Abstract
ABSTRACT Iron oxide Fischer-Tropsch catalysts were prepared using a sol-gel method to incorporate varying amounts of silica (SiO2) and a constant amount of potassium oxide (K2O) promoters. The sol-gel slurries containing different Fe/Si ratios were dried using a spray dryer. The spray-dried materials were calcined at 300°C prior to the use as catalysts for the Fischer-Tropsch reaction. Scanning electron microscopy (SEM), combined with energy dispersive X-ray spectroscopy (EDS) and elemental dot mapping (EDM) techniques, was utilized to characterize the structural morphology for these promoted iron oxide catalysts. The results indicate that the promoters (SiO2, k2O) are evenly distributed throughout the catalysts, and no agglomerated regions of iron, silica or potassium could be observed. Thus, the sol-gel preparation, followed by spray drying produces industrial catalysts of fine particle morphology and a uniform distribution of the promoters.
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