Abstract
Two spherical iron-based catalysts (Fe/Cu/K/SiO 2 and Fe/Cu/K/Al 2O 3) were prepared by the combination of coprecipitation and spray drying method for the application of slurry Fischer–Tropsch synthesis (FTS). The effects of SiO 2 and Al 2O 3 on the reduction and the carburization behaviors of iron-based catalysts were studied using temperature-programmed desorption (TPD) in H 2 and CO, isothermal reduction in syngas, and Mössbauer-effect spectroscopy (MES). The results indicate that SiO 2 suppresses the H 2 adsorption, facilitates the CO adsorption, and the carburization as compared with Al 2O 3. The FTS performances of the catalysts were evaluated in a slurry reactor under the industrial relevant reaction conditions of 260°C, 1.5 MPa, H 2/CO = 0.67, and a space velocity of 2000 h −1. This indicates that SiO 2-supported catalyst has higher FTS activity, higher water-gas shift reaction (WGS) reactivity, and higher selectivities to heavy hydrocarbons. Furthermore, the run stability of Al 2O 3 supported, iron-based catalyst is better than SiO 2 supported catalyst.
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