RECOVERY OF HIGH MOLECULAR HYDROCARBONS FROM SYNTHESIS GAS AND PHYSICO-CHEMICAL CHARACTERISTICS OF THE CATALYST
Avainsanat:
syngas, high molecular hydrocarbons, catalyst, IR spectrum, diffractogram.Abstrakti
In the article, the reaction of obtaining high molecular hydrocarbons from synthesis gas and the physicochemical characteristics of the Co-Fe-Ni-SiO2/YuKTs catalyst used in this process are studied. The increase in selectivity in methane formation is, on the one hand, the result of the acceleration of the hydrogenation reaction of CO in the centers of methane formation due to the increase in the synthesis temperature and the diffusion of CO and N2 at different speeds through the pores of zeolite. A large amount of products of secondary changes (cracking, isomerization) - isoparaffins and olefins - was found in all fractions of hydrocarbons synthesized in the presence of hybrid catalysts. The largest amount of isoparaffins was recorded for the composite catalyst - the iso/n parameter is equal to 0.6, which indicates its increased activity compared to the catalysts absorbed in the hydroremediation reactions. A higher concentration of olefins was found for catalysts with low cobalt content, which is due to their low hydrogenation capacity compared to unsaturated hydrocarbons. In absorbent catalysts, hydrocarbon synthesis centers and zeolitic acid sites are in close contact with each other, which should contribute to the enhancement of secondary processes.
Lataukset
Lähdeviitteet
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