Abstract: A process is described for preparing a catalyst comprising at least one porous support and at least one metallic phase containing nickel and tin in a proportion such that the Sn/Ni molar ratio is in the range 0.01 to 0.2, said process comprising at least the following steps in succession: a) depositing nickel on at least said support in order to obtain a supported nickel-based monometallic catalyst; b) reducing said monometallic catalyst in the presence of at least one reducing gas; c) depositing, in the gas phase and in the presence of at least one reducing gas, at least one organometallic tin compound onto said reduced monometallic catalyst; and d) activating the solid derived from said step c) in the presence of at least one reducing gas.

Abstract: The present invention relates to a process for producing a structured porous material comprising a structured inorganic framework made up of metal-oxide based walls in which nanoparticles of metal 0 are incorporated, which comprises the following steps: a) formation of a suspension of hydrophilic nanoparticles of metal 0 stabilized by non-exchangeable ligands that give the nanoparticles their hydrophilic character; b) growth of the inorganic framework from an inorganic precursor around the nanoparticles of metal 0 stabilized by the non-exchangeable hydrophilic ligands, in the presence of a pore-forming agent; and c) elimination of the pore-forming agent and at least partially of the non-exchangeable ligands that give the nanoparticles their hydrophilic character.

Abstract: The invention relates to a method of reducing the ionic metal content of aqueous effluents. The inventive method consists in bringing an aqueous effluent loaded with metal ions into contact with at least one hydrogen-covered metal.

Abstract: A process is described for preparing a catalyst comprising at least one porous support and at least one metallic phase containing nickel and tin in a proportion such that the Sn/Ni molar ratio is in the range 0.01 to 0.2, said process comprising at least the following steps in succession: a) depositing nickel on at least said support in order to obtain a supported nickel-based monometallic catalyst; b) reducing said monometallic catalyst in the presence of at least one reducing gas; c) depositing, in the gas phase and in the presence of at least one reducing gas, at least one organometallic tin compound onto said reduced monometallic catalyst; and d) activating the solid derived from said step c) in the presence of at least one reducing gas.

Abstract: A process is described for preparing a catalyst comprising at least one porous support and at least one metallic phase containing nickel and at least one metal M from group IB in a proportion such that the molar ratio M/Ni is in the range 0.005 to 0.5, said process comprising at least the following steps in succession: a1) depositing nickel on at least said support in order to obtain a supported nickel-based monometallic catalyst; b1) depositing, in the presence of at least one reducing gas and in the absence of any aqueous solvent, at least one organometallic compound of at least said metal M onto said monometallic catalyst.

Abstract: Method for the elimination of metal ions from aqueous media, such as zinc, lead, chrome, copper, iron, aluminium, manganese, cadmium, cerium or silver and mixtures of the metals present in a trace or ultratrace state in aqueous effluents, by adsorption on a solid charge containing a metal chosen from group VIII.

Abstract: The invention relates to a method of reducing the ionic metal content of aqueous effluents. The inventive method consists in bringing an aqueous effluent loaded with metal ions into contact with at least one hydrogen-covered metal.

Abstract: The invention relates to a method for the elimination of metal ions from aqueous media such as zinc, lead, chrome, copper, iron, aluminium, manganese, cadmium, cerium or silver and mixtures of said metals present in a trace or ultratrace state in aqueous effluents, by adsorption on a solid charge containing a metal chosen from group VIII.

Abstract: In a process for preparing a catalyst comprising at least one support, at least one metal from group VIII of the periodic table and at least one additional element M selected from the group formed by germanium, tin, lead, rhenium, gallium, indium and thallium, metal M is introduced in an aqueous solvent in the form of at least one organometalic compound comprising at least one carbon-M bond.

Abstract: The invention concerns a process for the selective hydrogenation of polyunsaturated cyclic compounds comprising at least one endocyclic carbon-carbon double bond and at least one terminal exocyclic carbon-carbon double bond, said double bonds not being conjugated, to form a mixture essentially containing the saturated ring compound and comprising at least one terminal exocyclic double bond, the process being carried out in the presence of hydrogen under a pressure of from 1 to 10 MPa and at a temperature of from 0.degree. to 200.degree. C., and in the presence of a catalyst including a support and (a) from 0.1 to 5% by weight of at least one metal from group VIII (iridium, osmium, nickel, palladium, platinum and rhodium) and (b) from 0.01 to 15% by weight of at least one metal from group IVa (tin, germanium and lead), the molar ratio between metals of group VIII and group IVa being between 0.3 and 3. The process is used for the hydrogenation of 4-vinylcylcohexene to vinylcyclohexane.

Abstract: The invention concerns the production of a substituted or unsubstituted aniline by selective hydrogenation of the corresponding nitroaromatic compound. It is characterized by the use of a catalyst based on a metal selected from rhodium and ruthenium and based on a metal selected from the group comprising tin, germanium and lead.

Abstract: The invention concerns the production of a diolefinic unsaturated alcohol such as geraniol or nerol by the selective hydrogenation of citral. It is characterized by the use of a catalyst based on a metal from group VIII and based on a metal selected from the group made up of tin, germanium and lead, on preferably a silica carrier.

Abstract: The invention has as an object the production of alcohols by hydrogenolysis of carboxylic acid esters, under hydrogen pressure, in the presence of a catalyst resulting from the incorporation of at least one compound of at least one metal from the group consisting of germanium, tin and lead to Raney nickel or to a nickel-containing carrier. The reaction is preferably conducted at a temperature from 180.degree. to 330.degree. C. and under a pressure from 1 to 10 MPa.