93 results about "Amorphous silica" patented technology

The invention belongs to the technical field of environmental protection, and provides a preparation method of an imine-modified functionalized mesoporous magnetic silicon dioxide nano material. The method comprises the following steps: synthesizing Fe3O4 magnetic nanoparticles in a Fe < 2 + > / Fe < 3 + > alkaline hydrolysis system through a coprecipitation method; then coating the magnetic nanoparticles with an amorphous silicon dioxide layer by taking TEOS (tetraethoxysilane) as a silicon source by adopting a sol-gel method, so as to prepare magnetic silicon coated nanoparticles; the prepared nano-particles are subjected to secondary silicon coating guided by a cetyl trimethyl ammonium bromide (CTAB) mesoporous template agent, and mesoporous magnetic silicon nano-particles are formed after calcination; and finally, carrying out surface amination modification on the mesoporous magnetic silicon nano-particles by utilizing an amino silane coupling agent, and then carrying out condensation reaction on the mesoporous magnetic silicon nano-particles and various aldehyde derivatives to construct imine bonds, so as to obtain the imine-modified functionalized mesoporous magnetic silicon dioxide nano-material. The imine-modified functionalized mesoporous magnetic silicon dioxide nano-material formed by the invention has the characteristics of efficient adsorption, rapid magnetic recovery and excellent environmental stability, and can effectively remove polystyrene micro-plastics and organic pollutants in a water body.

The invention discloses an amorphous silicon-aluminum microsphere carrier material and a preparation method thereof, and the amorphous silicon-aluminum microsphere carrier material comprises 50-80 wt.% of silicon dioxide and 15-40 wt.% of aluminum oxide based on the dry basis weight of the amorphous silicon-aluminum microsphere carrier material. The amorphous silicon-aluminum microsphere carrier material provided by the invention has a relatively high specific surface area and abundant large-size mesoporous channels, and is beneficial to improving the loading capacity of active components, improving the mass transfer and diffusion efficiency and reducing the diffusion limitation. The amorphous silicon-aluminum microsphere carrier material with a large specific surface area and abundant large-size mesoporous channels is prepared by changing crystal nucleation and growth modes of a product in the synthesis process, and meanwhile, the contents of silicon oxide and aluminum oxide can be flexibly regulated and controlled, so that different requirements of catalytic reactions in different fields can be met.

The present invention provides a silica / hydrotalcite composite slow-release fertilizer and a preparation method thereof, comprising the following steps: uniformly mixing amorphous silica, a divalent metal salt, a trivalent metal salt, and water to obtain a mixed solution; subjecting the mixed solution to a hydrothermal reaction, followed by filtering, washing, and drying to obtain a silica / hydrotalcite nanocomposite material; calcining the silica / hydrotalcite nanocomposite material to obtain a silica / metal oxide nanocomposite material; and loading inorganic and organic fertilizers onto the silica / metal oxide nanocomposite material to obtain a silica / hydrotalcite composite slow-release fertilizer. This preparation method is simple, highly feasible, low-cost, and easily scalable for industrial production. The layered and pore-channel structure of the silica / hydrotalcite nanocomposite material effectively provides ample space for the loading of nutrients, thereby improving the slow-release efficiency of nutrients in the fertilizer, increasing nutrient utilization efficiency, reducing fertilization frequency, and minimizing potential environmental impacts.

The present invention provides a ZSM-23 molecular sieve and a preparation method thereof, wherein the mesoporous pore volume of the molecular sieve having a pore size of 3-8 nm accounts for 45-90% of the total pore volume of the molecular sieve; the relative crystallinity of the molecular sieve is 95-120%, and the relative crystallinity retention of the molecular sieve after 2 hours of hydrothermal treatment with 600 ° C of steam is 95-100%. The preparation method of the molecular sieve comprises the following steps: (1) preparing or selecting a silicon source, such as amorphous silica, for preparing the ZSM-23 molecular sieve; (2) alkali-treating the silicon source amorphous silica for preparing the ZSM-23 molecular sieve described in step (1); (3) preparing the ZSM-23 molecular sieve using the amorphous silica after alkali treatment as a silicon source. The ZSM-23 molecular sieve has a rich mesoporous structure and good hydrothermal stability.

The present invention relates to the technical field of quartz sand, and particularly relates to a method for preparing high-purity cristobalite, which method comprises: drying, calcining and scattering amorphous silica to obtain high-purity cristobalite. Compared with the prior art, the present invention has the following beneficial effects: 1, the amorphous silica has a relatively large specific surface area, with the surface thereof rich in hydroxyl, the cristobalite is apt to contain pores during the process of converting the amorphous silica into the cristobalite, and in order to eliminate the pores, the present invention uses a coupling agent for surface treatment and then conducts calcination, which results in, as shown in data, significant reduction in hydroxyl; and 2, under the condition of the same mass of the coupling agent, the inventor selects a silane coupling agent having a shorter chain, which results in fewer pores in the cristobalite and reduction in the calcining temperature and time to a certain extent, and possible reasons therefor are that the silane coupling agent is decomposed at a high temperature to form silicon oxide and the silicon oxide formed by decomposition has a smaller particle size and preferentially forms a crystal nucleus, thereby promoting the overall crystal form conversion.

The invention provides a diesel oil hydro-upgrading catalyst and a preparation method thereof. The catalyst prepared by the method is spherical and is composed of a molecular sieve, an active metal-amorphous silicon-aluminum compound and an active metal-aluminum oxide compound, the molecular sieve is a core, the active metal-amorphous silicon-aluminum compound is a middle layer, the active metal-aluminum oxide compound is a shell layer, and the thicknesses of the molecular sieve, the active metal-amorphous silicon-aluminum compound and the active metal-aluminum oxide compound can be flexibly adjusted. The catalyst has an open pore channel structure in stepped pore distribution, the pore diameter is gradually increased from inside to outside, the acidity is gradually reduced from inside to outside, the active metal content is gradually increased from inside to outside, the catalyst and the molecular sieve are distributed in a partitioned manner, and the change of the pore diameter, the acidity and the active metal content has the characteristics of coherence and small span. The catalyst is especially suitable for the hydrogenation modification process of straight-run diesel oil, the hydrogenation capacity and the ring opening capacity of the catalyst are highly matched, the yield of modified diesel oil is high, the BMCI is low, and the maximum production of high-quality ethylene cracking raw materials from straight-run diesel oil can be realized.

The present invention describes a method for preparing an amorphous silica-alumina-based material having incorporated therein, by means of precipitation, at least one acid solution and / or suspension of an aluminium source together with colloidal alumino-silicate particles having the structure of zeolite and conferring on the final material improved acidity relative to silica-alumina of the prior art, thereby providing a catalyst or a catalyst support that can be used in hydroconversion reactions.

An amorphous silica / cubic Co3O4 / cubic NiO / C nanocomposite material includes an amorphous Si phase, a cubic Co3O4 phase and a cubic NiO phase. Further, the amorphous silica / cubic Co3O4 / cubic NiO / C nanocomposite material has a granular morphology with an average grain size in a range from 0.5 to 2.5 μm, where the granular morphology includes nanoscale particles aggregated into the granular morphology. Still further, the nanoscale particles have an average particle diameter in a range from 30 to 90 nm. Furthermore, the amorphous silica / cubic Co3O4 / cubic NiO / C nanocomposite material has an adsorption capacity for ciprofloxacin of greater than or equal to 170 mg / g.

The present invention pertains to a grain-oriented electrical steel sheet having a base steel sheet, a glass cover film formed on the surface of the base steel sheet, and an insulating cover film formed on the surface of the glass cover film, the base steel sheet having a sheet thickness of 0.15-0.35 mm, the insulating coating film contains a phosphoric acid metal salt, amorphous silica, and an alkaline earth metal element other than magnesium, the amorphous silica is contained in an amount of 50-150 parts by mass per 100 parts by mass of the phosphoric acid metal salt, the total amount of the alkaline earth metal element is 1.0-20 parts by mass, and the moisture content of the insulating coating film is 0-0.04% by mass.

This disclosure relates to an amorphous silica-alumina catalyst with a high surface area and a high pore volume useful for hydrocracking. This disclosure also relates to a process of preparing an amorphous silica-alumina catalyst with an increased surface area and an increased pore volume.

The present invention belongs to the technical field of two-dimensional materials, specifically a kind of amorphous silicon dioxide two-dimensional material and its preparation method. The present invention uses pre-polymerized tetraethyl silicate, ethyl acetate and alkali source as raw materials, and prepares amorphous silicon dioxide two-dimensional material precursor by self-assembly reaction; utilizes easy high temperature, chemical etching and electrochemical corrosion sacrificial template method, and obtains amorphous silicon dioxide two-dimensional material by removing template; Compared with existing methods, this method has low cost, simple process, strong universality, and output improvement of 100-10000 times; product morphology is adjustable between 1μm-40μm, and thickness is adjustable between 1nm-10nm; the amorphous silicon dioxide two-dimensional material has excellent high temperature resistance (can withstand more than 1,000 degrees Celsius for a long time), good semiconductor properties and biocompatibility and other characteristics, and has broad application prospects in the fields of semiconductors and integrated circuits, biomedicine, aerospace and scientific research.

White particles according to the present invention comprise amorphous silica derived from a phyllosilicate mineral and an aqua iron oligomer. This production method for the white particles includes preparing an aqueous raw-material dispersion containing a phyllosilicate mineral and an iron compound, regulating the pH of the aqueous raw-material dispersion to a value of -1 or larger but less than 0.3, and aging the aqueous raw-material dispersion while stirring.

A method for manufacturing a ceramic coating is provided, the method comprising: preparing a ceramic coating; and forming the ceramic coating on a substrate using a layer-forming process, wherein the method for preparing the ceramic coating comprises: preparing a ceramic coating precursor; preparing slow-release particles; and mixing the ceramic coating precursor with the slow-release particles to obtain the ceramic coating. The slow-release particles comprise a slow-release material and silicone oil bound to the slow-release material. The slow-release material comprises at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate, and layered sulfate.

The present invention provides a polystyrene white oil and a preparation method thereof. The preparation method comprises the following steps: subjecting a heavy fraction of hydroisomerization oil to a white oil hydrogenation reaction in the presence of a white oil hydrogenation catalyst to obtain polystyrene white oil; wherein the white oil hydrogenation catalyst comprises an amorphous silica-alumina-based support and an active metal, wherein the active metal comprises platinum and palladium. The present invention utilizes a catalyst having high catalytic activity to compound the heavy fraction of hydroisomerization oil for hydrorefining to obtain a high-viscosity polystyrene white oil having excellent oxidative stability, photothermal stability, and all indicators meeting the standards for polystyrene white oil.

An adhesive comprises a thermoplastic elastomer block copolymer comprising a middle block and two or more polystyrene end blocks, a tackifying resin, and precipitated amorphous silica. The adhesive tape includes the adhesive disposed on a backing. Methods for making and using the adhesive tape are also provided.

The purpose of the present invention is to provide a novel fluorocarbon separation method. The method for separating fluorocarbon comprises a step of supplying a mixed gas containing two or more fluorocarbon gases having different molecular diameters to a porous membrane, and separating a gas composition or a single gas in which the mixing ratio of one fluorocarbon gas selected from the two or more fluorocarbon gases is increased, the porous film contains amorphous silica formed by a sol-gel method.

An oxygen scavenger including synthetic amorphous silica impregnated with a drying oil and an oil-soluble metal catalyst.

This invention discloses a non-toxic liquid chromatography teaching aid, comprising a medium-pressure liquid chromatography column with an aspect ratio of not less than 10, activated amorphous silica gel, a syringe, a pre-dispensed mixture of target compounds, and pre-dispensed food-grade citric acid. The pre-dispensed mixture of target compounds is a mixture of carmine, tartrazine, and brilliant blue. This invention does not use harmful solvents or reagents, and the separation time is significantly reduced to less than 3 minutes. Furthermore, the chromatographic column used as a teaching aid can be reused multiple times. The actual separation cost is only pure water and food coloring solution, greatly improving the feasibility of chromatography teaching experiments.

An amorphous silica powder comprising boron atoms. The amorphous silica powder comprising boron atoms has an average particle size from 10 to 100 nm, as determined from 40 particles selected at random in a transmission electron micrograph. The amorphous silica powder comprising boron atoms has a decrement in a boron content of 10 mass % or less, when fired under the following conditions: 5 to 10 g of a dried product of the boron-containing amorphous silica powder is filled into an alumina crucible, heated in the atmosphere at 200° C. / hour to 1000° C. to 1100° C., maintained as it is for 5 hours, and cooled to room temperature.

The present invention relates to a bifunctional catalyst comprising a carrier and an active component; the carrier is amorphous silica gel, and the active component is an all-silicon molecular sieve encapsulating a metal element; the metal element provides dehydrogenation active centers for the bifunctional catalyst, and the carrier and the all-silicon molecular sieve provide Lewis acid centers for the bifunctional catalyst. The present invention provides a bifunctional catalyst containing an all-silicon molecular sieve encapsulating copper and a preparation method thereof. The method comprises the following steps: mixing a silicon source I, a copper source, an additive, a dispersant, a nitrogen-containing heterocyclic compound, an alkali source, and H2O in a proportional manner, followed by hydrothermal treatment to obtain an all-silicon molecular sieve encapsulating copper oxide; and mixing a silicon source II, the prepared all-silicon molecular sieve encapsulating copper oxide, sesbania powder, a porogen, and H2O in a proportional manner, followed by molding to obtain the bifunctional catalyst containing the all-silicon molecular sieve encapsulating copper oxide. The present invention also provides a method for directly preparing ketones from olefins, using the above-mentioned bifunctional catalyst.

A process for preparing a silica-alumina gel-based catalyst produced in extruded form and usable in the field of hydrocarbon catalytic conversion processes, e.g., alkylation, isomerization and oligomerization, wherein the flammable alcohols resulting from the hydrolysis of metal precursors and gelling are removed by evaporation and replaced, in whole or in part in terms of weight, with demineralized water added to the mixture in an amount of 30 to 100 weight-% of the amount of formed alcohols, so as to maintain the gel with a rheology comparable to that of the original gel containing the alcohols, thus allowing the step of mixing the mixture obtained by gelling with a binder precursor (boehmite or pseudo-boehmite) and a subsequent extrusion of the paste to also be carried out in non-explosion-proof electrical equipment and systems.

The present invention aims to achieve a high level of balanced flame retardancy, heat resistance, and resilience in a cable. A method for solving the problem of the present invention relates to a cable comprising a conductor, an insulating layer covering the conductor, and a sheath covering the insulating layer, wherein the sheath is formed from a flame-retardant resin composition comprising a base polymer (A), a plasticizer (B), a stabilizer (C), and a flame retardant (D), wherein the base polymer (A) comprises chlorinated polyethylene (a1) and at least one polyurethane thermoplastic elastomer (a2) selected from the group consisting of an adipate ester, a lactone, and a carbonate ester, the stabilizer (C) comprises hydrotalcite (c1) and a metal soap (c2), and the flame retardant (D) comprises at least one of a metal hydroxide (d1), a brominated flame retardant (d2), amorphous silica (d3), and antimony trioxide (d4).

To provide a filler for electronic materials which is different from a conventional filler for electronic materials.SOLUTION: Thin plate-shaped amorphous silica has been found to have a preferred property for a filler for electronic materials. That is, it has been found that controlling an orientation direction of the amorphous silica in a resin composition, with the amorphous silica being formed into a thin plate shape, results in the resultant resin composition which exhibits anisotropy in thermal expansion coefficient. Thus, it has been found that an electronic material having a desirable property can be attained by orienting a thin plate-shaped material to a direction in which low thermal expansion coefficient is required. The filler for electronic materials of the present invention includes the thin plate-shaped material including amorphous silica which is a plate-shaped matter and has (long side particle diameter in an extending direction) / (thickness) of 5 to 50.SELECTED DRAWING: Figure 1

The present application relates to the technical field of composite ceramic coatings, specifically to an ultra-high-temperature resistant, anti-oxidation ceramic coating and its preparation method. The preparation method comprises the following steps: preparing a transition layer: mixing amorphous silica, crystalline silica, an adhesive, and a solvent in proportion to obtain a transition layer slurry; adhering the slurry to a substrate and pressurizing and curing to obtain A; preparing a sealing layer: mixing a mixture of SiO2 and B2O3, a phenolic resin, and alcohol in proportion to obtain a sealing layer slurry; adhering the slurry to A and curing to obtain B; preparing an oxygen barrier layer: mixing Si3N4 or SiC, or a mixture of the two, a phenolic resin, and alcohol in proportion to obtain an oxygen barrier layer slurry; adhering the slurry to B and curing to obtain C; preparing an anti-erosion layer: mixing a mixture of ZrSiO4 and SiC, a phenolic resin, and alcohol in proportion to obtain an anti-erosion layer slurry; adhering the slurry to C and curing to obtain D; and performing oxygen-free, high-temperature sintering. The present application relates to an anti-oxidation ceramic coating capable of withstanding temperatures of 2000°C.

This invention discloses a wax oil hydrocracking catalyst, its preparation, and its application. The catalyst mainly comprises the following components by weight: 1-30 parts of mesoporous-microporous SBA-15 / HY composite molecular sieve; 15-40 parts of amorphous silica-alumina; 5-30 parts of mesoporous alumina; 10-30 parts of oxides of metal W or Mo; 1-8 parts of oxides of metal Co or Ni; 1.0-5.0 parts of extrusion aid; and 3-8 parts of binder. The mesoporous-microporous SBA-15 / HY composite molecular sieve is prepared under ultrasonic emulsification. The wax oil hydrocracking catalyst provided by this invention can operate stably for long periods when processing inferior wax oil feedstock.

A ceramic coating and a non-stick utensil including the ceramic coating are provided. The ceramic coating comprises: a first ceramic coating layer comprising a ceramic coating precursor and slow-release particles dispersed in the ceramic coating precursor; and a second ceramic coating layer disposed on the first ceramic coating layer and comprising the second ceramic coating. The slow-release particles comprise a slow-release material and silicone oil bound to the slow-release material. The slow-release material comprises at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate, and layered sulfate.

The present invention provides a mineralized filter material, which includes a core layer and a cortex, wherein the core layer includes 0-10 parts by mass of a strontium salt, 30-100 parts by mass of a calcium salt, 4-40 parts by mass of amorphous silica and 3-30 parts by mass of sodium alginate, and the cortex includes polyvinyl alcohol, and the core layer and the cortex are concentric circle structures. Since the mineralized filter material provided by the present invention is selected from specific chemical components, material selection is safe and reliable. In addition, due to the selection of the skin-core structure, the mineral is released basically only at the end face exposed by the particle core layer, and within the entire service life, the area exposed by the core layer end face does not change substantially, thereby making the mineral release rate relatively stable. The mineralized filter material provided by the present invention can supplement beneficial ingredients such as calcium and metasilicic acid, and is suitable for functionalized water quality adjustment of pure water machines.

The present invention relates to a clearcoat system comprising a component A) comprising in turn at least one OH- functional polymer a1), at least two kinds of silica constituents, namely at least one kind of fumed silica as constituent a2), and at least one kind of amorphous silica matting agent as constituent a3), which is different from constituent a2), wherein the weight amount of constituent a3) exceeds the weight amount of constituent a2), and wherein the amount of constituent a3) in component A) is at least 2.5 wt.-%, based on the total weight of component A), and a component B) comprising in turn at least one organic constituent b1) bearing on average two or more isocyanate groups, wherein at least a part of these isocyanate groups has been reacted with at least one silane prior to incorporation of constituent b1) into component B), a clearcoat composition obtainable by mixing at least components A) and B), a method of coating a substrate making use of said clearcoat composition, a coated substrate obtainable by this method, and to a multilayer coating system comprising at least two coatings layers L1 and L3, wherein layer L3 is obtainable from the clearcoat composition.

The embodiment of the invention relates to the technical field of fuel cells, and provides a preparation method of a graphitized mesoporous carbon carrier, which is beneficial for the carbon carrier to have the characteristics of high graphitization degree and high mesoporous capacity. The preparation method comprises the following steps: providing an initial carbon carrier; carrying out pre-oxidation treatment, dispersing the initial carbon carrier in an oxidizing solution, and carrying out reflux treatment to obtain a pre-oxidized carbon carrier; carrying out functionalization treatment on the pre-oxidized carbon carrier, dispersing the pre-oxidized carbon carrier in a water-alcohol solution containing a weakly alkaline solvent, adjusting the pH value of the reaction solution to an alkaline condition, and carrying out a reaction to obtain a functionalized carbon carrier; the functionalized carbon carrier and a silicon source are subjected to a hydrolysis reaction, a target carbon carrier is obtained, and amorphous silicon dioxide is contained in pore channels of the target carbon carrier; carrying out graphitization treatment on the target carbon carrier to obtain an initial mesoporous carbon material; and carrying out alkali washing treatment on the initial mesoporous carbon material to obtain the target mesoporous carbon material.

The present application provides an amorphous silicon-aluminum-based carrier, a white oil hydrogenation catalyst and a preparation method and application thereof, the preparation method of the amorphous silicon-aluminum-based carrier comprises the following steps: S1: an amorphous silicon-aluminum material is prepared by using a silicon source and an aluminum source; S2: the amorphous silicon-aluminum material is modified by using boric acid and urea in sequence to obtain the amorphous silicon-aluminum-based carrier. The white oil hydrogenation catalyst prepared by the present application has the characteristics of high specific surface area, large pore volume and large pore size, and has a beneficial pore structure; in addition, the white oil hydrogenation catalyst has more acid active sites, more total weak acid amount, more B acid content and stronger B acid acidity.