55 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 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 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.

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.

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.

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.

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

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 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.

The present invention relates to colloidal silica useful as abrasive particles. Specifically, the colloidal silica has a first peak at 533 ± 0.5 eV and a second peak at 534 ± 0.5 eV in a spectrum obtained by X-ray photoelectron spectroscopy (XPS), the first peak having an intensity greater than that of the second peak, and has a first scattering peak at 465 ± 35 cm-1 and a second scattering peak due to amorphous silica at 1360 ± 30 cm-1 in a spectrum obtained by Raman spectroscopy.

The invention describes the use of a particulate material comprising, as a single component or one of a plurality of components, a particulate synthetic amorphous silica as an additive for a mixture of moulding materials, the silica having a median particle size distribution in the range of 0.1 to 0.4 m, measured by means of laser scattering, the molding material mixture comprises at least: a refractory mold base material having an AFS particle fineness in the range of 30 to 100; a particulate amorphous silica having a median particle size distribution in the range of 0.7 to 1.5 m, measured by means of laser scattering; and a water glass for enhancing the moisture resistance of a molded body that can be produced by heat curing of the molding material mixture. The invention likewise describes corresponding methods, mixtures and kits.

The invention relates to a battery arrangement (10), in particular for use in electric vehicles, comprising two or more battery units (12a, 12b), wherein a flat separating element (14) that is arranged at least between two adjacent battery units (12a, 12b) separates the battery units (12a, 12b) from one another at least in some portions and comprises: i) an element core (16) comprising a first core layer (18), wherein a mass fraction of 70% or more of the first core layer (18) consists of porous, amorphous silicon dioxide, based on the mass of the core layer (18); ii) a plastic sheath (20) encasing the element core (16) and comprising a plastic material.

The application discloses a kind of simulation near wellbore radial layered permeability loss combined formation physical model and preparation method thereof.The method uses sand type 3D printing technology, with furan resin and amorphous silica sand as raw material, and is integrally formed to prepare combined formation model containing prefabricated wellbore structure, which is composed of inner / middle / outer three independent concentric cylinder structures, realizes the simulation of permeability loss of each part of formation by vacuum permeation modifier post-processing.The inner / middle / outer three independent concentric cylinder structures are 3D printed according to the designed inner and outer diameter size, and to ensure the smooth assembly of three parts of structure, the inner diameter size of each part of structure is designed to reserve 0.5-1mm deformation redundancy (deformation joint).In the vacuum permeation post-processing process, nanometer silicon dioxide solution is used as modifier, vacuum saturation device is used for vacuum permeation treatment of component, and by changing the negative pressure holding time (5-10min) of each cycle and the vacuum saturation cycle number of each component, the independent and quantitative control of permeability of different structure layers is realized, so as to obtain the combined formation model with radial layered permeability difference from wellbore outward.The method can accurately and quantitatively prepare simulation near wellbore formation radial heterogeneous permeability loss, and has the advantages of flexible operation, low cost and strong controllability, which can provide reliable model preparation method for physical simulation of oil and gas reservoir development and underground pollutant migration.

The present invention discloses a functionalized ordered mesoporous organosilicon microsphere with a Yolk-Shell structure and a preparation method thereof. The preparation steps include: (1) using functionalized nanoparticles as cores, utilizing a sol-gel chemical synthesis method, and wrapping a layer of amorphous silica on the surface of the functionalized nanoparticles through a hydrolysis and condensation process of a silicon source precursor at room temperature to obtain functionalized core-shell particles; (2) using the functionalized core-shell particles as seeds, dispersing them in a mixed solution containing deionized water, ethanol, ammonia water and a surfactant, adding organosilane to react, and obtaining functionalized ordered mesoporous organosilicon microspheres with a Yolk-Shell structure. Compared with the "post-etching method" preparation technology, the "quasi-one-step method" of the present invention has mild reaction conditions, simpler and more efficient preparation steps; in addition, by adopting different functionalized cores, Yolk-Shell mesoporous microspheres with different functions can be obtained, which has good universality.

The invention discloses a method for preparing an amorphous silicon-aluminum-based oxide by utilizing lithium slag and a product thereof, and relates to the technical field of recycling of lithium slag. According to the method, an acetate buffer system with a controllable pH value is adopted as a precipitation conditioning agent, and the speed of pumping the lithium slag pickle liquor into the precipitation conditioning agent is accurately controlled, so that simultaneous and disordered precipitation of various metal hydroxides and silicon-aluminum compounds caused by drastic change of the local pH value of the system in the precipitation process can be remarkably improved; the content of impurities in an amorphous silicon-aluminum-based oxide product is high; the pH value of the whole precipitation system can be always maintained at the optimal precipitation window of silicic acid and aluminum hydroxide, so that the silicon-aluminum compound in the lithium slag is more thoroughly precipitated, and the yield of the silicon-aluminum compound can be obviously improved; the method has the advantages of high yield, high purity, adjustable silica-alumina ratio in the product, simple and mild preparation process and good controllability, and is suitable for large-scale preparation of the amorphous silica-alumina-based oxide.

The invention relates to an adsorbent for CO2, to the production of said adsorbent and to the use thereof as a fixed bed adsorbent, comprising a shaped body of amorphous silica having a dimension in the range of 0.5 mm to 30 mm in at least one dimension and at least one adsorbent medium for CO2, the molded body is functionalized with at least one adsorption medium for CO2.

The invention provides a recycling method based on inherent properties of sludge pyrolytic carbon, which comprises the following steps: S1, carrying out online and rapid three-stage classification on pyrolytic carbon discharged from a furnace after pyrolysis, entering the step S2 into the first-stage carbon, entering the step S3 into the second-stage carbon, and entering the step S4 into the third-stage carbon; s2, the first-grade carbon is sequentially subjected to a combined process of washing with dilute sulphuric acid to remove dust and then physical activation with water vapor at 600-800 DEG C to prepare activated carbon with a high specific surface area so as to realize resource utilization; s3, grinding the secondary carbon, doping the secondary carbon into brick making clay or ceramsite raw materials according to the mass ratio of 10%-20%, and sintering and molding to realize resource utilization; or mixing the secondary carbon with low-concentration alkali liquor, carrying out hydrothermal reaction at 150-200 DEG C, and converting amorphous silica-alumina in the secondary carbon into P-type zeolite for adsorbing ammonia nitrogen so as to realize resource utilization; and S4, the third-grade carbon is subjected to a stabilization process of calcium dihydrogen phosphate solution dipping and calcination, so that the heavy metal is converted into stable phosphate minerals, and the stable phosphate minerals are used as a filling material of a roadbed or an ecological landfill.

A battery separator has performance enhancing additives or coatings, fillers with increased friability, increased ionic diffusion, decreased tortuosity, increased wettability, reduced oil content, reduced thickness, decreased electrical resistance, and / or increased porosity. The separator in a battery reduces the water loss, lowers acid stratification, lowers the voltage drop, and / or increases the CCA. The separators include or exhibit performance enhancing additives or coatings, increased porosity, increased void volume, amorphous silica, higher oil absorption silica, higher silanol group silica, reduced electrical resistance, a shish-kebab structure or morphology, a polyolefin microporous membrane containing particle-like filler in an amount of 40% or more by weight of the membrane and ultrahigh molecular weight polyethylene having shish-kebab formations and the average repetition periodicity of the kebab formation from 1 nm to 150 nm, decreased sheet thickness, decreased tortuosity, separators especially well-suited for enhanced flooded batteries.

The invention discloses a nano-composite metal ion doped cobalt blue pigment for glass ink as well as a preparation method and application thereof. The pigment is a nano-particle with a core-shell structure, wherein the core layer is a cobalt blue spinel phase doped with multi-element metal ions, the chemical general formula of the core layer is Co-x-y MxNyAl-z PzO, M and N are divalent metal ions, M is one or more of alkaline earth metal ions and zinc ions, and N is transition metal ions; p is a trivalent metal ion, and is one or more of a lanthanide rare earth ion and a first transition ion; and the shell layer is an amorphous silicon dioxide layer. The preparation method comprises the following steps: preparing a doped precursor by a coprecipitation method, performing high-temperature calcination to form a metal ion doped spinel core, coating a SiO shell layer by a sol-gel method, and performing medium-high-temperature heat treatment. The color development stability, the color saturation, the glossiness and the dispersity of the pigment are remarkably improved, and the pigment is adjustable in hue, bright in color and suitable for high-performance glass ink.

The present invention generally relates to transition metal(s) (mono and bimetallic) catalysts supported on crystalline silica. Specifically, the present invention relates to the process for production of crystalline silica from fumed / amorphous silica using non-noble or transition metal Fe at lower temperatures. The method of present invention is cost effective, eco-friendly and more industrially feasible than already known methods. It is useful in production of CO by CO2 hydrogenation reaction with 100% selectivity.