EFFECT OF THE SUPPORT AND PROMOTERS IN FISCHER-TROPSCH SYNTHESIS USING SUPPORTED FE CATALYSTS

LEONARDO ANDRES CANO; ANDRES GARCIA BLANCO; GERMAN LENER; SERGIO MARCHETTI; KARIM SAPAG

CATALYSIS TODAY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2017 vol. 282 p. 204 - 213

0920-5861

The effect of support and promoters on the catalytic propertiesof Fe supported in the FTS was studied. Precursors of supported Fe onSiO2 and SBA -15 were synthesized and doped with Cu and K. The precursorswere activated in pure H2 and catalytically tested with a mixture ofH2:CO=2:1, T=543K and P=10bar. The samples were characterized by atomicabsorption, N2 adsorption, X-ray diffraction, TEM spectroscopy and TPR.Also, we used the DFT to study the changes of the electronic structurewhen the Fe, K and Cu are adsorbed on the SBA-15 surface. Theincorporation of different ions do not alter the structural and texturalproperties of the support. In the FTS, all the catalysts supported onSBA-15 presented a low selectivity towards methane and a promisinghydrocarbon production in the range of gasoline, showing positive effectof the support for iron catalysts for the FTS reaction. The activityorder obtained was: Fe/K-SBA-15> Fe/Cu-SBA-15 ≈ Fe-SBA-15 > Fe-SiO2,which is the same order for the selectivity towards olefins. The presenceof K on the SBA-15 surface increases the activity and selectivity towardsolefins; an effect that can be attributed to the electrostatic effectgenerated by the alkaline ions.