Direct decomposition of methane over SBA-15 supported Ni, Co and Fe based bimetallic catalysts

Manoj Pudukudy, Zahira Yaakob, Zubair Shamsul Akmal

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Thermocatalytic decomposition of methane is an alternative route for the production of COx-free hydrogen and carbon nanomaterials. In this work, a set of novel Ni, Co and Fe based bimetallic catalysts supported over mesoporous SBA-15 was synthesized by a facile wet impregnation route, characterized for their structural, textural and reduction properties and were successfully used for the methane decomposition. The fine dispersion of metal oxide particles on the surface of SBA-15, without affecting its mesoporous texture was clearly shown in the low angle X-ray diffraction patterns and the transmission electron microscopy (TEM) images. The nitrogen sorption analysis showed the reduced specific surface area and pore volume of SBA-15, after metal loading due to the partial filling of hexagonal mesopores by metal species. The results of methane decomposition experiments indicated that all of the bimetallic catalysts were highly active and stable for the reaction at 700 °C even after 300 min of time on stream (TOS). However, a maximum hydrogen yield of ∼56% was observed for the NiCo/SBA-15 catalyst within 30 min of TOS. A high catalytic stability was shown by the CoFe/SBA-15 catalyst with 51% of hydrogen yield during the course of reaction. The catalytic stability of the bimetallic catalysts was attributed to the formation of bimetallic alloys. Moreover, the deposited carbons were found to be in the form of a new set of hollow multi-walled nanotubes with open tips, indicating a base growth mechanism, which confirm the selectivity of SBA-15 supported bimetallic catalysts for the formation of open tip carbon nanotubes. The Raman spectroscopic and thermogravimetric analysis of the deposited carbon nanotubes over the bimetallic catalysts indicated their higher graphitization degree and oxidation stability.

Original languageEnglish
Pages (from-to)418-430
Number of pages13
JournalApplied Surface Science
Volume330
DOIs
Publication statusPublished - 1 Mar 2015

Fingerprint

Methane
Decomposition
Catalysts
Hydrogen
Carbon Nanotubes
Catalyst supports
Metals
Carbon nanotubes
Carbon
Graphitization
Spectroscopic analysis
Catalyst selectivity
Nanostructured materials
Impregnation
Specific surface area
Nanotubes
Diffraction patterns
Thermogravimetric analysis
Sorption
Oxides

Keywords

  • Base growth mechanism
  • Bimetallic catalysts
  • Hydrogen
  • Methane decomposition
  • Open tip carbon nanotubes
  • Raman analysis

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Direct decomposition of methane over SBA-15 supported Ni, Co and Fe based bimetallic catalysts. / Pudukudy, Manoj; Yaakob, Zahira; Akmal, Zubair Shamsul.

In: Applied Surface Science, Vol. 330, 01.03.2015, p. 418-430.

Research output: Contribution to journalArticle

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