7results about How to "Increase electron density" patented technology

This application discloses a method for preparing radiation-shielding mortar based on lead-zinc tailings. By crushing and density sorting lead-zinc tailings containing barite, the synergistic effect of high-density and low-density components is rationally utilized. On this basis, functional components such as rare earth tungsten composite oxide powder, boron-containing zirconium complex modifier, calcium aluminate, quasi-crystalline rare earth silicate powder, and graphene oxide dispersion are introduced to construct a radiation-shielding mortar system with high density, multi-energy-level radiation absorption capacity, and excellent mechanical properties. This effectively improves the mortar's attenuation capacity for various types of radiation such as gamma rays and neutron rays. At the same time, the quasi-crystalline structure and the micro-enhancing effect of graphene oxide significantly reduce the internal porosity of the material and improve the interfacial bonding state. Thus, while realizing the high-value utilization of lead-zinc tailings resources, it overcomes the problems of insufficient radiation shielding efficiency, difficulty in balancing mechanical properties and durability, and low level of industrial solid waste utilization in existing radiation-shielding mortars.

This application relates to the field of catalyst technology, disclosing an electron-rich Pd nanocatalyst, its preparation method, and its application. The electron-rich Pd nanocatalyst comprises a sheet-like Mg(OH)₂ support and Pd nanoparticles uniformly loaded on the sheet-like Mg(OH)₂ support; wherein the thickness of the Mg(OH)₂ sheet is less than 2 nm; and the average particle size of the Pd nanoparticles is less than 4 nm. The preparation method includes dispersing the Mg(OH)₂ support in water, sequentially adding a palladium source and urea, refluxing at 55-65°C to obtain a precursor solution; adding a reducing agent to the precursor solution to carry out the reaction, collecting the solid deposit, washing, and drying to obtain the final product. This application, by regulating the electronic structure of the Pd nanoparticles, significantly increases the electron density on their surface, increasing the repulsion of reaction products, weakening the adsorption of reaction products on the catalyst surface, avoiding poisoning of the catalyst active sites, and improving the reactivity and selectivity of the Pd nanocatalyst for the hydrogenation of nitrile compounds at low temperatures.

This invention relates to a plasma generator based on a dense microporous material catalysis, belonging to the field of low-temperature plasma technology. The plasma generator contains at least one discharge unit, which includes a first electrode, a microporous ceramic medium, and a second electrode. The first electrode is used to connect to a power source, and the second electrode is used for grounding. The microporous ceramic medium is used to adsorb gas molecules and active particles generated by the plasma discharge. This invention generates micro-discharge in a dense microporous medium, which has an extremely high specific surface area. When gas passes through, it is adsorbed onto the surface of the micropores in the medium. Similarly, active substances in the plasma are adsorbed onto the surface of the micropores in the medium. This improves the contact efficiency between short-lived, highly active particles and free radicals in the plasma and the reactants, promotes surface catalytic reactions, and improves the overall efficiency of the device.

The invention discloses a method for mineralizing marine diatom memory-losing shellfish poison through hydroxyl free radicals and an offshore device, and relates to marine shellfish poison treatment. The method comprises the following steps: culturing nitzschia in a control enclosure, extracting a nitzschia solution, pumping the nitzschia solution into a main pipeline, generating a high-concentration OH solution by OH solution generation equipment, injecting the high-concentration OH solution into a liquid / liquid mixing and dissolving device, cutting and mixing the OH solution and the nitzschia solution at a throat pipe, crushing the mixture into a huge amount of fine liquid drops, rapidly mineralizing memory-losing shellfish poison by OH at the moment of collapse of the liquid drops, and killing the nitzschia at the same time; one path of OH-killed algae is directly injected into the treatment I enclosure through a main pipeline I, the other path of OH-killed algae is introduced into a flocculation stirring tank through a main pipeline II to form flocs, the flocs are injected into the treatment II enclosure after forming flocs at a water conveying section, and the flocs are pumped into a flocs storage box after settling to the bottom of the enclosure; the sea water in the enclosure of the treatment I and the treatment II is pumped into a detection branch pipeline, and the concentration of memory-losing shellfish poison and the density of algae in the enclosure are monitored on line in real time. The device inhibits the transmission of the memory-losing shellfish poison along the marine food chain, and ensures the marine ecological safety.

This invention discloses a method for preparing gold-coated silica nanoparticles with an egg yolk shell structure. The method involves adding trisodium citrate solution, tannic acid solution, and sodium carbonate solution to a flask and stirring. After heating, chloroauric acid solution is added, and stirring continues while maintaining a certain temperature to obtain a gold nanoparticle solution. The gold nanoparticle solution, anhydrous ethanol, ammonia, and hexadecyltrimethylammonium bromide are then added to the flask, stirred, and resorcinol is added, with continued stirring. After the reaction, formaldehyde is added dropwise, followed by tetraethyl orthosilicate. The reaction product is washed multiple times with deionized water by centrifugation, dried overnight in an oven, calcined, and then washed multiple times with deionized water by centrifugation and dried in an oven to obtain gold-coated silica nanoparticles with an egg yolk shell structure. This one-pot sol-gel method is low-cost, simple, and rapid, producing gold particles with uniform morphology, a uniform silica shell thickness, and a large internal space within the egg yolk shell.

The invention provides a silsesquioxane porous material with a near-infrared light catalytic effect as well as a preparation method and application of the silsesquioxane porous material. The preparation method of the silsesquioxane porous material comprises the following steps: (1) in a solvent A, under the action of piperidine, enabling (3, 5, 5-trimethylcyclohex-2-alkenyl) malononitrile to react with a donor compound to obtain a D-A compound; (2) dissolving octavinyl silsesquioxane and the D-A compound obtained in the step (1) in a solvent B, adding a catalyst, uniformly stirring, and reacting; after the reaction is finished, cooling, filtering and washing to obtain a solid; and carrying out Soxhlet extraction on the obtained solid, and carrying out vacuum drying on the obtained solid to obtain the silsesquioxane porous material with the near-infrared light catalytic effect. The prepared silsesquioxane porous material has the advantages of wide absorption of near-infrared light, high light absorption and conversion efficiency, high catalytic activity, chemical stability and water stability.

The present application discloses a kind of condensed ring aromatic hydrocarbon hydrogenation catalyst and its preparation method and application.The catalyst includes porous carrier, active metal component and auxiliary component, the active metal component is selected from at least one of La system, group VIB or group VIII metal element, the auxiliary component is selected from at least one of group IIA metal element, the catalyst, with X-ray photoelectron spectroscopy characterization, metal component M a+ (a>1) is reduced to M (a‑1)+ The ratio of M a+ Total reduction of at least 80%, preferably at least 90%.The catalyst of the present application is used for condensed ring aromatic hydrocarbon hydrogenation reaction, especially naphthalene and naphthalene hydrogenation reaction, with the characteristics of improving the conversion rate of reactants, the selectivity of target product.