3, University of Idaho, Moscow, Idaho, United States
2, University of Idaho, Moscow, Idaho, United States
The effect of promoter addition on iron supported on silica nanosprings (Fe/NS) catalyst for Fischer-Tropsch synthesis (FTS) is investigated. The Fe/NS catalysts with the different metal loading were synthesized by the incipient wetness impregnation technique. The catalyst promoters examined were cobalt (Co), molybdenum (Mo), copper (Cu) and ruthenium (Ru). The physico-chemical properties of the prepared catalysts were characterized before the FT reaction by: BET surface area anlaysis, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), hydrogen temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The FTS performance of the Fe/NS and promoted catalysts were examined in a quartz fixed-bed microreactor (H2/CO of 2:1, 250 oC and atmospheric pressure) and the products trapped and analyzed by GC-TCD and GC-MS to determine CO conversion and reaction selectivity. The characterization results obtained indicated that the promoted of Fe/NS catalyst with Co, Mo, Cu and Ru oxides enhanced the catalytic activity of Fe/NS catalyst and the selectivity towards hydrocarbons liquid fuels in the C6 to C16 range compared to the control Fe/NS catalyst. The Ru and Mo promoted Fe/NS catalysts were shown to be best performing FTS catalysts.