Effect of the Type of the Cobalt-Containing Component of a Composite Catalyst on the One-Stage Synthesis of Liquid Hydrocarbons from СО and Н2

• Published in: Catalysis in industry 2019-10, Vol.11 (4), p.286-294
• Main Authors: Yakovenko, R. E., Zubkov, I. N., Narochnyi, G. B., Nekroenko, S. V., Savost’yanov, A. P.
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Catalysis; Catalysis in Chemical and Petrochemical Industry; Catalysts; Catalytic activity; Chemical synthesis; Chemistry; Chemistry and Materials Science; Cobalt; Deactivation; Fischer-Tropsch process; Gasoline; Hydrocarbons; Molecular weight distribution; Selectivity; Silicon dioxide; Titanium dioxide
• ISSN: 2070-0504; 2070-0555
• DOI: 10.1134/S2070050419040093

The effect of the type of the cobalt-containing component (Со-Al 2 O 3 /SiO 2 , Co-Re/Al 2 O 3 , and Co-Re/TiO 2 ) of a composite catalyst on the combined synthesis and hydroconversion of hydrocarbons by the Fischer–Tropsch process are investigated. The catalytic properties of catalyst samples are studied in a flow reactor with a fixed catalyst layer at 2 MPa and GHSV of 1000 h –1 within a the temperature range of 240–280°С for 40–90 h of continuous operation. The highest values of output and selectivity to C 5+ hydrocarbons are obtained for composite catalyst Со-Al 2 O 3 /SiO 2 (35%)/ZSM-5(30%)/Al 2 O 3 (30%) at a temperature of 240°C and are 106 kg/( h) and 67.1%, respectively. It is shown that using Co-Re/Al 2 O 3 instead of Со-Al 2 O 3 /SiO 2 catalyst produces comparable values of catalytic activity, but considerably fewer unsaturated hydrocarbons are found in the products of synthesis. Using Co-Re/TiO 2 catalyst and raising the temperature (to 280°С) shifts the molecular weight distribution of the products of synthesis toward the formation of a gasoline fraction. It is found that the rate of catalyst deactivation grows in the order Со-Al 2 O 3 /SiO 2 > Co-Re/Al 2 O 3 > Co-Re/TiO 2 .