86results about How to "Efficient catalytic performance" patented technology

The invention discloses a beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and a preparation method thereof. The photocatalytic composite nanofiltration membrane is prepared by performing codeposition on dopamine and polyethyleneimine on a porous supporting membrane to form a crosslinking nanofiltration membrane with a separating surface layer first and then loading beta-FeOOH nanocrystals on the separating surface layer. The loaded beta-FeOOH nanocrystals can promote photocatalytic oxidation reaction in the presence of hydrogen peroxide to degrade organic pollutants in wastewater or attached to the surface of the composite membrane, so that not only is achievement of the completely-innocent treatment of pollutant-containing wastewater facilitated, but also the pollution of the membrane surface can be reduced to achieve self cleaning of the membrane surface, and thus the separating efficiency of the composite nanofiltration membrane is improved and the service life of the composite nanofiltration membrane is prolonged.

The invention relates to a catalyst for producing low-carbon olefins through efficient conversion of CO2, and a preparation method the catalyst. The catalyst is characterized in that the structural formula of the catalyst is A-(B(C<x>Fe<y>)O<z>)-Fe/S, wherein x plus y is equal to 2, z is equal to 3.2-4.2, A is alkali metal or alkaline-earth metal element, B is divalent ions of a transition metal element, C is trivalent ion of the transition metal element, S is a carrier, and A-(B(C<x>Fe<y>)O<z>)-Fe is an active constituent. The invention provides a Fe-based catalyst for producing olefins through efficient conversion of CO2, as well as a preparation method of the catalyst, aiming at the problem that the yield of low-carbon olefins prepared by current CO2 hydrogenation reaction is low. A main product obtained when the catalyst is used for CO2 hydrogenation reaction is low-carbon olefins (propylene, ethylene and butene). The conversion rate of CO2 achieves more than 60%, the selectivity of the low-carbon olefins achieves more than 60%, and the catalyst has the characteristics of being simple in the preparation method, low in cost, and high-efficiency in catalysis performance.

The invention discloses a preparation method of N-doped porous carbon coated nano-particles (Co@Ir/NC-x, and x is the quality ratio of Ir) of a Co-Ir core-shell structure and application of the N-doped porous carbon coated nano-particles of the Co-Ir core-shell structure to catalytic water splitting. The preparation method has the advantages that (1) the preparation process is simple and direct, and energy consumption is low, specifically, Co/NC obtained after a zeolite imidazole framework material (ZIF-67 for short) is calcined is directly subjected to Galvanic replacement with Ir<3+> at theroom temperature, high temperature and high pressure are not needed, and accordingly the energy consumption is low; (2) the catalytic performance is good, and the stability is high, specifically, a Co@Ir/NC-10% sample is in a 1M KOH solution, in an oxygen producing test, the current density is 10 mA cm<-2>, the overpotential is 280 mV, and the performance is higher than IrO2; in a hydrogen producing test, the current density is 10 mA cm<-2>, the overpotential is -121 mV; besides, after a stability test of 12 h, the oxygen producing activity of IrO2 is attenuated by 55.8% while the oxygen producing activity of Co@Ir/NC-10% is attenuated only by 20.6%, and the hydrogen producing stability of Co@Ir/NC-10% is far higher than that of commercial Pt/C under the same conditions; and (3) the catalyst cost is low and the Co source is wide, specifically, the nano-particles are of the core-shell structure with Co as a core and Ir as a shell, the amount of Ir is reduced on the basis of more exposedcatalytic activity sites, a core metal precursor Co is wide in source and low in cost, the catalyst cost is greatly reduced, and great commercial application prospects are achieved.

The invention belongs to the field of catalyst materials for waste water treatment, and provides a supported advanced oxidation catalyst material and a preparation method thereof. The method includes the steps: (1) pre-treating carrier materials; (2) placing the pretreated carrier materials into plating solution with a pH (potential of hydrogen) value of 3-13, stirring mixture for at least 5 minutes at the temperature ranging from 30 DEG C to 90 DEG C, performing solid-liquid separation, cleaning a solid phase by the aid of water and organic solvents, and drying the cleaned solid phase to chemically-plated carrier materials; (3) aerobically roasting the chemically-plated carrier materials for 1-8 hours at the temperature ranging from 200 DEG C to 1000 DEG C to obtain the catalyst material. According to the catalyst material, metal oxides are uniformly loaded on the surfaces of the carrier materials, binding force among the loaded metal oxides and the carrier materials can be effectively improved, loading capacity is improved, the service life of the catalyst material is prolonged, catalytic activity is improved, and secondary pollution caused by metal ion leaching is effectively relieved.

The invention provides a nano-composite catalyst and a preparation method thereof, belongs to the technical field of catalyzing, and solves the problem that the conventional load nano-composite oxide catalyst is low in nano-composite degree, and poor in catalyzing performance. The nano-composite catalyst is obtained by the flowing steps based on the condition that a surface-active agent is not used: firstly, reducing composite oxide crystal lattices or first metal ions mixed in the crystal lattices so as to obtain nano-metal granules containing first metal; and then introducing second metal into the surface of the first metal by Galvanic substitution reaction so as to obtain the nano-composite catalyst. Compared with the conventional catalyst, the nano-composite catalyst has more efficient catalyzing performance when being used for catalytic reaction of VOC (volatile organic compound) removal, automobile tail gas purification, formaldehyde removal, methane combustion, hydrogenation, hydrogenolysis, ammonia synthesis, ammonia decomposition, hydrocarbon synthesis, hydroformylation and the like.

The invention discloses a silver copper nano alloy electro-catalyst and a laser gas phase deposition method thereof. The silver copper nano alloy electro-catalyst is obtained by depositing on a titanium sheet via a laser gas phase deposition method by taking the titanium sheet as a substrate and taking silver copper alloy as a target. The mole ratio of silver to copper in the silver copper nano alloy electro-catalyst is 4 to 1; the structure morphology of the silver copper nano alloy electro-catalyst is nanocrystalline and non-crystalline, and the nanocrystalline is embedded into the non-crystalline; or the structure morphology of the silver copper nano alloy electro-catalyst consists of nanocrystalline or multi-crystalline, wherein the nanocrystalline is a solid solution of a silver and copper face-centered cubic structure, the non-crystalline is metal copper, and the multi-crystalline is multi-crystalline copper. According to the silver copper nano alloy electro-catalyst and the laser gas phase deposition method, the oxygen reduction reaction catalytic effect is superior, and the preparation cost is low.

The invention relates to a preparation method for a carbon/metal oxide nanofiber composite catalyst. The preparation method comprises the following steps of (a), dissolving a metal ion-containing salt solution and a high-molecular polymer into an organic solvent, and stirring to form a spinning precursor mixed solution, wherein the metal ion concentration is weighed based on a stoichiometric ratio; (b), performing electrostatic spinning on the spinning precursor mixed solution to form a composite non-woven material; and (c), putting the composite non-woven material into an inert atmosphere to be subjected to high-temperature calcining to obtain the carbon/metal oxide nanofiber composite catalyst. The carbon/metal oxide nanofiber composite catalyst has high electrical conductivity, reinforced oxygen reduction electro-catalytic property and excellent oxygen evolution performance, and is a dual-functional catalyst with efficient catalytic property.

The invention discloses a preparation method of a CeO2-graphene aerogel catalyst material. Rare earth oxide CeO2 is compounded with graphene aerogel through a sol-gel process by adopting a hydrothermal reduction method or a chemical reduction method, and finally the CeO2-graphene aerogel composite material with excellent and efficient catalytic performance is prepared. Loading of nano oxide particles improves agglomeration between graphene sheet layers, and the graphene aerogel serves as a carrier, so that more catalytic active sites are provided for active components, the dispersibility of active oxide nano particles is improved, and the active components are in fully contact with reactants. By the catalyst material, the defect of a single-component material can be overcome effectively, so that the catalytic efficiency is greatly improved. The specific surface area of the prepared CeO2-graphene aerogel catalyst material is 138-187 m2/g, and the catalytic conversion rate of NO is 86-95%.

The invention relates to a method for preparing a MnOx-CeO2-graphene aerogel catalyst material. The MnOx-CeO2-graphene aerogel composite material with an excellent and efficient catalytic performanceis prepared by compounding a rare earth oxide CeO2 and a transition metal oxide MnOx with graphene aerogel through sol-gel technology by using a hydrothermal reduction process or a chemical reductionprocess. The loading of nano-oxide particles improves the agglomeration between graphene layers, and the graphene aerogel used as a carrier provides many catalytic active sites for the active components and improves the dispersibility of active oxide nanoparticles in order to make the active components in sufficient contact with reactants. The catalyst material can effectively solve the defects ofsingle-component materials in order to greatly improve the catalytic efficiency. The prepared MnOx-CeO2/graphene aerogel catalyst material has a specific surface area of 119-145 m<2>/g and a NO catalytic conversion rate of 89-99%.

The invention relates to the technical field of purifying agents for vehicles, in particular to a porous grapheme-based air purifying agent. The porous grapheme-based air purifying agent is prepared from the following substances in parts by weight: 3-12 parts of organic titanate, 0.1-1 part of soluble metal salt, 1-3 parts of a silane coupling agent, 5-8 parts of graphene oxide, 3-8 parts of oxometallate, 1-12 parts of tripolycyanamide, 1-5 parts of a foaming agent, 80-150 parts of polypropylene resin, 2-10 parts of inorganic acid and 10-50 parts of a solvent. The porous grapheme-based air purifying agent can adsorb harmful gases in air, can catalyze the harmful gases in situ at an adsorption point, and has the advantages of high catalytic efficiency, high removal rate and thorough purification.

The invention relates to a preparation method and an application of bipyridine functionalized COF loaded palladium nanoparticles. The preparation method comprises the following steps: adding 1,3,5-benzenetricarboxaldehyde and 5,5'-diamino-2,2'-dipyridyl in an organic solvent to obtain a mixed solution A, dropwise adding an aqueous acetic acid solution into the mixed solution A, sequentially carrying out liquid nitrogen freezing-vacuumizing-thawing cycle operation, performing vacuum sealing, thawing to room temperature, and carrying out a constant-temperature reaction at 120-150 DEG C for 3-6 d; carrying out unsealing, dropwise adding tetrahydrofuran to carry out a quenching reaction, carrying out solid-liquid separation, washing the solid, and carrying out vacuum drying to obtain a solid powder D; and carrying out wet grinding on the solid powder D to obtain a micropowder, sequentially adding ethanol and a palladium salt solution into the micropowder, carrying out a stirring reaction for 2-4 h, dropwise adding a NaBH4 solution until the mixed solution is brown yellow, continuously carrying out a reaction for 1-2 h under a stirring condition, carrying out solid-liquid separation, washing the solid, and carrying out vacuum drying to obtain the bipyridine functionalized COF supported palladium nanoparticles. The bipyridine functionalized COF loaded palladium nanoparticles are usedas a catalyst for catalyzing a semi-hydrogenation reaction of acetylene.

The invention discloses a zinc-air battery and a preparation method and application thereof. A three-dimensional carbon nanotube jungle composite material is used as an oxygen reduction reaction (ORR)and oxygen evolution reaction (OER) electrocatalyst, the three-dimensional carbon nanotube jungle composite material is loaded on a conductive substrate to be used as an air electrode, and then the air electrode, an electrolyte and a negative electrode conventionally form the zinc-air battery. The invention provides a new way for preparing the efficient and controllable three-dimensional CNT through adopting a one-step pyrolysis gas phase method. The pipe diameter of the CNT and the particle size of the embedded metal particles are fine and uniform and are uniformly dispersed, and the CNT hasa large specific surface area and rich micro/nano hole channels, so that more active sites and substance transmission can be exposed, extremely small overpotential and excellent stability are shown in ORR and OER processes, and the material is successfully applied to the ZAB as a positive electrode catalyst, and shows good cycling stability and relatively small potential polarization.

The invention relates to a catalytic combustion catalyst containing manganese-cerium-titanium-hafnium composite oxide. The catalyst takes cordierite-based honeycomb ceramic as a carrier which is sequentially coated with a first metal oxide coating and a second metal oxide coating from inside to outside; the first metal oxide coating is prepared from titanium-hafnium oxide; and the second metal oxide coating is prepared from manganese oxide and cerium oxide. The catalyst provided by the invention has the advantages that by adopting non-noble metals for replacing noble metals, on the one hand, the defects of high price, poor poison resistance and the like of the noble metals are overcome, and on the other hand, the raw materials of the non-noble metals are easily available and the technologyis simple and convenient; and the catalyst provided by the invention is uniform in coating dispersion, active components and the carrier are tightly combined, the thermal stability is high, the catalytic activity is high, the service life is long, and large-scale industrial production is easy to realize.

The invention discloses a mesoporous manganese-based composite oxide, a preparation method and application thereof, and belongs to the field of materials. The method comprises the following steps: mixing an organic solution of a divalent manganese salt and a divalent transition metal salt with an inorganic alkali organic solution containing organic amine, and carrying out precipitation, centrifugation, washing, drying and roasting treatment processes by using an in-situ oxidation-reduction reaction to obtain the mesoporous manganese-based composite oxide. The method has the advantages of simple preparation process flow, abundant raw materials and low cost, and is suitable for industrial application. The manganese-based composite oxide prepared by the method has a high specific surface area and a large pore volume, generates a large number of stable oxygen vacancies, shows efficient ozonolysis activity, stability and water resistance at room temperature as an ozonolysis catalyst, and has important value in the fields of porous metal composite oxide material preparation and atmospheric pollution control ozone treatment.

The invention discloses an air purifying filter screen and a preparation method thereof; the air purifying filter screen is composed of a carrier and a catalyst; the carrier is composed of foam ceramics, and the foam ceramics are activated by an acid activator and then are subjected to surface modification by a surface modification agent; the catalyst comprises manganese oxide, nickel oxide and cerium oxide. The preparation method of the air purifying filter screen comprises the steps: soaking the foam ceramics with the acid activator, carrying out activating treatment of the surface and internal gaps of the foam ceramics with the acid activator, then soaking the cleanly washed foam ceramics with the surface modification agent, dissolving a manganese salt, a nickel salt, a cerium salt and a surfactant in water, stirring the components at room temperature, then adding a strong alkali, adjusting the pH to 8.0-10.5, carrying out a reaction for 1-30 h, then filtering, and mixing the obtained filter slag with a silica micro-powder to obtain slurry; spaying the slurry to the surface and the pore passage interior of the carrier by a spraying machine; and finally, calcining for 0.5-6 h at the temperature of 200-450 DEG C. The prepared purifying filter screen has the characteristics of small wind resistance, firm adhesion and high purification efficiency.

The invention discloses a tertiary leucine derived chiral amine compound as well as a preparation method and application thereof. The chiral amine compound contains a tert-butyl group, a primary amine, a secondary amine or a tertiary amine functional group and has the structural formula as shown in the specification; and chiral amine and salts thereof are prepared through simple preparation steps by taking common tert-leucine as the raw material to form the chiral amine compound. The chiral amine and the salts thereof can be used for the asymmetrical Michael additive reaction between alpha, beta-unsaturated ketone and a nucleophilic reagent such as nitrocarbol, malonic ester, substituted oxazolone and the like and the asymmetrical cascade reaction between the alpha, beta-unsaturated ketone and fifth-position unsaturated rhodanine, between fifth-position unsaturated hydantoin and the alpha, beta-unsaturated ketone; and the tertiary leucine derived chiral amine compound has very high catalytic activity and stereoselectivity as well as the highest diastereoselectivity of 30/1 and the highest enantioselectivity of 99%, and is wide in oligomer range.

The invention provides a preparation process of a novel ester type anti-wear agent for diesel oil. The preparation process comprises the following steps: in a nitrogen protection atmosphere, carryingout an esterification reaction on polyol and straight-chain fatty acid in a molar ratio of 0.9-1.1 at 125-140 DEG C for 8-10 hours in the presence of a water-carrying agent and a molecular sieve supported catalyst; carrying out natural cooling after the esterification reaction is finished, and when a temperature decreases to 58-62 DEG C, carrying out extraction under a reduced-pressure condition to remove the water-carrying agent, and then filtering the product to filter out the molecular sieve supported solid catalyst; and after a product system is cooled to room temperature, removing residual trace moisture and inorganic impurities in the reaction product, adding a branched chain polyether type demulsifying agent, and carrying out sufficient mixing under stirring to obtain an ester typeanti-wear agent product for diesel oil. The ester type anti-wear agent for diesel oil prepared by using the method disclosed by the invention has the advantages of extremely low acid value, good anti-wear performance, extremely low condensation point and extremely good demulsibility.

The invention provides a Ru-ZnO photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysts. The preparation method of the Ru-ZnO photocatalyst provided by the invention comprises the following steps: mixing zinc salt with oxalic acid and water, and carrying out precipitation reaction to obtain zinc oxalate; carrying out first annealing on the zinc oxalate to obtain ZnO; mixing the ZnO with ruthenium chloride and water, and carrying out oxidation-reduction reaction to obtain a precursor; and carrying out second annealing on the precursor to obtain the Ru-ZnO photocatalyst. The Ru-ZnO photocatalyst obtained by the preparation method provided by the invention can efficiently catalyze and degrade methane under simulated sunlight,and shows excellent performance of photo-catalytically purifying low-concentration methane in air at normal temperature and normal pressure; the 0.1-Ru-ZnO photocatalyst shows quite good cycling stability in ten times of cyclic degradation tests.

The invention discloses a fuel cell platinum-based alloy catalyst preparation method, and the method comprises: (1) dissolving a metal salt at least containing a cobalt salt, and adding ammonia water or a small molecule containing an amino group and an alkali to form a sol; (2) carrying out microwave heating on the sol; (3) mixing the heated sol with a platinum-containing catalyst, carrying out drying, carrying out annealing treatment, and carrying out acid pickling and drying to obtain the platinum alloy catalyst. The method disclosed by the invention has the characteristics of rapidness, simplicity and convenience in preparation, and is convenient for batch and large-scale production. Meanwhile, the platinum-cobalt alloy catalyst prepared by the method is uniform in particle size, high in catalytic performance and suitable for an oxygen reduction reaction catalyst in a fuel cell.

The invention discloses a method for preparing a cyclodextrin/reduced graphene oxide modified ferroferric oxide compound and application of the compound in water treatment. The method includes following steps: dispersing 20mg of graphene oxide into 20ml of ethylene glycol, using an ultrasonic cell breaker to treat for 30min to form uniform dispersion liquid, adding 0.4g of FeCl3 6H2O, 1.13g of sodium acetate, 0.3g of polyethylene glycol and 20mg of beta-CD into the dispersion liquid, and magnetically stirring for 30min; transferring mixed dispersion liquid into a reaction kettle for reaction at 200 DEG C for 8h; using deionized water and alcohol to repeatedly wash obtained precipitate, and vacuum-drying at 50 DEG C for 12h; grinding a final product for standby use. A catalyst prepared by the method has excellent catalytic performance, can remove pollutants within short time, is suitable for wide pH range and reusable and is expected to be used for degrading difficult-to-remove pollutants.

The invention discloses reverse micelle emulsion used for biological enzyme immobilization. The reverse micelle emulsion used for the biological enzyme immobilization comprises the following components in parts by weight: 5-20 parts of OP-10, 10-35 parts of n-octyl alcohol, 30-60 parts of isooctane, 0.1-1.0 part of Tris-HCl buffer solution and 0.1-8.0 parts of distilled water. The reverse micelle emulsion used for the biological enzyme immobilization has the advantages that a surfactant is dispersed into a continuous non-polar solvent, and a nanoscale stable aggregate is spontaneously formed; when the reverse micelle system is taken as a medium for carrying out biological enzyme immobilization, a biological enzyme orientationally exists at an oil-water interface of a reverse micelle, active groups of the biological enzyme are orientationally and regularly toward an organic solvent phase, and groups reacting with nano magnetic particles are regularly toward a water pool, so that loss of the active groups of the biological enzyme is greatly avoided, and the immobilized biological enzyme has efficient catalytic performance; meanwhile, after reaction is finished, the reverse micelle system can be recycled and repeatedly used, so that the reverse micelle emulsion used for the biological enzyme immobilization has a broad development prospect.