Effect of operational conditions on the catalytic performance of Co-Mn/TiO2 nano catalyst for light olefins production

The catalyst containing 30wt.%(Co-Mn)/TiO2 nano catalysts were prepared by sol-gel method. The activity and selectivity of optimal catalyst were studied in different operational conditions. Theresults showed that the best operational conditions were the H2/CO=1/1 molar feed ratio at 250˚Cand GHSV=1300 h-1 under atmospheric pressure. The selectivity to ethylene decreased with increasing reaction temperature and reaction pressure. The catalyst was found to be superiorcatalyst in terms of better C2–C4 selectivity in the Fischer–Tropsch synthesis (FTS) products andhigher olefin/paraffin ratio (2.66) because of the facile formation of cobalt carbide during FTS reaction. The reaction conditions strongly influenced on the performance of the catalyst, and the product selectivity is changed markedly with the variation of GHSV in reaction atmosphere, particularly for light olefins. In addition, methane formation by using this catalyst was suppressed,which this caused decreasing of methane selectivity from 12.3 to 7.4%. Characterization of catalystwas carried out by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption measurements methods.

کلیدواژه ها:

Sol-gel ، Fisher-Tropsch synthesis ، Light olefins ، Operational condition