68results about How to "Ordered mesoporous structure" patented technology

The invention discloses a one-dimensional rod-like mesoporous material and a preparation method thereof and an application thereof, and belongs to the field of mesoporous materials. The preparation method comprises four steps including precursor preparation, filtration preparation of composite mesoporous membrane, elution of surfactant in membrane and dissolving of organic porous membrane, namely, mainly using filtration method to assemble inorganic mesoporous material in the holes of polycarbonate membrane to prepare composite membrane, then using extraction and elution to remove the surfactant in the composite membrane so as to obtain organic-inorganic composite mesoporous membrane, and soaking the organic-inorganic composite mesoporous membrane in dichloromethane solution, and obtaining the one-dimensional rod-like mesoporous material after completely dissolving the organic porous membrane. The rod-like material is a one-dimensional mesoporous silicon dioxide rod with a diameter of 200nm, a length of 10 mu m and a sequential hexagonal mesoporous structure belonging to MCM-41 type with an aperture of 3nm or belonging to SBA-41 type with an aperture of 8nm. The obtained one-dimensional rod-like mesoporous material is applied in the fields of biological macromolecule and catalyst adsorption and the like.

The invention discloses a ferronickel compound oxide catalyst and a preparation method and an application thereof and belongs to the technical field of atmospheric pollution control. The preparation method comprises the following steps: by taking nickel nitrate hexahydrate and iron nitrate nonahydrate as raw materials, urea as a precipitant, sodium citrate as a complexing agent, deionized water asa solvent and a detergent, carrying out solution preparation, hydro-thermal treatment, sample washing, drying and the like to prepare a NiFe-LDH precursor; and roasting NiFe-LDH to obtain a ferronickel compound oxide (NiFe-LDO) catalyst. By applying the catalyst to an ammonia gas selective catalytic reduction (NH3-SCR) denitration experiment, a result verifies that the prepared NiFe-LDO catalysthas catalytic activity over 85% at a window of 210-360 DEG C, N2 selectivity close to 95% and water resistance and sulfur resistance.

The invention discloses a synthesis method of a rare earth/Schiff base SBA-15 mesoporous composite luminescent material, which comprises the following steps: dissolving N,N'-bis salicylaldehyde ethylenediamine in anhydrous ethanol, adding a silane coupling agent triethoxysilylpropyl isocyanate, reacting in a N2 protective atmosphere for 12 hours, and separating and purifying the reaction solution with a rotary evaporator to obtain a hybrid material precursor; mixing a template agent P123, 2M HCl and deionized water, adding the obtained hybrid material precursor and ethyl orthosilicate after the P123 is completely dissolved, stirring to react at 35 DEG C for 24 hours, crystallizing at 100 DEG C for 48 hours, filtering, washing, removing the template agent P123, dissolving the obtained Schiff-base-functionalized SBA-15 mesoporous material in anhydrous ethanol, adding a rare earth nitrate ethanol solution, reacting at 80 DEG C for 12 hours, filtering the reaction solution, and drying to obtain the rare earth/Schiff base SBA-15 mesoporous composite luminescent material.

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 discloses a ZnO/In2O3 heterogeneous II type photocatalytic material with a hollow core-shell structure and a preparation method thereof. The preparation method comprises the following steps: step 1, dissolving zinc salt and indium salt into a mixed solution of water, ethylene glycol and polyethylene glycol; 2, adding urea and sodium citrate into the solution obtained in the step 1 while stirring to obtain a reaction system mixed solution; 3, transferring the reaction system mixed solution obtained in the step 2 to a high-pressure reaction kettle for hydrothermal reaction; and 4,cooling the hydrothermal reaction product obtained in the step 3 to the room temperature, performing centrifuging, washing, drying and calcining to obtain the ZnO/In2O3 heterogeneous II type photocatalytic material with the hollow core-shell structure. According to the method, the hollow shell-core structure and the heterogeneous II-type photocatalytic material are constructed at the same time through a simple one-step hydrothermal method, and the nanoparticles prepared through the method are small in particle size and can effectively inhibit in-vivo recombination of carriers, so that the photocatalytic efficiency is improved.

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 medium/low temperature mesoporous nitrogen oxide and dioxin removal catalyst and a preparation method thereof. According to the catalyst, a mesoporous carbon-silicon composite material is adopted as a carrier, and one or more of vanadium pentoxide, tungsten oxide, cerium oxide and manganese oxide are adopted as active components. The catalyst disclosed by the invention iscapable of effectively achieving synergetic removal of NOx and dioxin within a medium/low temperature range of 180-300 DEG C, and in addition, the catalyst disclosed by the invention has the advantages of being large in specific surface area, ordered in pore height, small in active metal particle size and uniform in active metal particle size distribution.

The present invention relates to the field of polymerization reactions, and discloses an ethylene polymerization method and polyethylene prepared through the method. According to the method, under a polymerization reaction condition, ethylene is subjected to a polymerization reaction in the presence of a catalyst, wherein the catalyst contains a spherical small-particle size mesoporous composite material and a magnesium salt and/or a titanium salt supported on the spherical small-particle size mesoporous composite material, and the spherical small-particle size mesoporous composite material contains a mesoporous molecular sieve material with a three-dimensional cubic cage-like pore channel structure. According to the present invention, the method uses the supported catalyst with the stablemesoporous structure, such that the polyethylene product with characteristics of low bulk density, low melt index and breaking resistance can be obtained.

The invention belongs to the technical field of inorganic porous materials and particularly relates to a nano-scale ordered mesoporous silicon dioxide sphere and a preparation method of same. The diameter of the ordered mesoporous silicon dioxide sphere is controllable within the range of 150-500 nm. The sphere is uniform in size and shape, is 1073-1615 m<2>/g in specific surface area, is 0.71-1.16 cm<3>/g in pore volume and is 3.06-3.81 nm in pore diameter, and has an ordered mesoporous structure in a manner of radicalized arrangement from sphere center to outer surface. The preparation method is simple in process, is easy to carry out, is low in cost, is mild in reaction conditions, is good in repeatability and high in yield, is short in production period, is easy to amplify and is environment-friendly.

The invention discloses a preparation method for a para-aminophenol ordered mesoporous carbon catalyst. The preparation method is characterized in that chitosan is taken as a raw material, and non-precious metal compounds are used as a doping source, meanwhile, a triblock copolymer surfactant is added, after performing self-produced high pressure treatment under a high temperature hydrothermal condition, filtering is performed so as to obtain a dark brown solid product, the solid product is dried, ground, and then put into a tubular calcinator, and high temperature carbonization under inert gas atmosphere protection is performed, so as to obtain a high-stable metal-doped carbon-based catalyst with different ordered mesoporous structures. The catalytic efficiency of the high-stable metal-doped carbon-based catalyst for para-nitrophenol hydrogenation catalysis generating para-aminophenol is investigated. The operation process has the main characteristics that the biomass resource chitosan is used as a raw material and is environmentally friendly, cheap and available; the surfactant is added, so that the formation of the ordered mesoporous structure is effectively controlled, the effective contact area between the reactant and the catalyst is increased, and the reaction conditions are mild; an active center and a carbon material are generated simultaneously, so that the structureis more stable, and the reaction process operationis simple.

The invention discloses a method for preparing a hierarchical porous material based on rapid solvent evaporation in an inverse microemulsion system. According to the method, resorcinol, phloroglucinoland terephthalaldehyde are adopted to replace common phenol and formaldehyde to synthesize phenolic resin such that the reaction time can be shortened; esters such as methyl methacrylate, triblock non-ionic surfactants such as polyether F127, F108 and P123 or ionic surfactants such as hexadecyl trimethyl ammonium bromide and the like are used for forming an inverse microemulsion as a reaction system, the hierarchical porous material can be obtained by directly evaporating a high-temperature solvent, the subsequent hydrothermal curing process is omitted, the reaction time can be greatly shortened, and the product obtained by using the inverse microemulsion system has an ordered mesoporous structure.

The present invention discloses a preparation method of rare earth complexes containing mesoporous material SBA-15 Schiff base ligands and an application thereof, belonging to the field of environmentally friendly purification; the rare earth complexes have a chemical composition of RE (S-SBA-15) 3, wherein RE represents one or more than one rare earth ion of La3 +, Ce3 +, Pr3 +, Nd3 +, Pm3 +, Sm3 +, Eu3 +, Gd3 +, Tb3 +, Dy3 +, Ho3 +, Y3 +, Er3 +, Tm3 + and Yb3 +; S-SBA-15 is Schiff base; and the structural formula is shown in the figure of the abstract. The preparation method of the rare earth complexes containing mesoporous material SBA-15 Schiff base ligands of the invention is simple, and low in cost; the rare earth complexes have strong bacteriostatic activity, have a minimum inhibitory concentration of less than 120 micrograms per milliliter for both escherichia coli and staphylococcus aureus, and have a broad-spectrum antibacterial property. The rare earth complexes have a large specific surface area and a highly ordered mesoporous structure, which can be used as an antibacterial agent in the field of environmental purification.

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 preparation of a solid acid catalyst by taking an SBA-15 mesoporous molecular sieve as a matrix and application of a related catalyst in a reaction process of preparing buteneby decarboxylation of [gamma]-valerolactone, and belongs to the technical field of catalysts. Al is introduced into an SBA-15 molecular sieve skeleton through adoption of an impregnation method or asolid-phase grinding method to form corresponding solid acid sites. The method comprises the following steps: adding [gamma]-valerolactone and 10wt% of a catalyst into a high-pressure kettle, and performing reacting for 4 hours under the conditions that the initial pressure is atmospheric pressure, the temperature is 320 DEG C and the speed is 700r/min, so that the yield of butene is as high as 97%. The catalyst disclosed by the invention has the advantages that the catalyst preparation process is simple, the cost is low, and mass production can be realized; the obtained catalyst has a large specific surface area; and the catalytic reaction conditions are mild, the butene yield is high, and the catalytic stability is good. Therefore, the catalyst provides more ideas and methods for effective development and utilization of biomass energy.

The invention discloses a three-dimensional hierarchical-pore gel based on fluorescent mesoporous silica nanorods. The gel has a three-dimensional hierarchical-pore structure established by covalently bridging the mesoporous silica nanorods through top ends, the mesoporous silica nanorods for establishing the gel have transverse-perpendicular pore channel structures, and fluorescent molecules are covalently grafted in mesoporous channels of the mesoporous silica through mono-dispersion. The invention also provides a preparation method of the three-dimensional hierarchical-pore gel based on the fluorescent mesoporous silica nanorods. The preparation method adopts one-step assembly, is simple and efficient and can be carried out in a large-scale mode. The prepared gel is established based on the mesoporous silica nanorods, thus has the three-dimensional hierarchical-pore structure and is conductive to simultaneous loading and combined treatment of cross-size drug molecules. The mesoporous silica nanorods have small diameters (25 nanometers) and vertical mesoporous channels and are conductive to diffusion of supported drug molecules, and the three-dimensional hierarchical-pore gel has the wide application prospect in the field of biological medicine.

The invention provides a TiO2 and CuO composite porous material for a supercapacitor and a preparation method thereof, belonging to the technical field of electrode materials. The composite porous material has an ordered porous structure, and as the electrode material of the supercapacitor, can effectively reduce the expansion and contraction generated in the charging and discharging process, andkeep the structure stable. The preparation method of the composite porous material comprises the following steps: placing a slide in an ethanol solution of polystyrene microspheres, evaporating ethanol to form a polystyrene film by self-assembly; P123 is stirred and dissolved in ethanol, isopropyl titanate and hydrochloric acid are added, titanium tetrachloride is added dropwise, and cupric chloride dihydrate is added to obtain composite precursor solution of titanium dioxide and cupric oxide; The glass slide loaded with polystyrene film was inserted into the composite precursor solution obliquely, and the ethanol was evaporated to induce the self-assembly of the composite precursor on the polystyrene film. TiO2 and CuO composite porous materials were obtained by calcination in muffle furnace.

The invention discloses a preparation method of a fuel cell non-metal catalyst of a nitrogen-phosphorus doped ordered mesoporous carbon material. According to the method, mesoporous SBA-15 is used asa hard template, and hexapolycyclotriphosphazene (HCCP) in the mesoporous SBA-15 is pyrolyzed to obtain the nitrogen-phosphorus doped ordered mesoporous carbon material. The preparation method has theadvantages that the template method is simple, nitrogen and phosphorus in the carbon skeleton are uniformly doped, pore passages are ordered, and the catalyst has long-term stability and higher tolerance to methanol; that is to say, the invention provides a thought for preparing the high-efficiency metal-free oxygen reduction catalyst by using common chemical raw materials, and has important reference significance. Meanwhile, the method is simple to operate and low in price, and shows good oxygen reduction catalytic performance, so that the method has a good application prospect in the fieldof fuel cells.

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.