Abstract
Studying the kinetics of the Fischer-Tropsch process is a rather important task, since this process is very sensitive to the temperature mode, as well as to the characteristics of the catalyst. In addition, a given process is accompanied by many side reactions that negatively affect the rate and selectivity of the reaction. The Fischer-Tropsch synthesis is an alternative source for obtaining high-quality fuel from coal or biomass rather than petroleum. Therefore, investigating the kinetics of the Fischer-Tropsch reaction, in order to improve the selectivity and activity of catalysts, and to determine the rate constants of chemical reactions, is a relevant problem. The choice of the catalyst is one of the main factors affecting the quality and product yield for the Fischer-Tropsch synthesis. We fabricated two samples of cobalt catalysts for conducting the experiments. The first sample of the catalyst Со/γ-Al 2 O 3 contains cobalt nanoparticles of the same size. The second sample of the catalyst (Со)/γ-Al 2 O 3 was obtained by the method of impregnating the carrier with a solution of cobalt nitrate. The catalyst, obtained through the method of impregnation of (Со)/γ-Al 2 O 3 , demonstrated a higher activity, larger by an order of magnitude than the monodispersed catalysts. However, the monodispersed catalyst showed high selectivity for the lower hydrocarbons. In order to calculate the kinetics of the Fischer-Tropsch process and to find the reaction rate constants, we developed a software module in the programming environment MS Visual Studio 2017 in the programming language C# using the .NET Framework v4.6 technologies. By using the developed program module, we calculated reaction rate constants of the Fischer-Tropsch process. After analyzing the data obtained, one can see that the relative error is within 2…3 %, demonstrating the adequacy of the proposed model to solve the inverse problem of chemical kinetics. Therefore, we can state that a given model for the calculation of rate constants could be applied to study the Fischer-Tropsch process.
Highlights
At present, the processes for obtaining a synthetic liquid fuel from gases that contain a mixture of carbon monoxide and hydrogen include the Fischer-Tropsch process (FT-synthesis) [14]
The process is named after Franz Fischer and Hans Tropsch [3, 4], who showed the possibility of this reaction in 1923, by converting a mixture of carbon monoxide and hydrogen into hydrocarbons using an iron catalyst
We shall write for the kinetic system: knowing the total amount of a substance at the outlet from the reactor and the molar concentration of СН4, we find from formulae (21) and (23) the amount and mass of the formed methane: NC1=2.74∙10–4∙1.382∙10–4=3.79∙10–7, mC1=3.79∙10–716=6.071∙10–6
Summary
The processes for obtaining a synthetic liquid fuel from gases that contain a mixture of carbon monoxide and hydrogen include the Fischer-Tropsch process (FT-synthesis) [14]. The Fischer-Tropsch synthesis is an important technology, aimed at converting coal, natural gas, or biomass, into valuable products, such as motor fuels or raw materials for petrochemicals [1, 3]. Studying the kinetics of the Fischer-Tropsch process is a very important task, as a given process is very sensitive to a temperature mode, as well as characteristics of the catalyst. This process is accompanied by many side reactions that negatively affect the rate and selectivity of the reaction. Studies into FT-synthesis, aimed at enhancing the selectivity and activity of catalysts, determining the rate constants of chemical reactions, are relevant
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
