34results about How to "Improve low temperature denitrification activity" patented technology

The invention provides a medium and low temperature denitration catalyst, and belongs to the technical field of denitration catalysts. The catalyst is prepared from ultrafine titanium dioxide, strontium-doped cerium manganese calcium titanium ore type composite oxides, vanadium pentoxide, tungsten trioxide, molybdenum trioxide and stannic oxide; glass fiber is used as an enhancing agent; carboxymethylcellulose and polyoxyethylene are used as bonding agents; stearic acid is used as a lubricating agent. The invention also relates to a preparation method of the medium and low temperature denitration catalyst. The concrete preparation method comprises the steps of preparation of the strontium-doped cerium manganese calcium titanium ore type composite oxides, preparation of carrier materials, preparation of powder catalysts, extrusion forming of honeycomb-shaped catalysts and post treatment of honeycomb-shaped denitration catalysts. The denitration catalyst prepared by the method has the advantages of high denitration efficiency, good sulfur-resistant and waterproof performance, reliable production process and the like in the wide temperature range from 180 DEG C to 350 DEG C; the requirements of oxynitride removal from industrial smoke gas in industries of coking, petrifaction, furnaces and the like can be met; wide application prospects are realized.

The invention discloses a low-temprature flue gas denitration and poisoning-prevention system. In an SCR (Selective Catalytic Reduction) denitration facility, a modified active carbon layer and a multilayered denitration catalyst are arranged along a flowing direction of flue gas in sequence; the modified active carbon layer is used for adsorbing water vapor, SO2, heavy metal and dust in flue gas through physical adsorption and chemical adsorption; the multilayered denitration catalyst is used for removing NOx in the flue gas; the denitration efficiency of a denitration catalyst is guaranteed so that the denitration rate of the denitration catalyst can be stabilized to be a relatively high numerical value; and the problem that a low-temperature catalyst is likely to cause poisoning is solved, active carbon can be cyclically used, byproducts can be utilized and the production cost is reduced.

The invention belongs to the technical fields of environmental protection and denitrification catalysis, and particularly relates to a flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst and a production method thereof. A carrier of the catalyst is titanium-cerium-zirconium compound nanotubes, an active component of the catalyst is vanadium pentoxide, and catalytic additives are ferric oxide, molybdenum trioxide and samarium sulphate. A two-step roll forming technology is adopted, and comprises the steps of firstly, loading the catalytic additives onto surfaces of the titanium-cerium-zirconium compound nanotubes by adopting an incipient-wetness impregnation method, then loading the active component of the catalyst onto surfaces of the carrier, and forming the catalyst into a flat plate through the roll forming technology to produce the flat-plate SCR denitrification catalyst with wide-temperature activity and performance of resistance to sulfur poisoning and alkali metal poisoning. The catalyst has excellent catalytic activity and performance of resistance to sulfur poisoning and alkali metal poisoning at a range of 150-450 DEG C, the problems of a narrow activity temperature range, sulfur poisoning, alkali metal poisoning and the like of a conventional catalyst in sulfur-containing alkali-metal-containing flue gas can be solved, andthe flat-plate wide-temperature sulfur-resistant alkali-metal-resistant SCR denitrification catalyst is suitable for wide-temperature denitrification of sulfur-containing alkali-metal-containing complex flue gas.

The invention discloses a monolithic honeycomb coated catalyst, and a preparation method and an application thereof. The monolithic honeycomb coated catalyst comprises a honeycomb catalyst carrier anda catalytic coating; the catalytic coating comprises a carrier I and an active component; the active component comprises an active metal element; the active metal element comprises at least one of V,W, Ce, Zr and La; and the carrier I comprises TiO2 and SiO2. The catalyst couples a denitration process and a dioxin removal process integrally, and is high in efficiency and low in cost, and the contribution of small-particle fly ash to dioxin can be remarkably reduced through the catalyst of an integral coating structure; and additionally, the high activity also effectively inhibits the generation of dioxin.

The embodiment of the invention provides a thin-wall flat plate type low-temperature sulfur-resistant SCR denitration catalyst and a preparation method thereof. The catalyst is prepared by taking TiO2-Nb2O5-Fe2O3 composite nano oxide as a carrier, V2O5 as an active component and MoO3 and MnSO4 as active aids, adding organic and inorganic structural aids, and performing multi-stage rolling, dryingand the like. According to the catalyst disclosed by the invention, the low-temperature denitration performance and sulfur poisoning resistance are improved by developing a carrier for accelerating denitration reaction, promoting decomposition of ammonium sulfate salt, optimizing active ingredients and active aids, optimizing forming aids, a preparation process and the like so that the catalyst has excellent denitration activity and stability within a temperature range of 150-250 DEG C. Due to the plate thickness of 0.35-0.40 mm, the catalyst has relatively low sulfur dioxide oxidation rate and relatively strong sulfur poisoning resistance, the raw material cost required by production is greatly reduced, and the operation cost of an SCR denitration system is saved.

The invention relates to a method for enhancing catalytic denitrification activity of a material by electron-beam irradiation modification and application thereof, belonging to the technical field of catalytic materials. The method comprises the following steps: by using titanium aluminum composite oxides as a support and palladium as an active component, adding the palladium by a polyethyleneglycol reduction process, and carrying out irradiation treatment on the catalyst obtained by reduction, thereby obtaining the irradiation-modified catalyst, wherein the titanium aluminum composite oxides are prepared by a sol-gel process. The catalyst is in the nanosheet structure by irradiation modification, thereby obviously widening the catalytic reaction temperature window, and enhancing the NOx removal property on the palladium catalyst. The preparation method is simple in technique and convenient to operate. The modified catalyst has favorable denitrification property and favorable application prospects.

The invention provides a nitrogen oxide removal catalyst based on a cobalt-lanthanum-niobium oxide nanocage. A catalyst carrier is flaky nano titanium dioxide, an active component is a cobalt-lanthanum-niobium hollow porous nano cage, and the final catalyst is prepared through prevulcanization treatment before the catalyst is used. The hollow nanocage of the cobalt-lanthanum-niobium composite oxide as an active component has good low-temperature catalytic activity, and the flaky nano titanium dioxide preferentially exposes (001) a high-activity crystal face, so that the activity of the catalyst is further improved; and the sulfur poisoning resistance of the catalyst can be remarkably improved after the catalyst is subjected to pre-vulcanization treatment. The catalyst provided by the invention has good denitration activity and sulfur poisoning resistance in a temperature range of 100-140 DEG C.

The invention discloses a preparation method of a denitration catalyst for a glass kiln. The preparation method specifically comprises the following steps: 1) adding oxalic acid, deionized water, ammonium metavanadate, ammonium heptamolybdate, cerous nitrate and cobalt nitrate into a reaction kettle, stirring until the materials are fully dissolved, then adding TiO2 and expanded vermiculite into amixed solution, carrying out hydrothermal reaction, drying and grinding to obtain catalyst precursor powder; 2) weighing the precursor powder, carboxymethyl cellulose, polyoxyethylene, basalt fiber,ammonia water, pulp cotton and stearic acid, adding deionized water, and performing pugging, aging and sintering to obtain the denitration catalyst for the glass kiln. The denitration catalyst provided by the invention has high wear resistance and alkali metal toxicity resistance, so that the denitration catalyst adapts to flue gas conditions of a glass kiln and achieves an optimal denitration effect.

The invention discloses a low-temperature denitration catalyst as well as a preparation method and application thereof. The low-temperature denitration catalyst is a Mn-Ce bimetallic oxide catalyst loaded by a FeVO4 nanorod carrier, wherein the molar ratio of Ce to Mn to FeVO4 is equal to (0.05-0.4):(0.1-0.5):1, and after the active components Mn and Ce are loaded on the FeVO4 nanorod, CeVO3 is generated on the surface of the FeVO4 nanorod. The catalyst disclosed by the invention is FeVO4 nanorod loaded Mn-Ce bimetallic oxide, the surface of a FeVO4 nanorod carrier has abundant acidic sites and excellent reducing capacity, and meanwhile, compared with V2O5, the FeVO4 nanorod carrier has relatively low toxicity and relatively high thermal stability.

The invention relates to a supported manganese based low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following specific steps: (1) dissolving cerate, ferric salt or cobalt salt and manganous salt into water to form a metal salt solution, adding a nonionic surfactant, a cosurfactant and an organic solvent into the metal salt solution, and stirring till the solution is clear, thereby obtaining a microemulsion, wherein the molar ratio of the water to the nonionic surfactant to the cosurfactant to the organic solvent is equal to 1:(0.03-0.6):(0.1-1.2):(1-5); (2) adding titanium sol into the microemulsion, stirring, and regulating the pH of the microemulsion to 8-11 by a pH regulator, and heating to obtain xerogel; and (3) grinding and calcining the xerogel to obtain the denitration catalyst. According to the preparation method, active components of the catalyst are uniformly dispersed in a whole supporter, TiO2, and thus are all deposited on the supporter. The denitration catalyst has a wide temperature range of low-temperature activity and high catalytic activity.

The embodiment of the invention provides a thin-wall flat plate type low-temperature sulfur-resistant SCR denitration catalyst and a preparation method thereof. The catalyst is prepared by taking TiO2-Nb2O5-Fe2O3 composite nano oxide as a carrier, V2O5 as an active component and MoO3 and MnSO4 as active aids, adding organic and inorganic structural aids, and performing multi-stage rolling, dryingand the like. According to the catalyst disclosed by the invention, the low-temperature denitration performance and sulfur poisoning resistance are improved by developing a carrier for accelerating denitration reaction, promoting decomposition of ammonium sulfate salt, optimizing active ingredients and active aids, optimizing forming aids, a preparation process and the like so that the catalyst has excellent denitration activity and stability within a temperature range of 150-250 DEG C. Due to the plate thickness of 0.35-0.40 mm, the catalyst has relatively low sulfur dioxide oxidation rate and relatively strong sulfur poisoning resistance, the raw material cost required by production is greatly reduced, and the operation cost of an SCR denitration system is saved.

The invention belongs to the technical field of industrial flue gas denitrification, and in particular relates to a low-temperature denitrification catalyst and a preparation method thereof. The low-temperature denitration catalyst is based on one or more of transition metal cerium, vanadium, and copper oxyhalides as active components, and one or more of tungsten, molybdenum, and iron metal oxides are used as auxiliary components. The catalyst is prepared by using one or more of titanium dioxide, diatomaceous earth and alumina as a carrier, through polarization, mixing, extrusion, drying and firing. The catalyst of the invention has the advantages of low-temperature denitrification activity (150-250° C.), resistance to sulfur dioxide and water poisoning, high stability, and high mechanical strength of the catalyst, and is suitable for the treatment of atmospheric pollutants in non-electric industries.

The invention discloses a copper-doped phosphomolybdic acid low-temperature denitrification catalyst and a preparation method thereof, belonging to the technical field of air pollution control. A copper-doped phosphomolybdic acid low-temperature denitrification catalyst of the present invention, the catalyst adopts anatase TiO 2 As a carrier, the active component is composed of phosphomolybdic acid, copper nitrate, polyethylene glycol (PEG) and cetyltrimethylammonium bromide (CTAB); the preparation process of the catalyst is: phosphomolybdic acid, nitric acid Put copper, surfactant CTAB and PEG into the crucible to dissolve, dry, dry, and calcinate to obtain the active component, and then mix the active component with TiO 2 Put them together into a crucible filled with distilled water, stir, dry, dry, and calcinate to obtain a copper-doped phosphomolybdic acid low-temperature denitrification catalyst. Using the copper-doped phosphomolybdic acid low-temperature denitrification catalyst of the present invention can enhance the catalyst’s resistance to SO on the basis of ensuring the low-temperature denitrification efficiency 2 and water vapor capacity.

The invention provides a preparation method of a modified TiO2 carrier loaded V-Mo denitration catalyst, and belongs to the technical field of low-temperature flue gas pollutant control. According to the catalyst, germanium-manganese modified TiO2 or germanium modified TiO2 is adopted as a carrier to load a vanadium-molybdenum composite oxide, while the crystal form of TiO2 is stabilized, the electron synergistic effect between the carrier and an active component is modulated, the active component is adsorbed by the carrier through an impregnation method, the mass ratio of V2O5 to the carrier in the obtained catalyst is 3%, and the mass ratio of V2O5 to the carrier is 5%. The mass ratio of MoO3 to the carrier is 6%. The denitration catalyst prepared by the invention has relatively high low-temperature denitration efficiency and relatively good sulfur resistance, is suitable for removal of nitrogen oxides in flue gas, and has the advantages of low temperature, high efficiency and high stability.

The invention belongs to the technical field of chemical industry, and is a preparation method of a low-temperature anti-sulfur denitrification catalyst. 2 The denitrification problem of flue gas, the catalyst of the present invention is doped iron modified TiO 2 Supported iron-manganese composite oxide catalyst, doped with iron and TiO 2 The molar ratio is 0.01:1~0.5:1, mixed by sol-gel method, and roasted in a reducing atmosphere to obtain a carrier, and the impregnation method is used to load 10% (mass ratio to the carrier, the same below) of Fe and 10 % Mn, the prepared denitration catalyst has a large specific surface area, high thermal stability, high denitration efficiency and good sulfur resistance, and is suitable for the catalyst containing a certain amount of SO 2 The field of nitrogen oxide removal in flue gas. The evaluation of simulated flue gas in the laboratory shows that when the air velocity is 30,000h ‑1 , NO 1000ppm and SO 2 Under the condition of 100ppm, in the range of 160~250℃, the removal rate of NO can reach more than 75%, and there is no SO 2 When it exists, the removal rate of NO at 160-250°C can reach more than 92%.

The invention provides a denitration catalyst and a preparation method thereof. The denitration catalyst comprises a carrier and active components, wherein the carrier is magnesia-alumina spinel modified with the first rare earth elements, and the active components comprise palladium oxide and iron oxide; in terms of the total weight of the denitration catalyst, palladium oxide accounts for 1wt%-8wt%, iron oxide accounts for 2wt%-5wt%, oxide of the first rare earth elements accounts for 5wt%-15wt%, magnesia accounts for 20wt%-40wt%, and alumina accounts for 18wt%-67wt% ; the first rare earth elements are one or more of lanthanum, cerium, praseodymium, samarium, europium, terbium and dysprosium. The denitration catalyst has quite high denitration capacity under the specific material composition and ratio, the NO conversion rate of the denitration catalyst can be as high as 92%, and the denitration catalyst can resist poisoning of SO2 at the high temperature and has good SO2 poisoning resistant capacity.

The invention discloses a honeycomb low-temperature denitration catalyst and a preparation technology thereof. The catalyst is prepared by a simple preparation technology and is easy to mould; in addition, the prepared catalyst is high in low-temperature activity and strong in resistance to water, sulfur and alkali (earth) metal poisoning; furthermore, a waste SCR catalyst is used as a raw material, so that the cost is low, resource utilization of the waste SCR catalyst can be achieved, and recycling of the waste SCR catalyst can be achieved.

The invention discloses a low-temperature denitration catalyst with strong anti-sulfur water-resistant properties and a preparation method thereof. Anatase type TiO2 is used as a carrier of the catalyst and is used for loading an active component, oxygen vanadium phosphate; the mole ratio of V to P in the active component, oxygen vanadium phosphate, is (1-6):1; the weight of the active component, oxygen vanadium phosphate, in the catalyst is 5%-15% of the total weight of the catalyst. According to the invention, the method comprises the following steps: with V2O5 as an active precursor, isobutyl alcohol as a reducing agent and benzyl alcohol as a solvent, performing reflux reaction at 150 DEG C, then adding phosphoric acid at proper ratio, and heating and refluxing; leaching, drying and calcinating the reaction mixture, thereby acquiring the active component, oxygen vanadium phosphate; lastly, adding the prepared active component, oxygen vanadium phosphate, and anatase type TiO2 with the specific surface area not below 250m<2> / g as the carrier into distilled water at proper ratio, stirring and mixing, and performing water bath drying and calcining, thereby acquiring the catalyst. The catalyst disclosed by the invention has higher low-temperature denitration activity and strong property for resisting against SO2 and water vapor toxifying.

The invention belongs to the field of environmental protection technology and denitration catalysis, and in particular relates to a flat plate type wide temperature anti-sulfur SCR denitration catalyst and a preparation method thereof. The carrier of the catalyst of the present invention is a hollow sphere of titanium-cerium composite oxide, the active component of the catalyst is vanadium pentoxide, and the catalyst assistants are ferric oxide, molybdenum trioxide and barium sulfate; a two-step roll forming process is adopted : First, the catalyst promoter is loaded on the surface of the titanium-cerium composite oxide hollow sphere by the equal volume impregnation method, and then the catalyst active component vanadium pentoxide is loaded on the surface of the carrier, and the catalyst is formed into a flat plate by a roll forming process. A flat-plate SCR denitration catalyst with wide temperature resistance to sulfur poisoning was obtained. The catalyst of the invention has good catalytic activity and anti-sulfur poisoning performance in the range of 150-450 DEG C, and can solve the problem that the catalyst has low activity in low-temperature flue gas, sulfur poisoning and SO in medium-temperature flue gas. 2 The problem of high oxidation rate is suitable for wide temperature sulfur-containing flue gas denitrification.

The present invention relates to the technical fields of chemical engineering and environmental protection, and provides a denitration catalyst, which includes a carrier and manganese oxide loaded on the carrier, and the carrier includes zirconia and graphene oxide; wherein, the molar ratio of manganese oxide to zirconia is 3.5-4.5:1, the ratio of the total mass of manganese oxide and zirconia to the mass of graphene oxide is 1000:2-7. Provided is a method for preparing a denitration catalyst, comprising: drying a manganese source, a zirconium source and graphene oxide after hydrothermal reaction, and roasting after drying. The above-mentioned denitration catalyst and the denitration catalyst prepared by the above-mentioned method are suitable for a wide working temperature, and exhibit high activity under low temperature conditions. The present invention also provides a denitration method. The denitration catalyst mentioned above or the denitration catalyst prepared by the preparation method is used in the denitration process. The method is suitable for a wide range of denitration temperatures and can exhibit high activity even at low temperatures.