Characterization of Fischer-Tropsch cobalt-based catalytic systems (Co/SiO2 and Co/Al2O3) by X-ray diffraction and magnetic measurements

P. Dutta, N. O. Elbashir, A. Manivannan, M. S. Seehra, C. B. Roberts

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Results of the characterization of six Co-based Fischer-Tropsch (FT) catalysts, with 15% Co loading and supported on SiO2 and Al 2O3, are presented. Room temperature X-ray diffraction (XRD), temperature and magnetic field (H) variation of the magnetization (M), and low-temperature (5 K) electron magnetic resonance (EMR) are used for determining the electronic states (Co0, CoO, CO3O 4, Co2+) of cobalt. Performance of these catalysts for FT synthesis is tested at reaction temperature of 240 °C and pressure of 20 bars. Under these conditions, 15% Co/SiO2 catalysts yield higher CO and syngas conversions with higher methane selectivity than 15% Co/ Al 2O3 catalysts. Conversely the Al2O3 supported catalysts gave much higher selectivity towards olefins than Co/SiO2. These results yield the correlation that the presence of Co3O4 yield higher methane selectivity whereas the presence of Co2+ species yields lower methane selectivity but higher olefin selectivity. The activities and selectivities are found to be stable for 55 h on-stream.

Original languageEnglish
Pages (from-to)203-209
Number of pages7
JournalCatalysis Letters
Volume98
Issue number4
DOIs
Publication statusPublished - Dec 2004
Externally publishedYes

Fingerprint

Magnetic variables measurement
Cobalt
magnetic measurement
Methane
cobalt
selectivity
X ray diffraction
Catalysts
Catalyst selectivity
Alkenes
catalysts
diffraction
Olefins
x rays
methane
Electron resonance
Fischer-Tropsch synthesis
alkenes
Electronic states
Magnetic resonance

Keywords

  • Cobalt catalysts
  • Fischer-tropsch synthesis
  • Magnetization
  • X-ray diffraction

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

Characterization of Fischer-Tropsch cobalt-based catalytic systems (Co/SiO2 and Co/Al2O3) by X-ray diffraction and magnetic measurements. / Dutta, P.; Elbashir, N. O.; Manivannan, A.; Seehra, M. S.; Roberts, C. B.

In: Catalysis Letters, Vol. 98, No. 4, 12.2004, p. 203-209.

Research output: Contribution to journalArticle

Dutta, P. ; Elbashir, N. O. ; Manivannan, A. ; Seehra, M. S. ; Roberts, C. B. / Characterization of Fischer-Tropsch cobalt-based catalytic systems (Co/SiO2 and Co/Al2O3) by X-ray diffraction and magnetic measurements. In: Catalysis Letters. 2004 ; Vol. 98, No. 4. pp. 203-209.
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