Effect of Mg/Al Ratio on Catalytic Behavior of Fischer–Tropsch Cobalt-Based Catalysts Obtained from Hydrotalcites Precursors

摘要: Layered double hydroxides of the hydrotalcite (HT)-type materials have been considered as promising supports for Co-based Fischer–Tropsch synthesis (FTS) catalysts. In this work effect Mg/Al ratio on catalytic behavior cobalt-based catalysts obtained from HTs precursors studied. Cobalt supported Mg–Al oxides were prepared by wet impregnation method and calcined at 300 °C. The textural, structural reducibility properties samples characterized using different techniques. FTS was evaluated in a down-flow fixed-bed reactor 20 bar, 250 °C H2/CO ≈ 2 molar ratio. All active stable during 72 h testing time. stability improved presence magnesium alumina support; however CO conversion negatively affected increasing cobalt decreased increased, probably due to strong Co–O–Mg interaction evidenced formation CoxOy–MgO mixed oxide. Furthermore, activity correlated with H2-chemisorption measurements. results suggest that highly FTS.