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• W2272189857 abstract "In low-temperature Fischer-Tropsch synthesis (FTS), hydrogen and carbon monoxide convert into hydrocarbons and water on cobalt based catalysts. Such catalysts lead predominantly to long-chained paraffinic waxes, which are hydrocracked downstream into valuable liquid fuels. However, in some cases, CO2 stemming from natural gas, partial oxidation or steam reforming and biomass gasification is a significant component in the syngas fed to the FT plants. Hence, the question arises if CO2 behaves as an active carbon source for Fischer-Tropsch products or if it acts only as diluting gas during the process. For exothermic Fischer-Tropsch reaction, multi tubular fixed bed reactors are favored in industrial application. However, such reactors tend to exhibit a significant pressure drop. Hence, catalyst particles between 1 and 5 mm are to be chosen. This leads inevitably to pore diffusion effects along the particle’s pores and, thus, to a gradient in the syngas ratio (H2/CO/CO2) inside the catalyst particle; the gradient affects the catalyst performance in terms of reaction rate and selectivity. For CO adsorbs more strongly at the active cobalt species, CO2 only adsorbs and converts in regions inside the catalyst particle where CO not available anymore due to total conversion. Therefore, we analyzed the reaction-diffusion performance of CO2-rich syngas in a single cobalt particle experimentally and verified our results by a mathematical single particle model, bringing in line the theoretical and experimental work. The characterization of the impact of transport pores on catalyst efficiency and productivity took place under intrinsic conditions as well as real diffusion affected conditions in a fixed bed reactor. The gradient of the synthesis gas ratio (H2/CO/CO2) inside a pellet was achieved by partial pressure variation at temperatures between 210 °C and 230 °C and total pressure of 3.0 MPa. With increasing surplus hydrogen, the methane selectivity rises if the CO concentration is lowered in the synthesis gas. At H2/CO-ratios > 10, CO2 also converts, but solely into methane. In order to characterize the effect of pore diffusion on catalyst efficiency, experiments with intact particles were conducted (H2/CO/CO2 = 2/1/1, T = 190240 °C, ptotal = 3.0 MPa). As long as CO is present in the center of the particle, CO2 behaves like an inert component. However, with increasing temperature the CO concentration gradient increases towards the center and regions free of CO form inside the particle. Here, CO2 is converted into mainly CH4 (selectivity of methane > 95 %C) resulting in a higher selectivity of CH4 compared to the results obtained with CO2-free syngas. The mathematical model derived is in very good agreement with the data using kinetic parameters from intrinsic experiments and explores CO-free regions where CO2 is converted and contributes to the product stream." @default.
• W2272189857 created "2016-06-24" @default.
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• W2272189857 date "2015-10-01" @default.
• W2272189857 modified "2023-09-27" @default.
• W2272189857 title "Fischer-Tropsch-Synthesis : Modelling of Reaction-diffusion in a single Cobalt Catalyst Particle Using CO2-rich Synthesis Gas" @default.
• W2272189857 hasPublicationYear "2015" @default.
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