Journal
JOURNAL OF CATALYSIS
Volume 278, Issue 2, Pages 310-320Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.12.017
Keywords
Fischer-Tropsch Synthesis; Fe/SBA-15; Activation atmosphere; Mossbauer spectroscopy
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Funding
- ANPCyT [22-38337, 00549]
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An iron catalyst supported on SBA-15 was prepared and activated in H-2 stream and in synthesis gas (H-2:CO = 2:1) stream, in order to be used in the Fischer-Tropsch Synthesis. The different activation treatments led to different Fe species in fresh catalysts: alpha-Fe, Fe3O4 and Fe2+ diffused into the SBA-15 walls in H2-Fe/SBA-15 and chi-Fe5C2, Fe3O4 and Fe2+ in H2:CO-Fe/SBA-15. These initial differences in the bulk structure of the solids disappear when both catalysts are working. However, a higher production of total hydrocarbons, higher CO conversion and more CH4 and light gases were obtained for H2-Fe/SBA-15 over 6 days. Besides, a higher selectivity toward light olefins was obtained with H2-Fe/SBA-15 during the first 24 h on reaction stream, but this selectivity decreases with the reaction time. These results are explained considering that the iron carbides produced from alpha-Fe are more active and/or have smaller sizes than that obtained from alpha-Fe2O3. (C) 2010 Elsevier Inc. All rights reserved.
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