33results about How to "Excellent catalytic reduction performance" patented technology

The invention discloses a vanadium oxide nanotube denitration catalyst with anti-poisoning performance and a preparation method of the catalyst. The catalyst is prepared from a carrier as well as an active substance and a catalysis aid which are supported on the carrier, wherein the carrier is a vanadium oxide nanotube, the active substance is at least one of oxides of cerium, niobium, iron, copper, chromium, cobalt and manganese, and the catalysis aid is oxide of molybdenum or tungsten. The catalyst has a good inhibition function on poisoning effects of phosphate, heavy metals, alkali metals and alkaline-earth metals.

The invention relates to a 'catalyst used for ammonia selective catalytic reduction of nitrogen oxides to nitrogen gas and a preparation method thereof', and belongs to the catalyst technical filed. The catalyst consists of V2O5-WO3/TiO2/BaO/gamma-Al2O3. The catalyst takes gamma-Al2O3 as a carrier, which increases specific surface area of the catalyst and lowers the catalyst carrier cost; BaO is added to protect the carrier against sulfation, reduce oxidization activity on sulfur dioxide and prolong service life of the catalyst; and titanium dioxide is highly dispersed on surface of the carrier, thus improving utilization rate of the titanium dioxide. The catalyst is characterized by low cost, high catalytic activity and very low activity to oxidize sulfur dioxide to sulfur trioxide.

The invention provides a preparation method and an application of a nanogold composite material immunosensor. The method comprises the following steps: dispersing aminated Fe3O4 nano magnetic beads into a Tris buffer solution and connecting with a cancer biomarker antibody (Ab1) as an easy-to-separate immunoprobe; dispersing a hollow polydopamine-nanogold material (PDA-Au) into the Tris buffer solution and connecting with a cancer biomarker antibody (Ab2) as an immune recognition material. Ab1 and Ab2 are specifically combined with a corresponding cancer marker antigen to form a sandwich immune system. The immune system is separated out through the magnetic property, then is added to a mixed water solution of p-nitrophenol and sodium borohydride, and is determined through an ultraviolet visible instrument. The linear range of immune detection of the nanogold composite material immunosensor prepared by the method is 0-100U/mL; the detection lower limit reaches 0.05U/mL; and the related coefficient reaches 0.998.

The invention discloses an activated coke supported nano-gold catalyst as well as a preparation method and application thereof. The catalyst takes activated coke as a carrier, and the surface of the carrier is loaded with gold nanoparticles. The preparation method of the catalyst comprises the following steps: mixing the activated coke with water, then mixing the obtained mixture with a chloroauric acid solution, and carrying out ultrasonic treatment to obtain mixed liquid of the activated coke and chloroauric acid; mixing the obtained mixed liquid with an ascorbic acid solution for carrying out a reduction reaction to obtain the activated coke supported nano-gold catalyst. The activated coke supported nano-gold catalyst provided by the invention has the advantages of being good in dispersity, high in load rate, good in adsorption performance and catalytic performance, and the like; the preparation method of the catalyst has the advantages of simple preparation process, simpleness andconvenience in operation, high production efficiency, short production cycle, low cost, high product yield rate, and the like; an activating agent and a protective agent are not added into the catalyst, and the catalyst can be prepared on a large scale under the room temperature condition, and is beneficial to industrial utilization. The catalyst provided by the invention can rapidly and thoroughly realize catalytic reduction of nitroaromatic compounds, thus having good use value and application prospect.

The invention provides an adsorption/catalysis material for waste gas treatment. The adsorption/catalysis material comprises a honeycomb carrier and an active coating composed of a molecular sieve, asurfactant, a transition metal solution and a binder, according to the preparation method, SiO2-Al2O3-ZrO2 composite sol is used as a binding agent; the firmness between each component of the active coating and the honeycomb carrier is effectively enhanced; the molecular sieve active coating is not easy to fall off; wherein the mass ratio of the honeycomb carrier to the active coating is 8: 1. 1 to 5: 1, the loading capacity of the molecular sieve active coating on the honeycomb carrier is obviously improved; the preparation method comprises the following steps: preparing the active coating from the following components in parts by weight: 100 parts of a molecular sieve, 1-5 parts of a surfactant, 1-3 parts of a transition metal solution with a concentration of 0.1-0.5 mol/L and 1-20 partsof a binder; therefore, the adsorption/catalytic material for waste gas treatment has a good catalytic reduction capacity, and a better waste gas treatment effect can be achieved. The preparation method of the adsorbing/catalyzing material for waste gas treatment is simple, practical and easy to implement.

The invention provides a bismuth nanowire with the thickness of 1.5 nm and a preparation method and application thereof, and belongs to the technical field of nanowire preparation methods. The methodcomprises the following steps: adding bismuth chloride into an ethylene glycol ethyl ether solution; ultrasonically stirring uniformly until the solution is clear, placing the solution in an oil bath,heating to react under the protection of inert gas, then adding a NaI solution, heating to react, cooling to normal temperature, and placing in an ultrasonic instrument for stirring and ultrasonically treating; and meanwhile, quickly adding a NaBH4 reducing solution to obtain the bismuth nanowire with the thickness of 1.5 nm. The invention also provides the bismuth nanowire with the thickness of1.5 nm obtained by the preparation method. The invention also provides an application of the bismuth nanowire with the thickness of 1.5 nm in electrocatalytic reduction of CO2. According to the Bi nanowire material disclosed by the invention, the Faraday efficiency of generating formic acid can be maintained at 85% or above under a wide-spectrum window of-0.48 V vs.RHE to -0.98 V vs.RHE.

The invention discloses a preparation method of conjugate polyvinyl alcohol modified nano molybdenum disulfide. The preparation method comprises the following steps: adding mercaptoethanol into a molybdenum disulfide solution, ultrasonically uniformly dispersing, and freeze-drying to obtain hydroxylated molybdenum disulfide; mixing a polyvinyl alcohol solution and the hydroxylated molybdenum disulfide, and uniformly dispersing, thus obtaining a composite solution; and drying the mixed solution to remove the water, and performing the heat treatment, thus obtaining the conjugate polyvinyl alcohol/hydroxylated molybdenum disulfide complex. According to a composite catalyst obtained by the invention, the conjugate polyvinyl alcohol is introduced, so that the photocatalytic performance of the composite catalyst can be greatly improved.

The invention discloses a direct sodium borohydride fuel cell anode, wherein foamed nickel is taken as a current collector; Pd nano short rods are distributed at the surface of the foamed nickel, and the Pd nano short rods are used as an anode catalyst of the fuel cell. The in situ preparation method of the anode comprises the steps of: taking the foamed nickel as a carrier and the current collector of the anode catalyst arranged at one side of an anode pole plate; assembling the direct sodium borohydride fuel cell from a Pt/C catalyst as a cathode, heating the battery to 80 DEG C, firstly leading mixed liquor at one side of the anode and keeping in an anode flow field, leading ascorbic acid solution or sodium borohydride solution to the anode flow field, making the mixed liquor react with the ascorbic acid or the sodium borohydride solution, so that Pd ions in the anode flow field are restored and attached to the surface of the foamed nickel to grow so as to form the Pd nano short rods; leading deionized water to clean the anode flow field, and obtaining the fuel cell anode. The fuel cell anode has the advantages of stable electronic transmission stability of the anode, good binding force, and high utilization rate of a catalytic space.

The invention discloses a magnetic palladium-carrying nitrogen-doped mesoporous carbon catalyst, a preparation method and an application thereof. A carrier of the magnetic palladium-carrying nitrogen-doped catalyst is nitrogen-doped mesoporous carbon, wherein palladium nano particles and iron nano particles are carried by surface of and pores in the nitrogen-doped mesoporous carbon. The preparation method includes the steps of: dissolving palladium salt to obtain a palladium salt solution, adding the magnetic nitrogen-doped mesoporous carbon to the palladium salt to obtain a mixture liquid; adding a formic acid solution to the mixture liquid, and performing a heating reaction to prepare the catalyst. The catalyst has stable structure and high catalytic performance, can prevent aggregation of the palladium nano particles and iron nano particles, and can be applied for removing Cr(VI) ions in water.

The invention relates to a filtration module capable of repeatedly desorbing and regenerating and a production method thereof. The filtration module is composed of a module shell and composite purification particles filled in the module shell; the module shell comprises a rectangular frame part formed by a U-shaped material frame, a rigid grid mesh, a reinforcing and supporting profile and a rivet welding machine fixing part; the enclosure space of the shell is filled with the composite purification particles. The production method comprises a process of producing the composite purification particles, a process of producing the module shell, a process of filling and a process of sealing. Compared with the prior art, the filtration module is capable of heating, desorbing and repeatedly regenerating; the service life is prolonged by more than ten times; the frequent replacement of the consumable material is obviously reduced; the purification efficiency is improved; the fresh air treatment operation cost is reduced, so that an efficient purification effect is achieved.

The invention relates to a zero-dimensional cerium oxide/three-dimensional porous calcium indium sulfide composite nano-material and a preparation method and application thereof, and the zero-dimensional cerium oxide/three-dimensional porous calcium indium sulfide composite nano-material is obtained by uniformly distributing zero-dimensional cerium oxide on the surface of three-dimensional porous calcium indium sulfide, the three-dimensional porous calcium indium sulfide is obtained by densely clustering calcium indium sulfide nanosheets. The zero-dimensional cerium oxide/three-dimensional porous calcium indium sulfide composite nanomaterial provided by the invention is high in photocatalytic reduction activity, capable of efficiently reducing hexavalent chromium ions in a solution, high in stability and long in cycle service life.

The invention discloses a dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst and a preparation method thereof. The preparation method comprises the steps that: 1, weighing an aluminumsource, a silicon source, phosphoric acid, a template agent, copper nitrate, dysprosium nitrate and deionized water, and preparing a homogeneous aqueous solution A; 2, carrying out a hydrothermal reaction on the aqueous solution A obtained in the step 1, and aging the reaction product at 160-200 DEG C to obtain a reaction product B; and 3, washing and drying the reaction product B obtained in thestep 2, and calcining the reaction product B at the temperature of 450 DEG C or above to obtain the dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst. The preparation method disclosed by the invention can be used for preparing the dysprosium modified Cu-SAPO-34 molecular sieve denitration catalyst disclosed by the invention; the dysprosium-modified Cu-SAPO-34 molecular sieve denitration catalyst provided by the invention can be used for selective catalytic reduction removal of nitrogen oxides in diesel vehicle tail gas, and has certain sulfur dioxide poisoning resistance andgood low-temperature catalytic performance.

The invention relates to a preparation method of a catalyst containing Pd nanoparticles and application of the catalyst in catalytic hydrogenation reduction of Cr < 6 + > in water. According to the method, cetyltrimethylammonium bromide (CTAB) is used as a protective agent, Na2PdCl4 is used as a precursor, ascorbic acid (AA) is used as a reducing agent, palladium nano-particles are prepared under the dynamic control condition, the palladium nano-particles are loaded on an Al2O3 carrier calcined at 600 DEG C, different dynamic control preparation conditions are investigated, and in other words, the influence of the reaction temperature, the reaction time and the use amount of CTAB on the structure and the morphology of the loaded Pd nano-particles is investigated. And then the catalyst is applied to catalytic reduction degradation of pollutants Cr < 6 + > in water. The catalyst is relatively simple in preparation process, has relatively strong catalytic hydrogenation performance, and can be applied to catalysis in the aspects of catalytic reduction of hexavalent chromium, phenol hydrogenation reaction, emission of automobile exhaust, catalytic cracking of petroleum and the like.

The invention discloses a tail gas catalyst for a methanol/diesel oil co-combustion system and a using method of the tail gas catalyst, and belongs to the field of vehicle tail gas catalysts. The tailgas catalyst for the methanol/diesel oil co-combustion system and the using method of the tail gas catalyst are used for solving the problem of tail gas of the combustion system. The tail gas catalyst is mainly prepared from the following components in parts by weight: 2-27 parts of sodium fatty acid methyl ester sulfonate, 30-40 parts of cerium oxide, 30-35 parts of neodymium fluoride, 2-4 partsof triethanolamine, 7.5-12 parts of polyisobutylene succinimide and 3.5-7 parts of molybdenum di(2-ethylhexyl)phosphorodithioate diisopropyl sulfurized oxomolybdenum dialkyldithiophosphate. The massratio of the tail gas catalyst for the methanol/diesel oil co-combustion system toand urea for a vehicle is (0.05 to 0.2):1, after uniform mixing, mixed liquor is obtained and added into a urea metering spraying device. The tail gas catalyst can effectively absorb harmful gas.

The invention discloses a CQD/UiO-66 composite photocatalytic material, and a preparation method and application thereof, and belongs to the field of preparation of photocatalytic materials. The preparation method comprises the following steps: crushing a biomass material to obtain biomass material powder, uniformly dispersing the obtained biomass material powder and urea in water, and continuously carrying out hydrothermal reaction to obtain a reaction solution; carrying out filtration dialysis treatment on the obtained reaction solution, and then carrying out freeze drying to obtain CQD; dissolving zirconium tetrachloride and 2-aminoterephthalic acid in a solvent to obtain a solution A; and dissolving the obtained CQD in the obtained solution A to obtain a mixed solution, carrying out solvothermal reaction on the obtained mixed solution to obtain a solid product after the solvothermal reaction is finished, and separating and purifying the obtained solid product to obtain the CQD/UiO-66 composite photocatalytic material. The CQD/UiO-66 composite photocatalytic material with better photocatalytic activity is prepared by the preparation method which is simple to operate, and can be applied to the aspect of photocatalytic reduction of hexavalent chromium.