179 results about "Alkaline earth oxides" patented technology

The invention discloses a copper-silicon catalyst as well as a preparation method and application thereof, and the copper-silicon catalyst comprises the following components in percentage by weight: 43-79wt% of silicon dioxide; the content of copper oxide is 15-35 wt%; the content of the auxiliary agent A is 3-10 wt%; the auxiliary agent B accounts for 3-12 wt%; the auxiliary agent A comprises one or more of alkali metal or alkaline earth metal oxides; and the auxiliary agent B comprises one or more of VB to VIIB group metal oxides. The raw materials of the catalyst are cheap and easy to obtain, the reaction condition is mild, the catalyst is environment-friendly, and the prepared catalyst is small in copper species particle size, high in dispersity, high in conversion rate and selectivity and good in stability.

The invention discloses an alkaline earth metal modified aluminum oxide loaded nickel-based catalyst as well as preparation and application thereof. The alkaline earth metal modified aluminum oxide loaded nickel-based catalyst comprises a nanofiber-shaped gamma-Al2O3 carrier, Ni and alkaline earth metal oxide, wherein the Ni and the alkaline earth metal oxide are loaded on the carrier; the alkaline earth metal is at least one of Mg and Ca. The invention provides application of the alkaline earth metal modified aluminum oxide loaded nickel-based catalyst in a methane dry reforming reaction or a methane cracking reaction. The thermal stability and the carbon deposition resistance of the catalyst can be effectively improved, and the catalyst has good catalytic performance in a methane dry reforming reaction and a methane cracking reaction.

The invention relates to aluminum borosilicate glass with low dielectric constant and low dielectric loss and a preparation method and application thereof, and relates to the field of aluminum borosilicate glass manufacturing, the aluminum borosilicate glass comprises the following main components by molar percentage: 60%-85% of SiO2, 0-10% of Al2O3, 2%-30% of B2O3, 0-20% of alkaline earth oxide, 0-10% of alkali metal oxide, 0-10% of ZnO, 0-1% of P2O5 and 0-2% of TiO2 and / or ZrO2; during preparation, the raw materials are melted, clarified and homogenized according to the corresponding dosage, and then are annealed for 3-8 hours at the temperature of 600-650 DEG C. The obtained aluminum borosilicate glass can reduce transmission loss during high-frequency signal transmission, has dielectric constant stability which does not exceed + / -0.5 change under a 1-30 GHz signal test, and can be applied to preparation of integrated antennas, electronic packaging and micro electro mechanical system packaging.

The invention provides a preparation method and application of ceramic slurry for high-temperature bonding of aluminum nitride ceramics, and relates to the technical field of high-temperature ceramic materials.The preparation method comprises the following steps that firstly, an organic carrier is prepared, a polymer binder, an organic solvent, a plasticizer and a dispersing agent are weighed according to the weight ratio and stirred at the temperature of 60-70 DEG C till complete dissolution and clarification are achieved for use; 2, an inorganic functional phase is prepared, aluminum nitride powder, yttrium oxide powder and alkaline earth metal oxide powder are weighed according to the weight proportion and placed in a ball milling tank to be evenly mixed, the obtained ceramic slurry serves as a bonding layer, the tolerable temperature can reach 1000 DEG C or above and is far higher than that of metal brazing filler metal, and the ceramic slurry is suitable for severe environments such as aerospace and high-temperature sensors. The main components of the bonding layer are consistent with the base material, and the thermal expansion coefficient is highly matched, so that the thermal stress can be greatly relieved, and the failure of the device caused by thermal fatigue in the temperature cycle is avoided.

The invention provides an alkali-salt composite excited low-carbon hydraulic cementing material based on an element compatibility method as well as a preparation method and application thereof, and relates to the technical field of building materials. Silica-aluminum solid waste (mainly providing SiO2 and Al2O3), a sulfate solid waste exciting agent (mainly providing alkali metal oxide and / or alkaline earth metal oxide and SO3) and an alkaline solid waste exciting agent (mainly providing an alkalinity environment required by a hydration reaction) are used as main materials to generate a certain content of hydration product ettringite crystals and C (N)-A-S-H gel, and a compatibility method is adopted for design. The relative contents of Ca, Si, Al and S in a cementing system are adjusted while the alkaline solid waste excitant and the sulfate solid waste excitant are compounded and cooperated to excite the silicon-aluminum solid waste, so that the contents of ettringite crystals and hydrated calcium silicate gel in the whole hydration system are controlled, and the early strength and the later strength of the alkali-salt compounded and excited low-carbon hydraulic cementing material are improved.

The invention discloses a corrosion-resistant sealing glass material for a lithium battery and a preparation method of the corrosion-resistant sealing glass material, and the sealing glass material comprises the following components in molar percentage: 20%-29% of SiO2, 12%-25% of Al2O3, 12%-25% of B2O3, 5%-15% of alkali metal oxide and 5%-15% of alkaline earth metal oxide. Wherein the alkali metal oxide comprises 1%-5% of LiO2, 1%-5% of K2O and 1%-5% of Na2O; the alkaline earth metal oxide comprises 1%-10% of BaO, 0%-5% of CaO and 0%-5% of SrO. By accurately controlling the content of each component, the sealing glass material with good sealing performance and excellent corrosion resistance is obtained, the corrosion of electrolyte to the glass material can be remarkably inhibited, and the stability and reliability of lithium battery products are remarkably improved; and the glass material has a thermal expansion coefficient matched with related metal, so that the thermal stress in the sealing process can be reduced.

The invention belongs to the field of energy catalysis and carbon resource utilization, and particularly relates to a self-regeneration perovskite / alkaline earth metal oxide composite bifunctional material and preparation and application thereof. The invention provides a composite bifunctional component formed by Ce doped perovskite A (Ti1-x-yCexNiy) O3 and alkaline earth metal oxide, and an adsorption-catalysis bifunctional material obtained after the composite bifunctional component is subjected to thermal reduction can realize carbon dioxide capture under a high-temperature condition and is converted into synthesis gas (CO and H2) in situ. By introducing Ce, the controllable dissolution and re-embedding process of Ni in ICCU-DRM reaction is promoted, lattice self-repairing and catalytic activity self-regeneration are realized, the stability of carbon dioxide conversion reaction is effectively improved, and the problem of inactivation caused by easy sintering and carbon deposition of a traditional Ni-based catalyst in dry reforming reaction is solved.

The present invention discloses a colored glass-ceramics, a preparation method thereof and an application. The colored glass-ceramics, in the form of oxides and by mass percentage, includes: a base component and a coloring component. The base component includes SiO2: 67% - 73%, R2O: 10% - 19%, Al2O3: 2% - 8%, B2O3: 0 - 0.5%, SnO2: 0 - 0.2%, ZrO2: 1.5% - 5%, RO: 0 - 3%, P2O5: 1.5% - 3.5%; the coloring component includes at least one of oxides of transition metals or rare earth elements, with a mass percentage of 0.02% - 6%; wherein, R2O is an alkali metal oxide; RO is an alkaline earth metal oxide. By adding a coloring component to the glass composition, the colored glass-ceramics presents the required color. By adjusting the proportion of each component, a glass melt with a low liquidus viscosity is obtained, and its forming temperature can be between 1060 - 1250°C, and the kinematic viscosity is 21000mm 2 / s - 57500mm 2 / s, which is applicable to the fusion leakage forming of platinum pipes or platinum forming devices.

The present invention discloses a waste plastic oil hydrofining catalyst and a preparation method thereof, the catalyst comprises an active component and a carrier, the total mass of the catalyst is 100%, the active component accounts for 10 wt%-30 wt%, the carrier accounts for 70 wt%-90 wt%, the carrier comprises a Ce (at) Cu-M / Al2O3 composite oxide, and M is an alkali metal oxide or an alkaline earth metal oxide. According to the present invention, the synthesized Ce (at) Cu-CaO / Al2O3 composite oxide is adopted in the carrier material, such that the chlorine resistance of the catalyst is improved, the dispersity and the carbon deposition resistance of the active component on the catalyst surface are significantly improved, the high hydrogenation activity of the catalyst is obtained, the hydrogenation catalysis performance of the catalyst is effectively improved, and the waste plastic oil hydrofining dechlorination effect is improved.

The invention discloses a friction material for brake pads and application thereof and belongs to the technical field of friction materials. The composite material is prepared from the following components in percentage by weight: 15 to 20 percent of composite fiber of chopped carbon fiber and ceramic fiber, 1 to 3 percent of carboxylation modified multi-walled carbon nanotube, 8 to 12 percent of polyimide modified phenolic resin, 0.5 to 1 percent of silane coupling agent KH-550, 5 to 8 percent of bionic multilayer graphene capsule, 3 to 5 percent of rare earth doped molybdenum silicide composite material, 8 to 12 percent of scaly soft iron powder and 10 to 15 percent of thermoelectric regulation type ZrO-BeO composite material. The catalyst comprises the following components in percentage by weight: 2-4% of porous molecular sieve loaded nano SbO, 5-10% of composite alkaline earth metal oxide, 5-10% of a shaped phase change material and 0.1-0.5% of a high-thermal-conductivity silicon carbide coating, a micron-sized through channel network with a high-thermal-conductivity silicon carbide coating is constructed in the material, and a shaping phase change material is combined, so that a multi-stage synergistic heat management mechanism of conduction heat dissipation, phase change heat storage and capillary flow enhanced heat dissipation is formed, friction heat can be quickly guided out from the surface and uniformly dispersed, and local high temperature and thermal stress are greatly relieved.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing dicyandiamide by urea pyrolysis with anti-scaling properties. The method includes a reaction process using urea, alkaline earth metal oxides, and a scale inhibitor dopant as raw materials. The scale inhibitor dopant includes at least one of silicon dioxide and titanium dioxide, and its weight accounts for 0.1% to 5% of the weight of the alkaline earth metal oxides. Experiments show that introducing a scale inhibitor dopant into the reaction system can alter the surface tension of the isocyanate melt, helping to improve the surface properties and rheological state of the intermediate melt. This reduces material adhesion and aggregation on the reactor wall, lowers the risk of scaling and clogging, and may even eliminate scale buildup on the reactor wall, thereby improving the stability of continuous production.

A method for stabilizing a reducing slag includes the steps of: subjecting a reducing slag which contains an alkaline earth metal oxide to a drying treatment, so as to obtain a dried reducing slag; mixing a urease-producing bacterium, a fermentation medium, and a nutrient, followed by conducting a fermentation treatment, so as to obtain a fermentation product containing urease; subjecting the fermentation product to a foam fractionation treatment, so as to obtain a foam containing urease; mixing the dried reducing slag, the foam containing urease, and urea, followed by conducting a urea hydrolysis reaction and a precipitation reaction in sequence, so as to obtain a product containing a stabilized reducing slag and a residual liquid; and subjecting the product to a solid-liquid separation treatment, so as to separate the stabilized reducing slag and the residual liquid from the product.

To provide a composition containing a novel ingredient that can bring about at least an acceptable level of sebum control in keratinous substances such as skin. [Solution] The present invention relates to a composition comprising (a) (i) at least one inorganic oxide, preferably a metal oxide, more preferably an alkaline earth metal oxide, and (ii) at least one fatty acid or a salt thereof, preferably a saturated fatty acid or a salt thereof, more preferably a metal salt of a saturated fatty acid, and (b) at least one second powder selected from particles containing silica and hydroxyapatite. The composition according to the present invention can provide at least an acceptable level of sebum control to keratinous substances such as skin.

To provide a glass substrate which has a low dielectric dissipation factor in high-frequency ranges, has high glass homogeneity, making it less apt to opacification, and offers excellent acid resistance.SOLUTION: The present invention pertains to a glass substrate containing, in mol percent on an oxide base: 0.1-13% of alkaline earth metal oxides in total; 1-40% of Al2O3 and B2O3 in total, where the molar ratio Al2O3 / (Al2O3+B2O3) is 0-0.45; and 0.1-1.0% of one or more selected from the group consisting of TiO2, Y2O3, and ZrO2 in total, where ZrO2 is 0.1% or less. The main component of the glass substrate is SiO2. The glass substrate has a dielectric loss tangent of 0.007 or less at 35 GHz.SELECTED DRAWING: None

The invention relates to a paint surface napping and polishing block and a preparation method and a forming method thereof, the paint surface napping and polishing block comprises the following raw materials in percentage: 58-60% of an abrasive material, 32-35% of a binding agent and 5-10% of a softening agent, the abrasive material comprises 30-80-mesh SiC and 80-120-mesh Al2O3 particles which are mixed according to a mass ratio of 1: 1, the binding agent comprises clay, alkali metal and alkaline earth metal oxides, and the softening agent comprises a mixture of borax and graphite powder. The preparation method comprises the following steps: mixing the raw materials in percentage, adding water, pressing into a mold, standing to form a plastic blank, putting into a heating furnace, heating and sintering in sections, and cooling the sintered grinding block to room temperature to obtain the grinding block. By increasing grinding material components and particle size mismatching, the grinding cutting force of the grinding block is guaranteed, meanwhile, the grinding block can be mixed with paint powder to be consumed in the paint surface napping and grinding process, the phenomenon that the paint powder on the surface of the grinding material adheres to and agglomerates is avoided, the effective working time is prolonged through dynamic consumption by means of the two-component design, the single-time operation area is increased, and the application and popularization value is high.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

The present invention relates to a coagulant for cementitious compositions, in particular cementitious compositions having a binder as a source of aluminate and / or sulphoaluminate, the coagulant comprises a source of an alkali metal carbonate, a metal sulfate, an alkali metal hydroxide, and optionally an alkali metal bicarbonate, an alkaline earth metal hydroxide, or an alkaline earth metal oxide. The invention also relates to cementitious compositions having a binder as a source of aluminate and / or sulphoaluminate and the coagulation accelerator according to the invention.

The present invention relates to the field of capacitor ceramic materials, and provides a ceramic raw material for capacitors and a preparation method thereof, aiming to solve the problem that traditional ceramic materials are difficult to achieve a balance between high dielectric constant and temperature stability. X Sr X TiO3 gradient layered particles are primarily composed of rare earth oxides, transition metal oxides, alkaline earth metal oxides, low-melting-point sintering aids, and organic processing aids. These gradient particles exhibit a concentric core-intermediate-shell structure, with the x value increasing radially, resulting in a continuous Curie temperature distribution. Their preparation involves precursor co-precipitation, calcination, layer-by-layer deposition, and secondary calcination. Wet ball milling and rheological manipulation are then used to achieve a highly uniform ceramic raw material. This material combines high dielectric properties with wide temperature stability, making it suitable for a variety of capacitor devices and promising application prospects.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

A mixture of pyrolyzed bio-aggregate, and a binder comprising alkaline earth metal oxide and / or alkaline earth metal hydroxide, and cementitious material in a ratio of at least 50:50, preferably 75:25

A variety of methods, systems, and compositions are disclosed, including, in one embodiment, a cement composition comprising an alkaline earth metal oxide, a soluble salt, a water-proofing agent comprising a divalent cation carbonate coated with fatty acid, and water. In other embodiments, the cement composition is introduced and allowed to set in a subterranean formation.

The invention belongs to the technical field of catalyst carriers, and particularly relates to a modified alumina carrier and a preparation method and application thereof, the modified alumina carrier comprises a modified alumina matrix and a carbon layer coating the surface of the modified alumina matrix; the mass of the carbon layer is 10-20% of the mass of the modified aluminum oxide matrix; the modified aluminum oxide matrix is prepared from the following components in percentage by mass: 1.5 to 3 percent of tin oxide, 8 to 11 percent of alkaline earth metal oxide and the balance of gamma-Al2O3. The mechanical strength and electron conductivity of the modified alumina carrier are increased by doping tin oxide and alkaline earth metal oxide, the specific surface area of the modified alumina carrier is increased by the carbon layer coating the surface of the modified alumina matrix, and the conductive network structure formed by the carbon layer has good conductivity. The electron conductivity of the modified aluminum oxide carrier is further improved.

The present invention relates to the technical field of 2-alcohol dehydration to generate alpha-olefins, and in particular to a catalyst for 2-alcohol dehydration and its preparation method and application, as well as a method for 2-alcohol dehydration to prepare alpha-olefins, the catalyst comprising: a main component, an alkaline earth metal oxide and a rare earth metal oxide, wherein the main component is selected from at least one of zirconium oxide, silicon oxide, titanium oxide and aluminum oxide; relative to 100 parts by weight of the main component, the content of the alkaline earth metal oxide is 0.05-10 parts by weight; the content of the rare earth metal oxide is 0.01-12 parts by weight. Acid and base groups are simultaneously present on the catalyst surface of the present invention, which can play a synergistic catalytic role in the catalytic process for alcohol dehydration, with better activity, selectivity and longer service life relative to a single acid site or base site.

The invention provides a spontaneous heating composite synergist as well as a preparation method and application thereof. The spontaneous heating composite synergist is prepared from the following components in parts by weight: 20 to 40 parts of a component A, 20 to 40 parts of a component B and 30 to 40 parts of a component C, wherein the component A comprises an alkali metal salt inner core and a first silane coupling agent and aluminate coupling agent composite shell layer which coats the outer surface of the alkali metal salt inner core through chemical bonds; the component B comprises an alkaline earth metal oxide core and a second silane coupling agent shell layer which coats the outer surface of the alkaline earth metal oxide core through a chemical bond; and the component C comprises an active metal core and a third silane coupling agent shell layer coated on the outer surface of the active metal core through a chemical bond. The self-heating composite synergist is subsequently applied to in-situ gasification, in-situ dry distillation, superheated steam gasification and supercritical water gasification of deep coal and has a relatively good heat-increasing synergistic effect.

This application provides nanocrystal glass, a preparation method, a nanocrystal glass product, and an electronic device, and belongs to the field of nanocrystal glass preparation technologies. The nanocrystal glass includes the following components in terms of mole percents of oxides: Al2O3: 30%-55%; CaO: 25%-55%; an alkaline earth metal oxide: 8%-20%; an alkali metal oxide: 3%-15%; B2O3: 0%-10%; and Sb2O3: 0%-1%. In the nanocrystal glass in embodiments of this application, alkaline earth metal ions and alkali metal ions are added to a glass system including calcium and aluminum, so that glass-forming performance is effectively improved while relatively high mechanical strength of the nanocrystal glass is maintained, thereby reducing a temperature and energy consumption for glass melting.

The invention discloses a catalyst for synthesis of tert-butyltoluene as well as a preparation method and application of the catalyst. The catalyst comprises a single-layer-structure MWW molecular sieve, a binder, a rare earth metal oxide and an alkaline earth metal oxide. The catalyst has the characteristics of high active site utilization rate and adjustable pore structure, and shows high activity and high para-position product selectivity in the alkylation reaction of toluene and isobutene.

The invention relates to the field of capacitor ceramic materials, provides a ceramic raw material for a capacitor and a preparation method of the ceramic raw material, and aims to solve the problem that high dielectric constant and temperature stability of a traditional ceramic material are difficult to consider at the same time. The ceramic raw material takes Ba1-XSrXTiO3 gradient layered particles as a main body, and is supplemented with a rare earth oxide, a transition metal oxide, an alkaline earth metal oxide, a low-melting-point sintering aid and an organic processing aid. The gradient particle has a concentric layer structure of core-middle layer-shell, and the x value is gradually increased along the radial direction to form continuous Curie temperature distribution. The preparation method comprises the steps of precursor coprecipitation, calcination, layer-by-layer deposition, secondary calcination and the like, and a high-uniformity ceramic raw material is obtained through wet ball milling and rheological regulation. The material has high dielectric property and wide temperature stability, is suitable for various capacitor devices, and has good application prospects.

Steel flat product for cold forming consisting of a steel substrate coated with a protective coating, wherein the protective coating consists of an inner Al-Si-containing and an outer alkaline earth oxide and / or transition metal oxide-containing layer, and wherein the steel substrate has a composition containing (in wt.%): - up to 0.09 carbon - up to 0.3 silicon - up to 0.9 manganese - up to 0.025 phosphorus - up to 0.02 sulfur - up to 0.1 aluminum - up to 0.14% titanium and / or niobium - up to 0.001 boron, and possibly - further alloying elements selected from the group up to 0.01 N, up to 0.15 Cu, up to 0.15 Cr, up to 0.15 Ni, up to 0.025 Mo, and / or up to 0.05 Sn, and - Residual iron and unavoidable impurities.

The invention discloses an iron-based catalyst, a preparation method of the iron-based catalyst, and an electrothermal catalytic synthesis ammonia method and system, and belongs to the field of synthesis ammonia catalysts, the iron-based catalyst comprises the following components by mass: 30-90% of a catalyst main component FeO1-x, 5-40% of a catalytic promoter and 10-80% of a conductive additive; the value range of x in the FeO < 1-x > is 0.01 to 0.1; the catalytic promoter comprises potassium oxide, aluminum oxide and alkaline earth metal oxide; the conductive auxiliary agent comprises at least one of a carbon-containing material and a conductive metal compound. The catalytic activity of the iron-based catalyst is effectively improved mainly through catalyst component design and dosage optimization. When the device is applied to an ammonia synthesis process, low-temperature, low-pressure and efficient electro-thermal catalytic ammonia synthesis is realized under the condition of no external heating, the ammonia production rate is remarkably increased, meanwhile, the ammonia production energy consumption is reduced, and the industrial application prospect is excellent.

A co-electrolysis system according to one embodiment of the present invention may comprise: a mixed gas supplier for supplying a mixed gas containing carbon dioxide and water vapor; a co-electrolysis device for co-electrolyzing the mixed gas to generate a synthetic gas containing carbon monoxide and hydrogen; a carbonator for mixing an alkaline earth metal oxide-containing material with the synthetic gas and carbonating the alkaline earth metal oxide-containing material and carbon dioxide to obtain a carbonate; and a calciner for calcining the carbonate to regenerate the carbonate into an alkaline earth metal oxide-containing material.