A Catalyst for Selective Hydrotreatment of Non-Prefractionated FCC Gasoline

A new CoMo catalyst was developed for selective hydrotreatment of FCC gasoline to provide no more than 10 ppm of sulfur in the hydrotreated gasoline and no more than 1,0 point RON decrease against the initial RON. The new catalyst allows the FCC gasoline not to be prefractionated into light and heavy fractions before its hydrotreatment. The hydrotreatment conditions are as follows: feed flow rate 2,2 h–1, 270 °C, 2,5 MPa, H₂/feed = 150 m³/m³. The high degree of hydrodesulfurization at a minimal decrease in RON is achieved owing to the high catalyst activity to hydrodesulfurization of the sulfur-containing components and to conversion of reactive high-octane olefins of the FCC gasoline to their less reactive derivatives with the high octane numbers. The catalyst is a CoMoS phase on the support containing amorphous aluminosilicate and γ-Al₂O₃. The method for the catalyst preparation is adapted to the Russian industrial facilities and to the feedstock available in Russia. Application of the hydrotreatment process based on this catalyst does not need considerable reconstruction of the facilities available at Russian refineries but provide residual sulfur content less than 10 ppm in the hydrotreated FCC gasoline.

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