33 results about "Amorphous silica" patented technology

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.

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.

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.

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 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 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.

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.

A method of producing acrolein from glycerol comprising introducing in a reactor a heteropoly acid catalyst comprising amorphous silica having heteropoly acid groups; preheating the catalyst in the re

The invention relates to an amorphous silica-alumina material and a preparation method thereof, a hydrocracking catalyst and application of the hydrocracking catalyst, an inorganic silicon source and an aluminum source are used as raw materials, the amorphous silica-alumina material is prepared by adopting a coprecipitation method, and the amorphous silica-alumina material rich in a large amount of moderate-strength acid sites can be prepared by controlling the acid-base conditions of different preparation stages. The material is especially suitable for being used as a carrier raw material of a hydrocracking catalyst for increasing the yield of middle fractions, and has a good application prospect.

To provide a method for producing a geopolymer foam having good appearance even when grain ash is used as a raw material.SOLUTION: The method for producing a geopolymer foam includes reacting a silicate of a metal having a valence of 2 or more with an alkali metal silicate to form a reaction slurry containing a geopolymer, and foaming the geopolymer in the reaction slurry with a foaming agent to form a geopolymer foam having a large number of cells, wherein as the alkali metal silicate, an alkali metal silicate solution obtained by adding a cereal ash containing 60% by mass or more of an amorphous silica component to an alkali metal ion-containing alkali solution is used. The total content of a carbon-containing substance and an insoluble metal oxide in the alkali metal silicate solution is controlled to ≤ 4 mass%.SELECTED DRAWING: None

This invention discloses a method for efficiently preparing micron-sized silica microspheres using water glass via reverse-phase suspension dispersion. Utilizing the principle of preparing a weak acid from a strong acid, different types of silicic acid compounds and different organic phases are mixed in proportion, and different types / concentrations of acid are added dropwise under high-speed dispersion conditions to initiate the reaction. After silica microspheres precipitate, dispersion continues for a period of time. Following precipitation, washing, and drying, monodisperse micron-sized amorphous silica microspheres of different particle sizes are obtained. The water glass used in this invention is low-cost, eliminates the need for emulsifiers, greatly simplifies the operation process, and allows for the recycling of the organic phase. The entire preparation process is simple, energy-efficient, cost-effective, and environmentally friendly. The micron-sized silica microspheres prepared by this invention contain a large number of hydroxyl groups, have a large specific surface area, allow for particle size control, and exhibit high sphericity. This method has significant advantages and promising applications in the preparation of micron-sized silica microspheres.

The invention relates to building material mixtures comprising a building substrate, water glass, amorphous silica and one or more alkaline earth metal compounds, and to the production of molds and cores, in particular for metal casting.

A vacuum insulating panel may include: a first glass substrate; a second glass substrate; a plurality of spacers provided in a gap between at least the first and second substrates, wherein the gap is at a pressure less than atmospheric pressure; and a seal having at least a first seal layer provided between at least the first and second substrates. Amorphous or substantially amorphous silica (e.g., fused silica) may be used in the seal layer, and in the composite material for forming same. In order to form a layer of the seal for the edge seal and / or tube seal, a glass composition may be provided such as in a paste which may also include filler (which may include the amorphous silica), binder and / or solvent. The glass composition (e.g., the glass, such as glass powder, present in a paste before firing) for use in forming the seal layer may include one or more of tellurium oxide, bismuth oxide, and / or vanadium oxide, and may be designed to increase the density of the seal layer.

Disclosed are composite materials comprising a porous, carbonated, calcium silicate ceramic having a microstructure comprising interconnected open pores; where the calcium silicate surface defining the pores is partially or completely coated with an amorphous silica layer, and the silica coating comprises an overlayer of calcium carbonate crystals; where the silica coating and calcium carbonate overlayer form a network that interconnects throughout the ceramic microstructure, but do not completely occlude the pores. Also disclosed are methods of forming such composite materials.

Provided are amorphous silica having a specific BET specific surface area and a method for producing the same, etc. Amorphous silica that is aggregated particles in which silica of nanoparticles is aggregated, the particle size (D50) of the aggregated particles being 0.5-50 μm, and the BET specific surface area being 300 m2 / g or higher. The amorphous silica can be prepared by carbonizing a pressure molded product of a silica-containing plant, mixing an alkaline solution with the carbide obtained and separating the solids to obtain a silicic acid salt solution, adjusting the solution to a pH of 0.5-2.5 to precipitate the silica, and, after 24 h, washing and drying the silica which has a pH of 0.5-2.5.

The present invention relates to a battery device (10), particularly a battery device for use in electric vehicles, comprising two or more battery cells (12a, 12b), wherein a planar separating element (14) is arranged between at least two adjacent battery cells (12a, 12b), the planar separating element separating the battery cells (12a, 12b) at least partially separating them from each other, wherein the planar separating element (14) comprises: i) a core (16) comprising a first core layer (18), wherein 70% or more of the mass of the first core layer (18) is composed of porous amorphous silica relative to the mass of the core layer (18), and ii) a plastic casing (20) enclosing the core (16), the plastic casing comprising a plastic material.

This invention relates to the field of diamond abrasive technology and discloses a method for preparing diamond abrasives with a microcrystalline glass bond resistant to pure water corrosion. The method involves surface activation pretreatment of diamond micropowder to obtain activated diamond micropowder; coating the activated diamond micropowder with amorphous silica to obtain pretreated diamond micropowder; uniformly mixing the microcrystalline glass bond, pretreated diamond micropowder, and binder, followed by pressing to obtain a molded blank; and then subjecting the molded blank to gradient sintering to obtain the microcrystalline glass bonded diamond abrasive. The microcrystalline glass bond of this invention is an alkali-free formulation, which effectively improves the water and acid resistance of the composite material. Through reasonable component formulation, a high degree of compatibility with the thermal expansion coefficient of diamond is achieved, enhancing the dimensional and thermal stability of the grinding wheel during the grinding process.

To provide a method for producing amorphous silica using chaff derived from a plant as a raw material.SOLUTION: The method includes a step of hydrolyzing chaff, a step of baking the hydrolyzed chaff, a step of pulverizing the baked chaff, and a step of removing an impurity from the pulverized chaff using a magnetic bar. The chaff has pores with a pore size of 5 to 200nm and has no thorns on the surfaces.SELECTED DRAWING: Figure 1

The present application relates to the field of catalyst preparation, and discloses a modified amorphous silicon-aluminum catalyst, a preparation method and application thereof.The method comprises the following steps: (1) hydrogenation pretreatment of a copper-zinc-chromium-zirconium component; (2) mixing of an amorphous silicon-aluminum catalyst with the product obtained in step (1), and sequentially performing first drying, first calcination and hydrothermal treatment; wherein the silicon-aluminum ratio of the amorphous silicon-aluminum catalyst is 1.5-3, and the copper-zinc-chromium-zirconium component has the following general formula composition: Cu a ZnCr b Zr c O z , wherein a is 0.1-10, b and c are each independently 0.1-5, and z is the number of oxygen atoms satisfying the valence of each metal element.The catalyst obtained by the preparation method has high carbon tetraolefin conversion rate and carbon octaolefin selectivity.

This invention provides a construction material that is sustainable and environmentally friendly, and a ground improvement method using it, which can be used for structures as well as ground improvement applications, by using materials that can be supplied stably and do not cause environmental problems such as environmental pollution or increased carbon dioxide emissions. [Solution] A construction material whose main component is incinerated ash obtained by burning waste derived from marine and / or land products, wherein amorphous silica incinerated ash is the main component and Ca-containing incinerated ash containing at least Ca is used as a reactant, and which is used for structural purposes or as a solidifying agent in chemical grouting, high-pressure jet mixing, or mixing-type ground improvement methods. A ground improvement method using the above construction material when improving the ground by chemical grouting, high-pressure jet mixing, or mixing-type ground improvement methods.

The invention relates to the technical field of high polymer materials, in particular to high thixotropic silica gel as well as a preparation method and application thereof. The high thixotropic silica gel comprises the following raw materials in parts by weight: 100 parts of silicon resin, 0.1-0.8 part of a catalyst, 0.2-1 part of a reaction stabilizer, 5-10 parts of a cross-linking agent, 4-15 parts of a diluent, 0.5-2 parts of a thickening agent and 5-10 parts of fumed silica, and the fumed silica is selected from polymethyldichlorosilane modified HDK amorphous silica and / or polymethyldisiloxane modified amorphous silica. According to the high-thixotropic silica gel, stable printing of a ceramic needle with the inner diameter of 15 microns is achieved, meanwhile, the height-width ratio of a printed single-layer material can reach 0.7 or above, the high-thixotropic silica gel is suitable for electronic packaging and coating and 3D printing and is also suitable for silk-screen printing, the transmittance is kept at 93% or above when a coating with the thickness of 60 microns is formed after curing, and the high-thixotropic silica gel is suitable for large-scale production. And the material has excellent room-temperature storage stability in a single-component state.

The invention discloses a coal gasification fine slag all-component high-value utilization method based on carbon ash dissociation and gradient extraction, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: firstly, efficiently recovering carbon residues through an ultrasonic-assisted-oil agglomeration coupling technology to prepare a porous carbon material; then, high-gradient magnetic separation is used for recycling fine iron powder; carrying out normal-pressure leaching on the tailings subjected to decarbonization and iron removal by using medium-low-concentration alkali liquor to extract amorphous silicon dioxide, and preparing aerogel or white carbon black; extracting an aluminum component from the alkaline leaching filter cake through acid leaching to prepare polyaluminum chloride or aluminum oxide; and finally, synergistically preparing the geopolymer cementing material from the acid leaching residues and a part of alkali leaching byproduct water glass. The method realizes 100% directional conversion of carbon, iron, silicon, aluminum and calcium-based components in the gasified slag, solves the bottleneck problems of difficult carbon residue separation, difficult silicon and aluminum extraction and difficult tailing absorption in the traditional process, and has significant economic and environmental benefits.