CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
EFFECT OF THE ACTIVATION ATMOSPHERE IN THE ACTIVITY OF FE CATALYSTS SUPPORTED ON SBA-15 IN THE FISCHER-TROPSCH SYNTHESIS.
LEONARDO A. CANO, MARíA V. CAGNOLI, JOSé F. BENGOA, ANA M. ALVAREZ, SERGIO G. MARCHETTI
JOURNAL OF CATALYSIS
ELSEVIER SCIENCE BV
Año: 2011 vol. 278 p. 310 - 310
An iron catalyst supported on SBA-15 was prepared and activated in H2 stream and in synthesis gas (H2:CO = 2:1) stream, in order to be used in the FischerTropsch Synthesis. The different activation treatments led to different Fe species in fresh catalysts: a-Fe, Fe3O4 and Fe2+ diffused into the SBA-15 walls in H2-Fe/SBA-15 and Fe5C2, Fe3O4 and Fe2+ in H2:COFe/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. This results are explained considering that the iron carbides produced from alfa iron are more active and - or have smaller sizes than that obtained from alfa hematite.