Dynamics of topochemical reactions in supported iron Fischer–Tropsch synthesis catalysts during their reduction in flowing CO and CO + H2

Resumo

The reduction of Fe₂O₃/SiO₂ catalysts in flowing CO and CO + H₂ in the temperature-programmed and isothermal modes has been investigated by in situ magnetization measurements. The process takes place in two steps, successively yielding magnetite and Hägg carbide. The carbide concentration in the case of reduction with CO is higher than in the case of reduction with the CO + H₂. This is assumed to be due to the formation of Fe₂SiO₄ in the reduction of the catalysts with CO + H₂.