Abstract
The synthesis of C5+ hydrocarbons, including unsaturated ones, on the Co-Al2O3/SiO2 catalyst was studied in flow and flow-circulation operation modes at a pressure of 2.0 MPa, a gas space velocity of 1000 h–1, H2/CO ratios in the initial gas of 2.0, 1.85, and 1.70, circulation rate of 4–16. It was determined that the maximum parameters of the synthesizing C5+ hydrocarbons from CO and H2 on this catalyst—CO conversion, selectivity, and performance for C5+ products—are detected at a circulation rate of 8 over a whole range of the studied H2/CO ratios in the initial syngas. The content of olefins in the synthesis products was found to increase to ~30 wt % when using the circulation rate of 8–16. It was found that upon the synthesis of hydrocarbons by the Fischer–Tropsch method in the flow-circulation mode, the rate of catalyst deactivation diminishes, which may be due to a decrease in the partial pressure of water in the reaction zone.
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Funding
The study was carried out with the financial support of the Russian Foundation for Basic Research within the framework of scientific project no. 20-33-90149 and the Ministry of Education and Science, Russian Federation within the framework of the state problem FENN-2020-0021 (application no. 2019-0990) using the equipment of the Central Collective Use Center “Nanotechnologies” of the Platov South-Russian State Polytechnic University (NPI).
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I.N. Zubkov: catalyst synthesis, organization of shift work for experimental studies, participation in summarizing the results of experimental studies, preparation of the article text; A.P. Savostyanov: determination of the research goal and setting of tasks, establishment of dependencies between a set of operational parameters and catalyst activity; R.E. Yakovenko: development of a methodology for conducting a study of catalytic activity, carrying out calculations to determine the partial water pressure depending on the technological mode; V.N. Soromotin: development of a method for analyzing the composition of condensed synthesis products, interpretation of the results of the study; O.D. Denisov: conducting research by the thermally programmed oxidation method, establishing the causes of changes in the catalyst deactivation rate and the state of the active component of catalysts at selected operational parameters; S.S. Demchenko: fractionation and determination of the composition of condensed synthesis products by capillary gas-liquid chromatography-mass spectrometry, analysis of the causes of changes in the group composition of products depending on the syngas composition and the operating mode of the reactor.
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Translated from Zhurnal Prikladnoi Khimii, Nos. 11–12, pp. 1382–1388, August, 2022 https://doi.org/10.31857/S0044461822110020
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Zubkov, I.N., Savost’yanov, A.P., Soromotin, V.N. et al. Selective Synthesis of Olefins on a Co-Al2O3/SiO2 Catalyst by the Fisher–Tropsch Method. Russ J Appl Chem 95, 1776–1789 (2022). https://doi.org/10.1134/S1070427222120047
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DOI: https://doi.org/10.1134/S1070427222120047