Abstract: A method produces thin films. The method includes preparing a solution containing transition metal oxide precursors, a chelating agent, and a polar organic solvent. The solution is agitated in order to form a sol. The sol is used in the form of the transition metal oxide film. The chelating agent is selected from among di- or tri-aliphatic carboxylic acids, or salts or mixtures thereof. The polar organic solvent has a boiling temperature at atmospheric pressure of less than 150° C.

Abstract: A method produces thin films. The method includes preparing a solution containing transition metal oxide precursors, a chelating agent, and a polar organic solvent. The solution is agitated to form a sol. The sol is used in the form of the transition metal oxide film. The chelating agent is selected from among di- or tri-aliphatic carboxylic acids, or salts or mixtures thereof. The polar organic solvent has a boiling temperature at atmospheric pressure of less than 150° C.

Abstract: A process for manufacturing a composite material comprising a functionalization of the substrate, which comprises treatment of said substrate with at least one first alcoholic solvent, functionalization of a first powder and formation of a first colloidal sol of said functionalized first powder in a second solvent, at least one application of a layer of said first colloidal sol of said first powder to the substrate, drying of said layer of said first colloidal sol and formation of a layer of first coating formed by said first colloidal sol, adherent to said substrate, by heating at a temperature above 50° C. and below 500° C.

Abstract: The invention relates to a solid mineral composition of heavy metals, in particular mercury, in flue gas, to a method for preparing such a solid mineral compound and to the use thereof for reducing heavy metals, in particular mercury, in flue gas, by placing the flue gas in contact with the solid mineral composition.

Abstract: Method for the manufacture of carbon nanotubes by thermal decomposition of at least one gaseous hydrocarbon (14) in the presence of a solid catalyst in a reactor (4) into which the catalyst is introduced via an inlet lock chamber (17) flushed by an inert gas (21, 22, 25, 26) and from which the carbon nanotubes are withdrawn via an outlet lock chamber (37) which is flushed with a flow of inert gas (39, 40).

Abstract: Method for the manufacture of carbon nanotubes by thermal decomposition of at least one gaseous hydrocarbon (14) in the presence of a solid catalyst in a reactor (4) into which the catalyst is introduced via an inlet lock chamber (17) flushed by an inert gas (21, 22, 25, 26) and from which the carbon nanotubes are withdrawn via an outlet lock chamber (37) which is flushed with a flow of inert gas (39, 40).

Abstract: Method for the manufacture of carbon nanotubes by thermal decomposition of at least one gaseous hydrocarbon (14) in the presence of a solid catalyst in a reactor (4) into which the catalyst is introduced via an inlet lock chamber (17) flushed by an inert gas (21, 22, 25, 26) and from which the carbon nanotubes are withdrawn via an outlet lock chamber (37) which is flushed with a flow of inert gas (39, 40).

Abstract: The invention relates to a solid mineral composition of heavy metals, in particular mercury, in flue gas, to a method for preparing such a solid mineral compound and to the use thereof for reducing heavy metals, in particular mercury, in flue gas, by placing the flue gas in contact with the solid mineral composition.

Abstract: The invention relates to a solid inorganic composition for reducing dioxins and furans, as well as heavy metals, in particular mercury, present in flue gases, to a method for preparing such a composition, and to the use thereof for reducing dioxins and furans as well as heavy metals, in particular mercury, present in flue gases, by contacting said flue gases with said solid inorganic composition.

Abstract: Method for the manufacture of carbon nanotubes by thermal decomposition of at least one gaseous hydrocarbon (14) in the presence of a solid catalyst in a reactor (4) into which the catalyst is introduced via an inlet lock chamber (17) flushed by an inert gas (21, 22, 25, 26) and from which the carbon nanotubes are withdrawn via an outlet lock chamber (37) which is flushed with a flow of inert gas (39, 40).

Abstract: The invention concerns a method for preparing an organic gel metal-doped or not comprising a mixture in a solvent of an hydroxylated benzene with an aldehyde to form a gel whereof the texture is regulated by adjusting the pH of the starting mixture. The invention also concerns a method for preparing a carbonaceous material, metal-doped or not and obtained by drying followed by pyrolysis of the corresponding organic gel, whereof the porous texture is regulated according to the pH of the starting mixture. The resulting carbonaceous materials can be used in chemical catalysis or for making fuel cell electrodes.

Abstract: A process for preparing a supported catalyst comprising a transition metal selected from palladium, platinum, nickel, cobalt or copper on an aerogel support, which includes the steps of providing a mixture containing an alkoxide precursor of the aerogel, a chelate complex of the transition metal with a chelating agent having Si(OR)3 anchor groups, and an organic solvent in which the chelate complex is soluble; hydrolyzing the mixture by admixing it with water to form a gel; and converting the gel under supercritical conditions into the transition metal aerogel-supported catalyst. The supported catalyst has an especially homogeneous distribution of the metal component and is suitable, for example, for use as a hydrogenation catalyst.

Abstract: Process for the preparation of a catalyst including a metal of group VIII and a metal of group Ib, according to which the mixture including the alkoxide precursor of an inorganic oxide and complexes including the metals of group VIII and Ib and difunctional complexing compounds including an electron-donor group and a hydrolysable group is hydrolysed in order to form a gel. Process for the conversion of chloroalkanes into alkenes containing less chlorine by means of hydrogen, using such a catalyst.

Abstract: A process for preparing a supported catalyst comprising a transition metal selected from palladium, platinum, nickel, cobalt or copper on an aerogel support, which includes the steps of providing a mixture containing an alkoxide precursor of the aerogel, a chelate complex of the transition metal with a chelating agent having Si(OR).sub.3 anchor groups, and an organic solvent in which the chelate complex is soluble; hydrolyzing the mixture by admixing it with water to form a gel; and converting the gel under supercritical conditions into the transition metal aerogel-supported catalyst. The supported catalyst has an especially homogeneous distribution of the metal component and is suitable, for example, for use as a hydrogenation catalyst.

Abstract: Process for the manufacture of an aqueous solution of hydrogen peroxide by direct synthesis from hydrogen and oxygen in a three-phase system, according to which hydrogen and oxygen are reacted directly in the gaseous state at the surface of a solid heterogeneous catalyst, the reaction being performed continuously in a reactor with a stationary trickle bed, filled with solid catalyst particles forming the stationary bed through which a liquid consisting of an aqueous solution and the gas phase containing the hydrogen and oxygen are made to trickle concurrently.