91 results about "Barium oxide" patented technology

The invention provides a composite hydrogen transfer catalyst based on an MOFs material as well as a preparation method and application of the composite hydrogen transfer catalyst. The composite hydrogen transfer catalyst comprises the MOFs material loaded with an active metal component and solid alkali, the active metal component is selected from at least one of palladium, platinum, ruthenium, rhodium and nickel; the active metal component accounts for 0.5-5% of the mass of the catalyst; the MOFs material is selected from at least one of ZIF-8, MIL-101, UiO-66, HKUST-1 and MOF-5 (Metal Organic Frameworks); the solid alkali is selected from at least one of magnesium oxide, calcium oxide, hydroxyapatite and barium oxide. The catalyst provided by the invention has the advantages of high catalytic activity, good selectivity, strong stability, reusability and the like, can efficiently catalyze fatty alcohol to perform hydrogen transfer reaction under a lower-temperature reaction condition to prepare Guerbet alcohol, remarkably improves the yield and purity of a product, and reduces the reaction energy consumption and cost.

Glass compositions include one or more of phosphorus oxide (P2O5), niobia (Nb2O5), titania (TiO2), potassium oxide (K2O) and lithium oxide (Li2O) as essential components and may optionally include barium oxide (BaO), zinc oxide (ZnO), V2O5 (vanadia), FeO (iron oxide) and other components.

This invention relates to the field of glass-ceramic technology, specifically providing a low-temperature co-fired ceramic, its preparation method, and its application. The raw materials for the low-temperature co-fired ceramic include VSBBS glass frit and ceramic frit, with the total weight of the VSBBS glass frit and ceramic frit being 100%. The mass percentages of the VSBBS glass frit and ceramic frit are 20-40% and 60-80%, respectively. The raw materials for the VSBBS glass frit, by mass percentage, include 10-30 wt% vanadium oxide, 10-30 wt% antimony oxide, 10-30 wt% barium oxide, 10-20 wt% boron oxide, and 30-50 wt% silicon oxide, with the sum of all oxides being 100%. The LTCC material obtained by this invention achieves excellent millimeter-wave dielectric properties, with a relative permittivity between 4.8 and 6.8, a dielectric loss less than or equal to 0.001, and a flexural strength of 180-230 MPa.

Provided is an anti-counterfeiting composition for anti-counterfeiting fibers, including a carrier, an anti-counterfeiting tracer and a dispersant, wherein the anti-counterfeiting tracer is composed of barium oxide, strontium oxide, aluminum oxide and zinc oxide, and a barium element content, a strontium element content, an aluminum element content, and a zinc element content in the anti-counterfeiting composition is controlled to a fixed feeding mass ratio; in percent by mass, the sum of the barium element content, strontium element content, aluminum element content, and zinc content accounts for 5-50% of the anti-counterfeiting composition; the carrier is a matrix polymer or a bio-derived oil. The anti-counterfeiting composition of the present disclosure can give the anti-counterfeiting fiber advantages of memory tracking properties and identification functions, high anti-counterfeiting capability, and good anti-counterfeiting concealment.

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 invention discloses a cooling anti-radiation coating. The cooling anti-radiation coating comprises a surface coating, a middle coating and a bottom coating, the surface coating comprises the following components in percentage by weight: 40-60% of polyethylene, 1-5% of carbon nanotubes, 1-5% of graphene oxide, 10-15% of a dispersant, 5-8% of polyethylene glycol, 3-8% of nano barium oxide and 3-10% of nano boron nitride. The intermediate coating comprises the following components in percentage by weight: 50%-70% of polyurethane, 20%-30% of a silane coupling agent and 5%-10% of aluminum oxide; the bottom coating comprises the following components in percentage by weight: 70%-80% of resin, 7%-9% of talcum powder, 2%-4% of aluminum oxide and 3%-10% of hydroxyethyl cellulose. The cooling anti-radiation coating formed by the synergistic cooperation of the components has high electromagnetic shielding performance and long service life.

The invention discloses a high-speed rail sound screen wall self-repairing nano coating and a preparation method thereof, and belongs to the technical field of coatings, sodium alginate is crosslinked with calcium ions in calcium chloride, gel microspheres are formed on the surface of porous shell powder, a self-repairing agent is wrapped in the gel microspheres, barium nitride is hydrated to form barium hydroxide under the excitation action of water, and the self-repairing nano coating is formed. Barium hydroxide belongs to an alkaline compound, and through the wrapping effect of the microcapsule, the corrosion effect on a modified binder in a system can be reduced, so that the material has the advantages of light weight, sound insulation, good acid and alkali resistance, washing resistance and compressive strength; polyvinyl alcohol is used as a bridge, hydroxyl of polyvinyl alcohol is combined with carboxyl of carboxymethyl chitosan and then copolymerized with vinyl acetate to form a three-dimensional network structure, cohesive force of the adhesive and adhesive force to a base material are greatly improved, calcium ions are separated out due to the alkaline effect of barium hydroxide, and meanwhile the crosslinking strength of the adhesive can be improved; the bonding strength is further improved.

This invention discloses a slab with a crystalline effect. The slab includes a blank layer, on the surface of which a glaze modifier is applied to form a glaze modifier layer. The glaze modifier comprises the following raw materials in parts by weight: 5-8 parts potassium feldspar, 4-7 parts calcined talc, 3-5 parts modified translucent stone agent, 3-5 parts calcium oxide, 2-4 parts barium oxide, 1-3 parts cobalt oxide, and 2-4 parts strontium carbonate modifier. The slab with a crystalline effect of this invention is formed by applying the glaze modifier. The glaze modifier uses potassium feldspar, calcined talc, calcium oxide, barium oxide, and cobalt oxide as a matrix. By adding strontium carbonate modifier and modified translucent stone agent, the two are synergistically enhanced, improving the crystalline effect of the product and increasing its stain resistance and easy-to-clean properties. Simultaneously, the product exhibits significant improvements in scrub resistance and alkali corrosion resistance.

This disclosure relates to systems and methods for gas mitigation. In one aspect of the disclosure, a battery is presented. The battery has a de-gassed lithium-manganese rich battery cell and a lithium-based anode packaged with a lithium-manganese-rich cathode, saturated in an electrolyte. A barium oxide-based coating is in the de-gassed lithium-manganese rich battery cell, and configured to convert oxygen and carbon dioxide into barium peroxide and carbonate and retain the barium peroxide and carbonate.

The invention provides a lithium ion battery gas getter. The present disclosure relates to systems and methods for gas mitigation. In one aspect of the present disclosure, a battery is presented. The battery has a degassed lithium-rich manganese battery cell and a lithium-based anode encapsulated with a lithium-rich manganese cathode saturated in an electrolyte. A barium oxide-based coating is in the degassed lithium-rich manganese battery cell and is configured to convert oxygen and carbon dioxide to barium peroxide and carbonate and retain the barium peroxide and the carbonate.

The application relates to the technical field of inorganic nonmetallic materials, and particularly discloses a foamed ceramic material and a preparation method thereof. The material is prepared from solid waste-based main materials, a foaming agent and a stabilizing additive containing barium oxide, magnesium oxide and titanium dioxide. The preparation method comprises the following steps: after the raw materials are mixed according to the proportion, wet ball milling is carried out to prepare slurry, the obtained slurry is sprayed and dried to prepare powder, and finally, the powder is sintered and formed under a specific sintering system in an air atmosphere. By introducing a BaO-MgO-TiO2 ternary synergistic stabilization system, the technical problems of unstable solidification, interference in the foaming process and uneven product performance existing in the traditional carbon reduction method for treating chromium-manganese-containing solid waste are effectively solved, long-term chemical fixation of harmful elements in the ceramic matrix is realized, a foamed ceramic product with excellent environmental safety and good physical performance is successfully prepared, and a new way is provided for high-value resource utilization of large quantities of industrial hazardous waste.

The invention relates to the field of inorganic non-metallic materials, and discloses a high-brightness long-afterglow luminescent ceramic material and a preparation method thereof.The material is composed of calcium fluoride, zinc sulfide, strontium sulfide, kaolin, quartz, albite, titanium dioxide, barium oxide, iron oxide and phosphorus pentoxide, a SiO2-Y2O3 crystal boundary regulation phase is introduced, the luminous efficiency and trap level distribution are optimized, and the luminous efficiency is improved. The preparation method comprises the steps of raw material ball milling, pre-sintering, cold press molding, three-section gradient hot pressed sintering, reduction annealing and polishing, and high densification and crystal grain controllable growth are achieved through staged temperature control pressurization. The initial brightness of the obtained material is greater than or equal to 800cd / m, the afterglow is greater than or equal to 11 hours, and the standard deviation of luminescence uniformity is lt; and the process is compatible with a conventional production line, the energy consumption is low, the cost is controllable, and the method is suitable for the fields of emergency indication, building decoration, intelligent wearing and the like.

The application relates to the field of gas sensors, and particularly discloses an electrochemical acetylene sensor electrode, a preparation method thereof and an electrochemical acetylene sensor. The electrochemical acetylene sensor electrode comprises a polytetrafluoroethylene film and a slurry coated on the polytetrafluoroethylene film, wherein the slurry comprises nano gold particles, nano magnesium oxide, nano barium oxide, modified conductive carbon powder and a Nafion solution in a weight ratio of (0.47-0.50):(0.02-0.20):(0.02-0.18):(1-3):(0.6-2.0); and the modified conductive carbon powder is obtained by mixing potassium permanganate, deionized water and conductive carbon and then performing ball milling. The application realizes the effects of high sensitivity and high linearity of acetylene gas, greatly improves the selectivity of the electrochemical acetylene sensor, and has the advantages of low detection limit, high sensitivity and good selectivity.

The invention belongs to the technical field of glue joint glue layer development and nondestructive detection, and particularly relates to a glue layer nondestructive development and online detection method. The adhesive layer is formed by compounding bamboo strips and a nano modified adhesive, and the nano modified adhesive comprises 0.5%-1.0% of multi-walled carbon nanotubes and 6.0%-8.0% of metal oxides (such as bismuth oxides, tungsten oxides, barium oxides and the like) with high X-ray attenuation characteristics. The preparation method comprises the steps of optimized bamboo strip pretreatment, nano adhesive preparation, gluing assembly, hot-pressing curing and the like. Based on the high X-ray attenuation characteristic of metal oxidation and in combination with a convolutional neural network, an accurate nondestructive testing method is provided, the three-dimensional glue joint continuity is measured by extracting multiple characteristics of distribution of the glue layer containing nanoparticles, prediction of the glue joint strength of the glue layer is achieved, and the prediction error is lower than 5%. Through the synergistic effect of multi-walled carbon nanotubes and metal oxidation with the high X-ray attenuation characteristic, the bonding strength of the adhesive layer is remarkably improved, and the composite material is suitable for an assembly type building bearing structure and has the advantages of being environmentally friendly, excellent in mechanical property, monitorable in quality and efficient in resource utilization.

The invention relates to a method of providing an ore concentrate solution suitable for beneficiation processing, the method including the step of contacting an ore with one or more metal bases at elevated temperature. The one or more metal bases at elevated temperature may form a super-alkaline media that partially or fully dissolves the ore. Typically, the one or more metal bases are alkali metal bases, preferably chosen from lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide or caesium hydroxide, or alkaline earth bases, preferably chosen from calcium hydroxide, barium hydroxide or strontium hydroxide. The one or more metal bases at elevated temperature may form a super-alkaline media that partially or fully dissolves the ore.

This invention relates to the technical field of barium hydroxide preparation, specifically to a method for producing barium hydroxide monohydrate. The method includes: pulverizing barite raw material; mixing the pulverized barite with rice husk ash and soda ash; calcining at 1100-1200℃ and holding at that temperature for 90-120 minutes; then cooling the mixture in a kiln to below 80℃ to obtain porous crude barium oxide; dispersing the crude barium oxide in water; filtering and washing the residue with deionized water to obtain the filtrate; heating the filtrate to 80-85℃; slowly adding a mixed desulfurizing agent composed of zinc oxide, calcium oxide, and manganese tetroxide for desulfurization; filtering and washing to obtain a barium hydroxide solution; concentrating and crystallizing to obtain Ba(OH)₂·8H₂O crystals; and then drying and dehydrating under vacuum to obtain barium hydroxide monohydrate. The purpose of this invention is to provide a method for producing barium hydroxide monohydrate that achieves low-cost, simple, stable product quality, and environmentally friendly production.

This invention provides an electronic-grade glass fiber composition and its glass fiber cloth, relating to the field of glass fiber technology. The electronic-grade glass fiber composition comprises: alumina, silicon oxide, magnesium oxide, calcium oxide, barium oxide, additives, and fillers; the mass ratio of alumina, barium oxide, and additives is (20-40):(2-8):(2-5); the additives are metal A and metal B in a mass ratio of (1-5):(1-5); metal A includes at least one selected from titanium, vanadium, chromium, manganese, iron, cobalt, and nickel. Metal B includes at least one selected from lanthanum, cerium, praseodymium, scandium, and yttrium. The electronic glass fiber cloth prepared from the electronic-grade glass fiber composition of this invention has high tensile strength and low moisture regain during long-term storage.

The invention provides a multiphase microcrystal glass fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) placing mixed glass powder in a kiln, and sequentially melting, homogenizing and clarifying to obtain mixed glass liquid; wherein the mixed glass powder comprises SiO2 (silicon dioxide), Al2O3 (aluminum oxide), Li2O (lithium oxide), P2O5 (phosphorus pentoxide), ZrO2 (zirconium oxide), MgO (magnesium oxide), CaO (calcium oxide), TiO2 (titanium oxide), Na2O (sodium oxide), K2O (potassium oxide), BaO (barium oxide), ZnO ( (2) enabling the mixed glass liquid to flow out through a gradient heating furnace, and entering a heat preservation tank for devitrification to obtain microcrystalline glass liquid; wherein crystals in the glass ceramic liquid comprise at least one of lithium disilicate, lithium silicate, petalite or cordierite; and (3) enabling the microcrystalline glass liquid to flow out through a temperature control bushing plate, and drawing to obtain the multiphase microcrystalline glass fiber. According to the scheme, through cooperation of the components and the process, it is ensured that controllable devitrification of the glass is completed, meanwhile, good high-temperature fluidity is maintained, continuous preparation from molten glass to the multiphase microcrystalline glass fiber is successfully achieved, and the obtained glass fiber product has the high elastic modulus, the low dielectric constant and the low thermal expansion coefficient.

The invention discloses glass encapsulation slurry and a preparation method and application thereof, and belongs to the technical field of encapsulation slurry, the glass encapsulation slurry comprises the following components by mass: 60-70% of glass powder, 20-25% of a solvent, 6-12% of resin, 0.5-2% of a leveling agent, and 0.5-2% of a dispersant; the glass powder comprises the following components in percentage by mass: 51-66% of silicon oxide, 10-15% of boron oxide, 6-15% of alkaline earth metal oxide, 11-18% of alkali metal oxide, 1-3% of a stabilizer and 1-3% of a clarifying agent; the alkali metal oxide comprises lithium oxide and sodium oxide in a mass ratio of (1-3): (10-15); the alkaline earth metal oxide comprises barium oxide and calcium oxide in a mass ratio of (5-10): (1-5); the stabilizer comprises zirconium oxide; the clarifying agent comprises cerium oxide. The glass encapsulation slurry has a wide use window in the application field of electronic components.

The invention provides a low-temperature pressureless sintering preparation method of high-transparency AlON ceramic, and belongs to the technical field of preparation of transparent ceramic. The low-temperature pressureless sintering preparation method of the high-transparency AlON ceramic, provided by the invention, comprises the following steps: S1, adding barium oxide into ethanol and AlON powder, carrying out ball milling by using a ball milling medium, and screening and calcining to obtain a mixture of the AlON powder and barium oxide; s2, the mixture is subjected to dry pressing forming to form a biscuit, then the biscuit is placed in a cold isostatic press after being subjected to vacuum pumping and sealed storage, and a compact biscuit is obtained through cold isostatic pressing forming; s3, the compact biscuit is placed in a nitrogen atmosphere sintering furnace to be sintered at the temperature of 1750 DEG C, the heat preservation time of sintering is 6-10 h, and the high-transparency AlON ceramic is obtained. The AlON transparent ceramic obtained by the method is high in transmittance, low in sintering temperature, short in sintering time and low in energy consumption.

The invention discloses a ceramic bond which comprises the following raw materials in parts by weight: 30-50 parts of silicon dioxide, 15-30 parts of boric acid, 4-6 parts of aluminum oxide, 4-8 parts of barium oxide, 5-10 parts of aluminum oxide, 5-10 parts of zinc oxide, 4-8 parts of sodium carbonate, 1-5 parts of calcium carbonate, 1-5 parts of magnesium oxide and 1-10 parts of lithium carbonate. The invention further discloses a diamond grinding wheel prepared from the ceramic bond. The diamond grinding wheel is prepared from the following raw materials in percentage by weight: 10-20% of the ceramic bond, 50-60% of diamond micro powder, 5-10% of white corundum, 10-20% of a pore forming agent and 5-15% of resin powder. The ceramic bond is low in firing temperature, tightly combined with diamond micro-powder and high in holding force, the porosity of the prepared diamond grinding wheel reaches 70%, the abrasive ratio is low, and meanwhile the stability is high in the using process.

The invention discloses high-light-yield boron gadolinium silicate scintillation glass with a wide aluminum content range and a preparation method and application of the high-light-yield boron gadolinium silicate scintillation glass. The scintillation glass comprises a matrix and light-emitting central ions dispersed in the matrix, the boron-gadolinium silicate scintillation glass with the wide aluminum content range and the high light yield comprises a matrix and light-emitting central ions dispersed in the matrix, wherein the matrix comprises the following components in percentage by mass: 3-15% of silicon dioxide, 5-15% of silicon dioxide, 5-15% of silicon dioxide, and the balance of water. 4 to 11% of diboron trioxide; 50 to 70% of gadolinium oxide; 6-20% of gadolinium fluoride; 4-20% of aluminum oxide; 1-3% of gallium oxide; 2-5 parts of barium oxide; 0.5 to 1.5 percent of calcium oxide; the content of the luminescent central ions is 2-9%, and the sum of the proportions of the components is 100%. The gadolinium borosilicate scintillation glass is characterized in that gadolinium trioxide, silicon dioxide and diboron trioxide are used as main components, a large amount of aluminum oxide is added, so that the gadolinium borosilicate scintillation glass has high density, high light yield and high transmittance, and the preparation cost of the high-performance scintillation glass is remarkably reduced.

The invention relates to the technical field of preparation of BaTiO3 powder, in particular to a method for preparing nanoscale BaTiO3 powder through plasma ball milling, which comprises the following steps: taking BaCO3 and TiO2 as raw materials, adding Ba (OH) 2.8 H2O, mixing, and carrying out ball milling reaction to obtain reacted powder; according to the method, a traditional solid phase method and a water bath method are combined, added Ba (OH) 2.8 H2O can gradually remove crystal water in the heating process, and the Ba (OH) 2.8 H2O is decomposed at about 400 DEG C to generate amorphous barium oxide with high reaction activity. The BaTiO3 powder can be subjected to a solid-phase reaction with TiO2 under the condition that the temperature is far lower than the decomposition temperature of BaCO3, the initial temperature required by barium titanate nucleation is further reduced, conditions are created for the whole solid-phase reaction at a relatively low temperature, the production efficiency of the BaTiO3 powder is improved, and the BaTiO3 powder has the advantages of being simple in process, low in cost, suitable for industrial production and the like.

The invention provides a dielectric layer material for an electrostatic chuck and a preparation method of the dielectric layer material, and relates to the technical field of electrostatic chucks. The dielectric layer material for the electrostatic chuck comprises silicon dioxide, calcium oxide, zinc oxide, zirconium oxide, aluminum oxide, boric oxide, barium oxide, titanium oxide and functional filler, wherein the functional filler is a rare earth oxide core and glass phase shell material; the rare earth oxide in the rare earth oxide core-at-glass phase shell material is one or more of scandium oxide, yttrium oxide or lanthanum oxide. The dielectric layer material for the electrostatic chuck has the characteristics of plasma erosion resistance and low sintering temperature at the same time.

The present invention relates to a method for producing polyester in a polycondensation reaction catalyzed by aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof. The present invention also relates to a composition containing aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof as a catalyst for polyester production in a polycondensation reaction. Furthermore, the present invention relates to the use of aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof as heterogeneous polycondensation catalysts. Aluminum titanate compounds, barium titanate compounds, calcium titanate compounds, zinc titanate compounds, or mixtures thereof are amorphous mixed oxides of aluminum oxide (and / or barium oxide, and / or calcium oxide, and / or zinc oxide) with titanium oxide. These titanate compounds have been found to be excellent heterogeneous catalysts in polycondensation reactions for producing polyesters such as polyethylene terephthalate.

The application discloses a method for catalytic oxidative cleavage of aromatic ether substances. The method is that aromatic ether substances, metal-base composite catalysts and water medium are placed in an autoclave, and oxygen-containing gas is filled for hydrothermal reaction; the metal-base composite catalysts contain metal active components and base active components, wherein the metal active components are ruthenium, palladium, platinum, copper or cobalt, and the base active components are magnesium oxide, barium oxide or calcium oxide; the method can catalytically oxidize and cleave the aromatic ether substances into high-value-added small organic molecules such as phenols and carboxylic acids with high selectivity, and does not need to use organic solvent medium and add a large amount of inorganic base, and has the characteristics of simple process, high product added value and the like, and can produce important economic value and social benefits.

The invention relates to the fields of chemical industry, pyrotechnic compositions, fireworks and crackers and the like, and relates to preparation of barium fumarate serving as a novel compound material with coloring agent and reducing agent effects, and preparation and application of the material in the fields of pyrotechnic compositions, fireworks and crackers and the like. The preparation method comprises the following steps: mixing fumaric acid and barium carbonate or barium oxide or barium hydroxide, and heating an aqueous solution to prepare barium fumarate; furthermore, the barium fumarate can be fully mixed with selected other substances to prepare a green pyrotechnic composition, and the green pyrotechnic composition is applied to fireworks and crackers and other fields; in addition, the barium fumarate is mixed with other selected substances, a small amount of perchlorate can be selectively added and fully mixed to prepare non-pyrotechnic composition or pyrotechnic composition substances in various geometrical shapes, and then the substances are placed in handheld, ground and air (including aircrafts) devices or equipment to be used for preparing the non-pyrotechnic composition or pyrotechnic composition. The non-pyrotechnic composition and the pyrotechnic composition substance can be ignited according to the electronic heating principle, and green light is emitted through combustion for color development.

We provide phosphate glass with a high refractive index and low density. [Solution] The glass composition contains phosphorus oxide (P2O5), niobia (Nb2O5), barium oxide (BaO), and potassium oxide (K2O) as essential components, and may optionally contain titania (TiO2), calcium oxide (CaO), sodium oxide (Na2O), lithium oxide (Li2O), bismuth oxide (Bi2O3), strontium oxide (SrO), tungsten oxide (WO3), and other components, with the total of TiO2 + Nb2O5 being 1.0 mol% or more and 55.0 mol% or less. The glass can be characterized by a high refractive index at 587.56 nm at relatively low density at room temperature.

This invention belongs to the field of catalytic materials technology, specifically relating to a monodisperse nanoscale BaO-supported MWW molecular sieve catalyst, its preparation method, and its application. The catalyst uses MWW molecular sieve as a support, dispersing and loading BaO nanoparticles. 90-95% of the BaO nanoparticles are monodisperse nano-barium oxide, with an average size in the nanometer range, and at least 90% are dispersed on the outer surface of the molecular sieve. At least 80% of the crystals in the support possessing the MWW topology are 2.5-20 nanometer layered nanosheets. The total specific surface area of ​​the catalyst is 300-500 m². 2 / g, with the external specific surface area accounting for no less than 30% of the total specific surface area. Compared with the prior art, this invention solves the problems of easy agglomeration and poor accessibility of active sites of BaO catalysts. This scheme achieves uniform dispersion of BaO particles at the nanoscale on the outer surface of molecular sieves, thereby exhibiting excellent catalytic activity and selectivity in PET saccharification reaction.

The present application relates to a kind of scheelite type nickel-based catalyst for hydrogen production by self-thermal reforming of acetic acid.The present application is directed to the problem of oxidation, sintering, carbon deposition of existing catalysts in the process of self-thermal reforming of acetic acid, and a scheelite type Ni-based catalyst with BaWO4 as the main body and containing NiWO4 component is prepared by coprecipitation method, which limits the aggregation of active components and the growth of crystal grains, significantly improves the sintering resistance, carbon deposition resistance and hydrogen production rate of the catalyst. The catalyst of the present application has the following composition by weight percentage of oxides: 12.5%-18.3% nickel oxide, 69.0%-83.5% barium oxide, and 2.1%-15.3% tungsten trioxide, and the sum of the weight percentages of each component is 100%.