30results about How to "Good low temperature denitrification activity" patented technology

The invention belongs to the field of the preparation of catalysts for stationary source tail gas denitration, and relates to the preparation of a catalyst by using a honeycomb metal carrier. Tabular and corrugated wire meshes attached with aluminum oxide coatings are stacked alternately and fixedly molded to form a catalyst carrier; a passage inside the carrier has a three-dimensional transparent structure. The preparation is characterized in that: the catalyst is prepared by loading the active components V2O5, WO3 and TiO2 on the surface of the catalyst carrier by a stepwise loading method; the mass sum of the V2O5, the WO3 and the TiO2 is 10-70 percent of the total weight of the aluminum oxide coatings and the V2O5, the WO3 and the TiO2; and the mass of V elements is 0.2-5.6 percent of the mass sum of the V2O5, the WO3 and the TiO2. The catalyst of the invention has low-temperature denitration activity and low-temperature sulfur and water resistant performance; and when the smoke temperature is 250 DEG C, the SO2 concentration is 600 ppm and the moisture content is 10%, the denitration efficiency of the catalyst is above 90%.

The invention relates to supported iron-based composite oxide catalyst and a preparation method thereof. The catalyst is made of titanium oxide or aluminum oxide serving as a carrier, iron and cerium serving as a host, and optional one or a plurality of transition metals such as tungsten, molybdenum, titanium and zirconium serving as axillaries. The mole ratio of the iron to the cerium is 1.0-10.0:1. The mole ratio of the host to the auxiliaries is 1.0-5.0:1. The mole ratio of the total of the host and auxiliaries to the carrier is 0.1-0.5:1. The preparation method includes: preparing the auxiliaries and the host into solution, soaking the carrier in the solution, dropwise adding precipitant for precipitation, filtering, drying and calcining. The catalyst has wide denitration temperature window and fine low-temperature denitration activity.

The invention relates to a catalyst and a preparation method thereof, in particular to a flue gas denitration catalyst applied at a low temperature and a preparation method thereof. TiO2 doped with one or multiple of Al2O3, SiO2 or ZrO2 is taken as a carrier, glass fiber is taken as a skeleton, and vanadium compounded with one or multiple of tungsten, molybdenum, cerium, manganese, niobium or phosphorus is taken as an active component. The flue gas denitration catalyst comprises the carrier, active precursor aqueous solution, glass fiber, stearic acid, lactic acid, wood pulp, monoethanolamine, polyoxyethylene, methylcellulose, ammonia water and water. The catalyst has good low-temperature denitration activity; and within the temperature of 150-300 DEG C, denitration efficiency of the catalyst is up to 85% or above. The catalyst has high sulfur-poisoning resistance and water-poisoning resistance capacity, and long-term use of the catalyst at a low temperature is guaranteed. Further, the catalyst can be applied to fields such as glass production, coking, cement, industrial kilns, waste incineration and chemical engineering widely. The invention further provides a preparation method of the catalyst, which is reasonable in processing.

The invention relates to a denitration treatment method of flue gas discharged by an ethylene cracking furnace. The flue gas sequentially flows a radiation section, a convection heat exchange sectionA, an ammonia injection grid, a convection heat exchange section B, an SCR denitration reaction section and a convection heat exchange section C, and the SCR denitration reaction section is filled with a catalyst. A preparation method of the catalyst includes the steps: (1) adding carbon black powder and cerium nitrate into silicon-containing ethanol solution, uniformly mixing materials under thecondition of ultrasonic dispersion, separating solid and liquid, and drying a solid phase to obtain silicon and cerium modified carbon black powder; (2) adding the modified carbon black powder in titanium-containing ethanol solution, adding dilute nitric acid solution to form sol-gel, treating the sol-gel at high temperature in anaerobic atmosphere, and calcining the treated sol-gel in oxygen containing atmosphere to obtain a silicon-cerium-containing macro-porous titanium dioxide carrier; (3) mixing the titanium dioxide carrier, a molecular sieve and an active component precursor to form a honeycomb denitration catalyst. The method is good in denitration activity and high in water-vapor-resistant capability, and the catalyst cannot be easily cracked and long in service life.

The invention provides a preparation method of an iron or copper oxide pillared layered manganese oxide low-temperature denitration catalyst. The method mainly uses a shared precursor method. Throughhydroxide preparation, hydroxide oxidization, suction filtration and washing, drying and roasting preparation, the iron or copper oxide pillared layered manganese oxide low-temperature denitration catalyst is obtained. The low-temperature denitration catalyst has the advantages that the active temperature window is low; the denitration efficiency is high; the method is applicable to the SCR (selective catalytic reduction) method low-temperature denitration technology.

The invention relates to a low-temperature denitration catalyst and a preparation method and application thereof, and the method comprises the following steps: (1) dissolving manganese nitrate, ceriumnitrate and fuel in deionized water to obtain a mixed solution; (2) adding titanium dioxide into the mixed solution, and uniformly stirring to obtain a product; and (3) placing the obtained product in a pre-preheated combustion chamber for rapid combustion, then continuously roasting for a certain time, and finally grinding to obtain the Mn-Ce-Ox/TiO2 low-temperature denitration catalyst which isused for NH3-SCR reaction. Compared with the prior art, the preparation method has the advantages that the operation is simple, the prepared catalyst is porous and fluffy, the low-temperature denitration activity is better, the reaction temperature window is wider, the water resistance and sulfur resistance are better, and the like.

The invention discloses preparation and low-temperature denitration application of a Mn-Ce-Sb/hierarchical porous ZSM-5 catalyst, wherein a hierarchical porous ZSM-5 molecular sieve is prepared by a soft template method, and Mn, Ce and Sb are loaded by an impregnation method to synthesize the Mn-Ce-Sb/hierarchical porous ZSM-5 catalyst so as to improve the low-temperature denitration performance and the sulfur resistance of the Mn-Ce-Sb/hierarchical porous ZSM-5 catalyst. The hierarchical porous ZSM-5 molecular sieve has a developed porous structure, combines adjustable acidity and good hydrothermal stability of a microporous molecular sieve and excellent mass transfer and diffusion performance of a mesoporous material, is simple to prepare and has good repeatability. The hierarchical porous ZSM-5 molecular sieve catalyst prepared by the method shows good low-temperature denitration performance and sulfur resistance.

The invention discloses a sweet dumpling forming sulfur-resistant low-temperature denitration catalyst as well as a preparation method and application thereof. The denitration catalyst comprises a molecular sieve and a protective shell, the molecular sieve is wrapped by the protective shell; the molecular sieve is loaded with an active component; the protective shell contains titanium oxide; and the protective shell has a porous structure. The protective shell can be flexibly adjusted according to the content of sulfur and water under different working conditions. The denitration catalyst hasthe characteristics of sulfur resistance and water resistance, has a pore structure, reduces pressure drop, enables reaction gas to be more easily close to a catalytic center, is used for denitrationof fixed source flue gas, has the advantages of excellent low-temperature activity and sulfur poisoning resistance, and can be repeatedly used through regeneration.

The invention discloses a high-strength manganese oxide granular catalyst, which is characterized by comprising the following raw material components by weight: 50-70% of manganese carbonate, 10-30% of clay, 10-20% of an inorganic binder, 1-5% of an organic binder and 3-10% of inorganic fiber. The invention also discloses a preparation process of the high-strength manganese oxide particle catalyst. The process comprises the following steps: selecting a manganese carbonate precursor with special composition requirements, mixing the manganese carbonate precursor with high-surface-area clay, an inorganic binder and water to form a mixture, adding glass fiber and an organic binder into a kneading machine, and carrying out strong kneading to obtain corresponding manganese carbonate pug; and in a two-stage vacuum extruder, carrying out vacuum extrusion and cutting to obtain green body pug particles, and drying and roasting to obtain manganese oxide catalyst particles. The catalyst provided by the invention has excellent denitration efficiency.

The invention discloses a denitration catalyst. The denitration catalyst comprises a molecular sieve and a protective layer, the protective layer is coated on the surface of the molecular sieve; the molecular sieve is loaded with an active component; and the protective layer contains a SiOx-TiOx crystal substance. The invention further discloses a preparation method of the denitration catalyst and application of the denitration catalyst in denitration of waste gas containing water and/or sulfur. The denitration catalyst has good low-temperature denitration activity (lt; and the Ti content of the SiOx-TiOx crystal substance protective layer is increased in a gradient manner, so that the water resistance and sulfur resistance of the denitration catalyst are greatly improved, and the denitration catalyst can be reused through regeneration.

The invention discloses an efficient response optical coupling denitration catalyst and a preparation method thereof, and belongs to the technical field of blast furnace slag application. The preparation method of the product comprises the following steps: uniformly mixing the titanium-containing blast furnace slag with the rare earth element oxide, the transition metal oxide and a certain amount of sodium hydroxide, heating to melt, reconfiguring a silicate phase while solid-dissolving transition group elements into a perovskite phase, and stripping the silicate phase through acid leaching treatment, thereby finally obtaining the perovskite-based functional material. The obtained product is the optical coupling low-temperature denitration catalyst with efficient response activity. According to the catalyst prepared by the method disclosed by the invention, the removal rate of NOx can reach 100% and the N2 selectivity can reach 92% under a low-temperature condition (140 DEG C) in a manner of adding a light source, so that the denitration catalyst capable of efficiently responding under the low-temperature condition is prepared at low cost in a short process; and the method disclosed by the invention has great significance in high-added-value application of the titanium-containing blast furnace slag and continuous and efficient removal of NOx in industrial waste gas.

The invention discloses a modified low-temperature SCO denitration catalyst and a preparation method thereof. The preparation method comprises: (1) dissolving manganese nitrate, cobalt nitrate and cerium nitrate in dimethylformamide, adding an organic ligand, and ultrasonicating until the solution is evenly mixed; (2) heating the mixed solution obtained in step (1), Hydrothermal reaction to obtain Mn/Co/Ce mixed multi-metal organic framework crystal material; the prepared crystal material is washed, filtered, dried and roasted in sequence to obtain low-temperature SCO denitration catalyst; (3) Ultrasonic impregnation of low-temperature SCO with modified solution The denitration catalyst is taken out and dried to obtain the modified low-temperature SCO denitration catalyst. The modified low-temperature SCO denitrification catalyst of the present invention has a NO conversion rate of 62.41% at 100°C. Compared with the SCO denitrification catalyst before modification, the activity has increased by 40.05%, which can better meet the current industrial requirements. The field of low-temperature denitrification has great potential application prospects.

The invention discloses a monatomic Ir denitration catalyst based on TiO2 mesocrystals in the technical field of denitration catalyst preparation. A carrier of the catalyst is mesocrystal TiO2-MC, theactive component is a single-atom Ir metal, and the molar ratio of Ir/TiO2 to MC is 0.02 to 0.08. TiO2-MC is used as a carrier, the modification effect of dopamine hydrochloride or levodopa is utilized, and a redox reaction between Ir<4+> and NH2<-> is combined. According to the TiO2 mesocrystal-based monatomic Ir denitration catalyst and a preparation method thereof, TiO2-MC is used as a carrier, the modification effect of dopamine hydrochloride or levodopa is utilized, the redox reaction between Ir<4+> and NH2<-> is combined, a secondary functionalized platform is obtained on the TiO2 mesocrystal, and by combining the redox effect of Ir<4+> and NH2<-> groups on chloroiridic acid, the catalyst provides good low temperature denitration activity at a temperature of 180-300 DEG C, and the preparation method is mild, safe and environmentally friendly.

The invention discloses a copper-iron molecular sieve based catalyst as well as a preparation method and application thereof, and belongs to the technical field of denitration catalysis in environmental protection. According to the catalyst, MCM-22 and ZSM-5 are used as carriers, and loaded metals Cu and Fe are used as active components, the content of Cu accounts for 1.5-5.0% of the total weight of the copper-iron molecular sieve-based catalyst, the content of Fe accounts for 1.5-5.0% of the total weight of the copper-iron molecular sieve-based catalyst, the general formula of the copper-iron molecular sieve-based catalyst is xCu/yFe-MCM-22/ZSM-5, wherein x is the mass percentage content of the metal Cu in the catalyst and is 2.0-4.5%, y is the mass percent content of metal Fe in the catalyst, and the value is 2.0-4.5%. The catalyst solves the problems that traditional copper-based and iron-based molecular sieve catalysts are narrow in temperature window and low in denitration activity, under the standard SCR reaction atmosphere condition, the denitration efficiency of the catalyst within the temperature range of 200-500 DEG C can reach 80% or above, and the catalyst has good low-temperature denitration activity and a wide temperature window.