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

The present invention relates to the field of polymerization reaction, and discloses an ethylene polymerization method. Under the conditions of polymerization reaction, ethylene is subjected to a polymerization reaction in the presence of a catalyst, wherein the catalyst contains a spherical mesoporous composite material and a magnesium salt and / or titanium salt loaded on the spherical mesoporouscomposite material, and the spherical mesoporous composite material comprises a mesoporous molecular sieve material having a one-dimensional hollow spherical pore structure. The method uses a mesoporous structure-stabilized supported catalyst to obtain a polyethylene product which has a low bulk density and melt index and is not easily broken.

The invention relates to the field of mesoporous materials, and discloses a spherical small-size mesoporous composite material, a supported catalyst, and preparation methods of the spherical small-size mesoporous composite material and the supported catalyst. The spherical small-size mesoporous composite material contains a mesoporous molecular sieve material having a three-dimensional cubic cage-like pore channel structure, and has the average particle size of 15-30 [mu]m, the specific surface area of 200-650 m<2> / g, and the pore volume of 0.5-1.5 ml / g, wherein the pore sizes are distributedin a bimodal manner. According to the present invention, the spherical small-size mesoporous composite material has characteristics of stable mesoporous structure and uniform particle size distribution, and can provide the advantages of high strength and breaking resistance in the application as the catalyst carrier; and with the application of the supported polyethylene catalyst prepared from thespherical small-size mesoporous composite material in the catalysis of ethylene polymerization reactions, the high catalytic activity can be provided, and the polyethylene products with characteristics of low bulk density, low melt index and breaking resistance can be obtained.

The invention discloses a spherical mesoporous composite material, and a supported catalyst and a preparation method thereof, belonging to the field of mesoporous materials. The spherical mesoporous composite material has an average particle size of 20-30 micrometers, a specific surface area of 100-300 square meters / gram and a pore volume of 0.5-1.8 ml / gram; and the pore diameters of the spherical mesoporous composite material are in the form of bimodal distribution, and the most probable pore diameters corresponding to double peaks are 1-10 nm and 20-55 nm, respectively. The spherical mesoporous composite material provided by the invention has a stable mesoporous structure and uniform particle size distribution, and is high in strength and not prone to breakage as a catalyst; and the supported polyethylene catalyst prepared from the same has high catalytic activity when used for catalysis of ethylene polymerization, and polyethylene products which have low bulk density and a low melt index and are not prone to breakage are broken can be obtained.

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 double-mesoporous composite material and magnesium and / or titanium supported on the spherical double-mesoporous composite material; the spherical double-mesoporous composite material contains a mesoporous molecular sieve material having a hollow spherical structure, 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. The supported catalyst, when being applied to the ethylene polymerization reaction, is high in catalytic activity and can be used for producing high-performance polyethylene products.

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 the field of polymerization reactions and discloses an ethylene polymerization method and polyethylene produced therefrom. The ethylene polymerization method includes the steps of: in the presence of a catalyst, polymerizing ethylene under polymerization reaction conditions, wherein a catalyst contains a spherical zeolite mesoporous composite material and magnesium salt and / or titanium salt supported thereon. The spherical zeolite mesoporous composite material contains zeolite and a mesoporous molecular sieve material having a three-dimensional cube-cage pore structure. The invention also discloses polyethylene produced through the method. By means of the ethylene polymerization method, a polyethylene product being low in bulk density and melt index and being not liable to break can be produced.

The invention relates to a spherical zeolite mesoporous composite material, a preparation method of the spherical zeolite mesoporous composite material, the spherical zeolite mesoporous composite material prepared from the method, a supported metallocene catalyst containing the spherical zeolite mesoporous composite material, a preparation method of the supported metallocene catalyst, a supported metallocene catalyst prepared from the method, an application of the supported metallocene catalyst to alkene polymerization, and a method for polymerizing alkene. The spherical zeolite mesoporous composite material contains zeolite and a mesoporous molecular sieve material with a three-dimensional channel structure. The supported metallocene catalyst taking the provided spherical zeolite mesoporous composite material as a supporter has high catalytic activity in an alkene polymerization reaction.

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 invention relates to the field of catalysts, and discloses a polyolefin catalyst, a polyolefin, and a preparation method of the polyolefin catalyst and the polyolefin. The method for preparing thepolyolefin catalyst comprises the following steps: (1) enabling a silicon source to contact an ammonia water solution in the presence of a template agent to obtain a mesoporous material; (2) mixing the mesoporous material with silica gel and attapulgite, then sequentially carrying out filtration washing, ball milling, pulping and spray drying on the mixed materials, so as to obtain a spherical double-mesoporous attapulgite composite carrier; and (3) in the presence of inert gas, impregnating the spherical double-mesoporous attapulgite composite carrier in a catalyst mother liquor containing amagnesium salt and / or a titanium salt, and then sequentially carrying out filtration and drying, wherein the filtering washing in the step (2) are carried out in a ceramic membrane filter, and the content of sodium ions in the mixed material after the filtering washing is not higher than 0.2 wt% in terms of sodium element, and the content of the template agent is not higher than 1 wt%. The methodis efficient, simple, energy efficient and environmentally friendly.

The invention relates to the field of catalysts, and discloses a spherical double mesoporous attapulgite composite carrier, a preparation method and application thereof. The preparation method for thespherical double mesoporous attapulgite composite carrier comprises the following steps: (1) in the presence of an template, a silicon source is allowed to be in contact with an ammonia aqueous solution to obtain a mesoporous material; (2) water glass is allowed to be in contact with an inorganic acid solution to obtain silica gel; and (3) the mesoporous material, the silica gel and attapulgite are mixed, and then the mixed material is filtered and washed, the washed material is subjected to ball milling, the ball-milled material is pulped, and the pulped material is spray-dried, wherein filtering and washing in the step 3 are conducted in a ceramic membrane filter, the content of sodium ions in the filtered and washed material is not higher than 0.2 wt.% in terms of sodium element, and the content of the template is not higher than 1 wt.%. The ceramic membrane filter used in the method adopts cross-flow filtration, which has high separation efficiency and simplicity, and the spherical double mesoporous attapulgite composite carrier does not need to be calcined again later to remove the template, thus saving energy and protecting environment.

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.