Hydrogen production by ethylene decomposition over Ni supported on novel carbon nanotubes and nanofibers

P. G. Savva, G. G. Olympiou, C. N. Costa, V. A. Ryzhkov, A. M. Efstathiou

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Ethylene decomposition over Ni supported on novel carbon nanotubes (CNT) and nanofibers under consecutive reaction/regeneration cycles to form CO-free hydrogen and carbon deposits have been investigated. The present work highlights the effects of support chemical composition, catalyst synthesis method and Ni metal loading on the catalytic activity and stability of nickel. A novel 0.5 wt.% Ni/CNT catalyst which presents the highest value of a constant hydrogen product yield (17.5 mol H2/mol Ni), following consecutive reaction (complete deactivation) → regeneration (20% O2/He, 400 °C) cycles, ever reported in the open literature has been developed. Transmission electron microscopy (TEM) and XRD studies revealed that the 0.5 wt.% Ni/CNT catalyst promotes the formation of two types of carbon nanofibers during ethylene decomposition at 400 °C, result that reduces significantly the rate of Ni encapsulation during reaction. The opposite is true in the case of 0.3 wt.% Ni/SiO2 catalyst. In the case of Ni/CNT, there is a narrow range of Ni loading for which maximum H2 product yield is obtained, while in the case of Ni/SiO2, a monotonic increase in the H2 product yield is obtained (Ni loading in the range 0.3-7.0 wt.%).

Original languageEnglish
Pages (from-to)78-84
Number of pages7
JournalCatalysis Today
Volume102-103
DOIs
Publication statusPublished - 30 May 2005
Externally publishedYes

Keywords

  • CH decomposition
  • Carbon nanotubes
  • Gasification of carbon nanofibers
  • Ni/CNF
  • Ni/SiO

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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