CATALYST FOR RECEIVING SYNTHETIC LIGHT OLEFINS C-C FROM SYNTHESIS GAS AND METHOD OF ITS OBTAINING Russian patent published in 2019 - IPC B01J23/74 B01J21/04 B01J35/10 B01J37/02 C07C1/04 

FIELD: chemistry.

SUBSTANCE: catalyst for receiving the light olefins C₂-C₄ according to the Fischer-Tropsch method, it contains cobalt and iron on a mesoporous carrier, that is a mesoporous alumina with an average pore diameter of 6–12 nm and a total pore volume of 0.85–1.10 cm³/g, share of mesopores not less than 90 % and specific surface area of 250–315 m². Mass ratio of cobalt:iron in the calcined catalyst is in the range of 1.0–9.0. Catalyst is prepared by stepwise impregnation of the carrier with aqueous solutions of the precursors of the active compounds of cobalt and iron – cobalt and iron nitrates. Each stage of impregnation is carried out after preliminary evacuation of the carrier or catalyst precursor to a residual vacuum of 1.0–2.5 kPa and with stirring the carrier or catalyst precursor at temperature of 60–80 °C for 0.5–4 hours in excess compared with the pore volume of the carrier volume of the precursor solution of active compounds. Solution is filtered under vacuum with a residual pressure of 1.0–2.5 kPa, the catalyst precursor is dried at temperature of 40–90 °C for 3–8 h and calcined it at temperature of 300–450 °C for 3–12 hours after each step of applying the active compound. Mesoporous carrier is prepared by dissolving aluminum isopropoxide in isopropyl alcohol with the addition of ammonium hydroxide. Resulting mixture is stirred for 5–8 hours at temperature of 80–90 °C to gel formation at a molar ratio of the components in solution Al(i-OC₃H₇)₃:i-C₃H₇OH:NH₄OH=1:1.0–4.0:1.5–2.5. Then it is dried at temperature of 95–110 °C for 1–4 hours and calcined at temperature of 400–500 °C for 1–4 hours.

EFFECT: technical result from the implementation of this invention is to achieve the performance of the developed catalyst for light olefins C₂-C₄, obtained from synthesis gas by the Fischer-Tropsch method, more than 80 kg/m³_cat⋅h.

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