The characteristic IR spectra absorptions of the functional groups used to study FTS products. A typical FID chromatographic picture of the liquid hydrocarbon phase products for reaction in presence Fe/SiO2 (H2/CO = 2, GHSV = 4515 NmL∙g-1∙h-1, 20 bar, 280 °C). FTIR spectra of FTS liquid hydrocarbon phase obtained in presence of Fe/SiO2 (T= 240 °C, 260 °C, 280 °C, 300 °C). Typical 1H NMR and 13C NMR spectra of liquid hydrocarbon phase products obtained in presence of Fe/SiO2 (H2/CO = 2, GHSV = 4515 NmL g-1 h-1, 20 bar, 280 °C).