Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5

Nobuko Hanada, Takayuki Ichikawa, Satoshi Hino, Hironobu Fujii

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195 Citations (Scopus)

Abstract

Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ∼4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 s and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ∼6 mass% hydrogen at 160 °C under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ∼71 kJ/mol H2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.

Original languageEnglish
Pages (from-to)46-49
Number of pages4
JournalJournal of Alloys and Compounds
Volume420
Issue number1-2
DOIs
Publication statusPublished - 2006 Aug 31
Externally publishedYes

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Keywords

  • High energy ballmilling
  • Hydrogen storage materials
  • Thermal analysis

ASJC Scopus subject areas

  • Metals and Alloys

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