133 results about "Surface reaction" patented technology

The invention relates to the technical field of biomedical materials, in particular to a preparation method of TPP-mediated mitochondrial-targeted cerium-doped antioxidant carbon quantum dots, which comprises the following steps: mixing citric acid, urea and cerium salt serving as raw materials, and reacting by adopting a hydrothermal method to synthesize the cerium-doped carbon quantum dots; then triphenylphosphine is grafted to the surface of the cerium-doped carbon quantum dot through an amide method, separation and purification are carried out after the reaction is completed, the target carbon quantum dot is obtained, and the cerium element in the cerium salt is used for endowing the carbon quantum dot with an anti-oxidation function. The carbon quantum dots prepared by the method are accurate in mitochondria targeting and strong in oxidation resistance, the preparation process is simple, convenient, environment-friendly and large-scale, and the product is uniform in particle size, stable in fluorescence, good in biocompatibility and wide in application prospect in the field of biomedicine.

The invention discloses modified egg shell powder with a high-activity porous structure and a preparation method of the modified egg shell powder. The material is prepared by the following steps: cleaning egg shells, calcining for 15-40 minutes in an air atmosphere of 300-400 DEG C, grinding and grading, and carrying out surface modification by a silane coupling agent containing amino groups and / or epoxy groups. The BET specific surface area of the modified egg shell powder is larger than 5 m / g, and the surface water contact angle is larger than 90 degrees. Comparison experiments prove that the eggshell powder treated by the method disclosed by the invention has obviously improved surface reaction activity, a porous structure and fundamentally improved interface bonding force with a polymer matrix. The material can be used as a functional filler in the field of composite materials.

Methods and apparatuses for precise trimming of silicon-containing materials are provided. Methods involve oxidizing silicon-containing materials and thermally removing the oxidized silicon-containing materials at particular temperatures for a self-limiting etch process. Methods also involve a surface reaction limited process using a halogen source and modulated temperature and exposure duration to etch small amounts of silicon-containing materials. Apparatuses are capable of flowing multiple oxidizers at particular temperature ranges to precisely etch substrates.

The invention discloses a preparation method of TiO2 powder with a rutile and anatase core-shell structure, and particularly relates to the technical field of photocatalytic material preparation. According to the method, rutile phase TiO2 powder is used as a core material, a titanate intermediate layer is formed on the surface of a particle through an accurately controlled hydrothermal alkali treatment process, and then a surface layer phase is converted into an anatase phase through acid pickling treatment and controllable heat treatment, so that a complete core-shell heterojunction structure is constructed. The process flow is relatively simple, the cost is controllable, the phase structure conversion rate is high, and the shell thickness can be accurately regulated and controlled. The obtained TiO2 core-shell structure powder has excellent structural stability of a rutile phase and high surface reaction activity of an anatase phase, and shows remarkably enhanced photocatalytic degradation performance under the condition of ultraviolet irradiation, and the catalytic efficiency of the TiO2 core-shell structure powder is greatly improved compared with that of single rutile phase TiO2; and a new process method is provided for large-scale preparation of efficient photocatalytic materials.

The invention discloses a preparation method and system of a modified electrode material, and the method comprises the steps: an electrode material moves into a modification tank, the modification tank contains a modification solution with continuously changing concentration, and the electrode material is always soaked in the modification solution when passing through the modification tank; after leaving the modification tank, the electrode material is cleaned, dried and subjected to heat treatment, and the modified electrode material with continuous electrochemical activity change is obtained. According to the invention, by controlling the continuous change of the reaction active sites on the surface of the electrode material, the electrochemical activity of the reaction sites is fully utilized, the electrochemical activity change is concentrated on the same electrode material, and the tedious process caused by splicing of multiple sections of electrodes is also avoided.

The application provides a regeneration method of halogenated nitrobenzene continuous hydrogenation catalyst, and relates to the technical field of fixed bed halogenated nitrobenzene hydrogenation. The regeneration method mainly comprises the following steps: using alcohol, alkali, petroleum ether and ethyl acetate to preliminarily clean the bed layer, removing azo compounds and other pollutants on the surface of the catalyst by using the special properties of ionic liquids, and then completing the regeneration of the catalyst through the steps of pickling, precious metal solution treatment and drying. The application overcomes the defects of the prior art, has the advantages of simple operation, mild conditions and low cost, realizes the in-situ removal of surface impurities such as reaction intermediates and azo compounds on the catalyst surface without damaging the structure of the catalyst and disassembling the catalyst, further supplements the lost metal active components, and can effectively restore the catalyst activity.

The application belongs to the technical field of photocatalytic CO2 cycloaddition reaction, and particularly relates to a preparation method of a vacancy defect layered bismuth semiconductor material and application of the vacancy defect layered bismuth semiconductor material in photocatalytic CO2 cycloaddition reaction. The material is based on a bismuth semiconductor material with a Sillen-Aurivillius structure, and a defect site is constructed by vacancy regulation of the material. Low-valence metal ions exposed by the vacancy defect can be used as Lewis acid sites to adsorb and activate epoxides, and the defect site can promote separation of photo-generated carriers, thereby enhancing surface reaction kinetics and effectively improving photocatalytic activity of the material, and finally promoting photocatalytic CO2 cycloaddition reaction performance.

This invention belongs to the field of solid oxide electrolysis cell technology, and discloses a cobalt-iron co-doped cerium-based cathode material and its preparation and application. Preparation method: 1) A mixed solution of cobalt precursor, iron precursor, cerium precursor, and gadolinium precursor is prepared using water; glycine is added as a complexing agent, and the mixture is homogeneous; the mixture is heated to 300-400℃, stirred, and evaporated until a spontaneous combustion reaction occurs, and the precursor powder is collected; 2) The precursor powder is heat-treated in air to obtain the cobalt-iron co-doped cerium-based cathode material. The iron and cobalt co-doping in this invention produces an interaction: iron facilitates the formation of Ce. surf. 3+ -Oxygen vacancy defects enhance CO2 adsorption activation, while cobalt lowers the oxygen ion migration barrier and increases electronic conductivity, simultaneously improving surface reaction kinetics and bulk transport properties. The cathode material of this invention, used in solid oxide electrolysis cells, exhibits excellent CO2 electrolysis performance and long-term stability, and its preparation process is simple.

This invention provides a double-defect type Bi 12 O 17 This paper describes the preparation method and application of Bi2 ultrathin nanosheet photocatalysts, belonging to the field of photocatalytic materials technology. The preparation method is as follows: Bi2 is prepared by reacting a strong base with BiCl3 under ultrasonic assistance. 12 O 17 Cl2 ultrathin nanosheet precursor; then the precursor is mixed with sodium borohydride and a sulfur source and ground to obtain the target catalyst. In Bi 12 O 17 Sulfur doping and oxygen vacancies are simultaneously introduced into Cl2 ultrathin nanosheets to construct a doped-vacancy dual-defect system. By comprehensively utilizing the synergistic enhancement effect of the dual defects, the bottleneck of single-defect modification is overcome, thereby achieving a comprehensive improvement in photocatalytic performance (light capture, charge separation, surface reaction, and stability). This invention features a simple process, low requirements for preparation conditions, and is easily achievable for mass production, demonstrating high practical value and application prospects.

This invention relates to a method for preparing ZnIn2S4 adsorbents, specifically an ultrasonic atomization method based on zinc indium sulfide, belonging to the field of catalytic material preparation technology. The invention aims to address the problems of poor chemical stability and weak surface reaction kinetics in existing sulfide preparation methods. The method involves using zinc chloride, indium trichloride tetrahydrate, and thioacetamide as raw materials, and employing a hydrothermal method combined with ultrasonic atomization at 0 MHz, 1.0 MHz, 2.4 MHz, and 3.0 MHz to prepare ZIS-0, ZIS-1.0, ZIS-2.4, and ZIS-3.0 photoadsorbents, respectively. This method utilizes the acoustic cavitation, hotspot, and aggregation effects of ultrasonic atomization to achieve precise particle size control, increase specific surface area, and shorten the crystallization cycle, significantly improving the adsorption efficiency of atrazine. The preparation process of this invention is mild and simple, and the obtained materials exhibit excellent atrazine adsorption properties in aqueous solutions.

This invention discloses a synergistic modification method for improving the CO2 decomposition performance of ceramic membrane reactors. By preparing a dense membrane substrate containing fluorite and B-site-doped perovskite phases, and constructing an A-site-defect perovskite porous coating on the CO2 feed side, the synergistic regulation of substrate stabilization and surface activation is achieved. The B-site-doped membrane substrate provides a stable transmembrane transport channel for oxygen species generated during CO2 decomposition, while the A-site-defect coating enhances the generation process of oxygen species on the CO2 feed side. Together, they reduce the resistance to surface reactions and oxygen migration on the CO2 side, enabling the membrane reactor to maintain long-term stable operation even at high CO2 decomposition rates. This invention provides an effective substrate-coating synergistic modification method for improving the CO2 decomposition rate and long-term operational stability of membrane reactors.

The present invention relates to a method of repairing pipe and tank surfaces using a poly fill and coated fabrics. The invention relates to a method of repairing pipe and tank surfaces by applying a poly fill and PTFE coated e-glass fabric patches or wraps to both synthetic polymer and / or non-synthetic polymer pipe and tank surfaces. The method utilizes a synthetic polymer preparation solution to prepare the synthetic polymer surface for the molecular integration, a polymerization catalyst as well as a heating source for activating and accelerating the molecular integration process, and a surface-insensitive bonding agent formulated to react with the pipe or tank surfaces for a more consistent, and reliable molecular integration.

The application provides a preparation method of melamine cyanurate coated phosphorus flame retardant and application of the flame retardant in flame-retardant water-based polyurethane artificial leather. In the preparation method, melamine cyanurate is coated on the surface of phosphorus flame retardant powder in an in-situ polymerization manner, and a solvent containing no ethanol is used as a reaction medium in the reaction process, so that the advantages of environmental protection, safety, high yield and high conversion rate are achieved, and the melamine cyanurate coated phosphorus flame retardant has a synergistic effect on the flame-retardant performance.

Provided is a reactor that is capable of suppressing deformation and damage of catalyst grains due to contraction of a reaction tube after thermal expansion thereof. A reactor includes: a reaction tube A aligned in an up-down direction and having, in a bottom section thereof, a catalyst supporter receiving packed catalyst grains and allowing a processed gas to flow therethrough; and a burning unit configured to heat an outer face of the reaction tube A. The reaction tube A has a cylindrical catalyst support face U that is in contact with the catalyst grains in the reaction tube A and that have, in the up-down direction, a plurality of engaging recesses each capable of receiving a portion of the catalyst grain in contact with the catalyst support face in such a manner that the portion of the catalyst grain is fitted into the engaging recess.

Halosilyl-substituted cyclic silicon precursor compounds have a carbon-to-silicon ratio of at least 2: 1, and are defined by Formula I herein. A method of forming a film comprising silicon and oxygen and having a carbon content ranging from 10 at.% to 50 at.% by a thermal ALD process includes placing one or more substrates comprising surface features into a reactor; heating the reactor to one or more temperatures in the range of ambient temperature to about 600 DEG C and optionally maintaining the reactor at a pressure of 100 torr or less; introducing into the reactor at least one silicon precursor according to formula I; purging with inert gas; providing a nitrogen source into the reactor to react with the surface to form a carbon-doped silicon nitride film, purging with an inert gas to remove reaction by-products, repeating the steps to provide a carbon-doped silicon nitride film of a desired thickness, treating the resulting carbon-doped silicon nitride film with an oxygen source at one or more temperatures ranging from about ambient temperature to 1000 DEG C or from about 100 DEG C to 400 DEG C to convert the carbon-doped silicon nitride film to a carbon-doped silicon oxide film; and exposing the carbon-doped silicon oxide film to a plasma comprising hydrogen.

A method and a device for induced formation of solid lubricant comprises providing (S10) of an article (10) to be processed. The article is exposed (S20) to a process fluid (34) comprising a solvent, impact media (20) and additives of solid-lubricant precursor substances. The solvent is a low-volatile high-flash solvent. The impact media are non-abrasive hard particles. The additives of solid-lubricant precursor substances are surface-reactive compounds serving as carriers of at least one of S, P, B and of at least one refractory metal. A velocity difference between surfaces (12) of the article and the impact media is created (S30). This causes impacts between the impact media and the article. Solid lubricant substances are formed (S40) on the surfaces by chemical reactions. The chemical reactions comprise the solid-lubricant precursor substances and are induced by the energy of the impacts. The chemical reactions take place at the surfaces of the article.

The invention relates to the technical field of semiconductor production, in particular to a high-growth-rate EPI production method which comprises the following steps: S1, removing oxide on the surface of a silicon substrate by adopting in-situ hydrogen annealing and repairing lattice defects; a gradient temperature rising strategy is adopted in the preheating stage, and slip lines caused by thermal stress are reduced; s2, in a chemical vapor deposition reaction cavity, adopting a double-gas-path injection system, wherein in a main gas path, mixed gas of high-flow SiH2Cl2 and H2 is used as a main silicon source; in the auxiliary gas path, trace SiH4 and HCl are used for inhibiting gas phase nucleation and adjusting the surface reaction activity; s3, adopting a double-area temperature control reaction cavity, wherein a central area is a high-temperature area, and rapid deposition of silicon atoms is promoted; the marginal area is a low-temperature area and inhibits marginal lattice distortion; the pressure of the reaction cavity is controlled to be 50-100 Torr; s4, in-situ doping and real-time monitoring: synchronously introducing phosphorane or diborane in the growth process, monitoring the doping concentration fluctuation in real time through a light emission spectrum, and feeding back and adjusting the gas proportion.

The application discloses lignin-semi-coke composite porous carbon material and a preparation method and application thereof, wherein the porous material comprises a lignin-semi-coke composite carbon skeleton and an alkaline component; the lignin-semi-coke composite carbon skeleton is prepared by co-pyrolysis of coal and lignin; the alkaline component is loaded on the lignin-semi-coke composite carbon skeleton, and the loading amount of the alkaline component is 1-8% by mass; and the alkaline component comprises one or more of K2O, Na2O and CaO. The technical effect is that the material has a developed mesoporous structure, good diffusion performance for macromolecular substances, high thermal conductivity, fast heat conduction, inhibition of local hot spots, rich oxygen-containing functional groups on the surface, anchoring of active components, complex adsorption of heavy metals, improvement of hydrophilicity, surface reactivity, structure enhancement and other multiple effects; and the material can be used as a catalyst carrier, an adsorbent and an electrode material matrix, and has a good industrialization prospect.

The invention relates to a membrane electrode mode in-situ infrared spectrum detection device applied to electro-catalytic reaction and application and method thereof, and an in-situ infrared pool comprises a counter electrode unit, a membrane electrode unit, a membrane electrode module, a membrane electrode module, a membrane electrode module and a membrane electrode module which are sequentially stacked from top to bottom, and the counter electrode unit comprises an electrolytic bath for containing electrolyte and a counter electrode placed in the electrolytic bath; a first spacer; an ion exchange membrane; a second spacer; a gas diffusion electrode loaded with a catalyst; the silicon prism is plated with a metal film and is engraved with a gas flow channel; the gas diffusion electrode transmits water through the hydrophilic surface and constructs a three-phase reaction interface through the hydrophobic surface; the ion exchange membrane is adhered to the first spacing piece, and the type can be changed; during reaction, gas enters through the flow channel and then reacts with water transmitted through the membrane on the carbon paper. The electrochemical workstation is used for providing stable voltage or current, monitoring the reaction process and collecting infrared spectrum signals of species during reaction on the surface of the hydrophobic carbon paper facing the silicon prism.

This invention discloses a high-performance composite solid electrolyte and its preparation method, belonging to the technical field of electrochemical energy storage and solid electrolyte materials. The solid electrolyte comprises a porous inorganic solid electrolyte framework layer with interconnected channels, a pore wall interface anchoring layer, and a cross-linked polymer network within the channels. The interface anchoring layer is formed by reacting a sulfur-containing silane coupling precursor on the pore wall surface and copolymerizing it with the cross-linked network to achieve pore wall fixation and covalent bridging. The cross-linked network contains polyether segments and fixed anionic structural units introduced by the polymerization of 4-styrenesulfonyltrifluoromethylsulfonylimide lithium monomer. The electrolyte membrane is prepared through framework preparation, pore wall layering, depressurized wetting, and curing, which can reduce solid-solid interface impedance and its growth, increase the lithium-ion migration ratio, reduce the risk of dendrite penetration, and improve cycle stability and safety.

This invention relates to the field of catalyst technology, specifically to a twinned palladium catalyst, its preparation method and application, and a method for hydrogenating carboxybenzaldehyde. The twinned palladium catalyst contains palladium and carbon and has a spherical morphology. The spherical shape of the twinned palladium catalyst not only provides abundant surface reaction sites for the hydrogenation reaction, but the synergistic electronic effect caused by the twinned interface also significantly improves the catalyst's activity and stability. When used for the hydrogenation of carboxybenzaldehyde (e.g., p-carboxybenzaldehyde), it has the advantages of high substrate conversion and high catalyst stability.

Integrated devices including substrates with sample wells having modified surfaces are provided. An integrated device includes a substrate with a sample well having a metal oxide surface and a silica surface, a coating layer on the metal oxide surface formed by an amphipathic reagent attached to a polymeric compound, an antifouling overlay on the coating layer formed by a block copolymer, and a functionalizing agent bound to the silica surface.

This invention discloses a low-temperature high-performance cathode material, its preparation method, and its application, relating to the field of lithium-ion battery cathode material technology. The cathode material is a layered LiNi alloy. 0.6 Co 0.2 Mn 0.2 Using O2 as a matrix, a composite interface layer is constructed in situ on the particle surface. This composite interface layer comprises an outer continuous coating layer and an inner near-surface control layer. Surface reactions and heat treatment using a Li2O, B2O3, and Li3PO4 precursor system are employed to suppress interfacial side reactions, stabilize the near-surface structure, and achieve low-temperature Li... + Improved transport capacity. At -20°C, the preferred sample achieved a discharge specific capacity of 154.21 mAh g⁻¹ in the 10th cycle. ‑1 The rate performance, cycle stability and polarization index are all superior to the original sample and the key control group.

The invention discloses a preparation method of a catalyst for preparing acetaldehyde from ethanol, and belongs to the technical field of chemical synthesis, and the method comprises the following steps: dissolving a metal salt in deionized water, adding a silicon source and a template agent, adjusting the pH value, atomizing the solution, and carrying out aerosol spray drying to form a catalyst precursor; immersing the precursor into a dopamine-Tris buffer solution, and performing in-situ polymerization to form a polydopamine shell layer; and performing high-temperature carbonization and hydrogen reduction to obtain the catalyst. The method comprises the following steps: adding a catalyst into a reaction tube, fixing in a fixed bed reactor, preheating ethanol, introducing into the fixed bed reactor, reacting on the surface of the catalyst to generate acetaldehyde and hydrogen, condensing and separating acetaldehyde, and collecting hydrogen through a gas device arranged at the outlet of the reactor. According to the invention, the problems of low acetaldehyde selectivity, easy sintering deactivation of the catalyst and the like in the prior art are solved, the acetaldehyde selectivity is effectively improved, and the service life of the catalyst is prolonged.

The invention belongs to the technical field of catalysis, and particularly discloses an antimony catalyst and application thereof in flue gas denitration, the antimony-containing catalyst is firstly subjected to plasma activation, active functional group introduction and surface reaction activity improvement, then the antimony-containing catalyst is sequentially etched with an acid solution and an alkali solution, the pore structure of the catalyst can be effectively regulated and controlled, and the surface reactivity of the antimony-containing catalyst is improved. The preparation method comprises the following steps: firstly, preparing a modified component, further improving the reaction activity, then treating with citric acid, polyaspartic acid and a modification liquid to ensure that the modified component uniformly permeates into pores and improve the load stability, and then coating to form a physical coating barrier, thereby effectively improving the flue gas denitration effect.

This invention belongs to the field of manganese ore flotation, specifically disclosing a novel flotation method for rhodochrosite. The method involves pre-oxidizing the surface of rhodochrosite with an oxidant, followed by flotation using a flotation reagent containing sulfur-nitrogen-hydroxyoxime acid collectors to obtain rhodochrosite concentrate. This invention enhances the surface reactivity of rhodochrosite by oxidizing it, thereby strengthening the interaction between rhodochrosite and sulfur-nitrogen-hydroxyoxime acid collectors, achieving highly efficient flotation separation and enrichment of rhodochrosite. Compared with existing rhodochrosite flotation processes, the oxidation flotation method uses lower collector dosages, exhibits better selectivity, and has promising prospects for industrial application.

The invention relates to the technical field of preparation of catalysts, in particular to a solar-driven CO2 conversion molten medium catalyst, a preparation method and application of the solar-driven CO2 conversion molten medium catalyst in a CO2 trapping and separating system, and the solar-driven CO2 conversion molten medium catalyst comprises the following preparation steps: S1, preparing a modified carrier; s2, molten metal is heated to be completely molten, modified molten salt is added, stirring is conducted, and emulsion is obtained; and S3, adding the modified carrier and copper acetylacetonate into the emulsion, carrying out ultrasonic-assisted dispersion in a molten state, cooling, soaking in an ionic liquid, and drying to obtain the catalyst. The synergistic effect of light and heat is realized in a melting system through the synergistic effect of the modified carrier and the modified molten salt, so that electron excitation initiated by light energy and surface reaction kinetics promoted by heat energy supplement each other, the overall conversion efficiency of CO2 is greatly improved, the dual functions of efficient trapping and in-situ catalytic conversion are achieved, and the catalyst has a good application prospect. Complex procedures of separation, compression and storage after CO2 capture in a traditional process are omitted, and the process flow is remarkably simplified.

This invention provides a nitrification method that allows for highly accurate estimation of the concentration of nitrogen atoms in a metal material, such as iron or an iron-based alloy, and the setting of nitrification conditions, without the need to conduct an actual nitrification test. [Solution] When nitriding a metal material made of iron or an iron-based alloy in an atmosphere containing NH3, the concentration distribution of N atoms in the depth direction of the metal material is estimated by considering surface reactions including the nitriding reaction due to the decomposition of NH3, the denitrification reaction accompanied by the removal of NH3, and the denitrification reaction accompanied by the removal of N2, as well as the diffusion of N atoms inside the metal material and the movement of the phase interface between the α phase and the γ phase inside the metal material. The nitriding conditions, including the partial pressure of NH3 in the atmosphere, temperature, and nitriding time, are then set to obtain the desired concentration distribution of N atoms.

The application provides a two-dimensional Cu x Fe y Te crystal thin film and a preparation method thereof, and the method comprises the following steps: S1, selecting Cu, Fe and Te precursors, and pretreating a substrate; S2, mixing Cu and Fe, placing the mixed Cu and Fe in a first carrier, placing the Te precursor in a second carrier, and respectively arranging the first carrier, the second carrier and the substrate in corresponding areas of a CVD reaction device; S3, performing airtightness detection and carrier gas treatment on the CVD reaction device, and heating under the carrier gas condition to make the precursors sublimate and transport; S4, performing heat preservation growth under a preset temperature and the carrier gas condition to make the sublimated precursors react and deposit on the surface of the substrate; and S5, after the growth is completed, cooling the CVD reaction device to room temperature under an inert atmosphere, and obtaining a two-dimensional Cu x Fe y Te crystal thin film. Through regulation and control of the use amount ratio of the Cu, Fe and Te precursors and process parameters, the application realizes the synergistic transport and controllable deposition of the multi-element precursors, and prepares the two-dimensional Cu x Fe y Te crystal thin film with adjustable Cu / Fe element ratio and good crystallization quality.