374results about How to "Improve denitrification activity" patented technology

The invention relates to a low temperature SCR denitration catalyst taking an organic metal framework as a carrier and a preparation method thereof, belonging to fields of an air pollution regulation technology and an environmental protection catalytic material. The preparation method comprises the following steps: loading oxides of one or more metal elements of Mn, Fe, Cu, V and Ce on an MOFs catalyst carrier to serve as effective components by an immersion method; and obtaining the catalyst by drying, calcinating and sieving, wherein in terms of the total mass of the catalyst, the content of the loaded active metal oxides is 1-20% by mass and the working temperature of the catalyst is 80-200 DEG C. The catalyst has larger specific area surface, higher low temperature catalytic activity, good denitration effect and wide industrial application prospect in the flue gas denitration process.

Disclosed is a hydrogenation catalyst using silicon oxide and alumina as the carrying agent and its preparing process, after sintering, the catalyst comprises nickel oxide 1-10 wt%, molybdenum oxide and tungsten oxide with the total content of greater than 10-50 wt%, and balancing carrying agent.

The invention mainly relates to a SCR (selective catalyctic reduction) flue gas denitration catalyst based on a TiO2-ZrO2 composite metal oxide carrier, belonging to the field of environment protection and environment catalysis. According to the invention, with the nanometer TiO2-ZrO2 as a carrier, WO3 and CeO2 as assistants and V2O5 as an active component, a low-and-medium temperature flue gas denitration catalyst based on the TiO2-ZrO2 composite carrier is obtained. The nanometer TiO2-ZrO2 substitutes the traditional nanometer TiO2 and is used as a carrier, thus the specific area, the heat stability and the acidity of the catalyst are improved; and denitration activity of the catalyst is improved through mutual action among V2O5, WO3 and CeO2; when the ammonia is used as a reducing agent, the catalyst can show very good catalyzing activity at150-450 DEG C.

The invention relates to a three-way NOx, CO and HC removing catalyst used in a marine engine, and a preparation method thereof. The catalyst takes cerium-tin-tungsten composite oxide as an active component, takes one or more oxides of cobalt, ferrum, nickel, copper, lanthanum, molybdenum, manganese, zirconium, silver and yttrium as a promoter, and takes AlSiTi composite oxide as a carrier. A saturated active component solution, a saturated cobalt promoter ionic solution, strong acid alumina gel, diaspore, clayey, titanium dioxide and an organic forming agent are stirred uniformly, mixed, aged and extruded for formation, and the integral type catalyst is obtained through drying and roasting. According to the invention, the catalyst has high NOx removing efficiency, the active temperature window is wide, and the CO and HC removing efficiency is high in a low-temperature collaborated catalyzing manner. According to the catalyst, as the components of the catalyst are nontoxic and environmental-friendly, the catalyst has the advantages that the mechanical strength is high, the vibration resistance as well as the heat resistance is excellent, the preparation technology is simple, and the cost is low. The three-way NOx, CO and HC removing catalyst is applicable to treatment of NOx, CO and HC in tail gas of a marine diesel engine, and is also applicable to treatment to tail gas of other moving sources diesel engines such as automobiles.

The invention relates to a Kocuria palustris strain and applications thereof. The strain is Kocuria palustris FSDN-A, and is preserved in the China General Microbiological Culture Collection Center on July 14, 2011, wherein a preservation number is CGMCCNO.5061. According to the present invention, the strain can adopt nitrite nitrogen or nitrate nitrogen as a substrate to complete a denitrification process; when the Kocuria palustris FSDN-A is adopted to treat ammonia-containing wastewater, characteristics of simple process, high denitrogenation activity, and high concentration organic carbon source tolerance are provided; after the strain is poured, the system is rapidly started; and the strain has broad application prospects in wastewater denitrogenation treatment processes, and is especially suitable for treatment of wastewater containing nitrogen oxides and organic pollutants.

Weight percent ratio of a flue gas Cuo/gamma-Al2O3 catalyst based on cordierite is in that: cordierite carrier is 78.7-93.8%, Al2O3 is 5-16% and CuO is 1.2-5.3%. Cordierite honeycomb ceramic with high intensity is adopted as a substrate, which is impregnated with CuO of a certain concentration after coated with the carrier gamma-Al2O3. The invention can reduce coating crack of the gamma-Al2O3 film and increase firmness of the gamma-Al2O3 coating and uploading capacity of the gamma-Al2O3 by using a simple and effective coating method, and has advantages of enhanced denitrification activity, life and stability of the catalyst.

The invention relates to a hyfrocracking method for producing a gasoline blending component with a high octane value. The hyfrocracking method controls aromatic saturation depth in a first reaction zone, that is, compared with a diesel oil raw oil, a saturation rate of aromatics with two or more aromatic rings in reaction effluent in the first reaction zone is over 60%, the content of monocyclic aromatics is increased to over 40 mass% on basis of liquid components of the reaction effluent in the first reaction zone; and at the same time, organic nitrogen content in feeding materials of a second reaction zone is no higher than 10 [mu]g.g<-1>. The method for controlling the aromatic saturation depth of a hydrofining section and reinforcing hydro-denitrification activity of a hydrofining catalyst, gasoline fractions with sulfur content less than 50 [mu]g/g and a research octane number higher than 90 can be produced from inferior diesel fractions with high content of the aromatics.

The invention discloses a coal ash and attapulgite compound SCR denitration catalyst and a preparation method thereof. Coal ash and attapulgite compound are used as catalyst carriers for carrying the compound material of manganese oxide. The preparation method comprises the following steps: mixing the coal ash with the attapulgite, making the mixture into coal ash and attapulgite compound catalyst carrier by scoring, molding, drying and burning, using the isopyknic immersion method to carry the compound carrier on the catalyst precursor, drying and burning so as to acquire the finished product. In the invention, the coal ash and the attapulgite cheaply obtained are used as the catalyst carriers, so the cost of the catalyst and the environmental loading of the catalyst are reduced, the mouldability and the heat stability are better, and the low-temperature activity of the catalyst is better because of the loading of manganese active component.

A cellular cordierite ceramic catalyst for denitrifying flue gas is composed of cellular cordierite ceramics as the first carrier, the active alumina film (3-5.3 wt.%) as the second carrier and CuO (1.25-15 wt.%) as active component. It is prepared through applying active alumina film on the first carrier, and carrying CuO. Its advantages are low cost, high strength and activity, and high resistance to water and SO2 poisoning.

The invention discloses a catalyst used for low temperature desulphurization and denitration of flue gas and a preparation method thereof. The catalyst uses active carbon modified by nitric acid as a carrier and the transition metal Mn and/or the rare earth element as active components; the active components are loaded on the carrier through dipping and high temperature roasting; and the load amount of Mn is 0 to 7 wt% of the weight of the catalyst, the load amount of Ce is 0 to 9 wt% of the weight of the catalyst, and the total load amount of the active components is no less than 3 wt% of the weight of the catalyst. The preparation method for the catalyst comprises the following steps: soaking active carbon in nitric acid for modification, soaking the carbon modified by nitric acid in a manganese nitrate solution or/and cerium nitrate solution and evaporating a liquid phase to dryness so as to allow the modified active carbon to be infiltrated by Mn and/or Ce; and fully roasting the modified active carbon infiltrated by Mn and/or Ce in a roasting apparatus so as to obtain the active-component-loaded catalyst used for low temperature desulphurization and denitration of flue gas. The catalyst has high desulphurization and denitration efficiency in a temperature range of 80 to 220 DEG C.

The invention discloses a preparation method of an SCR (Selective Catalytic Reduction) flue gas denitrification catalyst. The preparation method comprises the following steps: (1) firstly preparing a mixed solution of titanium sulfate and amino carboxylate, adding powdered molecular sieve into the mixed solution for dipping, and carrying out drying and roasting to prepare a TiO2-molecular sieve composite carrier; (2) dipping the TiO2-molecular sieve composite carrier prepared in the step (1) into dipping liquid containing an active component and an adjuvant precursor, and carrying out drying and roasting to obtain denitrification catalyst powder; (3) mixing the denitrification catalyst powder obtained in the step (2) with glass fiber, wood pulp, polyacrylamide, carboxymethyl cellulose, ammonia water and deionized water, and carrying out kneading, aging, extrusion, drying and roasting to obtain a cellular denitrification catalyst. The preparation method is simple in preparation process and low in cost; the obtained denitrification catalyst is wide in active temperature range, high in denitrification activity and high in SO2 and H2O poisoning resistance.

The present invention relates to a preparation method for an iron-based selective reducing denitration catalyst which takes ferric oxide as an active component and coal powder ash as a carrier and achieves a certain denitration effect simultaneously when catalyzing a denitration action. 70 to 79 wt percent of the coal powder ash, 16 to 25 wt percent of calcium oxide, 5 to 14 wt percent of common silicate cement and a little additive are taken as the raw materials and mixed for autoclave curing so as to make the shaped coal powder ash; after cleanup acid treatment is carried out on the shaped coal powder ash, a dipping method and a program temperature-raising calcination are adopted to support 5 to 15wt percent of Fe2O3 as the active component, then the shaped coal powder ash is put into an atmosphere containing SO2 and O2 for heating and aging. The prepared catalyst has a low cost; the denitration activity can reach more than 90 percent; the desulfurized sulphur capacity can reach 5 to 30wt percent; the working temperature window of the catalyst is broad and more than 200 DEG C. The catalyst can be widely applied to the art of boiler smoke gas treatment in a power station.

The invention relates to a flue gas denitrification powder catalyst as well as a preparation method and application thereof. The catalyst comprises titanium dioxide and manganese oxide serving as main components, as well as auxiliaries which are any three or a combination of three or more in oxides of zirconium, copper, molybdenum, cerium, ferrum, nickel, cobalt, niobium and tungsten, wherein the molar ratio of Mn to Ti is equal to 0.01-1.0, and the molar ratio of each metal in the auxiliaries to a titanium element is equal to 0.01-1.0 independently. The catalyst is prepared through a co-precipitation method. The catalyst can be applied to purification with selective catalytic reduction of nitric oxide (NH3-SCR) in flue gas with a fixed source and a moving source. The catalyst prepared from the non-poisonous harmless raw materials has the advantages of convenient preparation method, high catalytic activity, high N2 selectivity, wide active window, resistance to low-concentration SO2 poisoning and water vapor poisoning, environmental friendliness, etc.

The invention relates to a low-temperature high-activity flue gas denitrification catalyst and preparation thereof. According to the catalyst, a carbon-base material serves as a carrier and carries one or more metal active components of active Al2O3, Mn, Cu and Fe and one or two of rare earth active components of Ce and La. The content of the carbon-base carrier ranges from 35% to 65%, the carrying content of the Al2O3 ranges from 2% to 5% by the content of the aluminum element, the content of the metal active components ranges from 13% to 26% by the content of the metal elements, and the carrying content of the rare earth active components ranges from 20% to 39% by the content of the rare earth elements. According to the catalyst, the carbon-base material is activated through dilute nitric acid and then is coated with aluminum oxide sol, the metal active components and the rare earth active components are carried, then drying and sintering are carried out in the inert atmosphere, and the catalyst is obtained. The catalyst high in flue gas denitrification catalytic efficiently at the low temperature (90-120 DEG C) and not likely to cause poisoning and failures is obtained. The catalyst is low in production cost, simple in production technology and especially suitable for thermal power plants, steel plants, sintering plants and other enterprises with heavy fuel gas emission.

The invention relates to a vanadium doping type titanium base fume denitration catalytic material and a preparation method thereof. The material is characterized in that a surface active agent is used as a pore structure guiding agent, a water solution system sol-gel method is used for preparing the vanadium doping type titanium base catalytic material, and the doping content of active component vanadium is 0.5 to 20wt percent measured by V2O5. Because an in-situ doping loading mode is adopted in the sol-gel process, the preparation method is simple, and the production cost is low; in addition, the prepared denitration catalytic material has larger specific surface area, higher heat stability, higher denitration efficiency and wider active temperature window, and is suitable for the field of removal of coal-fired fume nitrogen oxide. The laboratory simulation fume evaluation shows that when the air speed is 10,000/h, and under the condition that the content of NO is 1000ppm, the removal rate of NO achieves more than 95 percent at the temperature of 180 to 420 DEG C.

The invention discloses a flue gas low-temperature combined desulfurization and denitration technology method mainly including the steps: flue gas after dedusting having a purification temperature and humidity meeting desulfurization conditions is sent into a desulfurization tower to flow through a desulfurization catalyst bed, sulfur dioxide in the flue gas is oxidized into sulfur trioxide under the action of a catalyst, and sulfur trioxide acts with water in the flue gas to generate sulfuric acid; the desulfurization catalyst bed is regenerated through progressively-decreased sulfuric acid concentration gradient washing; the flue gas after desulfurization is sent into a denitration conditioning work section, is dehumidified and heated, and is adjusted to meet requirements of a denitration technology; the flue gas after dehumidification and heating is sent into a mixing tower and is mixed with injected ammonia gas, the mixed flue gas mixed with the ammonia gas is sent into a denitration tower to flow through a denitration catalyst bed, and NOx, NH3 and O2 in the mixed flue gas are converted into N2 and water under the action of a denitration catalyst. The problems that a conventional flue gas desulfurization and denitration technology is narrow in flue gas applicable scope, high in heating energy consumption, high in running cost and the like are overcome.

The invention belongs to the field of chemistry and relates to an industrial gas purification method, in particular to a honeycombed denitration catalyst taking titanium aluminum composite oxide as a carrier and a preparation method thereof. The catalyst comprises the effective ingredients including the titanium aluminum composite oxide, vanadium pentoxide and tungsten trioxide and takes glass fiber as a reinforcing agent, polyacrylamide as an adhesive, glycerol as a lubricating agent and activated carbon as a pore-forming agent. The preparation method comprises the following steps: preparing the titanium aluminum composite oxide; preparing a powder catalyst; extruding and forming the honeycombed catalyst; post-treating the honeycombed catalyst. According to the invention, the flue gas denitration catalyst (SCR catalyst) prepared by the method has high mechanical strength, high denitration activity, good sulfur resistance and reliable production process and can meet the demands on the denitration of nitric oxide by industrial flue gas, thereby having better application prospect; the honeycombed denitration catalyst prepared by the method has great significance in breaking through the foreign technical barriers and promoting the development of the denitration industry in China.

The invention discloses a regeneration method for an inactivated TiV-based honeycomb denitration catalyst having the combined denitration and demercuration modification function. Firstly, the physical and chemical properties of an SCR denitration catalyst are detected, and the inactivated reasons of the catalyst are analyzed. Secondly, the regenerable catalyst is subjected to ultrasonic cleaning in deionized water, a strong alkaline solution or a strong acid solution, so that deposited ashes and pernicious elements in the catalyst can be removed. Thirdly, the cleaned catalyst is immersed in a combined denitration and demercuration regeneration solution, until the activity of the catalyst is stable. Finally, the activated catalyst is transferred to a microwave oven to be dried and calcined through the microwave heating process. The catalyst, obtained through the above method, successively has the combined oxidation and demercuration capacity, while the denitration activity of the catalyst is recovered at the same time. At a temperature smaller than 350 DEG C, the denitration efficiency of the catalyst is up to be equal to or over 90%, and the demercuration efficiency of the catalyst is up to be equal to or over 90%. Meanwhile, the condition that the cost is increased due to the demercuration process after the flue gas denitrification process can be avoided. Therefore, the method is economical and environmentally-friendly, thus being suitable for industrial promotion.

The invention discloses an ozone treatment regeneration method and an ozone treatment regeneration device for a vanadium titanium-based flue gas denitration catalyst. The method comprises the following steps of: filling an inactivated flue gas denitration catalyst into a catalyst regeneration reaction bed; introducing ozone-air mixed gas into the catalyst regeneration reaction bed; and finishing the catalyst regeneration process after oxidation. The ozone treatment regeneration device for the vanadium titanium-based flue gas denitration catalyst comprises an ozone generator, a four-way valve,the catalyst regeneration reaction bed and an ozone exhaust catalytic decomposition treatment device, wherein four connecting ports of the four-way valve are connected with two ends of the catalyst regeneration reaction bed, the ozone generator and the ozone exhaust catalytic decomposition treatment device through pipelines respectively; the flow direction of the ozone-air mixed gas is changed byadjusting the four-way valve; and MnO2-CO3O4/TiO2 is filled into the ozone exhaust catalytic decomposition treatment device, and the exhaust is decomposed in the ozone exhaust catalytic decompositiontreatment device.

The invention discloses a denitration catalyst regeneration solution and a preparation method thereof as well as a catalyst regeneration method. The denitration catalyst regeneration solution comprises the following raw material ingredients in parts by weight: 4-6 parts of vanadyl oxalate, 0.08-0.10 part of cerium nitrate, 0.11-0.13 part of lanthanum nitrate, 0.05-0.07 part of copper nitrate, 0.4-0.6 part of silica sol ST-O and 95 parts of deionized water. The catalyst regeneration method comprises the following steps of firstly, evenly mixing vanadyl oxalate and the deionized water; then, feeding cerium nitrate, lanthanum nitrate and copper nitrate into mixed solution, and fully stirring until the mixture is completely dissolved; finally, feeding silica sol ST-O, and continuing to stir until homogeneous phase is obtained; and sequentially carrying out strong scavenging and ultrasonic cleaning on an inactivated denitration catalyst module, soaking the module in cleaning solution for 18-25 minutes, continuing soaking the module in the regeneration solution for 25-40 minutes, taking out the denitration catalyst module and drying. After the denitration catalyst regeneration solution and the catalyst regeneration method are adopted, the activity of the inactivated denitration catalyst can be efficiently recovered, and the temperature range of the catalyst activity is widened.

The invention discloses a denitration catalyst for a wide temperature window under a high sulfur condition and a preparation method thereof. The catalyst is prepared from the following components in percentage by weight of the denitration catalyst: 1wt% of vanadium pentoxide, 6wt% of tungsten trioxide, 5wt% of one of manganese oxide, cerium oxide, ferric oxide without sulfur or ferric oxide with sulfur, and the balance of titanium dioxide. The preparation method comprises the following step: adjusting a commercial V2O5-WO3/TiO2 catalyst by adding traditional metals iron and manganese and rare earth cerium, specifically, in the preparation process of the catalyst, adding ferric nitrate, ferric sulfate, manganese acetate or cerous nitrate to obtain the highly active catalyst which has good SO2 poisoning resistance and has the denitration activity over 80% under the condition that the temperature is 260-420 DEG C in a relatively wide high-temperature region and the SO2 concentration is high (1000ppm).