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

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.

authors

• Elbashir, Nimir

published proceedings

• CATALYSIS LETTERS

author list (cited authors)

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

citation count

• 20

complete list of authors

• Dutta, P||Elbashir, NO||Manivannan, A||Seehra, MS||Roberts, CB

publication date

• December 2004

publisher

• Springer Nature  Publisher

published in

• Catalysis Letters  Journal

keywords

• Cobalt Catalysts
• Fischer-tropsch Synthesis
• Magnetization
• X-Ray Diffraction

Digital Object Identifier (DOI)

• 10.1007/s10562-004-8681-2

start page

• 203

end page

• 210

volume

• 98

issue

• 4

URL

• https://doi.org/10.1007/s10562-004-8681-2