6 results about "Zirconium(IV) hydroxide" patented technology

The invention provides a preparation method and application of an amorphous zirconium-doped manganese oxide catalyst, and belongs to the field of organic catalytic synthesis. The catalyst is Zr-MnO2-x, and is rich in lattice oxygen with high activity and high stability; x is the molar ratio of Zr to the sum of Mn and Zr, and x is larger than or equal to 0.2 and smaller than or equal to 0.6; zirconium mainly exists in the form of zirconium hydroxide. The preparation method comprises the following steps: slowly dropwise adding a mixed salt solution of a zirconium source and a manganese source into a precipitant under a continuous stirring condition, and carrying out a co-precipitation reaction; after the reaction is completed, standing and aging, carrying out solid-liquid separation and collecting a precipitate; and washing and drying to obtain the amorphous zirconium-doped manganese oxide catalyst which is used for catalyzing aniline and derivatives thereof to synthesize azobenzene compounds. According to the invention, the characteristic of'difunctional lattice oxygen 'with high activity and high stability is introduced through zirconium doping, and the catalyst has the advantages of high activity, high selectivity, wide substrate applicability, excellent stability and reusability and the like when used for catalytic synthesis of azobenzene compounds.

A gas barrier film including a reaction product formed by a reaction of a zirconium oxide and a phosphoric acid compound, where the zirconium oxide is an amorphous zirconium oxide containing as a main component zirconyl hydroxide and / or zirconium hydroxide. A gas barrier laminate including the gas barrier film and a composition for forming a gas barrier layer.

The present invention addresses the problem of providing: a zirconium oxide powder obtained by reducing the particle diameter of secondary particles; and a method for producing the same. A zirconium oxide powder according to the present invention has: a crystal phase consisting solely of monoclinic crystals; and a unimodal particle size distribution. A method for producing the zirconium oxide powder according to the present invention comprises: a reaction step in which heated ammonium peroxodisulfate is added to heated zirconium oxychloride to obtain a basic zirconium sulfate slurry; a dehydration step in which the basic zirconium sulfate slurry is neutralized by adding ammonia water thereto to obtain a zirconium hydroxide slurry, and then a solvent is removed to obtain a zirconium hydroxide cake; a repulp washing step in which the zirconium hydroxide cake is subjected to repulp washing using ammonia water; a firing step in which the zirconium hydroxide cake is fired in a furnace using superheated steam to obtain zirconium oxide; and a crushing step in which the zirconium oxide is crushed to obtain a zirconium oxide powder.

The application belongs to the technical field of organic synthesis, and particularly relates to application of zirconium hydroxide as a catalyst in preparation of N-phenyl formamide or a derivative thereof from aniline or a derivative thereof. The application finds that N-phenyl formamide or a derivative thereof can be synthesized through catalytic oxidation reaction from aniline or a derivative thereof as raw material, zirconium hydroxide as a catalyst, and oxygen as an oxidant; the zirconium hydroxide catalyst can be directly purchased or prepared from a zirconium salt precursor by using a simple precipitation method, and is low in price; the application is simple in operation, low in production cost, high in yield, and easy to be industrialized.

This invention discloses a zirconia-supported noble metal catalyst, its preparation method, and its application, belonging to the technical field of preparation and application of supported noble metal catalysts. Using zirconium nitrate as a precursor, zirconium hydroxide is obtained via co-precipitation, followed by high-temperature calcination to prepare a zirconia support with a specific crystal phase composition. Palladium nanoparticles are then loaded onto the ZrO2 surface using an impregnation-reduction method to obtain a Pd / ZrO2 catalyst. In the prepared catalyst, palladium nanoparticles are uniformly dispersed on the support surface, with an average particle size of 1.7 nm, and the support contains abundant acidic sites. This invention features a simple preparation method, low noble metal usage, and high catalyst activity, exhibiting excellent catalytic performance in the hydrogenation and deoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran. Under low acid conditions of 150 °C, 1.5 MPa H2, and formic acid as the hydrogen donor, complete HMF conversion can be achieved, with a DMF selectivity of 83% and a conversion frequency of 224 h⁻¹. ‑1 Even after five cycles of use, it still maintains an 81% conversion rate and a 61% selectivity, showing good prospects for industrial application.

The application belongs to the technical field of organic synthesis, and particularly relates to selective oxidation of thioether to prepare sulfoxide and sulfone by using zirconium hydroxide as a catalyst. The application uses thioether as raw material, zirconium hydroxide as catalyst, and hydrogen peroxide as oxidant. Sulfoxide can be catalytically oxidized and synthesized in a short reaction time, and sulfone can be obtained by prolonging the reaction time. The selectivity can be regulated only by the reaction time without any additives. The zirconium hydroxide catalyst can be directly purchased or prepared by using a simple precipitation method with zirconium salt as a precursor, and is low in price. Hydrogen peroxide is used as an oxidant, and is green, stable, low in cost, high in atomic efficiency (47% active oxygen), and has water as the only by-product. In addition, the reaction process is simple in operation, low in cost, and high in yield, and has great industrial application prospect.