Co-αAl2O3-Cu as shaped catalyst in NaBH 4 hydrolysis

R. Chamoun, U. B. Demirci, Y. Zaatar, A. Khoury, P. Miele

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A study about catalytic films of Co-supported-over-αAl 2O3 fabricated by electrophoretic deposition (EPD) is reported, the as-prepared shaped catalysts being intended to catalyze NaBH 4 hydrolysis. Co-αAl2O3 supported over Cu substrate can be prepared by a 2-step route: (i) preparation of the supported catalyst Co-αAl2O3 (in powder form) by wet impregnation of CoCl2 over αAl2O3, followed by a reduction, and (ii) fabrication of Co-αAl2O 3-Cu (thin film over Cu) by EPD. Both types of catalysts, whatever their form, are highly efficient in hydrolyzing NaBH4, conversions of 100% and HGRs of tens of mL(H2) min-1 being achieved at 60-80 °C. The Co-αAl2O3-Cu catalysts are even more reactive than the Co-αAl2O3 catalysts because the surface of the former materials becomes much more acid than that of the latter ones in the course of the EPD process. The respective rate laws and reaction kinetics have been determined. Independently on the catalyst form, apparent activation energies of about 52 kJ mol-1 and positive reaction orders versus the initial NaBH4 concentration (i.e. 0.3-0.7) were calculated, suggesting that the EPD does not affect the reaction mechanisms. Besides, it is showed that the hydrolysis is really catalytic as well as typical of a heterogeneous process. For example, an apparent reaction order versus the Co content of 0.9 was calculated. All of these results among others are reported and discussed in the present article.

Original languageEnglish
Pages (from-to)6583-6591
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume35
Issue number13
DOIs
Publication statusPublished - 1 Jul 2010
Externally publishedYes

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hydrolysis
Hydrolysis
catalysts
Catalysts
Catalyst supports
Reaction kinetics
Impregnation
Activation energy
reaction kinetics
Powders
Fabrication
Thin films
routes
Acids
activation energy
Substrates
preparation
acids
fabrication
kinetics

Keywords

  • Alumina
  • Cobalt
  • Electrophoretic deposition
  • Hydrolysis
  • Sodium borohydride

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Chamoun, R., Demirci, U. B., Zaatar, Y., Khoury, A., & Miele, P. (2010). Co-αAl2O3-Cu as shaped catalyst in NaBH 4 hydrolysis. International Journal of Hydrogen Energy, 35(13), 6583-6591. https://doi.org/10.1016/j.ijhydene.2010.04.107

Co-αAl2O3-Cu as shaped catalyst in NaBH 4 hydrolysis. / Chamoun, R.; Demirci, U. B.; Zaatar, Y.; Khoury, A.; Miele, P.

In: International Journal of Hydrogen Energy, Vol. 35, No. 13, 01.07.2010, p. 6583-6591.

Research output: Contribution to journalArticle

Chamoun, R, Demirci, UB, Zaatar, Y, Khoury, A & Miele, P 2010, 'Co-αAl2O3-Cu as shaped catalyst in NaBH 4 hydrolysis', International Journal of Hydrogen Energy, vol. 35, no. 13, pp. 6583-6591. https://doi.org/10.1016/j.ijhydene.2010.04.107
Chamoun, R. ; Demirci, U. B. ; Zaatar, Y. ; Khoury, A. ; Miele, P. / Co-αAl2O3-Cu as shaped catalyst in NaBH 4 hydrolysis. In: International Journal of Hydrogen Energy. 2010 ; Vol. 35, No. 13. pp. 6583-6591.
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