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Novel precipitated iron Fischer–Tropsch catalysts with Fe3O4 coexisting with α-Fe2O3.
- Source :
- Catalysis Letters; Jun2005, Vol. 102 Issue 3/4, p211-218, 8p
- Publication Year :
- 2005
-
Abstract
- The present study was undertaken to investigate the catalytic behavior of an industrial iron catalyst (Fe/Cu/K/SiO<subscript>2</subscript>) prepared from ferrous sulfate precursor for Fischer–Tropsch (FT) synthesis, in which different amount of Fe<subscript>3</subscript>O<subscript>4</subscript> coexist with α-Fe<subscript>2</subscript>O<subscript>3</subscript>. The catalyst samples were characterized by BET, XRD, H<subscript>2</subscript>-TPR and Mössbauer effect spectroscopy (MES). The FT synthesis performance of the catalysts were carried out in a fixed bed reactor (FBR) under reaction conditions of 250 °C, 1.5 MPa, 2.0 nL/g-cat/h, and H<subscript>2</subscript>/CO=2/1 for 200 h. The results from XRD and MES for the catalyst samples of pre- and post-reduction indicate that more iron carbides form in the catalysts that have lower Fe<subscript>3</subscript>O<subscript>4</subscript> contents. H<subscript>2</subscript>-TPR for the catalysts displays that Fe<subscript>3</subscript>O<subscript>4</subscript> may facilitate the reduction of catalysts only when it was highly dispersed. FT reaction study in the FBR shows that the catalysts become more active with the decrease of Fe<subscript>3</subscript>O<subscript>4</subscript> contents in the catalysts. However, the catalyst with certain amount of highly dispersed Fe<subscript>3</subscript>O<subscript>4</subscript> exhibited high FT synthesis activity with CO conversion more than 75%. The catalyst also displayed much less olefins selectivity. A comparison of FTS performances of one of these catalysts with some known catalysts was also made in this paper. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1011372X
- Volume :
- 102
- Issue :
- 3/4
- Database :
- Complementary Index
- Journal :
- Catalysis Letters
- Publication Type :
- Academic Journal
- Accession number :
- 17608705
- Full Text :
- https://doi.org/10.1007/s10562-005-5858-2