74results about How to "Good catalytic properties" patented technology

The invention discloses a lamellar micron flower-like MoS2/Ni3S2/NiFe-LDH/NF material, a synthesis method and application thereof. The method includes: taking nickel foam as the substrate and nickel source, firstly synthesizing a MoS2/Ni3S2/NF nanorod array under a 180-220DEG C hydrothermal condition, then introducing a nickel-iron double-layer hydroxide under a 120-160DEG C hydrothermal condition, thus finally forming the lamellar micron flower-like MoS2/Ni3S2/NiFe-LDH/NF material. The target product prepared according to the invention has good catalytic properties in the anodic urea oxidation reaction and cathodic hydrogen evolution reaction in an alkaline solution, and shows good bifunctional catalytic activity. At the same time, in an alkaline double-electrode electrolytic tank systemcontaining urea, only a 1.408V (vs.RHE) tank pressure is needed for reaching an electric current density of 100mA cm<-2>, and is far lower than that of a precious metal double-electrode system in an alkaline electrolyte solution. Therefore, the material is expected to replace precious metals for application in efficient urea oxygenolysis and electrocatalytic hydrogen evolution.

The invention provides a preparation process of a composite copper powder catalyst, comprising the steps of cutting an electroplating copper plate into a copper block and machining into copper scales; grinding the copper scales into sheet-shaped copper powder; obtaining sheet pure copper powder through a magnetic selection and air flow grading technology; smelting and atomizing a copper-tin-zinc alloy to prepare needed copper-tin-zinc alloy powder; drying and screening, and grinding to obtain scale-shaped copper-tin-zinc alloy powder; magnetically selecting and screening to obtain the needed copper-tin-zinc alloy powder; and mixing the sheet pure copper powder with the copper-tin-zinc alloy powder according to a ratio to obtain the needed composite copper powder catalyst. According to the preparation process of the composite copper powder catalyst, elements which are harmful to an environment are not introduced in a whole process, the quality stability of a product is good, concave-convex defects of the surface of powder grains are more and the specific surface is large; the catalysis property of the composite copper powder catalyst is obviously better than that of common composite copper powder so that the effect of an organic silicon monomer synthesized metal catalyzing system is improved, the time-space yield of an organic silicon monomer synthesized fluidized bed is increased, a synthesis reaction period is prolonged, the selectivity is improved, the cost is reduced and good economic benefits are created.

The invention provides a chemical warfare agent self-disinfection MOF (metal organic framework) fiber filtering membrane and a preparation method thereof. The preparation method comprises the following steps of performing electrostatic spinning calcining to prepare a zirconium oxide fiber film; mixing with a corresponding organic ligand and an activated acid solution, and performing hydrothermal reaction, so as to obtain the self-disinfection MOF fiber filtering membrane. The prepared self-disinfection MOF fiber filtering membrane has the advantages that the additional support material is notneeded, the self ultra-large specific surface area of MOFs is maintained, and the adsorption capacity and catalytic property are excellent; by adopting the micro-nano multi-stage structure, the reaction matter is favorably transmitted, the catalytic sites are exposed, and the agglomeration of the catalyst is avoided; the excellent self-disinfection property is realized; the degrading conversion rate of a simulating matter of a chemical warfare agent is high, the half-life period is short, and the stability in cyclic use is good; by adopting the thin film form, the self-disinfection MOF fiber filtering membrane can be directly applied into the actual filtering protection device.

The invention relates to a low-temperature solid oxide fuel cell and a making method thereof. The structure of the low-temperature solid oxide fuel cell comprises an anode film deposited on the inner wall of a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta composite film, a cathode film deposited on the inner wall of the porous perovskite structure oxide ceramic La1-xSrxGa1-yMgXO3-delta composite film, and a compact perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta electrolyte film positioned between the anode film and the cathode film, wherein each of x, y and delta is equal to or more than 0 and equal to or lower than 0.2, and the perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta composite film is formed through a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta substrate, the perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta and a porous perovskite structure oxide ceramic La1-xSrxGa1-yMgyO3-delta film. The invention also provides the making method of the low-temperature solid oxide fuel cell.

The invention discloses a non-noble metal-based two-dimensional MoS2/graphene water reduction catalyst as well as a preparation method and application thereof. The prepared two-dimensional MoS2/graphene can be effectively applied to preparing hydrogen through photocatalytically reducing water. The two-dimensional MoS2/graphene water reduction catalyst provided by the invention has the following chemical general formula: (MoS2)x(graphene)y, wherein x to y is the mass ratio between MoS2 and graphene, and x to y is equal to (50-0.25) to 1. The catalyst provided by the invention is made by means of a hydrothermal method, and may perform the cooperative reinforcement on the performance of catalyzing water for preparing hydrogen via reduction by using excellent proton reducing capacity of the MoS2 and good charge transfer capability of the graphene.

The invention discloses a functionalized ionic liquid used for modifying a lipase. The structure of the functionalized ionic liquid is shown as a formula (I). In the formula (I), n is 1-7, m is 1-2, and Y is a chloride ion, a bromide ion, a tetrafluoroborate ion, a hexafluorophosphoric acid radical ion or a trifluoromethylsulfonylamine ion. By subjecting the free lipase to chemical modification with the functionalized ionic liquid, stability, activity and catalytic selectivity of the free lipase can be improved. The invention also discloses a preparing method of the functionalized ionic liquid and the lipase obtained by modification. The functionalized ionic liquid with a multiple heterocycle skeleton structure is introduced onto the surface of the lipase after modification, thus influencing the configuration of the enzyme active center and improving the catalytic effects of the lipase.

Provided are a micro nano silver-based material preparation method and a micro nano silver-based material. The method includes: 1) preparing a silver nitrate solution; 2) preparing a vitamin C solution; 3) dissolving Arabic gum into purified water to obtain an Arabic gum water solution; 4) slowly dissolving the vitamin C solution into the Arabic gum water solution to obtain a solution D; 5) slowly adding the silver nitrate solution into a solution D in the stirring state; 6) utilizing a centrifugal machine to conduct separation, collecting a precipitate; adding alcohol in the precipitate to conduct ultrasonic washing, conducting centrifugal separation after washing to collect the precipitate to obtain silver particles, adding deionized water into the silver particles to conduct ultrasonic washing, conducting centrifugal separation after washing and collecting maple powder to obtain the maple micro nano silver-based material. The micro nano silver-based material which is low in cost, quick in preparation process, high in yield, environmentally friendly and capable of saving energy and the micro nano silver-based material preparation method are provided.

The invention belongs to an electrochemical test device, in particular to an electrochemical sensor for testing adrenalin and ascorbic acid synchronously, comprising a glass-carbon electrode which surface is coated by a sequential porous carbon-cation exchange polymer Nafion sensitive film. The invention uses the cation exchange polymer Nafion as disperser, to easily disperse sequential porous carbon in stable property into water. And the electrochemical sensor composed of a sensitive film made by coating the disperser liquid on the surface of the glass-carbon electrode and the glass-carbon electrode can synchronously adrenalin and ascorbic acid.

The invention discloses a catalyst for preparing advanced hydrocarbon by Fischer-Tropsch synthesis and a preparation method of the catalyst. The method comprises the following steps: dissolving a mixed liquor of soluble cobalt salt and soluble zircon salt in deionized water to obtain a liquor A; dissolving sodium silicate and a precipitator in the deionized water to obtain a liquor B; under stirring, dropping the liquor A and the liquor B to hot deionized water at the same time; reacting to obtain purple precipitates; washing the precipitates obtained with the deionized water for a plurality of times; adding a mixed liquor of soluble potassium salt and a pore forming substance to the precipitates; then, adding an organic solvent which is 5-20 times the weight of the precipitate and stirring for 2 hours; stirring while distilling the solvent at 110-120 DEG C; drying a taken sample at 110-120 DEG C for 10 hours to obtain a catalyst precursor; and then, tabletting, forming and reducing to obtain the catalyst. In the catalyst, the content of cobalt is 55-75wt%, the content of zircon is 2-4wt% and the content of potassium is 1-2wt%. The catalyst can be used for preparing heavy hydrocarbon from synthesis gases through the Fischer-Tropsch synthesis, and has the characteristics of high catalytic activity, high C<5+> selectivity, long service life and the like.

The invention discloses a platinum and polyaniline composite nanofiber three-dimensional functional structure film and a preparation method thereof. The preparation method of the film comprises the following steps: (1) a curing eigenstate polyaniline nanofiber is electrochemically prepared; (2) a conductive polyaniline three-dimensional structure nanofiber structure is prepared through electrochemical doping; and (3) the platinum and polyaniline composite nanofiber three-dimensional functional structure film with wholly platinum-enveloped morphology is prepared through an electrochemical deposition method. The platinum and polyaniline composite nanofiber three-dimensional functional structure film has excellent physical-chemical stability and better catalysis capacity, and can be applied to such biosensors as glucose sensors and lactic acid sensors.

The invention relates to a preparation process of a flaky pure copper powder catalyst. The preparation process comprises the steps of: preparing copper cuttings, grinding the copper cuttings, and grading flaky copper to prepare the flaky pure copper powder catalyst. As any element harmful to an environment is not introduced to the whole process course, the harmful impurity content is low, and the stability of product quality is good; the catalytic characteristic is obviously better than that of common composite copper powder, so that the effect of synthesizing a metal catalytic system by an organosilicone monomer is improved, organosilicone monomer synthesis and the space time yield of fluidized beds are increased, the synthetic reaction period is prolonged, the preparation efficiency of dimethyldichlorosilance is improved, the cost is reduced, and the benefits are created; and promoters, such as Zn, Sn and P are used so that the synthetic reaction of the organosilicone monomer can be flexibly regulated according to impurity conditions in the fluidized beds and contact compositional variation, and the problems of low activity and selectivity of the composite copper powder and deteriorated catalytic performances as reaction goes on are solved.

The fast detection process of lipase synthesis activity in nonaqueous phase belongs to the field of nonaqueous enzyme catalysis technology. Lipase is used in catalyzing the esterification between p-nitro phenol ester and alcohol in nonaqueous phase, and after reaction for certain time, reacted liquid in certain amount is extracted with 0.1M concentration NaOH solution and the absorbance at 410 nm is measured in a colorimetric process so as to determine the amount of produced p-nitro phenol. The lipase activity unit is defined as the amount of lipase required for producing 1 micromol of p-nitro phenol. The present invention is used for the direct screening of lipase producing bacteria with high ester synthesizing activity and has relatively low cost.

The invention relates to a silver nanoparticle-dispersed cobalt oxide functional thin film material and a preparation method, and belongs to the field of photocatalysis. The material is characterized in that the general formula of chemical compositions of the thin film material is Agx / (Co3O4) 1-x, wherein x indicates the mole fraction of constituent element of Ag, and x ranges from 0.01 to 0.85. In the process, cobalt nitrate and silver nitrate are used as raw materials, and ethylene glycol monomethyl ether is used as a solvent; a precursor solution with accurate stoichiometric proportion and uniform compositions is synthesized by chemical solution method, and film is coated on a glass substrate by a spin coater, and finally the Agx / (Co3O4) 1-x composite film is obtained by thermal decomposition and annealing. Silver nanoparticles are uniformly dispersed in a cobalt oxide matrix, and the diameter of the silver particle is 1- 500nm; and the film can observe the plasma resonance absorption peaks of metal particles at a wave band of 350-450nm, and the film has excellent photocatalytic properties under the irradiation of visible light.

The invention relates to flexible filamentous spherical porous amorphous nickel phosphate nanoparticles and a preparation method thereof, and particularly provides a method, which is simple, convenient and practical, low in cost, rapid and efficient, and template-free, for preparing the flexible filamentous spherical porous amorphous nickel phosphate nanoparticles; the product is obtained by taking nickel nitrate, sodium dihydrogen phosphate and sodium hydroxide, which are low in price and easy to obtain, as raw materials, taking a mixed solution of water and ethylene glycol as a solvent, andcarrying out a reaction at a certain temperature; the product is the spherical porous amorphous nickel phosphate nanoparticles which have an open skeleton structure and are formed by accumulation of filamentous particles. The flexible filamentous spherical porous amorphous nickel phosphate nanoparticles obtained by the method have the advantages of being high in yield, easy to collect, good in stability, large in specific surface area, high in catalytic activity, and the like, have good catalytic characteristic in catalytic degradation of methylene blue and a catalytic hydrogenation reaction of p-nitrophenol, and can be recycled for a plurality of times. Therefore, an important material basis is provided for practical applications such as catalysis, epoxidation, hydrogen addition reactions, absorption, pigment and ceramic production.

The invention provides a Co0.8Ni0.2TaO6 photocatalyst with a visible light response. The microstructure of the photocatalyst is porous micro/nano spheres of which the particle sizes are 5-10nm; and the diameters of the porous micro/nano spheres are 0.5-2 microns. The photocatalyst is prepared through sol-gel reaction, spray drying and burning of tantalum chloride, nickel acetate and cobalt nitrate as main reaction materials according to the stoichiometric ratio of a nickel element, a cobalt element and a tantalum element in the Co0.8Ni0.2TaO6. The preparation method is simple in preparation process, relatively low in cost, low in energy consumption; and the prepared photocatalyst has a good catalytic effect, has relatively high catalytic water decomposition efficiency under visible light radiation, and has potential application prospect in the field of hydrogen production from photocatalytic water splitting and water treatment.

The invention relates to nano-sized patternable environmental catalysis materials (metal/ semiconductor catalyst/adsorbing material) and a size preparation method thereof, belonging to the field of inorganic nano materials. The product surface is in a porous structure with uniform granularity; and the product has strong light absorbing ability, and can express a certain methanal degrading ability at the dark and illumination condition, and the performance of the Ag/TiO2/AlO3 is the highest. The prepared pattern has better visual effect; and the selectivity of a substrate is wide, and the substrate can be a high temperature resistant material, such glass, ceramic tile, stone, metal, ceramics and the like, and has wide application. The invention has simple operation and good repeatability, has low requirement on the complexity of environment and equipment, integrates practicability and artistry into a whole, purifies the environment, brings physical and mental pleasure, and is suitable for large-scale development and production so as to cope with the indoor environment pollution on the rise.

The invention discloses a preparation method of a Ni single atom doped cobaltosic oxide nano material and a product and application thereof. The nickel atom doped Co3O4 nano material is prepared by adopting a microwave hydrothermal reaction and subsequent heat treatment method. The preparation method comprises the following steps: firstly, synthesizing a Ni precursor solution by utilizing a microwave hydrothermal reaction, putting a proper amount of Ni precursor into a Co precursor solution, continuing the microwave reaction, and then putting the obtained product into a hydrogen atmosphere forheat treatment to obtain the nickel monatomic doped Co3O4 nano material. The obtained nano material has a large specific surface area, is used in the fields of formaldehyde gas detection, hydrogen preparation by photocatalysis of water and the like, and can increase the contact area between the material and reactants; and the defect mode of the nano material can be increased through nickel monatomic doping, a very important role is played in improving the electrical property and catalytic property of the material, the preparation method is simple, and the process conditions are easy to realize.

The invention relates to a method for controlling preparation of a platinum particle highly-dispersed mesoporous carbon-based compound material as a high-efficiency hydrogen-producing electrocatalyst,and the method comprises: 1) mixing 4-carboxyl porphyrin, zirconium tetrachloride, benzoic acid and N,N-diethyl formamide to obtain a platinum-loaded carrier; 2) dissolving the platinum-loaded carrier obtained in the step 1) and a certain amount of a platinum source in N,N-dimethyl formamide, water or a mixed solution of the N,N-dimethyl formamide and the water, heating to a certain temperature,and keeping the temperature for a certain time to obtain a platinum-loaded roasting precursor; 3) roasting the platinum-loaded roasting precursor obtained in the step 2) in an inert gas for carbonization; and 4) and treating the roasted product obtained in the step 3) with an acid (preferably hydrofluoric acid) to obtain the compound material. The platinum particle highly-dispersed mesoporous carbon-based compound material disclosed by the invention can be used as the high-efficiency hydrogen-producing electrocatalyst, and the nano-scale effect and the surface effect of high-dispersion platinum particles are utilized, so that the platinum particles are fully utilized, and the utilization rate of resources is greatly improved.