41 results about "Cerium(III) oxide" patented technology

Relating to a catalyst, the invention provides a preparation method of a catalyst for styrene preparation by ethylbenzene dehydrogenation. The catalyst has high crushing strength, large aperture and small specific surface area, and also has high catalytic activity in ethylbenzene dehydrogenation reaction under a low water ratio condition. The catalyst for styrene preparation by ethylbenzene dehydrogenation is a composite oxide of iron, potassium, magnesium, cerium and molybdenum. The method includes:1) preparation of nano-Ce2O3; and 2) preparation of the catalyst. According to a technical scheme, self-made nano-dicerium trioxide is adopted, and cerium nitrate and nano-dicerium trioxide in a proper ratio are introduced into the catalyst as the cerium source. The prepared catalyst has large aperture, small specific surface area and high crushing strength, and can maintain high catalytic activity under a low water-oil ratio condition.

The present invention provides a cerium oxide-zirconium oxide-based mixed oxide having superior platinum dispersibility and a suitable OSC, and a simple production process thereof. The cerium oxide-zirconium oxide-based mixed oxide comprises cerium oxide and zirconium oxide, wherein (1) the weight ratio of CeO 2 : ZrO 2 is 60:40 to 90:10, and (2) the cerium oxide and the zirconium oxide are present as a mixture, the zirconium oxide being composed of a solid solution in which tetragonal or cubic zirconium oxide contains cerium.

The invention provides a raw material for producing a disc insulator with good insulation performance and a preparation method, and relates to the technical field of electric power equipment. The production raw material and preparation method of the disk-shaped insulator with good insulation performance, the main raw material of the disk-shaped insulator includes the following raw materials in parts by mass: 15-25 parts of aluminum oxide, 10-15 parts of high potassium feldspar, clay 40-60 parts, 0.1-1 part of lanthanum oxide, 0.1-1 part of cerium oxide, 0.1-0.88 part of praseodymium oxide, 15-18 parts of pearl clay, 15-18 parts of garnet; the glazed surface of the main body of the disc-shaped insulator The raw materials include the following raw materials in parts by mass: 15-20 parts of quartz, 2-5 parts of talc, 18-27 parts of kaolin, 1-3 parts of copper oxide, 1-3 parts of ferric oxide, and 0.1-1 part of rare earth oxide . The processed insulator can have good mechanical strength, and at the same time, the processed insulator has good insulation performance and can ensure the long-term use of the insulator, which is worthy of vigorous promotion.

The invention provides a preparation method of a hexagonal-phase dicerium trioxide monocrystal film, which comprises the following steps: providing a reaction chamber which comprises a sample table; loading the cerium block into an evaporation source; the reaction chamber is vacuumized; heating the evaporation source; the method comprises the following steps: providing a tungsten single crystal substrate, and processing the tungsten single crystal substrate to obtain an atomic level flat surface; the processed tungsten single crystal substrate is placed on the sample table; continuously heating the evaporation source to obtain a cerium film; oxygen is filled into the reaction chamber, so that the cerium film is oxidized into hexagonal-phase dicerium trioxide; and carrying out annealing on the hexagonal-phase dicerium trioxide so as to obtain the hexagonal-phase dicerium trioxide single crystal thin film. The hexagonal-phase dicerium trioxide single crystal film prepared by the method is relatively high in purity.

The invention provides a catalyst for preparing p-nitroacetophenone by oxidizing 4-nitroethylbenzene and a preparation method of the catalyst. The method comprises the steps that clay and talc serve as the main raw materials, hydroxides of cerium (+3) and manganese (+2) are subjected to wet milling in a ball mill till the particle sizes are smaller than 320 meshes, an adhesive taking MC or PVA as the main component is added, a honeycomb greenware is produced through a technological process of extrusion molding, and the catalyst is obtained through firing at 1,240 DEG C to 1,280 DEG C. The catalyst comprises active catalytic components of cerium oxide, manganese dioxide and a ceramic carrier. The honeycomb ceramic catalyst of the Ce2O3-MnO2 and ceramic carrier has the advantages of being good in catalytic effect and long in service life. The catalyst is used for preparing p-nitroacetophenone by conducting pure oxygen catalyzing on 4-nitroethylbenzene, and the yield of p-nitroacetophenone is 65% or above.

The invention discloses an alloy co-infiltration dacromet and sealing layer comprehensive anti-corrosion coating, including alloy co-infiltration agent, dacromet coating liquid and sealing liquid: alloy co-infiltration agent includes zinc powder, aluminum powder, aluminum oxide powder, Nickel powder, cerium oxide powder, ammonium chloride; Dacromet anti-corrosion coating liquid includes A component and B component, A component includes zinc flake and aluminum flake, deionized water, fatty alcohol polyoxyethylene ether, B The components include amorphous compound molybdate compound, barium salt, hydrogen peroxide, polyethylene glycol; component A and component B are mixed according to the mass ratio of 1: (15-25); the blocking solution includes pre-preparation Pre-preparation components include, room temperature curing agent, ethanol solution with a volume concentration of 50% to 80%, a mixture of glycerol, zinc flakes and aluminum flakes; the curing reaction components are Epoxy resin aqueous emulsion, the pre-preparation component and the curing reaction component are mixed according to the mass ratio of 2: (2-3).