(521cu) Promotion of Co/SiO? Fischer–Tropsch Catalysts By Manganese and Platinum

Fischer-Tropsch Synthesis (FTS) is an important process that converts syngas (carbon monoxide and hydrogen) to produce fuels and chemicals. In this scenario, cobalt-based Fischer-Tropsch catalysts show many benefits such as high activity, low water–gas shift activity and they are used in industrial applications. In heterogeneous catalysis, the support, the promoters, the preparation of the catalyst, and the reaction conditions are key factors that can affect the catalytic performance. SiO₂, used as support for cobalt catalysts shows a weaker metal-support interaction, and for this reason, it is commonly used in Co catalysts. A challenge is in developing active and stable catalysts with high selectivity since many catalysts suffer from deactivation, especially at high conversions where steam oxidizes Co to a less active surface state.

The use of promoters in Co/SiOâ‚‚ can enhance the catalytic performance of cobalt catalysts to FTS. Noble metals such as platinum are responsible for contributing to a higher degree of reduction of cobalt oxide at a lower temperature. Furthermore, the promotion of Co/SiOâ‚‚ with Mn can enhance the selectivity of Câ‚…+ products and decrease the methane yields.

This study aims to determine the effects of the synergic promotion of Co/SiOâ‚‚ by manganese and platinum in the activity, selectivity, and stability of this FTS catalyst. Catalyst preparation is done by incipient wetness impregnation and the variables pressure, temperature, and Hâ‚‚/CO molar feed ratio on the catalytic performance are evaluated. The characterization methods in this study are powder X-ray Diffraction (XRD), Temperature-Programmed Reduction (TPR), Transmission Electron Microscopy (TEM), and Energy Dispersive Spectroscopy (EDS).