The present invention relates to a method for producing a support at least micrometric in size, photocatalytically active and at least in the visible range, containing nanocrystals each composed of from 80 to 100 mol % of TiO.sub.2 and from 0 to 20 mol % of at least one other metal or semi-metallic oxide, comprising the following steps, from an acidic aqueous reaction medium, at a heating temperature of between 20 and 60° C.: a step of adding the titanium oxide precursor, or a mixture of the titanium oxide precursor and the precursor of the other oxide, in the acidic aqueous reaction medium, and a condensation step on or inside the support, by spraying onto the support or immersing the support in the aqueous reaction medium, for a specific period of condensation, a heating step, the support allowing the nanocrystals to be crystallized, without using surfactant, in the aqueous reaction medium, a step of rinsing with water and a recovery step on the one hand of the support on which the crystallization took place, these nanocrystals being attached by covalent bonds to the support, and on the other hand of a residual solution.

A nanocomposite has a core-shell structure with an outer shell and an inner core. The, outer shell is a graphitized carbon film, and the inner core contains nickel oxide and alumina, with a nickel oxide content of 59%-80%, an alumina content of 19%-40%, and a carbon content of not more than 1%, based on the total weight of the nanocomposite. The process for catalytic combustion of volatile organic compounds may utilize the nanocomposite as a catalyst.

A ceramic membrane for oxidative coupling of methane can include a perovskite oxide and catalyst material on a surface of the membrane.

Provided is a method for generating hydrogen at a desired rate, using a hydrogen storage material that can be stored and transported safely and inexpensively. The method according to the present invention for producing a silanol compound and hydrogen includes subjecting a hydrosilane compound and water to a reaction with each other in the presence of a solid catalyst to give a silanol compound and hydrogen. The solid catalyst includes hydroxyapatite and gold particles supported on the hydroxyapatite, where the gold particles have an average particle size of 2.5 nm or less. The reaction in the method according to the present invention for producing a silanol compound and hydrogen is preferably performed in an air atmosphere. The reaction in the method according to the present invention for producing a silanol compound and hydrogen can be performed with application of substantially no heat and no activated energy rays.

1,1,1,2-tetrafluoropropene (HFO-1234yf) in automobile air conditioning methods are disclosed.

The present invention relates to a catalyst for a hydrogenation reaction and a method for producing the same, and more specifically, to a catalyst for a hydrogenation reaction, wherein the catalyst includes nickel oxide as an active ingredient and copper oxide and sulfur oxide as a promoter, and especially, can control a reduction degree value according to whether or not a passivation layer of a nickel metal is removed.

According to the present invention, when preparing a hydrogenation catalyst including nickel as an active ingredient, the reduction of nickel can be facilitated by using copper and sulfur as a promoter. In particular, the present invention can provide a catalyst which, while having a high nickel content, includes sulfur oxide and nickel oxide in a particular range, and thus exhibits even higher selective reduction degree for olefins while having high activity of the catalyst.

The present invention addresses to catalysts applicable to the conversion of CO to CO.sub.2 and H.sub.2 by the water-gas shift reaction. Such catalysts are made up of iron oxides, zirconium oxides, cerium oxides or a mixture of the same, promoted by platinum (Pt) contents between 0.1 and 0.4% m/m and with a sodium (Na) content below 0.01% m/m, based on the oxidized material. The present invention makes it possible to obtain catalysts with a high dispersion of Pt, with metallic particles of the order of 1 nm and methods of preparation by coprecipitation of soluble salts in aqueous medium using ammonium hydroxide as a precipitating agent.

The present disclosure relates to the technical field of catalysts, and specifically to a Zn—Al slurry catalyst, its preparation method and its application in preparing ethanol from syngas. The preparation method provided in the disclosure prepares the Zn—Al slurry catalyst by introducing a zinc component into an aluminum sol, and the preparation method has a simple operation and a lower cost. The Zn—Al slurry catalyst prepared in the disclosure includes the Zn component and the Al component, which may catalyze syngas to generate ethanol under mild conditions. Also, the catalyst has stable properties, is not easy to be deactivated, and reduces the cost of preparing ethanol from syngas. When the Zn—Al slurry catalyst provided in the disclosure is used as the catalyst for preparing ethanol from syngas, the reaction conditions are mild, and the syngas may be catalyzed to generate ethanol under the conditions of 250-340° C. and 3-5 MPa.

The present invention relates to a mixed oxide of aluminium, of zirconium, of cerium, of lanthanum and optionally of at least one rare-earth metal other than cerium and lanthanum that makes it possible to prepare a catalyst that retains, after severe ageing, a good thermal stability and a good catalytic activity. The invention also relates to the process for preparing this mixed oxide and also to a process for treating exhaust gases from internal combustion engines using a catalyst prepared from this mixed oxide.