Effect of the Support and Promoters in Fischer-Tropsch Synthesis using Supported Fe catalysts

G. LENER; A. A. GARCIA BLANCO; K. SAPAG; L. A. CANO; S. G. MARCHETTI

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 properties of Fe supported in the FTS was studied. Precursors of supported Fe on SiO2 and SBA −15 were synthesized and doped with Cu and K. The precursors were activated in pure H2 and catalytically tested with a mixture of H2:CO = 2:1, T = 543 K and P = 10 bar. The samples were characterized by atomic absorption, N2 adsorption, X-ray diffraction, TEM and TPR. Also, we used the DFT to study the changes of the electronic structure when the Fe, K and Cu are adsorbed on the SBA-15 surface. The incorporation of different ions do not alter the structural and textural properties of the support. In the FTS, all the catalysts supported on SBA-15 presented a low selectivity towards methane and a promising hydrocarbon production in the range of gasoline, showing positive effect of the support for iron catalysts for the FTS reaction. The activity order 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 presence of K on the SBA-15 surface increases the activity and selectivity towards olefins; an effect that can be attributed to the electrostatic effect generated by the alkaline ions.