348 results about "Amorphous silicon dioxide" patented technology

An acidic amorphous silica-amumina has a large specific surface area and a large pore volume. A carrier complex and a hydrotreating catalyst containing acidic amorphous silica-alumina, in particular a hydrocracking catalyst containing acidic amorphous silica-alumina in combination with a modified zeolite-Y, treats petroleum hydrocarbon materials to produce middle distillates. The amorphous silica-alumina has a SiO2 content of 10-50 wt. %, a specific surface area of 300-600 m2/g, a pore volume of 0.8-1.5 ml/g and an IR acidity of 0.25-0.60 mmol/g. The catalyst shows a relatively high activity and mid-distillate selectivity and can be particularly used in hydrocracking process for producing mid-distillates with a higher yield.

An improved process for producing very high quality base stock and for simultaneous production of high quality middle distallates, comprising successive hydroisomerisation and catalystic dewaxing steps wherein hydroisomerisation is carried out in the presence of a catalyst containing at least one noble metal deposited on an amorphous acidic support, the dispersion of the metal being less than 20%. The support is preferably an amorphous silica-alumina. Catalytic dewaxing is carried out in the presence of a catalyst containing at least one hydrodehydrogenating element (group VIII) and at least one molecular sieve (preferably zeolite). The sieve is preferable selected from NU-10, EU-1, EU-13, zeolite and ferrierite.

The present invention is directed to a thick film conductor composition comprised of (a) aluminum-containing powder; (b) amorphous silicon dioxide (c) and one or more optional glass frit compositions; dispersed in (d) organic medium. The amorphous silicon dioxide contributes to significant bow reduction tendency for solar cells thinner than 270 microns and larger than five inches square without significant effect on reducing the electrical performance of the fired solar cell. In addition and as preferred by solar cell manufacturers, the addition of glass frit reduces the dusting tendency of the aluminum thick film composition.

A process for producing blended cement in which the cement contains Portland Cement mixed thoroughly with a microfiller, and possibly a water reducing agent, to provide a dry cement mixture, and fine supplementary cementitious materials selected from the materials blast furnace slag, fly ash, quartz, silica, amorphous silicon dioxide, limestone, and recycled concrete. The supplementary materials are first subjected to a grinding step in a dry state to a specific surface of at least 1000 cm²/g (Blaine). In a second step the ground supplementary materials are subjected to a grinding step together with at least 20% by weight of the total grinding mass of a highly reactive cement mixture in a dry state, to achieve a specific surface of at least 3000 cm²/g (Blaine).

The invention discloses a silicon monoxide composite cathode material for a lithium ion battery, and a preparation method thereof. The method comprises steps that: (1) silicon monoxide is sintered under a high temperature in an inert atmosphere, such that nano-sized silicon particles and amorphous silicon dioxide are produced; (2) a certain amount of sintered silicon monoxide and a certain amount of a conductive agent are accurately weighed, the materials are added into a planetary ball mill, and composite ball-milling is carried out upon the materials, such that the silicon monoxide composite cathode material is obtained, wherein silicon monoxide takes 30% to 90% of a total mass of the silicon monoxide composite cathode material. The silicon monoxide composite cathode material provided by the invention has advantages of high capacity, good cycling performance, and good conductivity. The preparation method has advantages of low raw material cost, simple preparation technology, and suitability for industrialized productions.

Disclosed is a compound soft magnetic material with operational performances of high-frequency and large power and process for preparing same. By adopting the technology of controlling the hydrolytic decomposition and sedimentation of ethyl orthosilicate under room temperature, the surfaces of iron powder particles with large grain diameters are evenly coated with amorphous silicon dioxide shells, thus Fe/SiO2 core-shell composite soft magnetic powder which is completely insulated with controllable shell thickness between 100 and 300 nanometers is manufactured, wherein SiO2 is 2-11 percent by mass, and Fe element is 89-98 percent by mass. The compound soft magnetic material with operational performances of high-frequency and large power and the process for preparing same are rich in raw material sources, simple in technological process, environment-friendly and suitable for industrialized production.

The invention relates to a material mixture for producing casting moulds for machining metal, to a method for producing casting moulds, and to a method which produces said casting moulds and to the use thereof. A fire-resistant moulding base material and a binding agent based on water glass is used in the production of casting moulds. A proportion of the particle-shaped metal oxide is added to the binding agent, said metal oxide being selected from the group of silicon dioxide, aluminium oxide, titanium oxide and zinc oxide. Synthetic amorphous silicon dioxide is preferably used as a metal oxide.

For producing very high quality base stock and for simultaneously producing high quality middle distillates, successive hydroisomerisation and catalytic dewaxmg steps are employed wherein the hydroisomerisation is carried out in the presence of a catalyst containing at least one noble metal deposited on an amorphous acidic support, the dispersion of the metal being 20%-100%. The support is preferably an amorphous silica-alumina. Catalytic dewaxing is carried out in the presence of a catalyst containing at least one hydrodehydrogenating element (group VIII) and at least one molecular sieve selected from ZBM-30, EU-2 and EU-11.

A process is described for preparing sorbitol by catalytic hydrogenation of a monosaccharide forming sorbitol on hydrogenation in the liquid phase, which comprises the catalyst being obtainable by:

• • i) single or multiple treatment of an amorphous silicon dioxide based support material with a halogen-free aqueous solution of a low-molecular-weight ruthenium compound and subsequent drying of the treated support material at below 200° C.,
  • ii) reducing the solid obtained in i) with hydrogen at from 100 to 350° C.,

step ii) being carried out immediately after step i).

A chewing gum base essentially free of non-silica fillers, comprising high molecular weight polyisobutylene, optionally amorphous silica and polyvinylacetate and powdered lecithin present in the chewing gum composition and optionally spray-dried flavor in the chewing gum composition.

The invention discloses melt-blown polypropylene as well as a preparation method and application thereof. The melt-blown polypropylene comprises following raw polypropylene resin, a degradation agent,an antioxidant and a lubricant, wherein the degradation agent is selected from one or more of hydrogen peroxide, sodium percarbonate, ammonium percarbonate and urea peroxide. The melt-blown polypropylene also comprises a nucleating agent selected from one or more of dibenzylidene sorbitol, aryl phosphate and nano scale amorphous silicon dioxide, wherein the degradation agent and the nucleating agent respectively account for 0.05-0.5% of the mass percentage of the raw materials. The preparation method comprises the following steps: premixing raw materials, stirring, then selectively adding a deodorant; and melting and granulating by an extruder to obtain the product. The invention also discloses an application of the melt-blown polypropylene in manufacturing melt-blown non-woven fabrics, melt-blown filter elements and sound-absorbing cotton. The melt-blown polypropylene has the advantages of low odor, high electret charge stability and the like.

The invention belongs to the technical field of nano materials, and relates to a transparent self-cleaning SiO2 anti-fogging coating and a preparation method thereof. A static self-assembly method is adopted, and hierarchical mesoporous SiO2 nanoparticles and polyelectrolyte are alternately assembled to form the super hydrophilic or hydrophobic transparent self-cleaning SiO2 anti-fogging coating.The coating consisting of the hierarchical mesoporous SiO2 nanoparticles has a hierarchical porous structure and a hierarchical rough structure on the surface; and the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles are positioned on the surfaces of the hierarchical mesoporous SiO2 nanoparticles, and comprise 2-5nm mesopores enclosed by amorphous silicon dioxide frameworkstructures and 5-30nm mesopores enclosed by amorphous silicon dioxide framework structures. Because of the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles and pores among thehierarchical mesopores, the transmittance of a glass plate coated with the hierarchical mesoporous SiO2 nanoparticles is improved from 90.4 percent to 92.0 percent.

The invention discloses a method for synthesizing ZSM-5 zeolite. The method comprises the following steps of: mixing an amorphous silicon dioxide solid silicon source, an aluminate aluminium source, water and ZSM-5 synthesizing mother liquor, crystallizing the mixture at the temperature of between 110 and 200 DEG C for 8 to 24 hours; and filtering, washing and drying the crystallized mixture to obtain ZSM-5 zeolite, wherein molar ratios of the components in the mixture are that: M2O/SiO2 is equal to 0.05-0.2:1, SiO2/Al2O3 is equal to 20-100:1, and H2O/SiO2 is equal to 5-15:1; and M is an alkali metal. In the method for synthesizing the ZSM-5 zeolite, the process is simple; the yield of single kettle is high; the crystallizing time is short; the emission of the mother liquor is reduced or zero emission of the mother liquor is realized; the synthesis and operation cost is relatively low; the B acid content of the obtained ZSM-5 zeolite is high; and the L acid content of the obtained ZSM-5 zeolite is low.

The oxygen-absorbing composition of the invention comprises 100 parts by weight of a carrier and an easily oxidizable organic composition that is carried on the carrier in an amount exceeding 210 parts by weight. The carrier comprises a calcium silicate compound represented by the following formula:

CaO.mSiO₂.nH₂O

wherein m is a number from 1.6 to 6.5 and n is a positive number, and has crystal structures constituted by aggregates of curved plate crystals comprising gyrolite calcium silicate and amorphous silicon dioxide. Because of a high flowability, the oxygen-absorbing composition of the invention is excellent in the productivity of the oxygen-absorbing packages. In addition, because of a large oxygen absorption per unit volume, the oxygen-absorbing package can be made compact in its shape. The oxygen-absorbing package is not detected by a metal detector because the contamination with iron components as impurities can be prevented.

The invention concerns a method for the manufacture of silicon tetrachloride by conversion of a mixture of finely divided and/or amorphous silicon dioxide, carbon and an energy donator with chlorine. Energy donators are metallic or silicon alloys such as silicon, ferrosilicon or calcium suicide. The addition of the donors effects a self-sustaining, exothermic reaction on one hand and a significant lowering of the reaction starting temperature on the other hand. As finely divided and/or amorphous silicon dioxide ashes containing silicon dioxide are primarily used. These are produced by the incineration of silicon-containing plant skeletal structures such as rice husks or straw. Other sources include silicas from the digestion of alkaline earth silicates with hydrochloric acid and filtered particulate from the electrochemical manufacture of silicon, as well as naturally occurring products containing silicon dioxide, such as diatomaceous earth kieselguhr).

The invention relates to a mould material mixture for producing casting moulds for metal processing, a process for producing casting moulds, casting moulds which can be obtained by the process and their use. The production of the casting moulds is carried out using a refractory base moulding material and a binder based on water glass. A proportion of a particulate metal oxide selected from the group consisting of silicon dioxide, aluminium oxide, titanium oxide and zinc oxide is added to the binder, with particular preference being given to using synthetic amorphous silicon dioxide. The mould material mixture contains a surface-active material as further significant constituent. The addition of the surface-active material enables the flowability of the mould material mixture to be improved, which makes it possible to produce casting moulds having a very complicated geometry.

A method for the production of inorganic aluminum substances and amorphous silica from aluminum oxide containing ores, comprising: (a) leaching of said ores with fluorosilicic acid to obtain aluminum fluosilicate solution; (b) filtering said leached solution from insoluble materials; and (c) washing said insoluble materials.

The invention discloses a preparation method of amorphous monodisperse nano silicon dioxide powder with controllable granularity and belongs to the field of an inorganic non-metal powder material. The preparation method comprises the specific steps: in a methanol solvent, selecting a silicon-containing organic matter as a silicon source and synthesizing silicon dioxide sol by utilizing an ammonia water catalyzed Stober method; ageing to obtain silicon dioxide gel; freezing and drying the gel to obtain silicon dioxide powder; mixing the powder and ethanol to form slurry and carrying out ball milling for 1h to 24h; drying in a drying oven at 50 DEG C to obtain the monodisperse amorphous silicon dioxide powder with the granularity in a range of 10nm to 100nm. A preparation process of the silicon dioxide powder is simple and the cost of the raw materials is low; large-scale industrial production of the silicon dioxide powder is easy to realize.

The invention relates to an apricot solid drink and a preparation method thereof. The ingredients of the apricot solid drink are 10-50% of apricot powder, 20-60% of maltodextrin, 10-30% of saccharose, 0.05-0.10% of citric acid, 0.1-0.2% of xanthan gum, 0.1-0.3% of sodium carboxymethyl cellulose, 0.03-0.1% of sodium alginate and 0.5-1.4% of amorphous silicon dioxide. The preparation method comprises the steps of pre-treating, washing and colour-protecting, blanching and cooling, pulping, zymohydrolysis, glue milling, homogenizing, spray drying, material mixing and granulating, packaging, and sterilizing. The solid drink has high fruit content, natural flavour, excellent stability, and convenient carry and use, thereby meeting requirements of modern consumption and having broad market prospect.