Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus

Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus

<p>In this work, Zn(BH<sub>4</sub>)<sub>2</sub>, Ni, or Ti were selected as additives to improve the hydriding and dehydriding rates of magnesium. Zn(BH<sub>4</sub>)<sub>2</sub> was prepared by milling ZnCl<sub>2</sub> and NaBH<sub...

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Main Authors: Young Jun KWAK, Hye Ryoung PARK, Myoung Youp SONG
Format: Article
Language:English
Published: Kaunas University of Technology 2017-02-01
Series:Medžiagotyra
Online Access:http://matsc.ktu.lt/index.php/MatSc/article/view/14270
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spelling doaj-f4521b5d3df64fd48eaa98f819e4c4c12020-11-25T00:11:01ZengKaunas University of TechnologyMedžiagotyra1392-13202029-72892017-02-01231212610.5755/j01.ms.23.1.142708353Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric ApparatusYoung Jun KWAK0Hye Ryoung PARK1Myoung Youp SONG2Chonbuk National UniversityChonnam National UniversityChonbuk National University<p>In this work, Zn(BH<sub>4</sub>)<sub>2</sub>, Ni, or Ti were selected as additives to improve the hydriding and dehydriding rates of magnesium. Zn(BH<sub>4</sub>)<sub>2</sub> was prepared by milling ZnCl<sub>2</sub> and NaBH<sub>4</sub> in a planetary ball mill under an Ar atmosphere. The prepared Zn(BH<sub>4</sub>)<sub>2</sub> sample contained NaCl. 13.6 wt% MgH<sub>2</sub>+49.1 wt% Zn(BH<sub>4</sub>)<sub>2</sub>+30.2 wt% NaCl+7.0 wt% Ni (named 14MgH<sub>2</sub>+49Zn(BH<sub>4</sub>)<sub>2</sub>+30NaCl+7Ni) and 13.6 wt% MgH<sub>2</sub>+49.1 wt% Zn(BH<sub>4</sub>)<sub>2</sub>+30.2 wt% NaCl+7.0 wt% Ti (named 14MgH<sub>2</sub>+49Zn(BH<sub>4</sub>)<sub>2</sub>+30NaCl+7Ti) samples were prepared by horizontal ball milling. The gas release properties, especially the metal hydride decomposition temperatures (the onset temperature of the metal hydride decomposition and the maximum rate of released gas quantity change with temperature change), of the prepared samples were investigated using a Sievert’s type volumetric apparatus. The quantity of the gas released under 1.0 bar H<sub>2</sub> was measured as the temperature was increased and the variation in the rate of released gas quantity <em>G<sub>r</sub></em> change with temperature <em>T</em> change, <em>dG<sub>r</sub>/dT</em>, as a function of temperature was obtained. This analysis method can be used instead of thermal analysis methods such as thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), and differential thermal analysis (DTA). The investigated properties of the samples were then compared. In the as-milled 14MgH<sub>2 </sub>+49Zn(BH<sub>4</sub>)<sub>2</sub>+30NaCl+7Ni, it is believed that Zn(BH<sub>4</sub>)<sub>2</sub> begins to decompose at about 350 K and the rate of <em>G<sub>r</sub></em> change with <em>T</em> change, <em>dG<sub>r</sub>/dT</em>, reaches its peak at about 390 K, and that MgH<sub>2 </sub>begins to decompose at about 670 K and <em>dG<sub>r</sub>/dT</em> reaches its peak at about 698 K.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.23.1.14270">http://dx.doi.org/10.5755/j01.ms.23.1.14270</a></p>http://matsc.ktu.lt/index.php/MatSc/article/view/14270
collection DOAJ
language English
format Article
sources DOAJ
author Young Jun KWAK
Hye Ryoung PARK
Myoung Youp SONG
spellingShingle Young Jun KWAK
Hye Ryoung PARK
Myoung Youp SONG
Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus
Medžiagotyra
author_facet Young Jun KWAK
Hye Ryoung PARK
Myoung Youp SONG
author_sort Young Jun KWAK
title Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus
title_short Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus
title_full Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus
title_fullStr Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus
title_full_unstemmed Analysis of the Metal hydride Decomposition Temperatures of Zn(BH4)2 – MgH2 – Tm (Tm = Ni, Ti or Fe) Using a Sievert’s Type Volumetric Apparatus
title_sort analysis of the metal hydride decomposition temperatures of zn(bh4)2 – mgh2 – tm (tm = ni, ti or fe) using a sievert’s type volumetric apparatus
publisher Kaunas University of Technology
series Medžiagotyra
issn 1392-1320
2029-7289
publishDate 2017-02-01
description <p>In this work, Zn(BH<sub>4</sub>)<sub>2</sub>, Ni, or Ti were selected as additives to improve the hydriding and dehydriding rates of magnesium. Zn(BH<sub>4</sub>)<sub>2</sub> was prepared by milling ZnCl<sub>2</sub> and NaBH<sub>4</sub> in a planetary ball mill under an Ar atmosphere. The prepared Zn(BH<sub>4</sub>)<sub>2</sub> sample contained NaCl. 13.6 wt% MgH<sub>2</sub>+49.1 wt% Zn(BH<sub>4</sub>)<sub>2</sub>+30.2 wt% NaCl+7.0 wt% Ni (named 14MgH<sub>2</sub>+49Zn(BH<sub>4</sub>)<sub>2</sub>+30NaCl+7Ni) and 13.6 wt% MgH<sub>2</sub>+49.1 wt% Zn(BH<sub>4</sub>)<sub>2</sub>+30.2 wt% NaCl+7.0 wt% Ti (named 14MgH<sub>2</sub>+49Zn(BH<sub>4</sub>)<sub>2</sub>+30NaCl+7Ti) samples were prepared by horizontal ball milling. The gas release properties, especially the metal hydride decomposition temperatures (the onset temperature of the metal hydride decomposition and the maximum rate of released gas quantity change with temperature change), of the prepared samples were investigated using a Sievert’s type volumetric apparatus. The quantity of the gas released under 1.0 bar H<sub>2</sub> was measured as the temperature was increased and the variation in the rate of released gas quantity <em>G<sub>r</sub></em> change with temperature <em>T</em> change, <em>dG<sub>r</sub>/dT</em>, as a function of temperature was obtained. This analysis method can be used instead of thermal analysis methods such as thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), and differential thermal analysis (DTA). The investigated properties of the samples were then compared. In the as-milled 14MgH<sub>2 </sub>+49Zn(BH<sub>4</sub>)<sub>2</sub>+30NaCl+7Ni, it is believed that Zn(BH<sub>4</sub>)<sub>2</sub> begins to decompose at about 350 K and the rate of <em>G<sub>r</sub></em> change with <em>T</em> change, <em>dG<sub>r</sub>/dT</em>, reaches its peak at about 390 K, and that MgH<sub>2 </sub>begins to decompose at about 670 K and <em>dG<sub>r</sub>/dT</em> reaches its peak at about 698 K.</p><p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.23.1.14270">http://dx.doi.org/10.5755/j01.ms.23.1.14270</a></p>
url http://matsc.ktu.lt/index.php/MatSc/article/view/14270
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