Method for preparing a catalyst comprising an active nickel phase distributed in a shell

Patent metadata

Field	Value
Publication number	US-12453965-B2
Application number	US-202117923348-A
Country	US
Kind code	B2
Filing date	May 18, 2021
Priority date	May 29, 2020
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A process for preparing a catalyst comprising an active phase based on nickel and an alumina support, which process comprises the following steps:
a) said support is impregnated with a volume V1 of a butanol solution of between 0.2 and 0.8 times the total pore volume TPV of said support in order to obtain an impregnated support; b) the impregnated support obtained at the end of step a) is left to mature for 0.5 to 40 hours; c) the matured impregnated support obtained at the end of step b) is impregnated with a solution comprising at least one precursor of the nickel active phase in order to obtain a catalyst precursor; d) the catalyst precursor obtained at the end of step c) is dried at a temperature below 250° C.

First claim

The invention claimed is:

1. A process for preparing a catalyst comprising an active phase based on nickel and alumina support, said catalyst comprising between 1% and 50% by weight of elemental nickel relative to the total weight of the catalyst, the nickel being distributed both over a crust at the periphery of the support, and at the core of the support, the thickness of said crust being between 2% and 15% of the diameter of the catalyst, the size of the nickel particles in the catalyst, measured in oxide form, being between 7 nm and 25 nm, which process comprises the following steps:
a) said support is impregnated with a volume V1 of a butanol solution of between 0.2 and 0.8 times the total pore volume TPV of said support in order to obtain an impregnated support;
b) the impregnated support obtained at the end of step a) is left to mature for 0.5 hour to 40 hours;
c) the matured impregnated support obtained at the end of step b) is impregnated with a solution comprising at least one precursor of the nickel active phase in order to obtain a catalyst precursor;
d) the catalyst precursor obtained at the end of step c) is dried at a temperature below 250° C.

2. The process as claimed in claim 1 , wherein, in step c), the volume V2 of the solution comprising at least one precursor of the nickel active phase impregnated on the matured impregnated support obtained at the end of step b) is such that V2=TPV−V1.

3. The process as claimed in claim 1 , wherein step b) is carried out at a temperature below or equal to 60° C.

4. The process as claimed in claim 1 , wherein, in step a), the butanol solution is an n-butanol solution.

5. The process as claimed in claim 1 , wherein step d) is carried out for a time of between 0.5 hour and 12 hours.

6. The process as claimed in claim 1 , further comprising a step e) in which the catalyst obtained at the end of step d) is calcined at a temperature of between 250° C. and 600° C.

7. The process as claimed in claim 6 , wherein step e) is carried out for between 0.5 hour and 24 hours.

8. The process as claimed in claim 1 , wherein, in step a), said volume V1 of said butanol solution is between 0.25 and 0.75 times the total pore volume TPV of said support.

9. The process as claimed in claim 1 , wherein the precursor of the nickel active phase is nickel nitrate, nickel chloride, nickel acetate or nickel hydroxycarbonate.

10. The process as claimed in claim 1 , wherein the catalyst has a specific surface area of between 10 m 2 /g and 350 m 2 /g.

Assignees

• Ifp Energies Now

Inventors

• Boualleg Malika

Classifications

• B01J35/613

  10-100 m2/g · CPC title

• B01J35/397

  Egg shell like · CPC title

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• B01J23/755 Primary

  Nickel · CPC title

• B01J21/04

  Alumina · CPC title