11results about How to "Rich activity" patented technology

The invention belongs to the technical field of catalysts, and discloses an iron-tantalum bimetal organic framework catalyst and a preparation method and application thereof. The iron-tantalum bimetal organic framework catalyst takes foamed nickel as a substrate, and a needle-shaped iron-tantalum bimetal organic framework material is uniformly loaded on the foamed nickel substrate. The preparation method comprises the following steps: carrying out acid etching on foamed nickel, then washing with ethanol and water in sequence, and drying; the preparation method comprises the following steps: uniformly dispersing water-soluble ferric salt and tantalum chloride in water to obtain a solution A; 2-hydroxyterephthalic acid is dissolved in a mixed solvent composed of absolute ethyl alcohol and N, N-dimethylformamide, and a solution B is obtained; dropwise adding the solution B into the solution A to obtain a solution C; obliquely placing foamed nickel into a hydrothermal reaction kettle, adding the solution C, completely soaking the foamed nickel, and reacting at 80-125 DEG C for 8-12 hours; and taking out the foamed nickel, washing with water, and drying to obtain the target catalyst. The catalyst prepared by the invention can realize low overpotential and excellent stability when being used for water electrolysis oxygen evolution reaction.

The invention provides an agricultural portulaca oleracea enzyme as well as a preparation method and application thereof, and belongs to the technical field of agricultural biological products. The method comprises the following steps: crushing fresh purslane plants, mixing the crushed purslane plants with brown sugar and tap water according to a mass ratio of 5: 1: 20, sequentially carrying out aerobic fermentation for 4-6 weeks and anaerobic fermentation for 6-8 weeks under a dark condition at 20-30 DEG C, and carrying out solid-liquid separation after the fermentation is finished, so as to obtain filtrate, namely the agricultural enzyme. The pH value of the enzyme is 3.5-4.5, the organic matter content is larger than or equal to 30 g / L, and the enzyme contains salicylic acid, indoleacetic acid, lactic acid, asparagine and rich mineral elements. The product can be used in the planting industry, is applied in an irrigation mode after being diluted, is suitable for vegetable seedling raising and green cultivation of crops such as tomatoes and pakchoi, and can effectively improve the seedling strengthening index, yield and fruit quality. According to the method, high-value resource utilization of the purslane is achieved, and good ecological and economic benefits are achieved.

The application relates to a method for improving the performance of lithium batteries by in-situ growth of carbon nanofibers on a silicon-carbon negative electrode through plasma induction, and belongs to the technical field of new materials and functional materials. The silicon-carbon negative electrode material is subjected to surface activation through plasma pretreatment technology, and then carbon nanofibers are in-situ grown through chemical vapor deposition to construct a three-dimensional conductive network structure. The plasma-assisted chemical vapor deposition technology is adopted, the silicon-carbon surface activated by plasma is used as a substrate, and in-situ growth is carried out to obtain uniformly distributed carbon nanofibers, so that a three-dimensional conductive composite structure closely combined with silicon-carbon particles is formed, and the high-rate cycle stability of the lithium ion battery is effectively improved.

The application discloses a preparation method of a high-entropy MXene composite diaphragm coating, which comprises the following steps: in the first step, 2g of HE-MAX phase raw material powder is gradually added into a reaction container containing an HF solution to perform a chemical etching reaction, and meanwhile, the sample is magnetically stirred at 55 DEG C for 72 to 96h; in the second step, the obtained HE-MXene suspension is placed into a centrifugal tube, and the precipitate is collected by high-speed centrifugation, and the deionized water and anhydrous ethanol are repeatedly cleaned until the solution is close to neutral; in the third step, the obtained precipitate is vacuum dried at 60 DEG C for 12h to obtain HE-MXene nanosheet powder; in the fourth step, the HE-MXene and two-dimensional layered material powder are weighed according to a weight ratio of 7:3, and after grinding, they are dissolved into deionized water and stirred to prepare an HE-MXene suspension; in the fifth step, after magnetic stirring is used until the mixed state is reached, vacuum filtration is performed; in the sixth step, the obtained HE-MXene / two-dimensional layered material@PP is placed in a vacuum environment and dried at 40 DEG C for 6h, and finally, the modified diaphragm is cut into a disc with a diameter of 18mm.

The invention discloses ZIF-8-Fe / P-g-C3N4 / graphite-like carbon gel microspheres as well as a preparation method and application thereof, and relates to the technical field of environmental and food pollutant treatment. The preparation method comprises the following steps: firstly, carrying out high-temperature calcination treatment on graphite-like carbon subjected to acid treatment, ZIF-8-Fe, urea and hydrophosphate to prepare a ZIF-8-Fe / P-g-C3N4 / graphite-like carbon composite material with a high specific surface area, a hierarchical porous structure and rich adsorption sites, and then carrying out a cross-linking reaction on sodium alginate and calcium ions to prepare the ZIF-8-Fe / P-g-C3N4 / graphite-like carbon gel microspheres. The prepared ZIF-8-Fe / P-g-C3N4 / graphite-like carbon gel microspheres not only can utilize the porous structure and rich active sites to enrich PAT, but also can perform photocatalytic degradation on PAT under the excitation of ultraviolet light, the treatment effect on PAT is good, and the material is easy to separate and recover and good in stability.

The invention discloses a thermal oxidation resistant boron-nitrogen co-doped carbon catalyst as well as a preparation method, a regeneration method and application of a self-template of the thermal oxidation resistant boron-nitrogen co-doped carbon catalyst. The catalyst is prepared by taking traditional Chinese medicine licorice root residues as a self-template carbon skeleton precursor, mixing the self-template carbon skeleton precursor with urea and boric acid according to a mass ratio of 1: 1: 1, and performing one-step pyrolysis in an air atmosphere. According to the preparation method, licorice root residue endogenous minerals are used as a template, and a boron-nitrogen atom covalently anchored stable carbon skeleton is successfully constructed under the fluxing and lattice stabilization effects of boric acid, so that the carbon skeleton can tolerate aerobic calcination at the high temperature of 700 DEG C. The catalyst can be used for efficiently activating peroxymonosulfate, and can be used for quickly degrading and deeply mineralizing a plurality of organic pollutants such as sulfonamides, tetracyclines and phenols in a wide range of pH (Potential of Hydrogen) 111. The method realizes treatment of wastes with wastes, overcomes the technical bottleneck that the carbon-based catalyst is difficult to thermally regenerate at high temperature, has the characteristics of high activity, long service life and low cost, and has a wide application prospect in the field of advanced treatment of organic pollutants in water.

The invention belongs to the technical field of catalyst preparation, and relates to a simple preparation method and application of a mesoporous hydrogenation catalyst carrier. The preparation method comprises the following steps: adding aluminum nitrate nonahydrate and terephthalic acid into N, N-dimethylformamide, and uniformly mixing to obtain a mixed solution A; heating the mixed solution A in a sealed state, and carrying out hydrothermal reaction; after the reaction is finished, centrifuging and washing to obtain an MIL-53 precursor; and calcining the MIL-53 precursor to obtain the mesoporous carrier. The preparation process of the mesoporous hydrogenation catalyst carrier provided by the invention does not need complex operations such as acid pickling and a template method, and the preparation method is simple in process, economical and efficient. According to the mesoporous carrier prepared by the method, the aperture can reach 20-30nm, mass transfer is more facilitated, and the catalytic activity is improved. The mesoporous hydrogenation catalyst carrier has the advantages of high mesoporous rate and high catalytic activity, can be recycled for multiple times, and provides a new thought for preparation and application of the mesoporous hydrogenation catalyst carrier.

The invention discloses a cerium-zirconium solid solution / manganese-based oxide honeycomb catalyst as well as a preparation method and application thereof, and relates to the technical field of novel materials for environmental catalysis. The catalyst disclosed by the invention is formed by mixing cerium-zirconium solid solution loaded silicate clay and natural manganese ore and then carrying out high-temperature calcination; the mass ratio of the cerium-zirconium solid solution to the silicate clay is (0.5-2): 1, and the molar ratio of zirconium to cerium is (0.15-0.35): 1; and the mass of the manganese-based oxide accounts for 25-77% of the total mass of the catalyst. An alkaline ureido silane coupling agent is grafted to the surface of silicate clay, cerium and zirconium hydroxide precursors are generated on the surface of a silicate clay carrier through in-situ precipitation, then a cerium-zirconium solid solution precursor / silicate clay compound and a manganese ore mixture are subjected to high-temperature calcination forming, and the non-noble metal monolithic honeycomb catalyst is prepared. The honeycomb catalyst prepared by the invention has excellent chlorine poisoning resistance and low-temperature catalytic activity.

The invention relates to the technical field of efficient catalysts and prevention and control of atmospheric pollutants, in particular to a wide-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: adding deionized water and a dispersing agent into a reaction kettle, stirring after heating, then simultaneously injecting a salt solution and a precipitator solution into the reaction kettle, continuously stirring and mixing the solutions after charging, and filtering, washing and drying after aging to obtain precursor powder; calcining the precursor powder in an N2 atmosphere to obtain calcined powder; and putting the calcined powder into a mixed aqueous solution of ammonium metavanadate and ammonium heptamolybdate, carrying out water bath stirring reaction, drying, and calcining to obtain the wide-temperature denitration catalyst. The wide-temperature characteristics of low-temperature efficient denitration and high-temperature stable denitration of the catalyst are achieved through active component dispersion, layered structure regulation and control and high-temperature and low-temperature active site collaborative construction, and the catalyst effectively adapts to the working condition characteristic that the temperature of industrial flue gas fluctuates greatly.

The invention provides a bimetallic composite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: smelting flue gas is subjected to plasma strengthening and then is in contact with the bimetallic composite catalyst; the smelting flue gas contains chlorobenzene and / or dioxin; under the condition that the smelting flue gas contains chlorobenzene, the concentration of the chlorobenzene in the smelting flue gas is 50-500ppm; under the condition that the smelting flue gas contains the dioxin, the concentration of the dioxin in the smelting flue gas is not higher than 20 ng TEQ / m < 3 >. The technical problems that in the common technology, the degradation efficiency of CVOCs such as chlorobenzene is insufficient, and synchronous and efficient degradation of chlorobenzene and dioxin is difficult to achieve at the same time are solved, efficient mineralization of chlorobenzene is achieved through multi-path coupling, and meanwhile efficient adsorption and deep degradation of dioxin are synchronously achieved.

This invention discloses a composite separator, its preparation method, and its applications, belonging to the field of new energy materials technology. The composite separator provided by this invention includes a substrate layer and a composite coating disposed on at least one surface of the substrate layer; the composite coating includes a two-dimensional amorphous nanoscale filler, comprising a first filler, a second filler, and a third filler; the first filler is boron nitride; the second and third fillers are independently selected from at least one of MoS2, WS2, V2O5, MoSe2, MXene, graphene, and TiS2; and the second and third fillers are different. The composite separator provided by this invention exhibits excellent electrolyte wettability, puncture resistance, heat shrinkage resistance, and mechanical strength. This invention also provides a preparation method and applications of the above-mentioned composite separator.