Process for the preparation of a catalyst, catalyst and its use in a hydroconversion and/or hydrotreatment process
The invention concerns a process for the preparation of a catalyst starting from a pre-catalyst comprising at least one catalytic metal and a support, said pre-catalyst having undergone a heat treatment at at least 60° C. without calcining, in which process said pre-catalyst is impregnated with a basic solution having a pH of more than 7.5 and containing at least one molecule in the zwitterionic form, and the impregnated pre-catalyst is dried at a temperature of at most 240° C. without subsequent calcining. The molecule in the zeolite form is selected from the group formed by amino-alcohol acids containing secondary or tertiary amine groups and containing at least one carboxylic acid function (and preferably only one) and at least one alcohol function. It is bicine or tricine, for example. The invention also concerns the catalyst prepared using this process, and its use in hydrotreatment and/or hydroconversion.
1. A process for the preparation of a catalyst starting from a pre-catalyst comprising at least one catalytic metal and a support, said pre-catalyst having undergone a heat treatment at at least 60° C. without calcining, in which process said pre-catalyst is impregnated with a basic solution having a pH of more than 7.5 and containing at least one molecule in the zwitterionic form, and the impregnated pre-catalyst is dried at a temperature of at most 240° C. without subsequent calcining, and the molecule in the zwitterionic form is selected from the group formed by amino-alcohol acids containing secondary or tertiary amine groups and containing at least one carboxylic acid function and at least one alcohol function.
2. The process according to claim 1 , in which said molecule has a single carboxylic acid function.
3. The process according to claim 1 , in which the molecule in the zwitterionic form is bicine.
4. The process according to claim 1 , in which the molecule in the zwitterionic form is tricine.
5. The process according to claim 1 , in which impregnation is carried out at a pH of more than 8.5.
6. The process according to claim 5 , in which the base is ammonia.
7. The process according to claim 1 , in which after impregnation, the pre-catalyst undergoes a maturation step.
8. The process according to claim 1 , in which drying is carried out at a temperature in the range of 50° C. to 240° C.
9. The process according to claim 1 , in which said pre-catalyst comprises at least one catalytic metal selected from the group formed by metals from group VIB and non-noble group VIII, and optionally comprises phosphorus.
10. The process according to claim 9 , in which said pre-catalyst also comprises boron and/or silicon.
11. The process according to claim 1 , in which said molecule is added in a quantity such that the molecule/GVIB molar ratio is in the range of 0.05 to 2.0.
12. The process according to claim 1 , in which said pre-catalyst has been prepared by dry impregnation of said support with a solution of said catalytic metal.
13. The process according to claim 1 , in which said pre-catalyst has been heat treated at a temperature in the range of 60° C. to 220° C.
14. The process according to claim 1 , in which said catalyst undergoes sulphurization after said drying.
15. A catalyst which is susceptible of being prepared using the process in accordance with claim 1 .
16. A process for the hydrotreatment and/or hydroconversion of a hydrocarbon feed by bringing said feed into contact with the catalyst according to claim 15 , in which process said catalyst contains at least one metal from group VIB and at least one metal from group VIII and said metals are in the sulphide form.
17. The process according to claim 1 , in which impregnation is carried out at a pH of more than 10.
18. The process according to claim 1 , in which after impregnation, the pre-catalyst undergoes a maturation step for 0.1 to 10 h and at a temperature of 15° C. to 80° C.
19. The process according to claim 1 , in which said pre-catalyst comprises at least one catalytic metal selected from the group formed by metals from group VIB and non-noble group VIII, and comprises phosphorus.
20. The process according to claim 1 , in which said molecule is added in a quantity such that the molecule/Mo molar ratio is in the range of 0.05 to 2.0.