Use of a catalyst comprising a beta silicon carbide support in a selective hydrodesulphurization process

Abstract

The invention concerns the use of supported catalysts comprising at least one metal or metallic compound of a metal from group VI and/or group VIII deposited on a support essentially constituted by β silicon carbide in a process for selective hydrodesulphurization of an olefinic hydrocarbon feed that is substantially free of polynuclear aromatics and metals. The invention can be used to carry out deep desulphurization of catalytically cracked gasoline cuts with very limited saturation of olefins and thus a minimum loss of octane number.

1 . Use of supported catalysts comprising at least one metal or metallic compound of a metal from the group formed by elements from group VIII and/or group VIB of the elements periodic table deposited on a support essentially constituted by β silicon carbide, in a process for selective hydrodesulphurization of an olefinic hydrocarbon feed that is substantially free of polynuclear aromatics and metals.  
     
     
         2 . Use according to  claim 1 , in a process for selective hydrodesulphurization of a feed with an end point of less than 260° C., comprising at least 5% by weight of olefins.  
     
     
         3 . Use according to  claim 2 , in a process for selective hydrodesulphurization of a feed boiling in the gasoline range.  
     
     
         4 . Use according to  claim 3 , in a process for selective hydrodesulphurization of a feed comprising at least 50% by weight of pyrolysis gasoline and/or fluid catalytic cracking gasoline.  
     
     
         5 . Use according to  claim 1 , in which the support has a specific surface area in the range 5 to 300 m 2 /g.  
     
     
         6 . Use according to  claim 1  in a process for selective hydrodesulphurization carried out under temperature conditions in the range 200° C. to 400° C., a pressure in the range 0.5 to 4 MPa, with a H 2 /feed ratio in the range 100 to 600 (litre/litre) and with an hourly mass flow rate of feed with respect to catalyst (WHSV) in the range 1 to 15 h −1 .