Catalytic effect in the hydrogenation of Mg and Mg compounds: Surface analysis of MgMg2Ni and Mg2Ni

Schlapbach, L.; Shaltiel, D.; Oelhafen, P.

doi:10.1016/0025-5408(79)90220-4

Cited by 81 publications

(19 citation statements)

References 28 publications

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“…[1][2][3] However, one of disadvantages is its slow reaction speed of hydrogenation and dehydrogenation. Recently, it has been suggested that oxide catalyst is effective for improving the hydrogenation and dehydrogenation kinetics of Mg. Barkhordarian et al reported that Nb 2 O 5 had the best effect on the hydrogen storage properties of Mg and MgH 2 as an oxide catalysts.…”

mentioning

confidence: 99%

Study on reaction mechanism of dehydrogenation of magnesium hydride by in situ transmission electron microscopy

Isobe¹,

Ono²,

Yao³

et al. 2010

Applied Physics Letters

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In situ observation on dehydrogenation of MgH 2 was performed by using transmission electron microscope ͑TEM͒. 7-9 However, the detail of the catalytic reaction has not been understood yet. In this study, the change in the high resolution image before and after dehydrogenation was observed by using with TEM to examine the details of the catalytic reaction.In this study, two kinds of samples with 1 and 10 mol % of Nb 2 O 5 were prepared. For MgH 2 catalyzed with 1 mol % Nb 2 O 5 , MgH 2 powder ͑Alfa Aesar͒, and Nb 2 O 5 powder ͑me-soporous: Sigma-Aldrich͒ were ball-milled under the hydrogen atmosphere of 1.0 MPa for 20 h. On the other hand, for MgH 2 catalyzed with 10 mol % Nb 2 O 5 , MgH 2 powder, and Nb 2 O 5 powder ͑single-crystalline: Kojundo chemical Laboratory͒ were mixed by agate mortar in a glovebox filled with Ar gas. The samples were handled without exposure to air in whole process. The sample powder was placed on a microgrid and the grid was set into a heating specimen holder in the glove box under Ar atmosphere. The heating specimen holder was put into a plastic bag under Ar atmosphere and loaded into TEM equipment in order to prevent the oxidation. The samples were observed from room temperature to 200°C by using a TEM ͑JEOL-2010; 200 kV͒, and high resolution images of a 10 mol % catalyzed sample were obtained by using high voltage electron microscope ͑HVEM, JEM-ARM1300; 1250 kV͒. With respect to temperature control for in situ TEM observation, the temperature was rapidly raised up and kept at 100, 150, or 200°C. The TEM images were analyzed by the selected area electron diffraction pattern ͑SADP͒, fast Fourier transformation ͑FFT͒, and inverse fast Fourier transformation ͑IFFT͒.At the first step, observation by using a conventional TEM ͑200 kV͒ was carried out for MgH 2 catalyzed with 1 mol % Nb 2 O 5 , which showed a remarkable catalytic effect. APPLIED PHYSICS LETTERS 96, 223109 ͑2010͒

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mentioning

confidence: 99%

Study on reaction mechanism of dehydrogenation of magnesium hydride by in situ transmission electron microscopy

Isobe¹,

Ono²,

Yao³

et al. 2010

Applied Physics Letters

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show abstract

“…Another important factor is the limited dissociation rate of hydrogen molecules on the metal surface of Mg [4]. The dissociation barrier may be reduced or even completely eliminated by a small addition of a catalyst [4,5]. Finally, when pure Mg with the catalytic additive starts to absorb hydrogen, the third limiting factor becomes very important.…”

Section: Introductionmentioning

confidence: 99%

“…: +7 343 378 3675; fax: +7 343 374 5244. face, a heat treatment may be used involving several cycles of the annealing at ∼400 • C in vacuum and in hydrogen [3]. Another important factor is the limited dissociation rate of hydrogen molecules on the metal surface of Mg [4]. The dissociation barrier may be reduced or even completely eliminated by a small addition of a catalyst [4,5].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen reaction kinetics of Mg-based alloys synthesized by mechanical milling

Yermakov

Mushnikov

Уймин

et al. 2006

Journal of Alloys and Compounds

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“…This result indicates that the chemical state of Sample3 is partially oxidized state due to the residual gases in the deposition chamber. The chemical state of the MgeNi alloy phase is not observed within the experimental error, because the possible chemical shift of the Mg 2p XPS spectra between metallic Mg in pure Mg and in Mg 2 Ni is not larger than 0.2 eV [12]. When the above results are taken into account, the interface between the Mg nanoparticle and the Ni nanoparticle possibly exists.…”

Section: Tem Resultsmentioning

confidence: 87%

Hydrogen storage property of materials composed of Mg nanoparticles and Ni nanoparticles fabricated by gas evaporation method

Fujimoto

Ogawa

Kanai³

et al. 2015

International Journal of Hydrogen Energy

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Catalytic effect in the hydrogenation of Mg and Mg compounds: Surface analysis of MgMg2Ni and Mg2Ni

Cited by 81 publications

References 28 publications

Study on reaction mechanism of dehydrogenation of magnesium hydride by in situ transmission electron microscopy

Study on reaction mechanism of dehydrogenation of magnesium hydride by in situ transmission electron microscopy

Hydrogen reaction kinetics of Mg-based alloys synthesized by mechanical milling

Hydrogen storage property of materials composed of Mg nanoparticles and Ni nanoparticles fabricated by gas evaporation method

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