Process for pretreating a catalyst based on an EUO zeolite under severe conditions

A process for pretreating a catalyst used in an isomerization process of a feed that contains at least one aromatic compound having 8 carbon atoms, the process comprising the following steps:

• a) pretreating a catalyst containing at least one zeolite with structure type EUO and at least one hydrodehydrogenating metal while converting a hydrocarbon feed that contains at least one aromatic compound containing 8 carbon atoms, at a temperature whereby a catalyst comprising carbon is obtained for a period of 72 to 120 hours;
• b) then continuing converting the hydrocarbon feed with the catalyst at a temperature which is lower than the temperature applied in a), and at a pressure that is at least 0.3 MPa lower than the pressure applied in a).

A process for pretreating a catalyst used in an isomerization process of a feed that contains at least one aromatic compound having 8 carbon atoms in which the at least one aromatic compound containing 8 carbon atoms is selected from the group consisting of para-xylene, ortho-xylene, meta-xylene and ethylbenzene, the process comprising the following steps:

• a) pretreating a catalyst containing at least one zeolite with structure type EUO and at least one hydrodehydrogenating metal while converting a hydrocarbon feed that contains at least one aromatic compound containing 8 carbon atoms, at a temperature whereby a catalyst comprising carbon is obtained for a period of 72 to 120 hours;
• b) then continuing converting the hydrocarbon feed with the catalyst at a temperature which is lower than the temperature applied in a).