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 an anti-abrasion denitration catalyst and a preparation method thereof. The preparation method comprises the following steps of dissolving titanium source precursors into acid to form a solution; respectively dissolving molybdenum source precursors, phosphorus source precursors and magnesium source precursors to form solutions; uniformly mixing the solutions; regulating the pH value; performing precipitation, filtering and washing; then adding deionized water; preparing the materials into slurry; adding a vanadium source precursor solution; after uniform mixing, directly performing drying and roasting; grinding the materials into powder; next, adding extrusion auxiliary agents, a solution formed by the molybdenum source precursors and pore forming agents; adding water during the stirring to obtain paste; regulating the pH value; adding nanometer silicon dioxide, wollastonite, glass fiber and bonding agents; performing uniform mixing; extruding honeycomb-shaped blanks by an extruding machine; performing drying and roasting; then, obtaining a finished product. The prepared anti-abrasion denitration catalyst can overcome the defects of unstable activity, poor anti-abrasion performance and activity center unbalance of a denitration catalyst in flue gas in the prior art.

The invention discloses an antiwear honeycomb type denitration 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 molybdenum source precursor, a phosphorus source precursor and a magnesium source precursor are respectively dissolved to form solutions; the solutions are uniformly mixed; the pH value is regulated; precipitation and filtering are performed; then, deionized water and a vanadium source precursor solution are added; after being uniformly mixed, the mixture is directly dried, roasted and ground into powder; an extrusion aid and a solution formed by the molybdenum source precursor and a pore-forming agent are added into the powder; water is added while the stirring is performed until the paste shape is formed; then, nano-silicon dioxide, wollastonite, glass fiber and an adhesion agent are added and are uniformly mixed; a honeycomb type blank is extruded by an extruder; the dried blank is firstly put into a silicon source precursor solution to be soaked; after roasting, the finished product is obtained. The defects of active instability, poorer antiwear performance and unbalanced active center of the denitration catalyst in the flue gas in the prior art can be overcome.

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 present invention discloses a SO2 oxidation rate reducing honeycomb type vanadium-free flue gas denitration catalyst and a preparation method thereof. The preparation method comprises: dissolving a titanium source precursor in an acid to form a solution; dissolving a tungsten source precursor to form a solution; uniformly mixing the two solutions, adjusting the pH value to 7-12, precipitating, filtering, adding deionized water and a rare earth precursor solution, uniformly mixing, directly drying, roasting, and grinding to obtain powder; adding the solution formed from an extrusion aid and the tungsten source precursor and a pore forming agent to the powder, adding water while stirring to form a paste, adding nano-silica, glass fiber and a binder, uniformly mixing, and extruding a honeycomb type billet by using an extruder; and placing the dried billet into a silicon source precursor solution, impregnating, and roasting to obtain the finished product. According to the present invention, the defects of unbalanced activity center, poor molding property and unstable activity of the denitration catalyst in the flue gas in the prior art can be overcome.

The invention discloses a honeycomb type flue gas denitrification catalyst and a preparation method thereof. The preparation method comprises the following steps: dissolving a titanium source precursor into acid, so as to form a solution; respectively dissolving a tungsten source precursor so as to form a solution; uniformly mixing the two solutions, adjusting the pH value of a mixed solution, settling, washing, and filtering so as to obtain a filter cake; blending to form slurry, adding a vanadium source precursor solution, uniformly mixing, directly drying and roasting, and grinding into powder; adding an extruding aid, the phosphorus source precursor solution and a pore forming agent into the powder, adjusting the pH value to be alkaline, adding nano-silica, glass fibers and a bonding agent, uniformly mixing, and extruding a honeycomb type blank by virtue of an extruding machine; and drying and roasting, so as to obtain a finished product. The honeycomb type flue gas denitrification catalyst prepared by virtue of the preparation method is capable of resisting heavy metal deposition in flue gas and simultaneously has high catalytic performance and low sulfur dioxide / sulfur trioxide conversion rate.

The invention discloses a flue gas denitrification catalyst and a preparation method thereof. The catalyst has the specific surface area of 50-130 m<2> / g, has the pore volume of 0.30-0.70 cm<3> / g andis prepared from, in percentage by weight, 90%-97% of TiO2, 1%-10% of WO3 and 0.5%-5% of V2O5. The preparation method comprises steps as follows: (1) a titanium source precursor forms a solution; (2),a tungsten source precursor is dissolved and mixed with the solution obtained in the step (1); (3) the pH value of the solution obtained in the step (2) is adjusted, and precipitation, filtration andwashing are performed; (4) water is added to the filter cake obtained in the step (3), the filter cake is blended into slurry, a vanadium precursor solution is added, and the mixture is mixed, driedand roasted; (5) the solution formed by the tungsten source precursor is mixed with the powder obtained in the step (4) to form slurry, a pore-forming aid is added after the slurry is stirred, and thedenitrification catalyst is formed. The prepared denitrification catalyst can resist non-uniform deposition of vanadium oxide in flue gas on the surface, increase the specific surface area and the crushing strength of the catalyst, reduce the wear rate and improve the performance of the catalyst.

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.

The invention discloses a denitration catalyst with a wide temperature window and a preparation method of the denitration catalyst. The preparation method comprises the following steps: (1) a titaniumsource precursor is dissolved in acid, and a solution I is formed; (2) a molybdenum source precursor is dissolved to form a solution II, and the solution II is mixed with the solution I in step (1);(3) pH of the uniformly mixed solution obtained in step (2) is regulated to alkaline, precipitation, filtering and washing are performed, and a filter cake is obtained; (4) deionized water is added tothe filter cake obtained in step (3), the mixture is regulated into paste, a vanadium source precursor solution is added, the materials are uniformly mixed and directly dried and roasted, and powderis formed; (5) the molybdenum source precursor solution is mixed with the powder in step (4) into paste, the paste is stirred, a pore forming assistant is added, secondary stirring is performed, the mixture is sealed, left to stand, dried and roasted, and the denitration catalyst is formed. The prepared denitration catalyst has the advantages that vanadium oxide in flue gas can be prevented from non-uniformly depositing on the surface of the catalyst, and higher catalytic performance can be guaranteed in a wider reaction temperature range.

The invention discloses a preparation method of a honeycomb denitration catalyst with an improved specific surface area, and the preparation method comprises the following steps: (1) mixing and beating activated carbon and a sugar solution; (2) dissolving a titanium-source precursor; (3) dissolving a tungsten-source precursor, and mixing the tungsten-source precursor with the materials in the steps (1) and (2); (4) adjusting pH value of the mixed material in the step (3) to 8-13, precipitating, filtering and washing to obtain a filter cake; (5) regulating the filter cake in the step (4) to paste, adding a vanadium-source precursor solution, mixing, drying, under the protection of an inert gas baking to form powder; and (6) mixing a molybdenum-source precursor solution with the powder in the step (5) into paste, stirring, adding a pore forming agent, secondarily stirring, standing, extruding into a honeycomb shape, drying, coating surface with nano tungsten oxide, baking in an inert gas to obtain the catalyst. The specific surface area of the can be increased, uneven deposition of heavy metals on the catalyst in the flue gas can be resisted.

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 discloses a denitration catalyst and a preparation method thereof. The preparation method comprises steps as follows: (1) a titanium source precursor is dissolved to form a solution; (2), a tungsten source precursor is dissolved and mixed with the solution obtained in the step (1) uniformly; (3) the pH value of the solution obtained after uniform mixing in the step (2) is adjusted tobe alkaline, precipitation, filtration and washing are performed, and a filter cake is obtained; (4) deionized water is added to the filter cake obtained in the step (3), the filter cake is blended to be slurry, a vanadium precursor solution is added, the mixture is mixed uniformly and directly dried and roasted, and powder is formed; (5) the solution formed by the tungsten source precursor is mixed with the powder obtained in the step (4) to form slurry, a citric acid-sesbania powder compound is added after the slurry is stirred, secondary stirring is performed, the mixture is sealed, left to stand, dried and roasted, and the denitration catalyst is formed. The prepared denitration catalyst can resist non-uniform deposition of vanadium oxide in flue gas on the surface and improve the intensity, mesh micropores and performance of the catalyst.

The invention discloses a denitration catalyst for reducing the SO2 oxidation rate and a preparation method thereof. The preparation method comprises the following steps that (1) a titanium source precursor forms a solution; (2) a fluorine source precursor and an assistant catalysis ingredient precursor formed by one or two kinds of a tungsten source precursor and a molybdenum source precursor are dissolved to form a solution; the solutions are uniformly mixed; (3) the pH value is regulated to 7 to 12; precipitation, washing and filtering are performed; (4) the mixture is prepared into a slurry state by adding water; a vanadium source precursor solution is added; after mixing, drying and roasting are performed; the mixture is ground into powder; (5) powdery substances in the step (4) and one of the tungsten source precursor solution or a molybdenum source precursor solution are mixed into the slurry state; after stirring, a pore-forming agent is added; drying is performed after mixing; (6) drying products in the step (5) are soaked in a silicon source precursor solution, and are dried and roasted to form the denitration catalyst. The prepared denitration catalyst can overcome the defects of high SO2 oxidation rate and unbalanced active center of the denitration catalyst in flue gas in the prior art.

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:.

The invention discloses a flue gas denitrification catalyst and a preparation method thereof. The catalyst has the specific surface area of 50-160 m<2> / g and is prepared from, in percentage by weight,80%-92% of TiO2, 8%-15% of WO3 and 4%-10% of V2O5. The preparation method comprises steps as follows: (1) a titanium source precursor is dissolved to form a solution; (2), a tungsten source precursoris dissolved and mixed with the solution obtained in the step (1); (3) the pH value of the solution obtained in the step (2) is adjusted, and precipitation, filtration and washing are performed; (4)deionized water is added to the filter cake obtained in the step (3), the filter cake is blended into slurry, a vanadium precursor solution is added, and the mixture is mixed uniformly and directly dried and roasted; (5) the tungsten source precursor is mixed with the powder obtained in the step (4) to form slurry, sesbania powder is added after the slurry is stirred, secondary stirring is performed, the mixture is sealed, left to stand, dried and roasted, and the denitrification catalyst is formed. The prepared denitrification catalyst can resist non-uniform deposition of vanadium oxide in flue gas on the surface and improve the microporous structure and performance of the catalyst.

The invention discloses a honeycomb denitration catalyst capable of lowering the oxidation rate of SO2 and a preparation method thereof. The preparation method comprises the following steps: dissolving a titanium-source precursor in an acid to form a solution; separately dissolving a molybdenum-source precursor and a rare-earth precursor to form solutions; uniformly mixing the above solutions, adjusting the pH value of the mixed solution to 7 to 12, successively carrying out precipitation and filtering, then adding deionized water, carrying out blending to form slurry, adding a vanadium-source precursor solution, carrying out uniform mixing and then directly carrying out drying, roasting and grinding to obtain powder; adding an extrusion aid, the solution formed by the molybdenum-source precursor and a pore forming agent, adding water under stirring to obtain paste, then adding nanometer silica, glass fibers and a binder, carrying out uniform mixing and then carrying out extrusion with an extruder to obtain a honeycomb green body; and drying the honeycomb green body, dipping the honeycomb green body in a solution of a silicon-source precursor and carrying out roasting so as to obtain the finished honeycomb denitration catalyst. The honeycomb denitration catalyst provided by the invention can overcome the defects that conventional denitration catalysts have imbalanced active centers in flue gas, high oxidation rates of SO2 and instable activity.

The invention discloses a honeycomb denitration catalyst with increased specific surface area and a preparation method. The steps are as follows: (1) beating activated alumina; (2) dissolving titanium source precursor; (3) dissolving tungsten source precursor , and mix with the materials in steps (1) and (2); (4) Mix the materials in step (3) evenly and adjust the pH value to 8-13, precipitate, filter, and wash to obtain a filter cake; (5) Mix the materials in step (3) evenly to obtain a filter cake. 4) Add water to the obtained filter cake to make a slurry, add the vanadium source precursor solution, mix, dry and roast to form a powder; (6) Combine the solution formed by the molybdenum source precursor and the powder in step (5) Mix it into a slurry. After stirring, add a pore-forming agent. After stirring twice, let it stand and squeeze it into a honeycomb shape. After drying, the surface is coated with nanoscale tungsten oxide and roasted to obtain a denitration catalyst. The denitrification catalyst prepared by the invention can not only increase the specific surface area of ​​the catalyst, but also resist the uneven deposition of heavy metals in the flue gas on its surface.