44 results about "Cesium compound" patented technology

A method of readily producing a gradient optical element having infrared absorbing ability by easily forming a refractive index distribution in a desired portion of a glass substrate having infrared absorbing ability without requiring a specific treatment atmosphere nor using a molten salt.

More specifically, the present invention provides a method for producing a gradient-index optical element having infrared absorbing ability, the method comprising applying a paste containing an organic resin, an organic solvent, and at least one compound selected from the group consisting of lithium compounds, potassium compounds, rubidium compounds, cesium compounds, silver compounds, copper compounds, and thallium compounds onto a glass substrate containing an alkali metal component, at least one member selected from the group consisting of iron, copper, cobalt and vanadium, and over 3 wt. % of iron, when contained singly among iron, copper, cobalt and vanadium, on an Fe₂O₃ basis, taking the total weight of the glass as 100 wt. %, and heating the glass substrate at a temperature below the softening temperature of the glass substrate.

The invention relates to a nanometer vanadium catalyst for preparing sulfuric acid through oxidizing SO2 and a preparation method thereof. The nanometer vanadium catalyst which uses diatomite as a carrier to load V2O5 contains cesium oxide and lanthanum oxide, and raw materials of the nanometer vanadium catalyst comprise, by mass, 4-5.5% of V2O5, 0.01-5% of a cerium-containing compound, 1-3% of a thiosulfate, 1-10% of a cesium-containing compound, 0.01-5% of a lanthanum-containing compound, and 0.5-7% of a surfactant and an organic macromolecular compound. According to the finished nanometer vanadium catalyst, V2O5 is nanometer grade V2O5; the ignition temperature is 340-350DEG C; the operation temperature of the catalytic reaction is 360-370DEG C; and the SO2 volume concentration is 3-12%, the total conversion rate is equal to or greater than 99.7% and the SO2 emptying amount is equal to or less than 400mg/m<3> when the catalytic reaction adopts a 3+2 flow of a converter. The prepared catalyst has the advantages of low ignition temperature, high activity, high use stability, good compressive strength, and low abrasion.

The invention discloses a high-transparency high-heat-insulation thermal phase change material preparation method. The method includes steps: firstly, preparing VO2 nanopowder with primary particle size not larger than 20nm, namely preparing powder V; secondly, preparing antimony-tin hydroxide precursors with primary particle size not larger than 20nm; thirdly, preparing indium-tin hydroxide precursors with primary particle size not larger than 20nm, namely preparing powder I; fourthly, preparing tungsten-cesium compound precursors with primary particle size not larger than 20nm, namely preparing powder W; fifthly, adding 1wt%-99wt% of the powder V into a composition formed by any one, two or three of the powder A, the powder B and the powder W, putting in a dispersion tank, grinding, dispersing, performing freeze drying, pouring into a crucible, calcining for 3-48h at 460-680 DEG C under an atmosphere of inert gas shielding, and cooling to obtain a high-transparency high-heat-insulation thermal phase change material. The prepared nanopowder can be widely applied to window glass surface coating materials of automobiles, buildings and the like and has significant economic and energy saving values.

The invention relates to a preparation method for a composite silver catalyst used for producing ethylene oxide through ethylene oxidation. The preparation method comprises the following steps: 1) dissolving a compound containing silver and a compound containing chromium in an amine-contained solution or ammonia water so as to prepare a silver-ammonia solution; 2) subjecting an alpha-Al2O3 carrier to soaking in the silver-ammonia solution prepared in the step 1), taking out the soaked alpha-Al2O3, then carrying out draining, and carrying out calcination treatment so as to prepare a semi-finished silver catalyst; 3) dissolving the compound containing silver, the compound containing rhenium and an optional compound containing cesium in the amine-contained solution or the ammonia water so as to prepare the silver-ammonia solution; and 4) subjecting the semi-finished silver catalyst prepared in the step 2) to soaking in the silver-ammonia solution obtained in the step 3), taking out the soaked semi-finished silver catalyst, then carrying out draining, and carrying out calcination treatment so as to prepare the composite silver catalyst. The invention also relates to the composite catalyst and application of the catalyst in production of ethylene oxide.

A filter type trapping agent for volatile cesium compound and trapping method for volatile cesium compound thereof are provided. More particularly, a filter type trapping agent for volatile cesium compound including silica 40˜65% by weight of silica, 15˜30% by weight of alumina, 5˜15% by weight of iron oxide, 1˜15% by weight of molybdenum oxide, 1˜10% by weight of chromium oxide, and 1˜10% by weight of vanadium oxide and trapping method for volatile cesium compound thereof are provided. Through a filter type trapping agent for volatile cesium compound and a trapping method, only cesium can be selectively separated among the nuclear fission gases. Accordingly, by disposing only the filter where cesium is trapped, the efficiency of an off-gas process improves, expense for disposing filter wastes decreases, and a cesium isotope of the waste filter can be recycled. Therefore, many forms of cesium compound gas are made insoluble efficiently.

The invention discloses a series of lead-free full-inorganic silver-sodium mixed double perovskite alloy nanocrystal materials, which are prepared by the following steps: adding a cesium-containing compound, sodium acetate, silver acetate and indium acetate into a flask, adding 1-octadecene, oleic acid and oleylamine, stirring and mixing, and vacuumizing at 105 DEG C for 1 hour; introducing nitrogen, heating to 185 DEG C at a speed of 5 DEG C/min, injecting a chlorine-containing compound at 170 DEG C, quickly performing ice bath to room temperature when the temperature is 185 DEG C, centrifuging to remove the supernatant, washing twice with toluene, centrifuging to remove the supernatant, dispersing the precipitate into n-hexane, and centrifuging to remove the precipitate, thereby obtaining the nanocrystal colloid. According to the invention, the preparation method is simple, the toxicity problem of the lead-based perovskite is solved, the stability of the perovskite nanocrystal is improved, the fluorescence property of the perovskite nanocrystal is improved by regulating the ratio of sodium to silver, and the perovskite nanocrystal material has a good application prospect in the photoelectric field.

The invention discloses a cesium-containing high-voltage lithium ion battery electrolyte composite additive, an electrolyte and a battery thereof. The cesium-containing high-voltage lithium ion battery electrolyte composite additive provided by the invention is formed by compounding a cesium compound, silicon-based phosphate and a phosphorus-containing lithium salt. Through the synergistic effectof the cesium compound, the silicon-based phosphate and the phosphorus-containing lithium salt, components of positive and negative electrode interfaces are changed, a composite interface film capableof stably existing at high voltage is formed on positive and negative electrode interfaces, and the composite interface film can effectively improve the interface characteristics of the high-voltagebattery, reduce the side reaction of an electrolyte and improve the electrochemical performance of the lithium ion battery. And the composite additive has the advantages of small addition amount, lowcost, simple synthesis and the like, is easy to implement and is beneficial to wide popularization and application.

The present invention provides a method of producing an optical element without the need for high vacuum, unlike the thin film deposition methods, and without using a molten salt. More specifically, the invention provides a method of producing an optical element comprising applying a paste containing at least one compound selected from lithium compounds, potassium compounds, rubidium compounds, cesium compounds, silver compounds, and thallium compounds, an organic resin, and an organic solvent to a glass substrate containing an alkali metal component as a glass component and then performing heat treatment at a temperature below the softening temperature of the glass substrate.

A flat fluorescent lamp and a liquid crystal display apparatus having the flat fluorescent lamp are provided. The flat fluorescent lamp includes a lamp body having first and second substrates that face each other and discharge spaces that are formed therebetween, and a protective member that is formed on an inner surface of at least one of the first or second substrates, wherein the protective member includes a cesium compound.

Disclosed is a process for purifying a cesium compound which includes an ionic impurity comprising: calcium, sulfate, magnesium or mixtures thereof comprising: reacting impurities comprising calcium, sulfate, magnesium or mixtures thereof in a solution including the solubilized starting cesium compound with suitable precipitating agents to form an insoluble precipitate including the impurity or impurities. Preferred precipitating agents include barium ion to precipitate sulfate ionic impurities as barium sulfate; hydroxyl ion to precipitate magnesium ionic impurities as magnesium hydroxide and to precipitate calcium ionic impurities as calcium hydroxide; and carbon dioxide or carbonate ion to precipitate calcium ionic impurities as calcium carbonate. Also disclosed is a process for producing a predetermined cesium compound. The process comprises treating a cesium-including material with a suitable reagent to dissolve at least a portion of the cesium contained in the material and form a slurry; adding a base comprising slaked lime or calcium carbonate and, if necessary to produce the desired cesium compound, an acid including the anion of the predetermined cesium compound to the slurry comprising the dissolved cesium; and separating the predetermined cesium compound. A drilling fluid or heavy medium separation fluid comprising a purified cesium compound and having a specific gravity of between about 1.2 g/cm<3> and about 2.5 g/cm<3> and having less than 85 % by weight of the predetermined cesium compound on a solution basis is also disclosed.

Curable mixtures free from compounds of molybdenum and of tungsten and comprising

• (A) at least one constituent containing blocked isocyanate groups (a1) and isocyanate-reactive functional groups (a2), and
• (B) at least one cesium compound;

processes for preparing them, and their use.

A coated catalyst for the catalytic gas-phase oxidation of aromatic hydrocarbons, which is a catalytically active composition containing a certain amount of vanadium oxide, titanium dioxide, cesium compound, phosphorus compound and antimony oxide on an inert, non-porous carrier, wherein the catalytic The active composition is applied in two or more layers, with the antimony oxide content of the outer layer being 50-100% lower than that of the inner layer or each inner layer, wherein the amount of the catalytically active composition in the inner layer or each inner layer is the amount of the catalytically active composition 10-90% by weight of the catalyst can be used for the preparation of carboxylic acids and/or acid anhydrides, especially phthalic anhydride, and the invention also provides a production method for these catalysts.

The invention discloses a preparation method of high-purity metallic rubidium and cesium. The preparation method comprises the steps of (1) preheating and dehydrating rubidium and cesium compounds; (2) carrying out primary reduction to obtain metallic cesium and primary reduction residues; (3) carrying out primary rectification on metallic cesium in the inert atmosphere, so as to obtain a primaryrectification product and primary rectification residues, and carrying out secondary rectification on the primary rectification product in the inert atmosphere, so as to obtain high-purity metallic cesium and secondary rectification residues; (4) mixing the primary reduction residues, the primary rectification residues and the secondary rectification residues with a secondary reducing agent, and carrying out secondary reduction to obtain metallic cesium, metallic rubidium and secondary reduction residues; (5) carrying out vacuum distillation separation on metallic cesium and metallic rubidium,so as to obtain a vacuum distillation product and a distillation residual liquid; and (6) carrying out distillation on the vacuum distillation product in the inert atmosphere for two times, so as toobtain two-time distillation products and high-purity metallic rubidium. The method is particularly suitable for separating the mixed rubidium and cesium compounds in which rubidium and cesium are mixed together to recycle and obtain high-purity metallic rubidium and high-purity metallic cesium.

The invention belongs to the technical field of catalysts, and relates to a platinum-based catalyst containing cesium or a cesium compound. The platinum-based catalyst comprises a catalytic active substance and a catalytic auxiliary substance, the catalytic active substance comprises metal platinum, the catalytic auxiliary substance comprises a cocatalyst, and the cocatalyst comprises one or moreof elementary substances or compounds of a single isotope Cs-134 or Cs-137 of cesium. The platinum-based catalyst containing cesium or the compound thereof has better catalytic performance and stability.

The invention discloses a method for determining cesium and compounds thereof in air of a workplace. The method comprises the following steps: sampling for a short time and a long time at a sampling point by adopting a sampling clamp provided with a microfiltration membrane; placing the sampled microporous filter membrane in a beaker, adding pure water and dilute nitric acid for digestion, and finally fixing the volume to a volumetric flask to keep the nitric acid acidity of 1% (v/v); analyzing the sample solution by adopting an inductively coupled plasma mass spectrometer, and determining the content of cesium and compounds thereof in the sample solution according to the spectral intensity; and calculating through a formula to obtain the concentration of cesium and cesium compounds in air. The method overcomes the defects of traditional cesium and cesium compound detection, avoids chemical interference and ionization interference, improves the elution efficiency of cesium in the microfiltration membrane, realizes analysis and determination of trace and ultra-trace cesium and cesium compound, and ensures the accuracy and reliability of caesium and cesium compound occupational hazard factor detection results in a precise cesium processing technology.

The invention discloses a Cs4CuSb2Cl12 layered halide double perovskite material as well as a preparation method and application of the Cs4CuSb2Cl12 layered halide double perovskite material. The chemical formula of the layered halide double perovskite material is Cs4CuSb2Cl12. The preparation method comprises a solution preparation method and a mechanical force preparation method. The solution preparation method comprises the following steps: mixing a cesium-containing compound, an antimony-containing compound and a copper-containing compound according to a proper molar ratio, and adding the mixture into a mixed solution of an organic solvent and an acid solvent; performing ultrasonic treatment on the obtained solution to obtain black precipitate, and performing centrifugal treatment to separate out the black precipitate; and washing the obtained black precipitate with acetone so as to obtain the black Cs4CuSb2Cl12 layered halide double perovskite material. The mechanical force preparation method comprises the following steps: mixing the cesium-containing compound, the antimony-containing compound and the copper-containing compound according to a proper mass ratio, and putting the mixture into a mortar; grinding the mixture in the mortar to obtain a black product; and scraping off the black product, collecting powder, and washing the powder with acetone to obtain the black Cs4CuSb2Cl12 layered halide double perovskite material. The material provided by the invention has good stability, is friendly to human body and environment, has a direct band gap of 1.77 eV, is simple in preparation method and suitable for industrial production, and has wide application prospects in the photoelectric fields of photovoltaic cells, optical detectors, illumination, display, backlight sources and the like.

The invention discloses a perovskite compound chloride catalyst and application thereof. The catalyst comprises a carrier, a copper-cesium compound chloride of a perovskite structure loaded on the carrier or a copper-cesium compound chloride doped with a third metal chloride, wherein the third metal is selected from one of Sn, Mn, Bi, Ba, Sr, Zn and In and the carrier is selected from active carbon, a nitrogen-containing carbon material, a carbon nano tube and graphene; and the mass ratio of the carrier to the copper element to the cesium element to the third metal is 100 to (0.5-10) to (0.5-12) to (0-1). The perovskite compound chloride catalyst disclosed by the invention is applied to hydrochlorinating acetylene to synthesize chloroethylene, and has the advantages of high catalytic activity, good chloroethylene selectivity, good stability and long service life.