47results about How to "Lots of lattice defects" patented technology

The invention relates to a corundum-spinelle lithical concreting material containing nano magnesium carbonate and a preparation method. In the method, the corundum-spinelle lithical concreting material containing nano magnesium carbonate is prepared by taking the currently and commonly used corundum-spinelle lithical concreting material as the base, adding nano magnesium carbonate powder, and adopting high efficient dispersant and proper mixing technique. With the method adopted, not only the adverse impact of magnesium oxide hydration on the concreting material workability caused by adding magnesia to generate spinelle in situ is avoided, but also the dreg resistance and thermal shock resistance of the existing corundum-spinelle lithical concreting material are improved. The corundum-spinelle lithical concreting material containing nano magnesium carbonate prepared by the invention can be widely used in high temperature industries such as steel, nonferrous metal, ceramic, petrochemical and the like, and can also be used for refractory material products such as air bricks which are baked after concreting moulding.

The invention relates to a nano dolomite-containing corundum spinel castable and a preparation method thereof. On the basis of a corundum spinel castable which is commonly used at present, nano dolomite powder is added, spinel and calcium hexa-aluminate serving as seed crystals are introduced, and a high-efficiency dispersing agent and an appropriate mixing process are adopted, so that the nano dolomite-containing corundum spinel castable is prepared. The adverse effect of hydration of magnesia on the construction performance of the castable when spinel is generated in situ by adding the magnesia is avoided, and the slag resistance and thermal shock resistance of the corundum spinel castable which is used at present are improved; and the prepared nano dolomite-containing corundum spinel castable can be widely applied to the field of high-temperature industry such as steel industry, nonferrous metal industry, ceramic industry and petrochemical industry, and also can be applied to a fireproof material product formed by casting, forming and sintering a permeable brick and the like.

The invention discloses a titanium dioxide/carbon nitride/Cu-ZSM-5 photocatalyst and a preparation method of the titanium dioxide/carbon nitride/Cu-ZSM-5 photocatalyst. The photocatalyst is prepared from the following components in parts by weight: 85-90 parts of catalyst carrier, 10-15 parts of sodium silicate, 5-10 parts of anatase phase titanium oxide, and 0.5-2.0 parts of graphite phase carbonnitride. The preparation method comprises the following steps: (1) washing and drying the catalyst carrier Cu-ZSM-5 for later use; (2) preparing a TiO2 precursor with tetrabutyl titanate as a titanium source; (3) mixing the prepared TiO2 precursor and Cu-ZSM-5 evenly and performing ultrasound treatment for 0.5-1h before drying; (4) mixing a dried product in step (3) with the graphite phase carbonnitride precursor evenly, and roasting by one-step roasting method. (5) soaking a roasted product in step (4) with a sodium silicate solution, pressing for molding, and drying to obtain a formed TiO2/g-C3N4/Cu-ZSM-5 photocatalyst. For the preparation method, a doped modified molecular sieve is used as a carrier, anatase phase titanium dioxide is supported by a sol-gel method, and graphite phase carbon nitride is doped, thereby improving photocatalytic desulfurization and denitration efficiency of the catalyst through the synergistic action of the two.

The invention discloses a cellular denitrification catalyst and a preparation method thereof. The catalyst preparation method comprises the following steps: dissolving a titanium source precursor in an acid to form a solution; respectively dissolving a molybdenum source precursor and a rare earth precursor to form solutions; uniformly mixing the above solutions, regulating the pH value to 7-12, and performing precipitation and filtration; then adding deionized water to form a pulp through blending; adding a vanadium source precursor solution, performing uniform mixing, and then directly performing drying, roasting and powder grinding; then adding an extrusion aid, the molybdenum source precursor solution and a pore forming agent into the powder, adding water with stirring to form a paste through blending, and regulating the pH value to alkaline; then adding nano silicon dioxide, glass fibers and an adhesive, and performing uniform mixing; and conducting extruding through an extruder to obtain a cellular blank, and performing drying and roasting to obtain the finished product. The cellular denitrification catalyst prepared by the preparation method disclosed by the invention can overcome the defects of the denitrification catalyst in the prior art, such as active center imbalance and unstable activity in flue gas.

The invention discloses a denitration catalyst with improved low-temperature activity and a preparation method of the denitration catalyst. The preparation method comprises the steps as follows: (1) dissolving a titanium source precursor in acid to form a solution; (2) forming solutions from a manganese source precursor, an iron source precursor and a tungsten source precursor, and uniformly mixing the solutions with the solution in the step (1); (3) regulating pH of the evenly mixed solution obtained in the step (2) to 7-12, and performing precipitation and filtration; (4) adding deionized water to a filter cake obtained in the step (3), blending the mixture into slurry, and adding a rare earth source precursor, performing dry and roasting after uniform mixing, and grinding the mixture into powder; (5) mixing the powder obtained in the step (4) and a tungsten source precursor solution into slurry, stirring the slurry, adding a pore-forming agent, uniformly mixing the mixture, and performing drying and roasting to form the denitration catalyst. The denitration catalyst for improving low-temperature activity and the preparation method of the denitration catalyst are designed to overcome the defects of imbalanced low-temperature activity center and instable activity of the denitration catalyst in flue gas in the prior art.

The invention discloses a denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving a titanium-source precursor in sulfuric acid so as to form a solution; (2) dissolving a tungsten-source precursor in water and adding the obtained solution into the solution obtained in the step (1); (3) subjecting a mixed solution obtained in the step (2) to ultrasonic oscillation, then adjusting the pH value of the mixed solution to more than 9.0 by using ammonia water and successively carrying out precipitation, filtering and washing; (4) adding deionized water into a filter cake obtained in the step (3) to obtain paste, adding a vanadium-source precursor solution and carrying out ultrasonic oscillation, and directly carrying out drying and roasting so as to obtain powder; and (5) mixing the powder obtained in the step (4) with an ammonium metatungstate solution so as to obtain paste, carrying out stirring, adding polyoxyethylene, then carrying out secondary stirring and successively carrying out hermetic standing, drying and roasting so as to obtain the denitration catalyst. The denitration catalyst prepared in the invention can prevent nonuniform deposition of vanadium oxide in flue gas on the surface of the denitration catalyst, ensures high catalyst performance and has stable catalysis performance.

The invention discloses a denitration catalyst for improving the specific surface area. A preparation method of the denitration catalyst comprises the following steps: firstly, beating activated aluminum oxide; secondly, dissolving a titanium source precursor; thirdly, dissolving a tungsten source precursor, and mixing the dissolved tungsten source precursor with solutions in the first step and the second step; fourthly, adjusting a pH value of the solution mixed in the third step to 8 to 13, and precipitating, filtering and washing to obtain a filter cake; fifthly, adding deionized water into the filter cake in the fourth step, mixing to form a pulpous state, adding a vanadium source precursor solution, uniformly mixing, and then drying and roasting to form a powdery substance; sixthly, mixing a solution formed by a molybdenum source precursor with the powdery substance in the fifth step to form the pulpous state; after stirring, adding a pore-forming agent; after secondary stirring, sealing, standing, drying and roasting to obtain the denitration catalyst. The denitration catalyst prepared by the preparation method disclosed by the invention has the advantages that the specific surface area of the catalyst can be increased, non-uniform deposition of heavy metal in flue gas on the surface of the catalyst can be resisted, and catalyst properties are improved.

The invention discloses a honeycomb-type vanadium-free denitrification catalyst for reducing the SO2 oxidation rate and a preparation method thereof. The preparation method comprises the following steps that a titanium source precursor is dissolved in acid to form a solution; a tungsten source precursor, a phosphorus source precursor and a magnesium source precursor are respectively dissolved to form a solution; the solutions are evenly mixed, a pH value is regulated to 7-12, precipitation and filtration are performed, then deionized water and a rare earth precursor solution are added, drying and calcination are performed directly after even mixing, and the mixture is grinded into powder; a solution prepared by an extrusion additive and the tungsten source precursor and a pore forming agent are added in the powder, water is added while stirring to form paste, then nano silica, glass fiber and a binder are added and are evenly mixed, and a honeycomb-type blank is extruded out by utilizing an extruding machine; the dried blank is firstly put in a silicon source precursor solution for impregnation, and a finished product is obtained after calcination. The prepared honeycomb-type vanadium-free denitrification catalyst overcomes the defects of active center imbalance and unstable activity of a denitrification catalyst in flue gas in the prior art.

The invention discloses a honeycomb denitration catalyst with increased specific surface area and a preparation method. The preparation method comprises steps as follows: (1) beating active alumina; (2) dissolving a titanium source precursor; (3) dissolving a tungsten source precursor and mixing the dissolved tungsten source precursor with the materials in the steps (1) and (2); (4) adjusting pH of the material evenly mixed in the step (3) to 8-13, and performing precipitation, filtering and washing to obtain a filter cake; (5) adding water to the filter cake obtained in the step (4), mixing the filter cake into a slurry state, adding a vanadium source precursor solution, and performing mixing, drying and roasting to form powder; (6) mixing a solution formed by a molybdenum source precursor with the powder in the step (5) into a slurry, stirring the mixture, adding a pore-forming agent, performing secondary stirring, allowing the mixture to stand, squeezing the mixture into a honeycomb shape, performing drying, and coating the surface with nano-tungsten oxide for roasting to obtain the denitration catalyst. The prepared denitration catalyst has the advantages that the specific surface area can be increased, and non-uniform deposition of heavy metals in flue gas on the surface of the catalyst is prevented.

The invention discloses a vanadium-free denitration catalyst and a preparation method thereof. The preparation method comprises steps as follows: (1) a titanium source precursor is formed into a solution; (2) an assistant catalysis component precursor containing one or two of a tungsten source precursor and a molybdenum source precursor are formed into a solution, and the solution is evenly mixed with the solution in the step (1); (3) the material obtained in the step (2) is mixed uniformly, pH of the solution is adjusted to 7-12, and precipitating and filtering are performed; (4) water is added to a filter cake obtained in the step (3), the solution is mixed into a slurry I, a rare earth source precursor solution is added, drying and roasting are performed after mixing, and the material is ground into powder; (5) the powder in the step (4) is mixed with one of the tungsten source precursor solution and the molybdenum source precursor solution, a slurry II is formed and stirred, a pore-forming agent is added, the mixture is mixed, dried and roasted, and the denitration catalyst is formed. The prepared denitration catalyst can overcome the defects that the denitration catalyst in the prior art is uneven in activity center in flue gas and unstable in activity.

The invention discloses a denitration catalyst with resistance to heavy metal deposition and a preparation method of the denitration catalyst. The denitration catalyst with the specific surface area being 40-120 m<2>/g contains 80%-98% by weight of titanium dioxide, 1%-15% by weight of molybdenum trioxide and 0.3%-5% by weight of vanadium pentoxide. The preparation method comprises the following steps: (1) a titanium source precursor is dissolved in acid; (2) a molybdenum source precursor is dissolved and mixed with the solution in step (1); (3) pH of the solution obtained in step (2) is regulated, and the solution is filtered; (4) sesbania powder and deionized water are added to a filter cake obtained in step (3), a vanadium source precursor solution is added, and the mixed solution is roasted; (5) the molybdenum source precursor solution is mixed with powder in step (4), the sesbania powder is added, the mixture is sealed, left to stand and roasted, and the denitration catalyst is formed. The prepared denitration catalyst has the advantages that heavy-metal oxide in flue gas can be prevented from depositing on the surface of the catalyst, adding quantity of active components in the catalyst can be reduced, and preparation cost of the catalyst is reduced.

The invention relates to a novel lithium ion secondary battery positive electrode material--NbOx (wherein x is equal to 1 to 2). A lithium ion secondary battery with the positive electrode material containing the active substance NbOx and a negative electrode prepared from a lithium sheet is characterized in that charge and discharge voltage platforms of the lithium ion secondary battery are 1.8 v and 1.6 V, respectively, and the lithium ion secondary battery has good charge-discharge cycle performance, environment friendliness, no pollution, etc. NbOx (wherein x is equal to 1 to 2) is a novel lithium ion battery positive electrode material with application prospects, high capacity and high safety.

The invention discloses a vanadium-free denitration catalyst for reducing SO2 oxidization rate and a preparation method thereof. The preparation method comprises the following steps of: (1) dissolving a titanium source precursor into an acid to form a solution; (2) dissolving a rare earth precursor and a co-catalytic component precursor formed by one or two of a tungsten source precursor and a molybdenum source precursor to form a solution and uniformly mixing the solution with the solution in the step (1); (3) adjusting the pH value of the solution which is uniformly mixed in the step (2) to 7-12, and precipitating, filtering, washing, drying and the roasting the solution, and grinding the precipitate to powder; (4) mixing the powder in the step (3) with one of the tungsten source precursor solution or the molybdenum source precursor solution to slurry, stirring the mixture, adding a pore forming material, and uniformly mixing the mixture and drying the same; and (5) immersing the dried product in the step (4) in a silicon source precursor solution, and then drying and roasting the mixture to form the denitration catalyst. The vanadium-free denitration catalyst disclosed by the invention can overcome the defects that in the prior art, the active centre of the denitration catalyst in flue gas is unbalanced and the activity is unstable.

A preparation method of a honeycomb flue gas denitrification catalyst capable of reducing activation temperature and SO2 oxidation rate comprises the following steps: dissolving a titanium source precursor into acid to form a solution; dissolving a molybdenum source precursor and a phosphorus source precursor to form solutions; uniformly mixing the solutions, adjusting the pH value to 7-12, precipitating, filtering, then adding deionized water, a vanadium source precursor solution, uniformly mixing, directly drying, roasting, and grinding into powder; adding an extrusion aid, the solution formed by the molybdenum source precursor and a pore-forming agent into the powder, adding water while stirring, blending into a paste, then adding nanometer silicon dioxide, glass fiber and a bonding agent, uniformly mixing, extruding into a honeycomb blank by using an extruder, impregnating the dried blank into a silicon source precursor solution, and roasting to obtain a finished product. The invention aims to overcome the defects that in the prior art, the denitrification catalyst is unbalanced in active centers in flue gas, high in SO2 oxidation rate and poor in poisoning resistance.

The invention discloses a denitration catalyst improving a specific surface area and a preparation method thereof. The preparation method comprises the following steps: (1) mixing activated carbon with a saccharide solution and then pulping; (2) dissolving titanium source precursor; (3) dissolving tungsten source precursor, mixing the tungsten source precursor with the liquid of step (1) and step (2) evenly; (3) adjusting the pH value of the materials of the step (3) to be 8 to 13, precipitating, filtering and washing to obtain a filter cake; (5) adding deionized water into the filter cake obtained in the step (4), adjusting into a pasty form, adding a vanadium source precursor solution, mixing uniformly and drying, and conducting calcination under the protection of inert gas to form a powder material; (6) mixing the tungsten source precursor formed solution with the powder material of step (5) to form a pasty form, adding pore-forming agents to mix, sealing, standing and drying, and conducting calcination in an inert gas atmosphere to obtain the denitration catalyst. According to the invention of the denitration catalyst improving the specific surface area and the preparation method thereof, the specific surface area of the catalyst is improved, the non-uniform deposition of the heavy metal in the flue gas is avoided and the catalyst performance is improved.

The invention discloses a denitration catalyst with resistance to sulfur dioxide oxidation and a preparation method of the denitration catalyst. The denitration catalyst contains 80%-98% by weight oftitanium dioxide, 1%-10% by weight of molybdenum trioxide, 0.3%-5% by weight of vanadium pentoxide and 0.1%-5% by weight of silicon dioxide. The preparation method comprises the following steps: (1) asolution I is formed from a titanium source precursor; (2) a solution II is formed from a molybdenum source precursor and mixed with the solution I in step (1); (3) pH of the solution obtained in step (2) is regulated, and the solution is filtered; (4) deionized water is added to a filter cake obtained in step (3), a vanadium source precursor solution is added, and the mixed solution is subjectedto mixed drying and roasting; (5) the molybdenum source precursor solution is mixed with powder in step (4), a pore-forming additive is added, and the mixture is dried; (6) a dried product in step (5) is dipped in a silicon source precursor solution and roasted. The prepared denitration catalyst has the advantages that vanadium oxide in flue gas can be prevented from non-uniform deposition on thesurface of the catalyst, high catalytic performance is guaranteed, and low sulfur dioxide/sulfur trioxide conversion rate is realized.

The invention discloses a denitration catalyst with a low SO2/SO3 conversion rate and a preparation method of the denitration catalyst. The catalyst has a specific surface area of 40-120 m<2>/g and contains TiO2, WO3, V2O5 and SiO. The preparation method comprises the following steps: (1), forming a solution from a Ti source precursor; (2), forming a solution from a W source precursor, and mixingthe solution with the solution in (1); (3), adjusting pH of the solution obtained in (2) to be alkaline and performing precipitating; (4), adding water to filter cakes obtained in (3) to form slurry,adding a V source precursor solution, and performing drying and roasting to form powder; (5), mixing the W source precursor solution with the powder in (4) to form slurry, performing stirring, and adding a pore-forming aid for seal standing and drying; (6), immersing the dried product in (5) in a Si source precursor solution, and performing drying and roasting. The prepared denitration catalyst not only can resist uneven deposition of V oxide on the surface of flue gas, but also can ensure high catalyst performance and has low SO2/SO3 conversion rate.

The invention relates to submicron tungsten oxide-based powder and a preparation method and an application thereof. The total mass fraction of doped source elements in mixed powder is 5-50%, the dopedsource elements are selected from at least three of Ti, Mo, V, Al, Li and Zr, the purity of the mixed powder is larger than 99.95%, the average particle size is 500 nm-1800 nm, and the D50 particle size is 200-750 nm; wherein M1 is defined as the mass fraction of powder particles with the particle size of 50-100 nm, M2 is defined as the mass fraction of powder particles with the particle size of100-400 nm, M3 is defined as the mass fraction of powder particles with the particle size of 400-700 nm, M4 is defined as the mass fraction of powder particles with the particle size of 700 nm and 1 micron, M5 is defined as the mass fraction of powder particles with the particle size of more than 1 micron; then the quantitative relationship of M1, M2, M3, M4, and M5 conforms to the formula in thespecification:.