Process for preparing a reforming catalyst comprising a support, a group VIIIB metal and a group VIIB metal

A process for preparing a reforming catalyst comprising a support, a group VIIIB metal and a group VIIB metal, said process comprising the following steps in the order of 1) then 2) or 2) then 1):

• (1) a step for impregnating the support with an aqueous solution of hydrochloric acid comprising a group VIIIB metal;
• (2) a step for impregnating the support with
• a) an aqueous solution comprising a group VIIB metal and a sulphur-containing complexing agent in a reducing environment in order to form a coordination compound with said group VIIB metal, or
• b) with an aqueous solution comprising a group VIIB metal, then impregnating the resultant support containing the group VIIB metal with a solution comprising a sulphur-containing complexing agent in a reducing environment in order to form a coordination compound with said group VIIB metal;
• wherein the reducing environment in both (2)(a) and (2)(b) is constituted by:
• a reducing atmosphere comprising more than 0.1% by weight of a reducing gas or a mixture of reducing gases, or
• a reducing solution comprising, with respect to the group VIIB metal, in the range of 0.1 to 20 equivalents of one or more reducing metals, reducing organic compounds or inorganic reducing compounds,
• wherein the reducing environment is a reducing solution comprising at least one inorganic reducing phosphorus compound or at least one inorganic reducing nitrogen-containing compound, and/or
• wherein the sulphur-containing complexing agent in step (b) is a compound in which the sulphur is bonded to only one carbon atom.