Effect of the Calcination Temperature on the Structural Properties and Catalytic Activity in the Fe/SiO2 System

N. G. GALLEGOS, J. F. BENGOA, M. V. CAGNOLI, A. M. ALVAREZ, R. C. MERCADER AND S. G. MARCHETTI

Madrid

Conferencia; Industrial Applications of the Mössbauer Effect; 2004

The structural properties of iron supported catalysts have strong influence on their activity and selectivity in the Fischer-Tropsch synthesis. We have studied the influence of the calcination temperature on the oxide-support interaction degree to reach the highest iron reducibility in Fe/SiO2 system to obtain the highest catalytic activity and selectivity. A silica was impregnated with an aqueous iron solution and it was calcined at 698, 898 and 1098 K. The three precursors were characterized by Mössbauer spectroscopy, obtaining different iron oxide species on the support. They were reduced in H2 to produce three catalysts characterized by CO Chemisorption, Volumetric Oxidation and Mössbauer Spectroscopy. The activity and selectivity measurements showed that the calcination temperature increase led to a lower hydrocarbon production, a decrease of olefins production and an increase of methane.