Cobalt–Aluminum co-Precipitated Catalysts and Their Performance in the Fischer–Tropsch Synthesis
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169
|
| Output data |
Year: 2001,
Volume: 168,
Number: 1-2,
Pages: 193-207
Pages count
: 15
DOI:
10.1016/S1381-1169(00)00529-X
|
| Tags |
Alumina, Cobalt, Fischer-Tropsch, Metal-support interaction, Spinels |
| Authors |
Khassin Alexander A.
1
,
Yurieva Tamara M.
1
,
Kustova Galina N.
1
,
Itenberg Izabella Sh.
1
,
Demeshkina Margarita P.
1
,
Krieger Tamara A.
1
,
Plyasova Lyudmila M.
1
,
Chermashenczeva Galina K.
1
,
Parmon Valentin N.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, 5, Pr. Lavrentieva, Novosibirsk 630090, Russia
|
|
Cobalt–aluminum catalysts were prepared using either Co2+ precipitation onto freshly prepared Mg–Al or Zn–Al hydrotalcite (promoted samples) or co-precipitation of Co2+ and Al3+ (non-promoted samples). The evolution of initial hydrotalcite structure was monitored during its calcination and reductive treatment. It has been shown that, at moderate temperatures, hydrotalcites results decomposition yields a Co oxide phase supported by a highly defective inverted spinel-like structure. Cations Co2+ enter the support structure, and occupy both tetrahedral and octahedral positions. Octahedron coordinated Co species are reduced at 580–620°C. After the reduction at 470–480°C catalyst phase composition shows Co0 supported on inverted spinel-like structure, which contains Co2+ in the octahedral coordination. Further reduction at 600°C transforms the support to ‘ideal’ spinel, which contains no octahedron coordinated Co2+. Chemical properties of the Co–Al catalysts, including their performance in the Fischer–Tropsch synthesis (FTS), were found to depend on the catalyst reduction temperature, and thus on the support structure. Metal-support interaction is supposed to explain the observed properties of metallic cobalt.