518 results about "Caesium" patented technology

A nitrogen oxide storage material is disclosed which contains at least one storage component for nitrogen oxides in the form of an oxide, mixed oxide, carbonate or hydroxide of the alkaline earth metals magnesium, calcium, strontium and barium and the alkali metals potassium and caesium on a high surface area support material. The support material can be doped cerium oxide, cerium/zirconium mixed oxide, calcium titanate, strontium titanate, barium titanate, barium stannate, barium zirconate, magnesium oxide, lanthanum oxide, praseodymium oxide, samarium oxide, neodymium oxide, yttrium oxide, zirconium silicate, yttrium barium cuprate, lead titanate, tin titanate, bismuth titanate, lanthanum cobaltate, lanthanum manganate and barium cuprate or mixtures thereof.

The invention discloses a method for extracting high-value alkali metal from salt lake brine or seawater through membrane extraction-back extraction. The method is implemented through continuous operation and comprises the following steps of: fixing an ion exchange blend membrane in a membrane component, allowing an organic solution containing an extracting agent to contact salt lake brine or seawater which contains alkali metal ions by a first ion exchange membrane, and allowing alkali metal ions to pass through the ion exchange membrane and be combined with the organic solution containing the extracting agent to obtain metal complex; then transmitting an organic solution of the metal complex to a second ion exchange membrane and allowing the organic solution of the metal complex to contact a back extraction solution by the second ion exchange membrane, and allowing the metal ions to pass through the ion exchange membrane to enter the back extraction solution; during membrane extraction-back extraction, and circulating feed liquid, the back extraction solution and the organic solution containing the extracting agent on one side of the first ion exchange membrane, on one side of the second ion exchange membrane and between the first and second ion exchange membranes; and performing back extraction until a certain concentration of the back extraction solution is reached, and separating lithium, rubidium or caesium precipitates to obtain the final product. The invention provides a high-efficiency, low-cost and feasible route for industrial production of alkali metal salts.

The invention provides a catalyst for oxidizing and eliminating formaldehyde at room temperature and a preparation method thereof. The catalyst comprises a carrier, a noble metal active ingredient and an adjuvant, wherein the carrier is a compound or a mixture consisting of two or more than two oxides, the noble metal active ingredient at least comprises one of noble metal elements, including ruthenium, rhodium, palladium, platinum, gold or silver; the adjuvant at least comprises one of alkali metal elements, including lithium, sodium, potassium or cesium; the noble metal active ingredient is 0.01-0.099% of the total quality of the catalyst based on the noble metal element, and the adjuvant is 0.01-0.25% of the total quality of the catalyst based on the alkali metal element. Under the condition that the percentage of the used noble metal active ingredient is very low based on the total quality of the catalyst, the catalyst has a high elimination factor on formaldehyde, therefore the cost of the catalyst can be reduced, and catalyst is likely to be popularized and used.

The invention relates to a poly-dopamine coated nano-micro powder and a preparation method thereof. The mass ratio of the nano-micro powder to poly-dopamine is (1:1)-(1:9), the dimensional size of the nano-micro powder is 1 nanometer to 50 micrometers, and the coating thickness of the poly-dopamine is less than or equal to 300 nanometers. The poly-dopamine coated nano-micro powder can be used for protection of powder, such as vanadium oxide, with high activity and easy to be oxidized and deteriorated, and also can be used for bridge connection between powder with relatively a few radical groups on the particle surface and difficult to be firmly bonded with a substrate and the substrate, such as caesium doped tungsten oxide, aluminum oxide, tin oxide, metal copper, metal silver, a carbon material and polyaniline.

A catalyst composition represented by the following empirical formula which is useful in production of unsaturated nitrites by ammoxidation:wherein F represents at least one element selected from the group consisting of zirconium, lanthanum and cerium, G represents at least one element selected from the group consisting of magnesium, cobalt, manganese and zinc, H represents at least one element selected from the group consisting of vanadium, niobium, tantalum and tungsten, x represents at least one element selected from the group consisting of phosphorus, boron, and tellurium, Y represents at least one element selected from the group consisting of lithium, sodium, rubidium and cesium, the suffixes a-k, x and y represent a ratio of atoms or atomic groups, and a=0.1-3, b=0.3-15, c=0-20, d=3-8, e=0.2-2, f=0.05-1, e/f>1, g=0-5, h=0-3, k=0.1-1, x=0-3, y=0-1, i is the number of oxygen produced by bonding of the above respective components, and j=0-100.

The invention relates to a synthesizing method of inorganic perovskite nanosheets. The method includes: adding the precursor solution of cesium into the precursor solution of lead halide, performing ultrasonic treatment for 10-30 minutes to obtain a mixed solution, transferring the mixed solution into a reaction kettle, performing reaction under 60-150 DEG C for 30-420 minutes, and naturally cooling to obtain reactants; performing centrifugal processing and washing to obtain the inorganic perovskite CsPbX3 nanosheets. The method has the advantages that the method is simple to operate and does not need harsh experiment conditions, and the prepared nanosheets are uniform in size, high in controllability and high in yield, and the quantum efficiency of the nanosheets reaches up to 48%.

The invention discloses a method for acquiring lithium carbonate in zinnwaldite, which comprises the following steps: mixing zinnwaldite and a calcination agent, then roasting, using water for leaching to obtain a leachate, purifying the leachate and removing impurities, refrigerating and separating sodium out, concentrating, and adding sodium carbonate in a concentrate to obtain lithium carbonate precipitation and a solution containing potassium, rubidium and caesium. The method can increase the extraction rates of lithium, potassium, rubidium and caesium in zinnwaldite concentrate.

The object of the present invention is to provide a method for preparing a catalyst for producing methacrylic acid by subjecting methacrolein, isobutyl aldehyde or isobutyric acid to gas phase catalytic oxidation with high yield and high selectivity.

A method for preparing a catalyst for producing methacrylic acid by subjecting methacrolein, isobutyl aldehyde or isobutyric acid to gas phase catalytic oxidation, the method comprising: (a) a step of blending compounds each containing any one of Mo, V, P, Cu, Cs or NH₄ with water to prepare an aqueous solution or dispersion of the compounds (hereinafter referred to, both included, as a slurry); (b) a step of drying the slurry obtained in the step (a) to obtain a dried slurry; (c) a step of calcining the dried slurry obtained in..the step (b) to obtain a calcined body; (d) a step of filtering a mixture obtained by blending the calcined body obtained in the step (c) with water to separate an aqueous solution and water-insoluble matter; and (e) a step of drying the water-insoluble matter obtained in the step (d) to obtain a dried water-insoluble body.

The present invention relates to quaternary compound scintillators and related devices and methods. The scintillators may include, for example, a mixed halide scintillator composition including at least two different CsLiLa halide compounds and a dopant. Related detection devices and methods are further included.

The invention discloses a method for extracting lithium, rubidium and cesium in zinnwaldite. The method includes the following steps that S1, the zinnwaldite and a roasting addition agent are evenly mixed and pelletized, and thus raw ore pellets are obtained; the roasting addition agent is a compound addition agent which is composed of sulfate and/or calcium carbonate and/or calcium hydroxide and/or calcium oxide; S2, the raw ore pellets are roasted, so that clinker ore pellets are obtained; S3, the clinker ore pellets are ground, the ground clinker ore pellets are immersed by water, filtering is performed, and thus leach liquor is obtained; and S4, calcium oxide and/or calcium hydroxide are/is added into the leach liquor, performing is performed, and thus a purified solution containing water-soluble lithium salt, water-soluble rubidium salt and water-soluble cesium salt is obtained. According to the lithium extracting method, the compound roasting addition agent is creatively used, the extraction efficiency of alkali metal like the lithium, rubidium and cesium is improved, and cost is reduced.

The invention provides a caesium selective absorbent and a preparation method of the caesium selective absorbent and belongs to the fields of material preparation and radioactive liquid waste disposal. The caesium selective absorbent is in a sphere-similar particle shape and comprises the following components in parts by weight: 50-90 parts of an inorganic ion exchanging agent and 10-50 parts of polyacrylonitrile, wherein the inorganic ion exchanging agent has high selectivity to caesium. According to the sphere-similar caesium selective absorbent, the high selectivity of the inorganic ion exchanging agent to the caesium is remained, and the caesium selective absorbent is regular in shape and can be uniformly filled in a fixed bed due to the sphere-similar shape, so that the problem that a primary inorganic ion exchanging agent is not suitable for the operation of the fixed bed is solved, and the prepared absorbent can be used for processing radioactive liquid waste generated by nuclear industries and nuclear power stations through the fixed bed. The preparation method is unique and has the advantages of simplicity in operation, mild synthesis condition and the like; a granulating device utilized in the preparation method is simple, is easy to operate and is good in repeatability.

The invention discloses a method for synthetizing high-stability metal halide perovskite/lead sulfide heterostructure nanocrystals. The method comprises the following steps: firstly mixing lead halide with reactive solvent oleic acid, organic amine with long alkyl chains and octadecene in the presence of an inert gas so as to completely dissolve lead halide; then heating a mixed solution to 160-200 DEG C, rapidly injecting a caesium precursor, and reacting to generate CsPbX3; cooling to room temperature, then sequentially injecting a sulphur precursor and a lead precursor, and stirring for reaction, thereby finally obtaining the CsPbX3/PbS heterostructure nanocrystals. The synthetized CsPbX3/PbS heterostructure nanocrystals are uniform in appearance; the synthesis method is simple; due to epitaxial growth of lead sulfide, the perovskite performance stability is improved, and the CsPbX3/PbS heterostructure nanocrystals are enhanced in light-emitting efficiency and are beneficial to later-stage photoelectric device assembly.

The invention relates to a method for acquirement an image of a single atom and especially relates to a detection method capable of realizing direct acquirement of an image of a single atom. The detection method capable of realizing direct acquirement of an image of a single atom solves the problem that during single atom imaging, detection is difficult because of strong background signals. The detection method capable of realizing direct acquirement of an image of a single atom comprises the following steps that 1, a quadrate quartz-made glass vacuum room is treated; 2, a light field part and a magnetic field part of a magneto-optical trap system are constructed; 3, a far red-detuned micro-optical dipolar trap is constructed; 4, after an exciting light is superposed with one of three light beams which are orthogonal, fluorescent lights produced by caesium atoms are collected by a lens unit, are reflected to an interference filter by a polarization beam splitter and enter into multimode fibers; and 5, the fluorescent lights produced by caesium atoms are collected by an aspherical mirror and are reflected to a camera of a charge-coupled device by a total reflective mirror forming an angle of 45 degrees with the horizontal plane; and an image of a single atom is obtained by adjustment of an imaging zone of the camera of the charge-coupled device. The detection method provided bythe invention can realize direct acquirement of an image of a single atom and can be widely utilized for the fields of control and measurement of a single atom, and quantum information.

The invention discloses a heteropolyacid and oxide compound catalyst for preparing methacrylic acid through oxidation of methylacrolein. The preparation method of the catalyst comprises the following steps: mixing phosphomolybdic acid and metallic oxide (such as vanadium pentoxide, ferric oxide, cupric oxide, nickel oxide, manganese dioxide, cobaltous oxide, titanium dioxide and zinc oxide) in a liquid phase step by step so as to form relatively large amount of active sites on the surface of heteropolyanion; adding caesium to obtain the catalyst. The catalyst has high catalytic activity for preparing methacrylic acid through oxidation of methylacrolein and has a long catalyst service life.

The invention discloses a method for preparing bis(sulfonyl fluoride) imine and (perfluoroalkyl sulfonyl fluorine sulfonyl) imine alkali metal salt. According to the method, sulfamide is utilized to take reaction with thionyl chloride and chlorosulfonic acid for preparing bis(sulfonyl fluoride) imine or (perfluoroalkyl sulfonyl fluorine sulfonyl) imine, then, the bis(sulfonyl fluoride) imine or (perfluoroalkyl sulfonyl fluorine sulfonyl) imine takes reaction with antimony trifluoride and potassium (rubidium or caesium and the like) carbonate, and corresponding high-purity bis(sulfonyl fluoride) imine potassium (rubidium or caesium) salt or (perfluoroalkyl sulfonyl fluorine sulfonyl) imine potassium (rubidium or caesium) salt can be obtained; and the double decomposition exchange reaction of the potassium (rubidium or caesium) salt and lithium (or sodium) perchlorate or lithium (or sodium) tetrafluoroborate and the like in aprotic polar solvents is utilized to obtain corresponding high-purity lithium (or sodium) salt. The method provided by the invention has the characteristics that the operation step is simple, the products can be easily separated and purified, the purity and the yield are high, the environment pollution is avoided, the method is suitable for industrial mass production, and the like.

Compositions, kits, methods and systems for single molecule nucleotide sequencing comprising producing polymerase reactions having monovalent cations that control the median pulse width for incorporated nucleotides are disclosed. The levels of alkali metals such as lithium, sodium, potassium, rubidium, and cesium in the polymerization are used to control pulse width while allowing other sequencing parameters to remain within a desirable range.

The invention belongs to the technical field of metal oxide powder preparation and particularly relates to a solid-phase synthesis method for caesium tungsten bronze powder. The solid-phase synthesis method comprises the following steps of weighing a tungsten compound and cesium salt according to the W/Cs molar ratio (2-3.5):1, and mixing and grinding; placing the ground substance into a sealed vessel to react at the temperature of 750-800 DEG C for 1-2 hours; and ending the reaction to obtain the black blue caesium tungsten bronze powder with complete crystallinity, wherein the crystal phase comprises the component, namely Cs0.3WO3 or Cs0.32WO3. According to the solid-phase synthesis method, a solid raw material is adopted to directly react in a sealed vessel, inert gases or reducing gases are not needed to be introduced, and a gas generated by self-reaction is used as a protecting gas, so that the obtained powder is black blue, the air source is saved, and the cost is reduced; in addition, the synthesis process disclosed by the invention is simple, short in reaction period and suitable for industrial production.

The invention provides a preparation method of total-inorganic perovskite quantum dots, and relates to inorganic luminescent materials. The one-pot method is used, a precursor of a caesium source doesnot need to be prepared in advance, a required quantity of lead source and caesium source are dissolved in an organic solvent by using ligand, after vacuum drying, a halogen source is injected undera set temperature, at this moment, the three elements of Pb, Cs and halogen X can interact, and the CsPbX3 total-inorganic perovskite quantum dots are deposited. The three disadvantages of complex steps in the prior art are overcome that reagent sources are limited, wherein the reagents of the room temperature preparation method are caesium halide and lead halide, the reagents of the high temperature preparation method are caesium carbonate and lead halide, and it cannot be anything but the two substances to react; the amount ratio of the elements cannot be adjusted, that is, the amount ratioof Pb and halogen X is limited by a lead halide reactant; the precursor needs to be prepared and preheated in advance.

The invention discloses a method for controlling light wavelength of full-inorganic perovskite quantum dots. PbBr2 and octadecene are mixed and a mixed solution I is obtained; oleylamine and oleic acid are added to the mixed solution I in an inert environment, and a mixed solution II is obtained; the reaction temperature is increased to 120-160 DEG C, a caesium precursor solution is quickly added to the mixed solution II, the temperature is kept for 5 s, quantum dots are dispersed in a solvent, and a CsPbBr3 quantum dot solution is obtained; the CsPbBr3 quantum dot solution is dropped and applied to a silicon substrate cleaned in advance, and a film sample is formed; the film sample is placed in a vacuum device to be heated, and the light wavelength of full-inorganic perovskite quantum dots is controlled. The method is simple to operate, the size of the CsPbBr3 quantum dots can be changed after heat treatment, and the light wavelength is adjustable.