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Elena Echeverria1 3 Abdulbaset Alayat2 David McIlroy1 Armando McDonald2 3

1, Oklahoma State University, Stillwater, Oklahoma, United States
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.

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