Abstract

LOPEZ, Mónica; FORGIONNY, Angélica; LOPEZ, Diana  and  MORENO, Andrés. Mixed oxides of the type Co_x O_y/ MgO-Al₂O₃ and their promotion with ruthenium as catalysts for the Fischer Tropsch synthesis. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2014, vol.38, n.146, pp.93-103. ISSN 0370-3908.

In this work we evaluated the effect of the preparation method (auto-combustion vs impregnation), and of ruthenium as promoter (0.3 wt% Ru) for cobalt-based catalysts (10 wt% Co) supported on MgO-Al₂ O₃ mixed oxides on the Fischer-Tropsch synthesis (FTS). Cobalt supported on MgO and Al₂ O₃ were used as reference catalysts for the mixed oxides. The activity of the catalysts for the FTS was evaluated in a fixed-bed reactor at 260°C and atmospheric pressure. According to the results and independently from the preparation method,cobalt supported on MgO-Al₂ O₃ mixed oxides were more selective to heavy hydrocarbons (C₅₊) than catalysts supported on single (MgO or Al₂ O₃) oxides. Furthermore, all Ru-promoted catalysts were more active (i.e., had higher conversion) than non-promoted catalysts, and the selectivity to hydrocarbon fractions in the range of gasoline (C₁₁ - C₁₂) and diesel (C₂₁ - C₂₃) increased. In general, the results suggest that Ru-promoted Co/MgO-Al₂ O₃ catalyst is a promising catalytic system for the FTS.

Keywords : Fischer-Tropsch synthesis; mixed oxides; hydrotalcites.

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