Methane decomposition over Ni, Co and Fe based monometallic catalysts supported on sol gel derived SiO2 microflakes

Manoj Pudukudy, Zahira Yaakob

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

The non-oxidative thermo catalytic decomposition of methane into COx-free hydrogen and nanocarbon has attracted recent research interest, due to the concern of zero emission of greenhouse gases and the bulk production of value added carbon nanomaterials. In this work, Nickel, Cobalt and Iron based monometallic catalysts supported over sol gel derived silica microflakes were synthesized via a facile wet impregnation route and were successfully used for the direct thermal decomposition of methane into COx free hydrogen and nanocarbon. The active phase of the fresh catalysts was found to be NiO, Co3O4 and Fe2O3. The field emission scanning electron microscopy images clearly indicated the fine dispersion of various agglomerated metal oxide nanostructures on the surface of the sol gel derived silica microflakes. A maximum hydrogen yield of 74% was obtained for the Ni based catalyst, with a slight deactivation with time on stream. The Co and Fe based monometallic catalysts were found to be less active but more stable than the Ni catalyst. Different types of carbon nanomaterials were observed on the surface of the catalysts after methane decomposition. Multi-walled carbon nanotubes, carbon particles with a fruit like morphology and multilayer graphene sheets were obtained over the Ni, Co and Fe catalysts respectively. The Raman and thermo-gravimetric analyses indicated their higher graphitization degree, crystallinity and oxidation stability.

Original languageEnglish
Pages (from-to)1009-1021
Number of pages13
JournalChemical Engineering Journal
Volume262
DOIs
Publication statusPublished - 5 Feb 2015

Fingerprint

Methane
Catalyst supports
Sol-gels
gel
methane
catalyst
decomposition
Decomposition
Catalysts
Hydrogen
Carbon
Nanostructured materials
Silicon Dioxide
hydrogen
Silica
carbon
silica
Carbon Nanotubes
Graphitization
graphitization

Keywords

  • Carbon nanotubes
  • Hydrogen
  • Methane decomposition
  • Monometallic catalysts
  • Multilayer graphene sheets
  • Silica microflakes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry

Cite this

Methane decomposition over Ni, Co and Fe based monometallic catalysts supported on sol gel derived SiO2 microflakes. / Pudukudy, Manoj; Yaakob, Zahira.

In: Chemical Engineering Journal, Vol. 262, 05.02.2015, p. 1009-1021.

Research output: Contribution to journalArticle

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