mL g −1 hydrogen in 5 min, 828 mL g −1 in 15 min, and the highest hydrogen yield of 9.79 wt% at 298 K. Compared with other hydrogenated Mg 3 La, Mg 3 La, Mg 3 Ce, Mg 3 Pr, and Mg 3 Nd, hydrogenated Mg 3 RE displayed the fastest hydrolysis rate due to mutual catalysis of LaH 3 , CeH 3 , PrH 3 , and Nd 2 H 5 .…”

Section: Introductionmentioning

confidence: 93%

Decomposition of Methane to Carbon and Hydrogen: A Catalytic Perspective

Musamali

Isa

2019

Energy Tech

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Catalytic decomposition of methane is a viable method of producing hydrogen and carbon nanomaterials. Hydrogen gas is mainly used as a reactant in the chemical industry, i.e., petrochemicals, glass, and pharmaceutical industries, whereas carbon may be used in direct carbon fuel cells or marketed as a filamentous carbon. Demand for carbon monoxide (CO)–free hydrogen continues to rise due to the increase in the number of its applications. Currently, a significant amount of hydrogen comes from gasification of natural gas, oxidation, and steam reforming of hydrocarbons. In all these technologies, CO is formed as a by‐product that requires tedious and costly processes to separate hydrogen from syngas. Herein, the recent literature on methane decomposition, methane reaction kinetics, catalyst performance, hydrogen yield, and formation of carbon nanomaterial are reviewed. The scope of this work is limited to direct conversion of methane into carbon and hydrogen; therefore, processes involving synthesis gas as intermediate products are not covered. Finally, catalysts that are often used in methane decomposition, their deactivation, and regeneration are discussed with the aim of documenting the foundation upon which an entirely new class of catalysts can be built to enhance their activity, selectivity, and yield.

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“…The Mg3La and Mg3LaNi0.1 alloys prepared by induction melting with pure Mg and La could be hydrogenated in situ at room temperature and 3.8 MPa of hydrogen pressure to form the LaH3/MgH2 (hereafter referred to as H-Mg3La) and LaH3/MgH2/Ni (hereafter referred to as H-Mg3LaNi0.1) composites [66]. To further study the influence of the light rare earth (RE) elements on the hydrolysis performance of the composite formed in situ, hydrogenated Mg3Mm (H-Mg3Mm, Mm denotes the mischmetal), Mg3La (H-Mg3La), Mg3Ce (H-Mg3Ce), Mg3Pr (H-Mg3Pr), and Mg3Nd (H-Mg3Nd) composites were also prepared by hydrogenating the Mg3Mm, Mg3La, Mg3Ce, Mg3Pr, and Mg3Nd (H-Mg3Nd) alloys at 298 K [67]. The hydrolysis performances of the H-Mg3Mm, H-Mg3La, H-Mg3Ce, H-Mg3Pr, and H-Mg3Nd composites were investigated at 298 K, as shown in Figure 3.…”

Section: Enhancement Of the Hydrolysis Properties Of Mgh2-based Hydrimentioning

confidence: 99%

Enhanced Hydrogen Generation Properties of MgH2-Based Hydrides by Breaking the Magnesium Hydroxide Passivation Layer

Ouyang

Huang

et al. 2015

Energies

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Due to its relatively low cost, high hydrogen yield, and environmentally friendly hydrolysis byproducts, magnesium hydride (MgH2) appears to be an attractive candidate for hydrogen generation. However, the hydrolysis reaction of MgH2 is rapidly inhibited by the formation of a magnesium hydroxide passivation layer. To improve the hydrolysis properties of MgH2-based hydrides we investigated three different approaches: ball milling, synthesis of MgH2-based composites, and tuning of the solution composition. We demonstrate that the formation of a composite system, such as the MgH2/LaH3 composite, through ball milling and in situ synthesis, can improve the hydrolysis properties of MgH2 in pure water. Furthermore, the addition of Ni to the MgH2/LaH3 composite resulted in the synthesis of LaH3/MgH2/Ni composites. The LaH3/MgH2/Ni composites exhibited a higher hydrolysis rate-120 mL/(g·min) of H2 in the first 5 min-than the MgH2/LaH3 composite-95 mL/(g·min)-without the formation of the magnesium hydroxide passivation layer. Moreover, the yield rate was controlled by manipulation of the particle size via ball milling. OPEN ACCESSEnergies 2015, 8 4238The hydrolysis of MgH2 was also improved by optimizing the solution. The MgH2 produced 1711.2 mL/g of H2 in 10 min at 298 K in the 27.1% ammonium chloride solution, and the hydrolytic conversion rate reached the value of 99.5%.

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Excellent hydrolysis performances of Mg3RE hydrides

Cited by 140 publications

References 31 publications

Electrochemical properties of hypo-stoichiometric Y-doped AB 2 metal hydride alloys at ultra-low temperature

Electrochemical properties of hypo-stoichiometric Y-doped AB 2 metal hydride alloys at ultra-low temperature

Decomposition of Methane to Carbon and Hydrogen: A Catalytic Perspective

Enhanced Hydrogen Generation Properties of MgH2-Based Hydrides by Breaking the Magnesium Hydroxide Passivation Layer

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