96results about How to "Improve redox performance" patented technology

The invention discloses a nitrogen-doped graphene catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: drying and dehydrating glucose and urea, and mixing with melamine, wherein the mass ratio of the urea to melamine is 2-4; uniformly grinding the mixture, and calcining the mixture into a muffle furnace at the temperature of 550 DEG C for 3 hours; cooling and grinding uniformly, adding the mixture into a tube furnace, introducing into nitrogen protection, calcining at the temperature of 850-1000 DEG C for an hour, thereby obtaining the nitrogen-doped graphene catalyst. According to the in-situ nitrogen-doped graphene disclosed by the invention, the used raw materials are low in price, the method is simple, the yield is high, and graphite-like nitrogen doped graphene with the highest ratio is obtained by changing the rate of the raw materials and the temperature, so that the catalyst has a good oxidation-reduction effect, and expensive Pt can be replaced to a certain degree.

The invention provides a method for preparing 2,6-dimethylnaphthalene by catalyzing naphthalene alkylation reaction with CoAPO-11 molecular sieve, relates to a method for preparing 2,6-dimethylnaphthalene, and is used for solving the problems that the traditional catalyst cannot simultaneously have high activity and high selectivity of 2,6-dimethylnaphthalene. The method comprises the steps of: activating the CoAPO-11 molecular sieve synthesized by an electrical heating method or microwave heating method for 2h, then mixing with naphthalene, alkylation reagents and solvent to prepare raw material liquid, and carrying out alkylation reaction to obtain 2,6-dimethylnaphthalene. According to the invention, the synthesized CoAPO-11 molecular sieve has higher catalytic reaction activity on naphthalene alkylation reaction, and higher selectivity of 2,6-dimethylnaphthalene; and the method is suitable for preparing 2,6-dimethylnaphthalene.

The invention discloses a preparation method of a collagen fiber immobilized tannin loaded nanometer zero-valent Fe-Ni bimetallic ball adsorption reduction material, which comprises the following steps: adding ultrapure water into collagen fibers, soaking overnight, adding tannin, stirring, filtering, dispersing in a crosslinking agent solution, regulating the pH value, crosslinking, filtering, washing, and drying to obtain a collagen fiber cured tannin material; dispersing the collagen fiber cured tannin material in water, adding a Fe < 3 + > solution or a Fe < 2 + > solution, adjusting the pH value, stirring and reacting to obtain a mixed solution, adding a Ni < 2 + > solution into the mixed solution, adjusting the pH value, continuously reacting, filtering and washing; re-dispersing theobtained material in a reducing agent solution, reducing at normal temperature, filtering, washing, repeatedly dehydrating with ethanol, and drying in vacuum to obtain the collagen fiber immobilizedtannin loaded nanometer zero-valent Fe-Ni bimetallic ball adsorption reduction material; the material can be applied to adsorption and separation of various heavy metals, and has ultrahigh adsorptioncapacity for certain metal ions.

The invention discloses a preparation method of a three-dimensional ordered macroporous carrier loaded heteropoly compound catalyst and belongs to the technical field of preparation of catalysts. The preparation method comprises the following steps of: adding tetraethoxysilane, a vanadium-containing compound and hydrochloric acid into a polystyrene colloidal crystal template; immersing and calcining the template to obtain a VOx-SiO2 three-dimensional ordered macroporous carrier; modifying the carrier; and finally, introducing a heteropoly compound to obtain the three-dimensional ordered macroporous carrier loaded heteropoly compound catalyst. According to the preparation method of the three-dimensional ordered macroporous carrier loaded heteropoly compound catalyst, disclosed by the invention, the catalyst has a proper duct structure and a relatively large specific surface area, so that the diffusing process of reactants and products is facilitated; and the oxidation-reduction quality of the catalyst can be improved by doping vanadium in the carrier, so that the catalyst shows high activity and high selectivity in catalyzing the oxidizing reaction of methylacrolein.

A cathode catalyst for a fuel cell is inexpensive and has high durability against methanol. A method of manufacturing and fixing the cathode catalyst, and a fuel cell including it, are disclosed. The cathode catalyst includes a compound selected from the group consisting of PdSn, PdAu, PdCo, PdWO₃, and mixtures thereof. The present invention can provide a non-platinum-based cathode catalyst as a substitute for a platinum catalyst, the cathode catalyst having a low cost and improved catalyst activity, thereby contributing to popular use of a fuel cell. In addition, since the cathode catalyst of the present invention has high durability against methanol and can thereby be used with a fuel in a high concentration, it can increase the energy density of a direct methanol fuel cell (DMFC).

The invention discloses a sludge active carbon adsorbing agent for sewage dephosphorization and a preparation method thereof. The adsorbing agent is prepared from 0.1 mass percent to 5.0 mass percent of pyrolusite powder and 95 mass percent to 99.9 mass percent of sludge active carbon, wherein the mass percent sum of the ingredients is 100 percent. The preparation method comprises the following steps of grinding sludge into sludge powder; uniformly mixing the pyrolusite powder and the sludge powder; adding composite activating agents into the mixed powder; uniformly stirring the mixture; after the ultrasonic treatment, performing activation in a baking oven; then, performing burning carbonization in a tubular furnace; after the cooling, washing the prepared sludge active carbon by water to a neutral state; performing drying, grinding and screening to obtain the sludge active carbon adsorbing agent. The sludge active carbon adsorbing agent and the preparation method solve the problem of poor adsorption performance of the existing sludge active carbon adsorbing agent, and has the advantages that the dephosphorization rate is higher; the preparation method is simple; the adsorption performance is much better than that of wood commercial active carbon used in the market; the price is relatively lower; high market competitiveness and popularization values are realized.

The invention discloses a preparation method of a supported medium and high temperature denitration catalyst. The method comprises the following steps: 1, dissolving a soluble active metal component precursor salt and a soluble auxiliary metal component precursor salt into deionized water to obtain a transparent impregnation solution; 2, impregnating a molecular sieve carrier for 6h-24h, filtering, drying at temperature of 80-120 DEG C for 12h-24h to obtain a catalyst precursor; 3, putting the catalyst precursor in a heat treatment furnace, heating to 300 DEG C-400 DEG C, calcining while introduction of air for 1h-3h, heating up to 600-800 DEG C, calcining for 2h-6h, and cooling to obtain the supported medium and high temperature catalyst. The supported medium and high temperature denitration catalyst prepared by the method has high strength, is not easy to pulverize, has long service life, and has low catalyst bulk density. The catalyst has a NO conversion rate of 85% or more at a suitable application temperature of 300 to 500 DEG C.

The invention discloses an anion health-care viscose fabric. The anion health-care viscose fabric is formed by weaving yarns which are formed by blending anion health-care viscose and cotton fibers; a preparation technology of the anion health-care viscose fabric comprises the steps that sodium alginate colloid is prepared; anion powder is added into the sodium alginate colloid, and uniform stirring is conducted, colloid containing the anion powder is obtained; bamboo fibers, taxus chinensis fibers and microporous lignocellulose are added into sodium hydroxide for soaking, CS2 is added, a stirring reaction is conducted, and a viscose solution is obtained; the colloid containing the anion powder is added into the viscose solution to be stirred to be uniform, grinding is conducted, and a viscose mixed solution before spinning is obtained; filtering, defoaming, curing, spinning, desulfurization, water washing, oiling and drying are conducted, and the anion health-care viscose fabric is obtained. The anion health-care viscose fabric has the advantages of being good in skin adaptability, moisture absorption and liberation and air permeability, resistant to bacteria, healthy, green, environmentally friendly and the like.

The invention discloses a domestic-wastewater efficient nitrogen-and-phosphorus-removal treatment method. The method includes the following steps that domestic wastewater is oxidized and enters a filtering pond filled with quartz sand and limestone for filtering; the filtered wastewater enters an aeration zeolite biological tank and is subjected to adsorption nitrogen-and-phosphorus-removal treatment through zeolite; the treated wastewater is injected into a flocculation settling pond for flocculation settling treatment; the water obtained after flocculation settling treatment enters a phosphorus-removal settling pond for phosphorus-removal treatment, the treated water is chlorinated, and purified water is obtained. By means of the method, nitrogen and phosphorus in domestic wastewater can be effectively removed, it can be prevented that domestic wastewater is directly discharged and pollutes the environment, secondary pollution can be avoided, and the treatment cost is low.

The invention discloses a nano NiO-CeO-Al2O3 oxygen carrier catalyst for hydrogen production by reforming water vapor. The nano NiO-CeO-Al2O3 oxygen carrier catalyst has reduction-oxidation performance and comprises the following components by mass percent: 10-30% of Ni, 0.5-10% of CeO and 60-85% of Al2O3. The invention further discloses a method of preparing the nano-powder catalyst. According to the method, the rising of pH value of reaction solution is controlled through coprecipitation. The nano NiO-CeO-Al2O3 oxygen carrier catalyst has the advantages as follows: the reduction-oxidation performance and heat stability are good; the cooperation of multiple surface active centers is brought into full play; the specific surface area is relatively large; the hydrogen productivity is relatively high; carbon deposition during the reaction process can be efficiently inhibited. The main raw materials adopted by the nano NiO-CeO-Al2O3 oxygen carrier catalyst are low-cost and abundant compounds. The preparation process of the nano NiO-CeO-Al2O3 oxygen carrier catalyst is simple and controllable, does not relate to complex equipment and complex procedures, and is low in cost and environmental-friendly.

The invention discloses a low-vanadium-content wide-active-temperature-window denitration catalyst, which is made from raw materials of 0.05-0.2 by weight of ammonium metavanadate, 0.1-3 parts by weight of ammonium metatungstate or a mixture of 0.1-3 parts by weight of ammonium metatungstate and 0.1-10 parts by weight of ammonium molybdate, 60-80 parts by weight of TiO2, 10-20 parts by weight of an additive, and 15-30 parts by weight of deionized water. Vanadium in the denitration catalyst is controlled at a low content, so that the cost of the catalyst is reduced at a certain degree, and the low vanadium content in the range doesn't cause secondary pollution. Through introduction of the new additive, vanadium in the denitration catalyst is uniformly dispersed, so that vanadium active sites are formed on the surface of the catalyst as much as possible, and the use ratio of vanadium is increased. Furthermore, through introduction of the new additive, the surface acidity and redox performance of the catalyst are improved, thereby improving the performance of the catalyst. The testing result of a pilot-plant test system for simulating industrial smoke and the industrial actual operation of demonstration projects show that the catalyst can well satisfy the operating requirements of variable load conditions in a coal-fired power plant.

The invention relates to the technical field of artificial quartz, and especially relates to an explosion-proof and self-cleaning artificial quartz plate and a preparation method thereof. The productcomprises a self-cleaning layer, an antibacterial layer, a fireproof layer, a buffer layer, an explosion-proof layer, and a substrate layer; the explosion-proof layer is arranged on the substrate layer, the buffer layer is arranged on the explosion-proof layer, the fireproof layer is arranged on the buffer layer, the antibacterial layer is arranged on the fireproof layer, and the self-cleaning layer is arranged on the antibacterial layer; the substrate layer and the explosion-proof layer are internally provided with several fixing pieces, and the fixing pieces have downward groove shaped structures; and several through holes are opened at the bottom of the plate of the substrate layer and are arranged at the length direction, and the cross sections of the through holes are any one of circle, rectangle or isosceles triangle. The through holes are arranged in order to play pressure buffering effects, reduce weight of quartz plates, and reduce production and transport costs; at the same time the problem that the artificial quartz plate is easy to fragment without stain resistance and antibacterial property, and the like is also solved.

The invention provides an oxidoreduction responsive nanoparticles based on bisimidazole ionic liquids and a preparation method of the oxidoreduction responsive nanoparticles, and belongs to the field of materials. According to the method, the crosslinking copolymerization is carried out in a selective solvent in one step by utilizing bisimidazole ionic liquid monomers and a cross-linking agent containing disulfide bonds as raw materials, so that the nanoparticles with oxidoreduction responsiveness are prepared. After the stimulating responsiveness of the nanoparticles is analyzed by utilizing a dynamic light scattering experiment, the result shows that the nanoparticles based on bisimidazole ionic liquids have the good oxidoreduction responsiveness, so that the nanoparticles provided by the invention have wide application prospects in the fields of medicine release, enzyme immobilization, catalysis and the like.

The invention discloses a W18O49/g-C3N4 composite S type heterojunction photocatalyst and a preparation method thereof. The preparation method comprises the following steps of S1, providing a tungsten source, an organic compound and absolute ethyl alcohol, S2, calcining the organic compound to obtain the g-C3N4 nanosheet, S3, dispersing the g-C3N4 nanosheets in the absolute ethyl alcohol, and stripping through an ultrasonic probe to obtain a g-C3N4 suspension, S4, dispersing the tungsten source into the absolute ethyl alcohol to obtain a yellow solution, and S5, dropwise adding the yellow solution into the g-C3N4 suspension, and carrying out hydrothermal reaction treatment, so as to obtain the W18O49/g-C3N4 composite S type heterojunction photocatalyst. The g-C3N4 nanosheet is of a porous structure. In the W18O49/g-C3N4 composite S type heterojunction photocatalyst, the mass ratio of W18O49 to g-C3N4 is (2 to 5): 10. According to the preparation method disclosed by the invention, more catalytic activity centers can be provided, W18O49 is grown on g-C3N4 in situ so as to obtain an S-type heterojunction, a W18O49/g-C3N4 composite system is endowed with better oxidation-reduction capability, and the photocatalytic hydrogen production efficiency and photocatalytic stability are improved.

The invention discloses a multifunctional catalyst, and a preparation method and application thereof. A mixture of zirconium hydrogen phosphate and titanium trioxide is taken as a carrier, a cerium-manganese-iron composite oxide is taken as a catalytic active component, and strontium oxide is taken as a cocatalyst. Based on the mass of the carrier, the mass percentage of the active component is 2-4%, and the mass percentage of the cocatalyst is 0.5-1%. The preparation method comprises the following steps: uniformly stirring the active component, a cocatalyst precursor solution and the catalystcarrier, performing aging, and then carrying out extrusion molding, drying, and roasting. The catalyst is environmentally friendly, can remove NOx in diesel engine tail gas and synergistically catalyze and remove CO and HC at a low temperature, and has a wide active temperature interval and low SO2 oxidation efficiency. The denitration efficiency of the catalyst is higher than 95% and reaches upto 100% in a temperature range of 150-350 DEG C, and the oxidation efficiency of CO and HC is higher than 90% and reaches up to 98.7% and 97.6%, respectively. The catalyst is high in cost performanceand particularly applicable to the field of low-speed diesel engine tail gas purification.

The invention belongs to the technical field of functional and intelligent high polymer materials, and particularly relates to a method for preparing a double-responsiveness nanometer microsphere through mercaptan-alkene visible light emulsion polymerization and the double-responsiveness nanometer microsphere. According to the invention, a thiol compound, an acrylic acid compound and a vinyl ethercompound are used as monomers, and thiol-alkene click chemistry and a visible light initiated emulsion polymerization technology are adopted. By accurately controlling the proportion of the monomers,the double-responsiveness polymer nano-microsphere is successfully synthesized. The preparation method disclosed by the invention has the main advantages of simple process, low cost, rapidness, highefficiency, safety, environmental protection, low energy consumption and the like. The prepared and synthesized dual-responsiveness polymer nano microsphere not only has a semi-crystalline structure,but also has dual-response characteristics of pH and oxidation reduction, and a preparation technology which has a good prospect and can be widely applied to the fields of nano carriers and biologicalmaterials is provided.

The invention belongs to the technical field of oxygen carriers, and discloses a chemical-looping methane partial oxidation oxygen carrier, a preparation method and applications thereof, wherein the oxygen carrier is obtained by conducting B-site doping on LaMnO3 with Fe and Co elements, the general formula of the oxygen carrier is LaMn1-x-yFexCoyO3, x is larger than 0 and smaller than 1, and y islarger than 0 and smaller than 1. The preparation method adopts a sol-gel method and comprises the following steps: taking lanthanum nitrate, cobalt nitrate, ferric nitrate and manganese nitrate as precursors, and preparing a solution from the precursors and citric acid; converting the transparent sol into a viscous gel through evaporation; and aging and roasting to obtain a target product. The oxygen carrier provided by the invention has characteristics of high conductivity of ions and electrons, good thermal stability, sintering resistance, oxygen supply capacity, high activity, small carbon deposition amount and strong oxygen storage-oxygen release capacity, can accelerate the rate of a reaction for preparing synthesis gas through partial oxidation of methane, and can be carried out under a high airspeed condition to obtain high methane conversion rate.

The invention discloses a ceramic membrane denitration and dioxin removal catalyst taking sludge and steel slag as raw materials and a preparation method thereof, and belongs to the field of waste product resource utilization and environment-friendly catalysis. According to the catalyst, a ceramic membrane prepared from polluting steel slag discharged from the steelmaking industry, domestic sludgeof urban sewage treatment plants, titanium source powder and a forming agent solution is used as a carrier, a tungsten-zirconium composite oxide is used as a catalytic active component, and a nickel-cobalt composite oxide is used as a cocatalyst. The ceramic membrane catalyst not only can realize resource utilization of industrial waste slag steel slag and domestic sludge of residents, but also is environment-friendly, and can realize denitration and dioxin removal at the same time.

The invention relates to a method for producing Alpha, Alpha-dimethyl phenyl carbinol, and provides a new technology for producing Alpha, Alpha-dimethyl phenyl carbinol by conducting multi-phase catalytic decomposition to cumene hydroperoxide. In the method, the cumene hydroperoxide is adopted as the material; in a reaction system, the weight concentration of the cumene hydroperoxide is 1-60 percent, under the conditions that the reaction temperature is 30-100 DEG C, the system pressure is 0.01-1.0MPa and the liquid phase airspeed is 0.5-8hr to 1, the material contacts and reacts with a catalyst to produce the Alpha, Alpha-dimethyl phenyl carbinol, wherein the catalyst comprises the following components by weight percentage: 30-90 percent of manganese oxides, 0.1-10 percent of at least one of copper oxide, cobalt oxide or ferric oxide, 0.1-10 percent of at least one oxide selected from alkali metal oxides, and 5-60 percent of alumina support. The technical scheme can better solve the problems and can be applied to the industrial production of the Alpha, Alpha-dimethyl phenyl carbinol.

The invention relates to an oxide catalyst for producing Alpha-Alpha-dimethylphenyl carbinol and a preparation method thereof, and mainly solves the technical problem that a product contents sulphur when sodium sulfide and sodium sulfite are used as reducers in the prior art. The oxide catalyst comprises the following components by weight percentage: 30-90% of manganese oxide, 0.1-10% of at leastone oxide out of copper, cobalt or iron, 0.1-10% of at least one oxide out of alkali metal oxides, and 5-60% of alumina carriers. The technical scheme for preparing the catalyst and a corresponding preparation method better solves the problem and can be applied to the industrial production of the Alpha-Alpha-dimethylphenyl carbinol.

The invention relates to the technical field of medicinal chemistry, in particular to a formononetin derivative as well as a preparation method and application thereof. The invention provides a formononetin derivative. The formononetin derivative has a structure as shown in a formula I which is described in the specification. According to the invention, by utilizing the excellent reactivity, imaging capacity, binding capacity, oxidation-reduction capacity and good antitumor activity of polypyridine ruthenium complex, the polypyridine ruthenium complex is introduced to formononetin, and the formononetin is structurally modified, so that the antitumor activity is further improved.