Synergistic hydrogen desorption behavior of magnesium aluminum hydride synthesized by mechano-chemical activation method

Cheng Hsien Yang, Tzu Teng Chen, Wen Ta Tsai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A mechano-chemical activation synthesis (MCAS) is employed to fabricate Mg(AlH 4) 2 via milling the precursors, specifically NaAlH 4 and MgCl 2. The corresponding dehydrogenation behavior of the synthesized powders is investigated. The experimental results showed that incomplete synthesis or premature dehydrogenation may occur if the milling process was not properly controlled. The hydrogen content of each synthesized powder is determined by using a thermal gravimetric analyzer (TGA). The dehydrogenation reactions of the synthesized powders are investigated by employing ex situ X-ray diffraction (XRD), in situ synchrotron XRD and differential thermal analysis (DTA). The results showed that the incompletely synthesized powder consisted of residual NaAlH 4 in the synthesized Mg(AlH 4) 2, which demonstrated an initial dehydrogenation temperature as low as 100 °C and accompanied with a maximum amount (3.1 wt%) of H 2 released below 350 °C. The mutual catalytic effect of both NaAlH 4 and Mg(AlH 4) 2 on lowering their initial dehydrogenation temperature is confirmed.

Original languageEnglish
Pages (from-to)126-132
Number of pages7
JournalJournal of Alloys and Compounds
Volume525
DOIs
Publication statusPublished - 2012 Jun 5

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Dehydrogenation
Aluminum
Hydrides
Magnesium
Hydrogen
Desorption
Chemical activation
Powders
X ray diffraction
Synchrotrons
Differential thermal analysis
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "A mechano-chemical activation synthesis (MCAS) is employed to fabricate Mg(AlH 4) 2 via milling the precursors, specifically NaAlH 4 and MgCl 2. The corresponding dehydrogenation behavior of the synthesized powders is investigated. The experimental results showed that incomplete synthesis or premature dehydrogenation may occur if the milling process was not properly controlled. The hydrogen content of each synthesized powder is determined by using a thermal gravimetric analyzer (TGA). The dehydrogenation reactions of the synthesized powders are investigated by employing ex situ X-ray diffraction (XRD), in situ synchrotron XRD and differential thermal analysis (DTA). The results showed that the incompletely synthesized powder consisted of residual NaAlH 4 in the synthesized Mg(AlH 4) 2, which demonstrated an initial dehydrogenation temperature as low as 100 °C and accompanied with a maximum amount (3.1 wt{\%}) of H 2 released below 350 °C. The mutual catalytic effect of both NaAlH 4 and Mg(AlH 4) 2 on lowering their initial dehydrogenation temperature is confirmed.",
author = "Yang, {Cheng Hsien} and Chen, {Tzu Teng} and Tsai, {Wen Ta}",
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Synergistic hydrogen desorption behavior of magnesium aluminum hydride synthesized by mechano-chemical activation method. / Yang, Cheng Hsien; Chen, Tzu Teng; Tsai, Wen Ta.

In: Journal of Alloys and Compounds, Vol. 525, 05.06.2012, p. 126-132.

Research output: Contribution to journalArticle

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AU - Yang, Cheng Hsien

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AU - Tsai, Wen Ta

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AB - A mechano-chemical activation synthesis (MCAS) is employed to fabricate Mg(AlH 4) 2 via milling the precursors, specifically NaAlH 4 and MgCl 2. The corresponding dehydrogenation behavior of the synthesized powders is investigated. The experimental results showed that incomplete synthesis or premature dehydrogenation may occur if the milling process was not properly controlled. The hydrogen content of each synthesized powder is determined by using a thermal gravimetric analyzer (TGA). The dehydrogenation reactions of the synthesized powders are investigated by employing ex situ X-ray diffraction (XRD), in situ synchrotron XRD and differential thermal analysis (DTA). The results showed that the incompletely synthesized powder consisted of residual NaAlH 4 in the synthesized Mg(AlH 4) 2, which demonstrated an initial dehydrogenation temperature as low as 100 °C and accompanied with a maximum amount (3.1 wt%) of H 2 released below 350 °C. The mutual catalytic effect of both NaAlH 4 and Mg(AlH 4) 2 on lowering their initial dehydrogenation temperature is confirmed.

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