Abstract: Process for preparing a catalyst comprising a nickel active phase and an 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, which process comprises the following steps: a) said support is impregnated with a volume V1 of a heptanol 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 impregnated with a solution comprising a precursor of the nickel active phase in order to obtain a catalyst precursor; c) the catalyst precursor obtained at the end of step b) is dried at a temperature below 250° C.

Abstract: A process for preparing a catalyst comprising an active nickel phase and an 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, which process comprises the following steps: a) said support is impregnated with a volume V1 of a hexanol 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 impregnated with a solution comprising a precursor of the nickel active phase in order to obtain a catalyst precursor; c) the catalyst precursor obtained at the end of step b) is dried at a temperature below 250° C.

Abstract: Catalyst for the hydrogenation of aromatic compounds capable of being obtained by the process comprising at least the following stages: a) the alumina support is brought into contact with at least one organic additive; b) the alumina support is brought into contact with at least one nickel metal salt, the melting point of said metal salt of which is between 20° C. and 150° C.; c) the solid mixture obtained on conclusion of stages a) and b) is heated with stirring; d) the catalyst precursor obtained on conclusion of stage c) is dried; e) a stage of heat treatment of the dried catalyst precursor obtained on conclusion of stage d) is carried out.

Abstract: A selective hydrogenation catalyst that can be obtained by the process comprising at least the following steps: a) the alumina support is brought into contact with at least one organic additive; b) the alumina support is brought into contact with at least one nickel metal salt, the melting point of said metal salt of which is between 20° C. and 150° C.; c) the solid mixture obtained on conclusion of steps a) and b) is heated with stirring; d) the catalyst precursor on conclusion of step c) is dried; e) a step of heat treatment of the dried catalyst precursor obtained on conclusion of step d) is carried out.

Abstract: The invention relates to a process for preparing a catalyst based on an AFX zeolite exchanged with at least one transition metal, comprising at least the following steps: i) mixing, in an aqueous medium, of at least one source of silicon (Si) in SiO2 oxide form, at least one source of aluminum (Al) in Al2O3 oxide form, 1,6-bis(methylpiperidinium)hexane dihydroxide, and at least one source of at least one alkali metal, until a homogeneous precursor gel is obtained; ii) hydrothermal treatment at a temperature between 75° C. and 95° C., limits included; iii) at least one ion exchange with a solution comprising at least one species capable of releasing a transition metal, iv) heat treatment by drying followed by at least one calcination under a stream of air at a temperature between 400 and 700° C. The invention also relates to the catalyst obtained and to the use thereof for the selective reduction of NOx.

Abstract: The invention relates to a process for synthesizing a high-purity AFX zeolite, comprising at least the following steps: i) mixing, in an aqueous medium, of at least one source of silicon (Si) in SiO2 oxide form, at least one source of aluminum (Al) in Al2O3 oxide form, a nitrogenous organic compound of 1,6-bis(methylpiperidinium)hexane dihydroxide type, and at least one source of at least one alkali metal chosen from lithium, potassium or sodium, and the mixture of at least two of these metals, until a homogeneous precursor gel is obtained; ii) hydrothermal treatment of said precursor gel obtained at the end of step i) at a temperature of between 75° C. and 95° C., limits included, for a period of between 40 and 100 hours, limits included, to obtain a solid AFX-structure crystalline phase, termed “AFX zeolite”. The invention also relates to the high-purity AFX zeolite obtained.