36 results about "Caesium hydroxide" patented technology

The invention provides preparation methods for a cesium tungsten bronze modified powder and slurry thereof, wherein the preparation methods of the cesium tungsten bronze modified powder include the steps that a cesium hydroxide and nano tungsten oxide solid solution is subjected to decomposition reduction by ammonia water under catalytic action of nano nickel oxide, and a cesium tungsten bronze powder is obtained; and in addition, the obtained cesium tungsten bronze powder has the powder surface modified by a coupling agent and infrared and ultraviolet absorbers to obtain a cesium tungsten bronze modified powder, the modified powder is dispersed in a PVB special-effect plasticizer 3G8 dispersant by a sand mill, and furthermore, the cesium tungsten bronze modified powder slurry is obtained.

The invention provides a method for synthesizing pollucite by means of an aluminosilicate polymer.The method comprises the steps that cesium hydroxide and sodium hydroxide are dissolved in silica sol with the mass concentration of 25%-45%, mechanical stirring is conducted, and a mixed alkali-activated solution of cesium silicate and sodium silicate is obtained; kaolin is put into an alumina crucible, the alumina crucible containing kaolin is put into a muffle furnace, the temperature is set to range from 500 DEG C to 900 DEG C, the heat preservation time ranges from 1.5 h to 2.5 h, and metakaolin powder is obtained; the mixed alkali-activated solution is put into an ice-water bath with the temperature ranging from 0 DEG C to 5 DEG C, the metakaolin powder is added, ultrasound treatment and mechanical stirring are conducted for 25 min-45 min, an aluminosilicate polymer slurry is obtained, deionized water is added to adjust the viscosity of the slurry to be 150 mPa.s-500 mPa.s when the shearing speed is 60 S<-1>-80 S<-1>, and the aluminosilicate polymer slurry is obtained; the obtained aluminosilicate polymer slurry is poured into a mold and cured for 3 h-24 h in a drying oven with the temperature ranging from 40 DEG C to 80 DEG C, and then pollucite is obtained.

The invention discloses a supported noble-metal hydrogenation catalyst, and a preparation method and an application of the catalyst. The catalyst is prepared according to the following steps: (1) preparing a mixed solution consisting of water, an alcohol and tetraethyl orthosilicate; (2) pouring activated carbon into the mixed solution obtained in the step (1) and performing stirring, then adding a soluble noble metal salt, regulating the pH value of the slurry to a range of 0.5-2.5, and performing stirring aging to obtain a reaction slurry; (3) adding a base liquor into the reaction slurry to regulate the pH value to a range of 7.5-14, wherein the basic substance in the base liquor is one or a combination of more selected from a group consisting of potassium hydroxide, cesium hydroxide, potassium acetate, cesium acetate, potassium carbonate and cesium carbonate, continuing to perform stir, and finally performing filtering and washing to obtain a catalyst precursor; and (4) performing reduction on the catalyst precursor to obtain the supported noble-metal hydrogenation catalyst. The invention provides an application of the catalyst in catalyzing hydrogenation synthesis of amino phenyl ether compounds which are represented as a formula II by using compounds which are represented as a formula II, the conversion rate reaches 100%, the selectivity can reach 99.5% or more, and the catalyst can be used for 50 times or more.

The invention relates to the technical field of a preparation method of cesium carbonate and in particular relates to a method for preparing cesium carbonate by an ion exchange method. The method is applicable to preparation of high-purity pollution-free cesium carbonate. The method comprises the following steps of: performing acid leaching, jarosite precipitation, recrystallization and conversion on pollucite to obtain a conversion solution of cesium sulfate; exchanging by using 201*7 strongly alkaline styrene anion exchange resin to obtain a cesium hydroxide solution; and introducing carbon dioxide into the cesium hydroxide solution and neutralizing to prepare a caesium bicarbonate solution; and concentrating, crystallizing, separating and drying to obtain the cesium carbonate finished product. The obtained product is high in purity, simple in process flow, economic and environment-friendly, and suitable for industrialized production; and the process adopting the anion exchange resin is simpler than the process adopting cation exchange resin and elution is avoided, so cesium loss in an eluting process is avoided, the system yield is increased, and the system yield after a mother liquid participates in circulation can reach 92 to 95 percent.

Chemical mechanical polishing compositions including an abrasive and cesium hydroxide and methods for polishing dielectric layers associated with integrated circuits using cesium hydroxide containing polishing compositions.

The invention relates to a preparation method of microcrystalline glass for treating radioactive cesium contaminated soil, which is characterized by comprising the following steps: (1) dissolving cesium hydroxide monohydrate in 20-40% silica sol according to the molar ratio of cesium metal ions to silicon atoms of 1: 2, and stirring for 12-24 hours to obtain a cesium silicate solution; (2) addingmetakaolin powder, controlling the molar ratio of silicon ions to aluminum ions to be 2: 1, stirring for 60-90min, pouring an obtained mixture into a mold, standing at 60-90 DEG C for 5-7 days to obtain a blocky solid, and grinding to obtain cesium-containing precursor powder; (3) mixing the following raw materials in percentage by weight: 50-65% of SiO2, 4-8% of Al2O3, 15-20% of B2O3, 15-25% of Na2CO3 and 8-10% of CaCO3, melting, forming, cooling to prepare glass, and grinding into glass powder; and (4) mixing the cesium-containing precursor powder and glass powder according to a mass ratio of 1: (4-5), melting at 1000-1200 DEG C for 2-5 hours, molding, and cooling. The preparation method has the beneficial effects of simple process, low melting temperature and easiness in process control; the chemical stability is good, the curing effect is obvious, and the leaching resistance rate is high.

The invention discloses a catalyst, application and a preparation method of trans-tranexamic acid. The catalyst is cesium hydroxide or cesium oxide. The cesium hydroxide or cesium oxide is used for catalyzing the conversion of cis-tranexamic acid to trans-tranexamic acid, so that the conversion rate of cis-tranexamic acid to trans-tranexamic acid is increased, the refining difficulty of tranexamic acid is reduced, the product yield is increased, and the production cost is reduced.

The invention relates to a method for preparing N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide (C.I. pigment red 179). A reaction is conducted on N-methyl-1,8-naphthalimide in a system composed of a mixed base composed of caesium hydroxide or hydrate thereof and DBU and polar aryl halide at 140 DEG C-190 DEG C, and N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide can be obtained. After pigment-based processing is conducted on N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide, the crystal form of N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic diimide is the same as that of a C.I. pigment red 179 product.

The invention discloses a catalyst for a hydrogen fuel cell. The catalyst is prepared from the following raw materials in parts by weight: 16-20 parts of iron oxide, 2-5 parts of caesium hydroxide, 135-140 parts of carbon black, 8-12 parts of chitosan oligosaccharide, 1-2 parts of ferric citrate, 0.4-0.8 part of trimethylol propane, 0.2-0.5 part of hexamethylenetetramine, 0.04-0.07 part of seconary alkane sulphonate sodium and 4-5 parts of urea. The invention also discloses a method for preparing a high-performance catalyst for the hydrogen fuel cell. The catalyst for the hydrogen fuel cell prepared by the scheme of the invention has better catalytic performance for the oxidation of hydrogen, since no precious metal platinum is used, the cost of the catalyst for the hydrogen fuel cell canbe reduced, and thus the cost of the hydrogen fuel cell can be reduced, and an important market value can be achieved.

The invention provides a high-temperature-resistant ceramizable cement-based material and a preparation method thereof. The cement-based material comprises the following components in percentage by weight: 60-75% of a precursor and an excitant, 10-20% of a reinforcing phase and 15-20% of an anti-shrinking agent, wherein the sum of the components is 100%. The high-temperature-resistant ceramizablecement-based material further comprises a water reducing agent accounting for 0.5-2% of the total mass of the precursor, the reinforcing phase, the excitant and the anti-shrinking agent, wherein the precursor is selected from a combination of two or more of metakaolin, slag or fly ash, and the excitant is selected from a combination of two or more of cesium hydroxide, cesium silicate and sodium hydroxide. The high-temperature-resistant ceramizable cement-based material has excellent workability after being mixed with water; the cement concrete has better mechanical properties and durability than common cement concrete after being hardened at normal temperature, can resist the high temperature of 1800 DEG C in case of fire or other high-temperature environments, and has the advantages of improved mechanical properties, hardness and thermal shock resistance, stable volume and no cracks or shrinkage.

The invention relates to the field of catalyst recycling in chemical industry, in particular to a recovery process of rhodium-containing waste catalyst solution. The process adopts strong base as precipitation reagent so that rhodium in the solution is separated from waste catalyst solution in precipitation form. The strong base is selected from any one of sodium hydroxide, potassium hydroxide and cesium hydroxide. The solution of the strong base is added to rhodium-containing waste catalyst solution and heating and stirring are carried out for 1-5h at the temperature of 80-100 DEG C so that a precipitation reaction occurs, namely, solid rhodium hydroxide can be obtained. The mol ratio of rhodium to strong base in the waste catalyst solution is 1: (6-12). By adopting the principle that the dissolution constant of rhodium hydroxide in water solution is extremely small, rhodium in the solution is separated from the waste catalyst solution in precipitation form; and the recycling method is efficient and quick, and the recovery rate of rhodium is more than 97%.

The invention discloses a catalyst for directly preparing isobutanol from synthesis gas. The composition of the catalyst is cesium tetrathiomolybdate. The preparation method of cesium tetrathiomolybdate comprises the following steps: respectively dissolving ammonium tetrathiomolybdate and cesium hydroxide in water, dropwisely adding an ammonium tetrathiomolybdate solution into the cesium hydroxidesolution, carrying out suction filtration on the obtained precipitate, and carrying out vacuum drying to obtain cesium tetrathiomolybdate. The obtained cesium tetrathiomolybdate can be used for preparing isobutanol from synthesis gas after being granulated. The catalyst provided by the invention has the advantages of simple preparation method, high total alcohol selectivity and high isobutanol content in total alcohol, is suitable for synthesis gas with a low H2/CO ratio, and has a good application prospect.

The invention discloses a supermolecule-based aqueous alkaline electrolyte with an ultra-wide working temperature range and an application thereof. The aqueous alkaline electrolyte is a solution formed by mixing a solute and a solvent, the solute is one or more than two of alkali metal hydroxides, and the alkali metal hydroxides are lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide or cesium hydroxide; and the solvent is a supramolecular solvent composed of water and dimethyl sulfoxide. The supermolecule-based aqueous alkaline electrolyte with the ultra-wide working temperature range has an extremely wide working temperature range of-70 DEG C to 100 DEG C, is relatively stable in performance, and can greatly improve the applicability of electrochemical energy storage devices such as supercapacitors and batteries based on the aqueous alkaline electrolyte in the all-day, all-season and extreme temperature fields.

The invention relates to a method for producing nano cesium tungstate powder and provides a preparation method of nano cesium tungstate powder which is free of washing, high in production efficiency and low in cost. According to the method, ammonium tungstate, ammonium paratungstate and ammonium metatungstate serve as tungsten sources, cesium hydroxide, cesium carbonate, cesium oxalate and cesium citrate serve as cesium sources, urea, PVP, PVA, oxalic acid and ammonium oxalate serve as dispersing agents, the materials are dissolved in water respectively and sequentially and evenly mixed with at least two of organic solvents containing alcohol, ether and ester functional groups, concentration and drying are conducted to obtain a powder substance, the powder substance is calcined to obtain blue powder, the blue powder is stirred in a high-pressure kettle under the hydrothermal condition at 120-250 DEG C, and then the blue powder is filtered, dried and smashed to obtain the blue nano cesium tungstate powder. The nano cesium tungstate powder produced through the method does not need to be washed, is hardly agglomerated and is easily dispersed into nano particles, production efficiency is high, the process is relatively safe and environmentally friendly, cost is low, and industrial production is convenient.