53results about How to "Stable mesoporous structure" patented technology

The invention relates to the field of catalysts, and discloses a spherical composite carrier with a macroporous two-dimensional through a pore channel and a composite material containing a polyethylene catalyst, and preparation methods and application thereof. The carrier provided by the invention has an average particle diameter of 10 to 80 [mu]m, a specific surface area of 200 to 600 m2/g, a pore volume of 0.1 to 2.5 mL/g, and pore size distribution in bimodal distribution, wherein two peaks respectively corresponds to a first most probable pore size of 1.2 to 4.5 nm and a second most probable pore size of 32 to 60 nm. The carrier provided by the invention has stable mesoporous structure, still can maintain an ordered mesoporous structure after loading active components, and has high activity when loading the polyethylene catalyst to catalyze ethylene for polymerization reaction.

The invention relates to a preparation method of a low-temperature high-efficiency denitrification catalyst MnO2, which comprises the following steps: dissolving P123 in a deionized water-hydrochloric acid mixed solution, sequentially adding butanol and ethyl orthosilicate, and stirring; pouring into a closed polypropylene reaction kettle to react, collecting the solid, and drying; cleaning with an ethanol-hydrochloric acid mixed solution, and calcining to obtain a KIT-6 template; dropwisely adding into a manganous nitrate-ethanol mixed solution, stirring, separating the precipitate, cleaning with a sodium hydroxide solution and deionized water to a neutral state, and drying; and calcining in a muffle furnace to obtain the target substance. Compared with the traditional MnO2 catalyst, the mesoporous-structure MnO2 catalyst has the advantages of large specific area, more adsorbed oxygen and high removal ratio of oxynitrides; the MnO2 catalyst has high stability, and the mesoporous structure is still stable after denitrification treatment; and the MnO2 catalyst has higher selective catalytic reduction activity at low temperature, and thus, has favorable application prospects.

The invention provides a preparation method of silica gel column supported meso-porous biochar solid sulfonic acid (SiO2-BC-SO3H) from wood fiber biomass, and a method using the silica gel column supported meso-porous biochar solid sulfonic acid to catalyze sucrose hydrolysis for preparing glucose. The preparation method of the SiO2-BC-SO3H comprises the following steps: biomass heat carbonization or concentrated sulfuric acid dehydration carbonization, boiling water swelling, acidic silica sol intercalation, heating (350 DEG C) dehydration in nitrogen, and concentrated sulfuric acid sulfonation. The silica gel content of the SiO2-BC-SO3H prepared through the steps is about 15 wt%, the sulfonic group density is 0.9 mmol/g or above, and the SiO2-BC-SO3H has an interlayer meso-porous structure. The SiO2-BC-SO3H has better catalysis activity and better reusability than non-porous biochar solid sulfonic acid in the catalysis of the sucrose hydrolysis reaction.

The present invention relates to the field of polymerization reactions, and discloses an ethylene polymerization method and polyethylene obtained through the ethylene polymerization method. The ethylene polymerization method comprises: carrying out a polymerization reaction on ethylene in the presence of a catalyst under a polymerization reaction condition, wherein the catalyst contains a spherical porous mesoporous composite material and a magnesium salt and/or a titanium salt supported on the spherical porous mesoporous composite material, and the spherical porous mesoporous composite material contains a mesoporous molecular sieve material with a one-dimensional through-hole structure, and a mesoporous molecular sieve material with a hexagonal pore channel structure. According to the present invention, the supported catalyst with the stable mesoporous structure is used, such that the polyethylene product with characteristics of low bulk density, low melt index and breaking resistancecan be obtained.

The invention relates to the field of catalyst, and discloses a super-macroporous three-dimensional cubic channel spherical composite carrier and a supported polyethylene catalyst, and preparation methods and applications thereof. The carrier has an average particle diameter of 20-60mum, specific surface area of 200-600m<2>/g, and pore volume of 0.1-2mL/g. Pore size distribution is bimodal distribution, wherein the two modals are respectively corresponding to first most probable pore sizes of 3-10nm and second most probable pore sizes of 30-39nm. The super-macroporous three-dimensional cubic channel spherical composite carrier has a stable mesoporous structure, and can maintain ordered mesoporous structure after loading the active component. The carrier has high activity while loading the polyethylene catalyst for catalyzing an ethylene polymerization reaction. The supported polyethylene catalyst has high loading rate.

The invention discloses a magnetic palladium-carrying nitrogen-doped mesoporous carbon catalyst, a preparation method and an application thereof. A carrier of the magnetic palladium-carrying nitrogen-doped catalyst is nitrogen-doped mesoporous carbon, wherein palladium nano particles and iron nano particles are carried by surface of and pores in the nitrogen-doped mesoporous carbon. The preparation method includes the steps of: dissolving palladium salt to obtain a palladium salt solution, adding the magnetic nitrogen-doped mesoporous carbon to the palladium salt to obtain a mixture liquid; adding a formic acid solution to the mixture liquid, and performing a heating reaction to prepare the catalyst. The catalyst has stable structure and high catalytic performance, can prevent aggregation of the palladium nano particles and iron nano particles, and can be applied for removing Cr(VI) ions in water.

The invention relates to a copper-based antibacterial masterbatch and a preparation method thereof. The preparation method comprises the steps of mixing a soluble cuprous salt with water, adding mesoporous zirconium silicate to perform immersion adsorption to obtain a mixture; mixing and adding thiosulfate, metaphosphate and water into the obtained mixture, performing drying after the reaction, and obtaining cuprous ion-loaded zirconium silicate powder; mixing a carrier resin, a dispersing agent, a processing aid and the cuprous ion-loaded zirconium silicate powder and then performing extrusion pelleting, and obtaining the copper-based antibacterial masterbatch. A fiber obtained according to a conventional spinning process by the copper-based antibacterial masterbatch obtained through themethod has excellent antibacterial property and not only has good oxidation resistance, but also has excellent washing resistance, the preparation method is simple and convenient to operate, efficient, low in cost and lasting in effect and has a broad application prospect.

The invention relates to the field of mesoporous materials, and discloses a spherical mesoporous composite material and a supported catalyst and a preparation method thereof. The spherical mesoporouscomposite material comprises a mesoporous molecular sieve material with a one-dimensional hollow spherical pore structure, and the spherical mesoporous composite material has an average particle sizeof 21 to 29 microns, a specific surface area of 100-650 m<2>/g, and a pore volume of 0.5-1.8 ml/g, and the pore diameter is in trimodal distribution. The spherical mesoporous composite material provided by the invention has the advantages of stable mesoporous structure and uniform particle size distribution, the spherical mesoporous composite material as a catalyst carrier is high in strength andnot easily broken, and the supported polyethylene catalyst prepared from the spherical mesoporous composite material has high catalytic activity when catalyzing ethylene polymerization. A polyethyleneproduct which has a low bulk density and a low melt index and is not easily broken can be obtained.

The invention relates to an ethanol sensor based on a horseshoe-shaped SO2 sensitive material having annular meso-pores, and a production method of the sensor, and belongs to the technical field of semiconductor oxide gas sensors. The horseshoe-shaped SO2 sensitive material having annular meso-pores, prepared through using a soft template technology, is used in the invention. The large specific surface area and the ordered pore structure of the meso-porous material are used to effectively improve the sensitive property of the sensor to C2H5OH. The sensor structure is composed of an Al2O3 insulating ceramic tube with two annular gold electrodes, a semiconductor sensitive material coated on the annular gold electrodes and the Al2O3 insulating ceramic tube, and a nickel-chromium alloy heating coil traversing through the Al2O3 insulating ceramic tube. The sensor disclosed in the invention has the advantages of simple process, small size, and suitableness for large-batch production, so the sensor has wide application prospect in the detection of the content of C2H5OH in environment.

The invention relates to an aluminum ion-doped mesoporous titanium dioxide lithium battery anode material and a preparation method thereof, and belongs to the field of electrode material preparation techniques and energy. The preparation method comprises the following steps that (1), a titanium source, aluminum salt, hydrochloric acid and absolute ethyl alcohol are mixed according to a certain mole ratio, and a first reaction solution is obtained; (2), a certain amount of surface active agent dissolves in absolute ethyl alcohol, and a second reaction solution is obtained; (3), the first reaction solution and the second reaction solution are mixed and stirred, heated and subjected to aging, and xerogel is obtained; and (4),) xerogel is placed in a muffle furnace to be subjected to heat treatment, and aluminum ion-doped mesoporous titanium dioxide is obtained. The prepared titanium dioxide material has the advantages of being good in stability, large in specific surface area, high in conductivity and excellent in electrochemical performance, can serve as the anode of lithium-ion batteries, and is suitable for industrialized production.

The invention relates to a macroporous two-dimensional dual-channel spherical composite carrier and a composite material containing a polyethylene catalyst, and preparation methods and application thereof, belonging to the field of catalysts. The composite carrier contains silica and has a pore volume of 0.5 to 1.5 mL/g, a specific surface area of 200 to 650 m<2>/g and an average particle size of 30 to 60 [mu]m; pore diameter distribution is in the form of bimodal distribution; and double peaks respectively correspond to a first most probable pore size of 7 to 14 nm and a second most probable pore size of 30 to 39 nm. The spherical composite carrier provided by the invention has a stable mesoporous structure, can maintain an ordered mesoporous structure after loading of active components and presents high activity in catalysis of polymerization of ethylene after loading of the polyethylene catalyst.

The invention relates to the field of material preparation, and discloses an acidic donut-shaped macroporous/mesoporous material, a preparation method thereof, and application of the acidic donut-shaped macroporous/mesoporous material in preparation of 2, 6-bis(imino)pyridine. The average particle size of the acidic donut-shaped macroporous/mesoporous material is 3-20 [mu]m, the specific surface area is 200-800 m<2>/g, the pore volume is 1-2 ml/g, and the most probable pore size is 7-10 nm; and acetic acid is attached to the outer surface and/or the inner hole wall of the acidic donut-shaped macroporous/mesoporous material. When the catalyst is applied to an organic reaction, the activity of the catalyst in the organic reaction is far higher than that of industrial p-toluenesulfonic acid, formic acid or acetic acid after catalysis, and the catalyst can be repeatedly used and is more beneficial to environmental protection.

The invention relates to the field of ethylene polymerization, and particularly relates to an ethylene polymerization method and polyethylene produced through the method. The ethylene polymerization method includes the step of performing a polymerization reaction to ethylene under polymerization reaction conditions in the presence of a catalyst. The catalyst contains a spherical composite material and magnesium salt and/or titanium salt supported on the spherical composite material; the spherical composite material contains a mesoporous molecular sieve material having a three-dimensional cube-cage structure and silica gel. The invention also discloses polyethylene which is produced through the method. Through the method, a polyethylene product is low in bulk density and melt index and is not liable to break.