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Effect of Al2O3/SiO2 ratio on iron-based catalysts for Fischer–Tropsch synthesis
- Source :
-
Fuel . Jul2006, Vol. 85 Issue 10/11, p1371-1377. 7p. - Publication Year :
- 2006
-
Abstract
- Abstract: A systematic study was undertaken to investigate the effects of Al2O3/SiO2 ratio on reduction, carburization and catalytic behavior of iron-based Fischer–Tropsch synthesis (FTS) catalysts promoted with potassium and copper. The catalysts were characterized by N2 physical adsorption, CO2 temperature-programmed desorption (TPD), H2 temperature-programmed reduction (TPR) and Mössbauer effect spectroscopy (MES). CO2-TPD indicated that Al2O3 binder has stronger acidity than SiO2 binder and weakens the surface basicity of the catalysts. H2-TPR profiles suggested that the lower Al2O3/SiO2 ratio promotes the reduction of Fe2O3→Fe3O4. With further increasing Al2O3/SiO2 ratio, the transformation of Fe2O3→Fe3O4 shifts to higher temperatures. The MES results showed that the increase of Al2O3/SiO2 ratio leads to the relatively large crystallite size of α-Fe2O3 and inhibits carburization of the catalyst. During reaction tests in a fixed bed reactor it was found that a maximum in catalyst activity is noted at the Al2O3/SiO2 ratio of 5/20 (weight basis). The selectivity to olefins shows a rapid decrease and the formations of methane and light hydrocarbons are promoted with increasing Al2O3/SiO2 ratio. The oxygenate selectivity in total products increases with increasing Al2O3/SiO2 ratio. [Copyright &y& Elsevier]
- Subjects :
- *CATALYSTS
*FISCHER-Tropsch process
*POTASSIUM
*COPPER
Subjects
Details
- Language :
- English
- ISSN :
- 00162361
- Volume :
- 85
- Issue :
- 10/11
- Database :
- Academic Search Index
- Journal :
- Fuel
- Publication Type :
- Academic Journal
- Accession number :
- 20526756
- Full Text :
- https://doi.org/10.1016/j.fuel.2005.12.016