Effect of preparation method on Co-B catalytic activity for hydrogen generation from alkali NaBH4 solution

S. U. Jeong, E. A. Cho, SukWoo Nam, I. H. Oh, U. H. Jung, Sung Hyun Kim

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

A Co-B catalyst is used to generate hydrogen from alkaline aqueous NaBH4 solutions. This study examined the properties of a Co-B catalyst prepared using different precursors (CoCl2 and CoSO4) and NaBH4 / Co2 + mole ratios (0.67, 1.5, 3) at calcination temperatures of 130, 250 and 450 {ring operator} C. As the calcination temperature was increased in N2 atmosphere mixed with 1% air, the typical amorphous structure of Co-B disappeared and the X-ray diffraction peaks corresponding to Co3 O4 became sharper. Metallic Co was formed when a NaBH4 / Co2 + mole ratio of 3 was used as the reductant with a corresponding reduction in the rate of H2 generation. The highest level of H2 generation (2400 ml/min g) was obtained with CoCl2 as the precursor, a NaBH4 / CO2 + mole ratio of 1.5 as the reductant, and a calcination temperature of 250 {ring operator} C.

Original languageEnglish
Pages (from-to)1749-1754
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume32
Issue number12
DOIs
Publication statusPublished - 2007 Aug 1

Fingerprint

Alkalies
Calcination
roasting
catalytic activity
Hydrogen
alkalies
Catalyst activity
Reducing Agents
preparation
hydrogen
catalysts
operators
Catalysts
rings
Temperature
temperature
aqueous solutions
atmospheres
X ray diffraction
air

Keywords

  • Co-B catalyst
  • Hydrogen generation
  • NaBH

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

Cite this

Effect of preparation method on Co-B catalytic activity for hydrogen generation from alkali NaBH4 solution. / Jeong, S. U.; Cho, E. A.; Nam, SukWoo; Oh, I. H.; Jung, U. H.; Kim, Sung Hyun.

In: International Journal of Hydrogen Energy, Vol. 32, No. 12, 01.08.2007, p. 1749-1754.

Research output: Contribution to journalArticle

Jeong, S. U. ; Cho, E. A. ; Nam, SukWoo ; Oh, I. H. ; Jung, U. H. ; Kim, Sung Hyun. / Effect of preparation method on Co-B catalytic activity for hydrogen generation from alkali NaBH4 solution. In: International Journal of Hydrogen Energy. 2007 ; Vol. 32, No. 12. pp. 1749-1754.
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AU - Jung, U. H.

AU - Kim, Sung Hyun

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AB - A Co-B catalyst is used to generate hydrogen from alkaline aqueous NaBH4 solutions. This study examined the properties of a Co-B catalyst prepared using different precursors (CoCl2 and CoSO4) and NaBH4 / Co2 + mole ratios (0.67, 1.5, 3) at calcination temperatures of 130, 250 and 450 {ring operator} C. As the calcination temperature was increased in N2 atmosphere mixed with 1% air, the typical amorphous structure of Co-B disappeared and the X-ray diffraction peaks corresponding to Co3 O4 became sharper. Metallic Co was formed when a NaBH4 / Co2 + mole ratio of 3 was used as the reductant with a corresponding reduction in the rate of H2 generation. The highest level of H2 generation (2400 ml/min g) was obtained with CoCl2 as the precursor, a NaBH4 / CO2 + mole ratio of 1.5 as the reductant, and a calcination temperature of 250 {ring operator} C.

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