Structural properties and reduction behavior of Ni promoted FeMnK/SiO2 catalysts for Fischer-Tropsch synthesis

Abstract Ni promoter was introduced into the co-precipitated FeMnK/SiO 2 Fischer-Tropsch synthesis catalysts. The effects of Ni on catalyst structural properties, reduction and carburization behaviors were studied by N 2 physical adsorption, XRD, Mossbauer spectroscopy, temperature programmed reduction (TPR) in H 2 and CO, and isothermal reduction in syngas. The results indicate that Ni promoter increases the BET surface areas of catalysts and is favorable to the formation of smaller crystallite particles. H 2 -TPR results show that Ni decreases the reduction temperature of catalysts, and CO-TPR results show that Ni facilitates the oxygen removal and increases the carbon introduction content. These effects contribute to a significant improvement of the reduction and carburization behaviors of catalysts in syngas, and the promotion effect increases with the Ni loading content.