86results about How to "Moderate surface area" patented technology

The invention discloses a preparation method of modified micron zero-valent iron and an application method of the modified micron zero-valent iron in remediation of heavy metal contaminated soil. The preparation method of the modified micron zero-valent iron comprises the steps of cleaning of iron raw materials, preparation of micro iron, ultrafine grinding and modifying treatment. A modifying agent composed of water, xanthan gum, sulfide, a stabilizing agent, zeolite and blast furnace slag is adopted in the step of modifying treatment. The preparation method of the modified micron zero-valent iron has the beneficial effects that the production process of the modified micron zero-valent iron is simple, and the effect similar or superior to micron zero-valent iron is achieved while the cost is reduced; and in addition, the reaction activity is controlled, the oxidation rate is decreased, excellent stability is obtained, and the acting time of the micron zero-valent iron is longer. By the adoption of the application method of the modified micron zero-valent iron, the remediation cost of heavy metal contaminated underground water is further reduced. According to the preparation method of the modified micron zero-valent iron and the application method of the modified micron zero-valent iron in remediation of heavy metal contaminated soil, organic fertilizer is added in the soil treatment process so that the fertility of soil can be improved, the structure of soil can be improved through humic acid produced by the organic fertilizer, heavy metal elements, such as lead, chromium and arsenic, in underground water can be removed, and the concentration of pollutants such as nitrate and perchlorate can be reduced.

The invention relates to a preparation method of a lithium iron phosphate material as a lithium ion battery positive electrode active substance. The preparation method comprises the following steps: dissolving a lithium source, an iron source and a phosphorus source in a reducing agent, adding a chelating agent, and uniformly stirring to form a mixed solution; performing a hydrothermal reaction; washing and drying to obtain lithium iron phosphate with a grade structure; and mixing with a carbon source, and calcining in a reducing atmosphere to obtain carbon-coated lithium iron phosphate with the grade structure. Compared with the prior art, the preparation method has the beneficial effects that the purity of the product is increased; the reducing agent has a reducing function, the chelating agent has a structure guiding function; the conductivity of lithium iron phosphate is enhanced, and the electrochemical property is improved; a resultant temperature interval is large, and a great application value and a bright development prospect are achieved; the specific capacity is high, the specific surface area is moderate, the cycle performance is good, the repeatability is high, the processing property is excellent, and the demand on a high energy storage device in practical production can be met.

The invention discloses nano ferric hydroxide and a preparation method thereof. The shape of nano ferric hydroxide is a nano-sheet cluster, wherein the cluster diameter of the nano-sheet cluster is between 400 and 500nm, and the sheet length of nano-sheets forming the nano-sheet cluster is between 200 and 250nm, and the sheet width is between 20 and 25nm, and the sheet thickness is between 2 and 5nm; the nano-sheet cluster is formed by orthorhombic system alpha-ferric hydroxide, and the specific surface area of the nitrogen adsorption and desorption representation is between 100 and 105m<2>/g. The method comprises the following steps of: mixing ethylene glycol and deionized water, and performing ultrasonic to prepare ethylene glycol aqueous solution; respectively adding ferrous sulfate into the ethylene glycol aqueous solution, and performing ultrasonic to obtain ferrous sulfate mixed solution; adding urea into ethylene glycol aqueous solution, and performing ultrasonic to obtain urea mixed solution; injecting the urea mixed solution into the stirring ferrous sulfate mixed solution at a speed of 0.8-1.2ml/min according to a volume ratio of (0.8-1.2):3 to prepare a reaction solution; and injecting air into the reaction solution at a speed of 2.5- 3.5ml/min to prepare the target product. The nano ferric hydroxide can be widely applied to adsorption and photocatalytic decomposition of organic matters.

The invention relates to a catalyst for preparing light olefins through Fischer-Tropsch synthesis as well as a preparation method and an application of the catalyst. The catalyst comprises a metal Mg-Al composite oxide as well as Fe, K and Mn metal elements loaded on the metal Mg-Al composite oxide, wherein the chemical general formula of the metal Mg-Al composite oxide is aMgO*bAl2O3, a and b represent mole fractions of MgO and Al2O3 in the metal Mg-Al composite oxide respectively, a is larger than 0 and smaller than 100, b is larger than 0 and smaller than 100, and the sum of a and b is 100; the chemical general formula of the catalyst is xFe*yK*zMn*(100-x-y-z)(aMgO*bAl2O3), x, y and z represent mass fractions of the Fe, K and Mn metal elements loaded in the catalyst respectively, x is larger than 0 and smaller than or equal to 20, y is larger than 0 and smaller than or equal to 3, and z is larger than 0 and smaller than or equal to 15. Compared with the prior art, the catalyst as well as the preparation method and the application thereof has the advantages that the preparation technology is simple, conditions are mild, the controllability is good, the raw material selection range is wide, the economic cost is low, and the prepared catalyst is good in activity, high in selectivity, good in reaction stability and applicable to preparation of the light olefins through industrial Fischer-Tropsch synthesis and has the bright application prospect.

The invention relates to diethylene glycol ammoniated morpholine catalyst and the process. Its character lies in: it uses gamma-Al2O3 or (gamma + theta)-Al2O3 as carrier, carrying at least two active components in Cu, Ni, CO. The manufacturing method is: the above mentioned carrier is baked under temperature of 700-800deg.C for 4-10 hours, acquires the preheated carrier, immersing at least two nitrite salt liquid with Cu, Ni, CO under 40-70deg.C, then they are dried after being filtered, baked under 400-600deg.C for 4 hours, then it is cooled to room temperature naturally. The DEG converting rate is 98.1-99.8mol%; the morpholine selectivity is 90.71-94.44mol%. The process is simple and the cost is low.

The present invention features that the high water absorption resin for sanitary material is prepared through polymerization with acrylic acid and hydroxyethyl acrylate as monomers, sodium hydroxide as neutralizing agent, cross-linking agent and initiator and inside water solution, and post-treatment with surface treating agent. The present invention has no pellet formed after absorbing water, high water absorption, high water absorbing speed, high water absorbed gel strength, high dry property, high air permeability and high water keeping performance without overflow of the absorbed water, even if in heating and pressurizing condition.

The invention discloses a water treatment compound agent for removing organic pollutants in an oxidation mode with high-activity singlet oxygen and a water treatment method of the water treatment compound agent, and relates to water treatment agents and methods for removing pollution in oxidation modes. The problems that when the singlet oxygen is produced through a photosensitization method, a light source needs to be added, secondary pollution is generated, and the use efficiency of the singlet oxygen in a chemical method is low are solved. The water treatment compound agent is composed of bleaching powder, inorganic solid peroxide and powdered activated carbon, and the mass ratio of the bleaching powder to the inorganic solid peroxide to the powdered activated carbon is (1-10):1(1-10). According to the water treatment compound agent, hypochlorite ions provided by the bleaching powder reacts with hydrogen peroxide slowly released after the peroxide is dissolved in water to generate the high-activity singlet oxygen, and through a micro-interface provided by the powdered activated carbon, the self-decomposition of the singlet oxygen can be restrained, the survival time of the singlet oxygen can be prolonged, and the use ratio of the singlet oxygen is improved. The water treatment compound agent is high in efficiency of removing the organic pollutants in the oxidation mode, cannot generate poisonous and harmful by-products, and is convenient to transport and store and more suitable for emergency treatment.

The invention relates to a bimetal-modified nano-HZSM-5 molecular sieve catalyst as well as a preparation method and application thereof. An HZSM- molecular sieve catalyst is taken as a carrier and isloaded with metal Zn and metal A, wherein the metal A is selected from any of Ga, Cd, Cu and La. By performing bimetal modification on the HZSM-5 molecular sieve catalyst, the bimetal modified nano-HZSM-5 molecular sieve catalyst which is more suitable for a methanol aromatization reaction is obtained; HZSM-5 is independently synthesized, compared with the prior art, the aspects of the formula ofraw materials, a synthesis method and a process are improved, and the HZSM-5 molecular sieve catalyst which is better than the existing HZSM-5 is obtained; the modified molecular sieve catalyst is moderate in specific surface area and is more suitable for the methanol aromatization reaction.

The invention relates to a metal modified nano HZSM-5 molecular sieve catalyst, a preparation method and the application thereof. The preparation method of the metal modified nano HZSM-5 molecular sieve catalyst is characterized by comprising the following steps: adding the HZSM-5 molecular sieve catalyst as a carrier into a modified metal compound solution to form a turbid material; carrying outa water bath reaction of the turbid material under stirring to obtain a sticky precursor material; and drying and roasting the precursor material to obtain the metal modified nano HZSM-5 molecular sieve catalyst finally. By modifying the metal HZSM-5 molecular sieve catalyst with a metal, the metal modified nano HZSM-5 molecular sieve catalyst more suitable for methanol aromatization reaction is obtained, so that the highest selectivity of the methanol aromatization reaction reaches up to 36.76%.

The invention discloses a preparation method of micron spherical silicon oxide. The method mainly comprises the following steps: pre-mixing silicon oxide powder and colloidal silica solution, adding acid, an additive, a dispersing agent and organic amine, sufficiently mixing the materials to form slurry, injecting the slurry into an oil column for molding through a fluidic generator with a certainaperture, and conducting aging, washing, drying and roasting to obtain the micron spherical silicon oxide particles. The micron spherical silicon oxide particles obtained by the method of the invention have mesoporous characteristics, aperture size controllable within 2-50 nm, specific surface area of 200-450 m<2>/g, pore volume of 0.5-1.5 ml/g, and grain size of 1-500 [mu]m. The micron sphericalsilicon oxide prepared by the method of the invention can be applied to the fields such as heterogeneous catalytic reaction, absorptive separation materials and liquid chromatographic fillers.

The invention discloses a spherical core-shell structure mixed graphite @ hard carbon composite material as well as a preparation method and an application thereof. The spherical core-shell structuremixed graphite @ hard carbon composite material has a core-shell structure; the core is formed by mixing microcrystalline graphite and flake graphite, and the shell is a hard carbon layer. The preparation method comprises the following steps of mixing the flake graphite and the microcrystalline graphite through ball milling, and dispersing with a carbohydrate carbon source and a surfactant into asolution system, wherein the obtained mixed solution is subjected to spray drying to obtain a precursor; and the precursor is placed in an inert atmosphere for heat treatment to obtain the composite material. The method is easily available in raw materials, simple in preparation process and high in repeatability; the prepared spherical core-shell structure mixed graphite @ hard carbon composite material has the advantages of rich active sites, large specific surface area, high conductivity and the like, and when the composite material is applied to a lithium ion battery negative electrode material, high specific capacity, high cycling stability and excellent rate performance are shown, and wide industrial application prospect is achieved.

The present invention provides a kind of preparation method of nano-calcium carbonate, comprises the following steps: (1) take out and weigh the quicklime obtained after the limestone is calcined at high temperature, digest the quicklime, and refine it into Ca( OH)2 slurry; (2) Prepare Ca(OH)2 raw slurry for refrigeration, add crystal form control agent to react, then add dispersant, carbonize with CO2, (3) thicken the cooked slurry after carbonization, add Activated by composite activator, dehydrated, dried, pulverized and classified to obtain 50-100nm nano-active calcium carbonate. By adopting the preparation method and surface modification method of nano-calcium carbonate of the present invention, the prepared nano-calcium carbonate has moderate specific surface area, regular crystal form, and good surface modification effect, which can greatly improve the excellent dispersion performance and ink absorption of calendered film products. performance, with very good market value.

The present invention relates to a catalyst for preparing vinyl acetate by using ethylene, acetic acid and oxygen gas or oxygen-containing gas as raw material and adopting gas-phase reaction. Its carrier is SiO2 or mixture of SiO2 and Al2O3, and the loaded active component contains Pd and KOAc, the active component is formed into egg-shell type non-uniform distribution, said catalyst is made into spherical granule, radium R of the sphere is 2-4 mm, and surrounding a central shaft of sphere, on the surface of the sphere 3-8 grooves whose cross-section is made into arched form are cut along the longitudinal direction, the groove is extended toward two ends of the central shaft from middle portion of the sphere and progressively exposed from surface of the sphere, and the distanced between grooves is greater than 1.5 mm. Said catalyst has high crushing strength, larger packing voidage and proper specific surface area.

The invention relates to a high-security long-life ternary material battery. Cathode size comprises the following solid matters by mass percent: 92.0-95.5% of ternary material, 3.0-7.0% of polyvinylidene fluoride and 1.5-2.5% of oily carbon nanofibers, and anode size comprises the following solid matters by mass percent: 90.0-93.5% of lithium titanate, 1.0-2.4% of sodium carboxymethylcellulose, 3.5-7.0% of a binding agent, 0.3-1.0% of SP type conductive carbon black, 0.5-1.8% of C45 type conductive carbon black and 1.2-2.4% of KS-6 type conductive carbon black. The high-security long-life ternary material battery provided by the invention is qualified in security, under room temperature condition, continuous charging and discharging is carried out according to 1C charge-discharge system, capacity retention ratio after 2000 cycles is higher than 80%, and operating requirements of a small electric tool, aviation, spaceflight and new energy automobiles can be met.

The invention provides an active material of the anode of a secondary battery, which has good capacity in both low load and high load; the active material of the anode is composed of multiple particles of a metal oxide which forms the body of the active material, a first conductive agent which covers the surfaces of all the particles of the metal oxide, and a second conductive agent which is between the particles of the metal oxide and the specific surface area thereof is less than the first conductive agent.

The invention discloses macroporous weak-base anion-exchange resin and a preparation method thereof. The macroporous weak-base anion-exchange resin comprises the following components: an oil phase anda water phase, wherein the oil phase is 60-80 parts of a 2-vinylpyridine monomer, 25-35 parts of a divinylbenzene cross-linking agent, 100-150% of polyurethane and modified hydroxymethyl cellulose asa mixed pore-foaming agent by monomer weight, and 1.5-3% of benzoyl peroxide and azodiisobutyronitrile as a mixed initiator by monomer weight; and the water phase is 480-600 parts of deionized water,2-3 parts of a hydroxypropyl methyl cellulose dispersing agent, and 38-42 parts of a sodium nitrite salting-out agent. The preparation method thereof comprises the following steps: adding the oil phase to the water phase, stirring, varying a temperature, and performing a curing reaction. The prepared macroporous weak-base anion-exchange resin has higher adsorptive selectivity, larger adsorptioncapacity and good heat resistance, and is capable of efficiently removing harmful or degradation-resistant anions of an arsenate ion, an aromatic sulfonate ion, a fumaric acid radical ion and the like, and prolonging service life thereof.

The invention discloses a method used for catalytic synthesis of fatty acid methyl ester with roasted hydrocalumite. According to the method, soybean oil and methanol are taken as raw materials, and synthesis of the fatty acid methyl ester is carried out under catalytic effect of roasted hydrocalumite. The structure general formula of the roasted hydrocalumite is Ca<2+><1-x>Al<3+><x>(OH)2(CO<3><2->)<x/2>.mH2O, wherein 0.3<=x<=0.35, m is used for representing the number of crystal water, and 1<=m<=3. The roasted hydrocalumite is a product of hydrocalumite after 2 to 8h of roasting at 400 to 800DEG C. The advantages are that: the catalyst preparation process is simple, cost is low, product yield is high, and catalyst separation is convenient.

The invention discloses a preparation method of a synthetic 1,4-butynediol catalyst. The preparation method comprises the following preparation steps of (1) preparing a copper and silicon mixed solution, a copper and bismuth mixed solution, a precipitant solution I and a precipitant solution II; (2) dripping the precipitant solution I into the copper and silicon mixed solution, so as to obtain copper and silicon precipitate slurry; (3) adding the copper and bismuth mixed solution into the copper and silicon precipitate slurry, wherein the usage amount of copper is the left copper amount; (4) compared with a precipitation condition in step (2), under the condition of lowering the reaction temperature by 5 to 30 DEG C, dripping the copper and bismuth mixed solution containing the copper and silicon precipitate into the precipitant solution II; (5) filtering a material, and adding a proper amount of distilled water; (6) spraying and drying the slurry, and calcining, so as to obtain the catalyst for producing synthetic 1,4-butynediol. The preparation method has the advantages that the particles of the catalyst are uniform, and the loss possibility in a use process is small; the preparation method of the catalyst is simple, the implementing is easy, and the repeatability is good.