20 results about "Hydrogen peroxide synthesis" patented technology

This invention proposes a photocatalytic material based on Bi2O2S, its preparation method, and its application. The Bi2O2S-based photocatalytic material comprises Bi2O2S, oxygen vacancies introduced onto the Bi2O2S, and an S-type heterojunction constructed on the Bi2O2S. The Bi2O2S-based photocatalytic material is O... V -Bi2O2S / Bi4O5I2 composite photocatalytic material; the O V The preparation method of the -Bi2O2S / Bi4O5I2 composite photocatalyst material includes: Step 1) preparing O V -Bi2O2S catalyst; Step 2) Preparation of O V -Bi2O2S / Bi4O5I2 composite photocatalytic material; the O V The Bi2O2S / Bi4O5I2 composite photocatalytic material is suitable for hydrogen peroxide synthesis; this invention is a novel composite photocatalytic material with a novel structure and excellent performance.

The invention relates to the field of photocatalytic materials, in particular to a photocatalytic material for hydrogen peroxide synthesis and a preparation method and application thereof. The preparation method of the photocatalytic material provided by the invention comprises the following steps: (1) grinding and mixing melamine, potassium chloride (KCl) and hexagonal phase boron nitride (h-BN) to obtain a uniform mixture; and (2) heating the uniform mixture to 500-650 DEG C, carrying out heat preservation treatment, cooling, grinding, washing, and drying to obtain the product. According to the preparation method, a molten salt effect of KCl and a dual-modification strategy of constructing a Type II heterojunction with h-BN are adopted, g-C3N4 is effectively modified, the potassium-doped g-C3N4 / h-BN composite photocatalytic material rich in nitrogen defects is prepared, the material has excellent activity of photocatalytic synthesis of H2O2 and good cycle stability, and the preparation method is suitable for industrial production. A new effective way can be provided for green and sustainable synthesis of hydrogen peroxide.

The invention discloses a preparation method of an oxyacid radical modified graphite-based cathode for electro-catalysis hydrogen peroxide synthesis. An oxyacid (sulfuric acid or phosphoric acid) and nitric acid are compounded to form a mixed acid solution, and the graphite-based electrode is subjected to oxyacid radical modification by using the mixed acid solution. The preparation method of the oxygen-containing acid modified graphite-based electrode is simple and low in cost, does not need harsh conditions such as high temperature and the like, and has great industrial and large-scale production potential; the oxygen-containing acid radical modified graphite-based cathode prepared by an acid treatment method is used for reducing oxygen to produce hydrogen peroxide, the yield of the hydrogen peroxide exceeds 21.79 mg.cm <-2 >. H <-1 > and is increased by about 20 times compared with the yield (1.13 mg.cm <-2 >. H <-1 >) of oxygen oxidation by using unmodified original commercial carbon paper, and meanwhile, the highest selectivity of the hydrogen peroxide is up to 97.5%.

The invention relates to preparation of a quinoline covalent organic framework material and photosynthesis of hydrogen peroxide. The invention provides a quinoline covalent organic framework material for photocatalytic synthesis of hydrogen peroxide, and solves the problems of low yield and low visible light utilization rate of photocatalytic synthesis of hydrogen peroxide. The method comprises the following steps: dispersing two reaction monomers into an organic solvent to form a mixed solution, carrying out ultrasonic treatment on the mixed system for a period of time, adding the organic solvent and acid, and continuously stirring; after heating reaction for a period of time, cooling to room temperature, carrying out solid separation, collecting the solid, washing, drying and grinding to finally obtain the quinoline covalent organic framework. The preparation process is simple and effective, the reagent consumption is low, and the yield is high; the photocatalyst provided by the invention can effectively improve the efficiency of photosynthesis of hydrogen peroxide. The material is applied to the field of photocatalytic synthesis of hydrogen peroxide, experiments show that the material has excellent performance of photocatalytic synthesis of hydrogen peroxide, and the hydrogen peroxide synthesis rate can reach 4120 [mu] mol.g <-1 >. H <-1 > under visible light irradiation.

Described is a catalyst obtained by supporting magnesium and cerium on activated alumina, firing same to immobilize the metals, and then impregnating same with palladium and performing reduction thereon, and is applied, when hydrogen peroxide is prepared by means of an anthraquinone process, to operation solution regeneration or hydrogenation, and thus an efficient regeneration conversion rate or synthesis yield is achieved.

The invention relates to the technical field of hydrogen peroxide synthesis, and discloses a hydrogen peroxide electrochemical synthesis device which comprises a movable modular box body, a fluid treatment module, a reaction module, a detection module, a safety module and a temperature control module, the fluid treatment module is arranged in the movable modular box body and comprises an alkali liquor box, a cathode process circulating pump, an anode process circulating pump, an anode alkali supplementing pump, a pure water inlet and a product collecting box; the reaction module is arranged in the middle of the movable modular box body and comprises a plate frame type electrolytic cell, a cathode gas-liquid separator and an anode gas-liquid separator, an outlet of a cathode of the plate frame type electrolytic cell is communicated with an inlet in the top of the cathode gas-liquid separator, and an outlet of an anode of the plate frame type electrolytic cell is communicated with an inlet in the top of the anode gas-liquid separator; the mode that a traditional intermittent electrolytic cell frequently stops to change liquid is abandoned, and continuous production is achieved through the cathode process circulating pump, the anode process circulating pump, the gas-liquid separator and closed-loop control.

The application discloses a carvacol-loaded covalent organic framework composite photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalysis. The catalyst is prepared by introducing carvacol into a covalent organic framework through an impregnation method. Under visible light irradiation, the composite catalyst has a hydrogen peroxide synthesis yield of up to 7681 μmol·g ‑1 ·h ‑1 in pure water, and can directly utilize in-situ generated hydrogen peroxide to achieve efficient inactivation of escherichia coli in water bodies without adding any exogenous iron ions, and can completely kill in 75 min. The carvacol is first compounded with the covalent organic framework as an electron transfer medium in the application, which significantly improves the photogenerated carrier separation efficiency and photocatalytic performance, and has the advantages of high efficiency, greenness and simple process, and provides a novel integrated solution for photocatalytic preparation of hydrogen peroxide and water body disinfection.

This invention discloses a method for the photocatalytic degradation of bisphenol A and the synergistic generation of H2O2 based on O-ZnIn2S4, comprising: adding the O-ZnIn2S4 photocatalytic material to wastewater containing bisphenol A, and performing photocatalytic degradation of bisphenol A and in-situ generation of H2O2 under visible light irradiation. Under light conditions, the O-ZnIn2S4 photocatalytic material of this invention exhibits excellent activity in the organic matter degradation reaction, while its H2O2 generation rate is high. The system of this invention achieves synergistic coupling of organic pollutant removal and in-situ hydrogen peroxide generation, providing a new photocatalytic strategy for green and efficient hydrogen peroxide synthesis and environmental remediation.

The invention relates to a 1, 1, 3, 3-tetramethylbutyl hydroperoxide synthesis system and a 1, 1, 3, 3-tetramethylbutyl hydroperoxide synthesis process, belongs to the technical field of fine chemical engineering and dangerous chemical synthesis, and provides a 1, 1, 3, 3-tetramethylbutyl hydroperoxide synthesis system and a 1, 1, 3, 3-tetramethylbutyl hydroperoxide synthesis process for solving the problem of low reaction rate caused by immiscibility of substrates and reduction of effective collision of molecules in the synthesis process of 1, 1, 3, 3-tetramethylbutyl hydroperoxide. The system comprises a feeding unit, a micro-reaction unit, a product collection and post-treatment unit and a safety control unit which are communicated with one another, reaction heat can be instantaneously removed by virtue of mutual cooperation of the units and the extremely high heat transfer efficiency of a micro-channel reactor, heat accumulation and local overheating are avoided, and the reaction efficiency is improved. And the risk that the reaction is out of control is fundamentally eliminated. And the safety control unit realizes real-time monitoring and automatic emergency treatment of temperature and pressure, and provides double insurance for high-risk reaction.

The invention belongs to the technical field of energy materials, and relates to a preparation method of a material for electrocatalytic synthesis of hydrogen peroxide by efficiently recycling a waste battery silicon-based negative electrode material. Aiming at the problems of low recovery efficiency and large environmental burden of the existing waste battery, the method comprises the following steps: performing surface modification on a recovered silicon-based material through high-temperature oxidation, introducing a cationic surfactant (CTAB) to construct an ordered carbon structure, doping tin (Sn) metal, and calcining to remove impurities, thereby obtaining the high-performance electrocatalyst. The catalyst shows excellent selectivity and activity in a two-electron oxygen reduction reaction (2eORR), the hydrogen peroxide synthesis efficiency is remarkably improved, and the energy consumption is reduced. According to the method, high-value resource utilization of the waste battery silicon material is realized, an environment-friendly, economical and feasible technical path is provided for green preparation of hydrogen peroxide, and the method has an important application prospect.

The invention discloses an acid self-supply electro-Fenton water treatment system based on a proton exchange membrane, and belongs to the technical field of advanced oxidation water treatment. The system is composed of an electrochemical unit and a Fenton degradation unit, synthesis of hydrogen peroxide (H2O2) and self-acidification of the system are completed synchronously, and a generated acidic H2O2 solution can be directly subjected to Fenton reaction with ferrous ions without adding acid to adjust pH, so that organic pollutants are efficiently degraded; protons in the electrochemical unit are continuously supplied by an anode hydrogen oxidation (HOR) reaction, are directionally migrated to a cathode through a proton exchange membrane, and generate an acidic hydrogen peroxide solution in situ with oxygen in air under the action of a high-efficiency catalyst; under the high current density of 500 mA. Cm <-2 >, the degradation rate and the total organic carbon (TOC) removal rate of various simulated organic pollutants in a Fenton unit can exceed 90%. The method integrates endogenous supply of protons, efficient reduction of oxygen in air and self-construction of an acidic reaction environment, overcomes the dependence of a traditional Fenton technology on external acid addition and high-concentration H2O2, has the advantages of flow simplification, low operation cost, environmental friendliness and the like, and is suitable for distributed and modularized water treatment scenes.

The invention relates to a monatomic tellurium catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, dissolving a tellurium source and a natural polymer precursor in hot water, carrying out hydrothermal reaction on the obtained mixture, and cooling and freeze-drying to obtain a head product; then, putting the initial product into a tubular furnace, pyrolyzing in an atmosphere, and naturally cooling to room temperature; and finally, washing with deionized water and ethanol for three times, and drying in a drying oven to obtain the monatomic tellurium catalyst. The monatomic tellurium catalyst has excellent performance and cycle stability frequency in zinc air batteries and synthesized hydrogen peroxide. Compared with the prior art, the raw materials are cheap and easy to obtain, the preparation process is simple, the cost is low, and the problem that a metal free monatomic catalyst is easy to aggregate and unstable can be solved. And the cost of large-scale energy storage can be reduced, the carbon cycle industry chain is perfected, and the application prospect is good.

The application belongs to the technical field of catalysts, and particularly relates to a carbon-loaded MoO x The application relates to preparation of a cluster catalyst and application of the cluster catalyst to electro-synthesis of hydrogen peroxide. The catalyst comprises an oxygen-doped carbon carrier and a MoO x cluster active component; the oxygen-doped carbon carrier is a two-dimensional nanosheet structure, and the MoO x cluster is a sub-nanometer cluster with a size of <2 nm. The application successfully prepares a sub-nanometer molybdenum oxide cluster composite material loaded on an oxygen-doped carbon carrier by combining pre-adsorption and low-temperature pyrolysis. The composite material utilizes the excellent conductivity and stable structure of the functionalized carbon carrier to provide stable anchoring sites for the sub-nanometer molybdenum oxide cluster with high surface energy, and through construction of a strong interface coupling, the catalytic activity, selectivity and long-term stability of the catalyst in the electro-synthesis of hydrogen peroxide are synergistically enhanced, thereby providing a new material design idea for development of a high-efficiency, stable and low-cost non-noble metal hydrogen peroxide synthesis catalyst.

The invention belongs to the technical field of quantitative analysis, and provides a quantitative analysis method of tert-butyl hydroperoxide synthesis reaction feed liquid. The quantitative analysis method comprises the following steps: placing an internal standard substance 2-hexanol in a volumetric flask, and fixing the volume with methanol to obtain an internal standard substance solution; and mixing the tert-butyl hydroperoxide synthesis reaction feed liquid with the internal standard substance solution, carrying out gas chromatography detection, and calculating the contents of tert-butyl hydroperoxide, tert-butyl alcohol and di-tert-butyl hydroperoxide in the tert-butyl hydroperoxide synthesis reaction feed liquid according to the peak area and the relative correction factor standard curve. The 2-hexanol is used as an internal standard substance, the tert-butyl hydroperoxide synthesis reaction feed liquid is subjected to gas chromatography internal standard method quantitative analysis, the content of a main product tert-butyl hydroperoxide, the content of a byproduct di-tert-butyl hydroperoxide and the content of a raw material tert-butyl alcohol in the feed liquid can be obtained under the same detection condition, the method is safe and efficient, the steps are simple and rapid, and the method is suitable for industrial production. The detection result is high in accuracy and good in repeatability.

The invention belongs to the technical field of photocatalysis, and particularly discloses a modified carbon nitride-based composite photocatalyst as well as a preparation method and application thereof. According to the composite photocatalyst, graphite-phase carbon nitride (g-C3N4) is taken as a matrix, and a cyano-functionalized potassium ion-doped electronic structure system is constructed through a synergistic modification strategy of combination of ammonia gas pretreatment and potassium bromide post-treatment. The preparation method is simple in process, mild in condition and low in cost. The composite photocatalyst is driven by visible light, the generation rate of hydrogen peroxide prepared through photocatalysis by taking water and oxygen as raw materials reaches up to 3.824 mmol.g <-1 >. H <-1 >, is 48 times of that of unmodified carbon nitride (g-C3N4), and is 2.1 times of that of only KBr doped carbon nitride (g-C3N4-KBr), and the composite photocatalyst has high selectivity and good cycle stability, and can be used for preparing hydrogen peroxide. The problems that an existing hydrogen peroxide synthesis technology is large in pollution and insufficient in catalyst activity are solved, and the method has wide industrial application prospects in the fields of clean energy synthesis and green chemical engineering.

The application provides a beta-ketoenamine type covalent organic framework material COF-N32 with a triazine structure and a preparation method and application thereof in photosynthesis of hydrogen peroxide. The preparation method comprises the following steps: adding 2,4,6-trihydroxybenzene-1,3,5-trimethyl formaldehyde and 2,4,6-tris(4-aminophenyl)-1,3,5-triazine into a solvent system comprising 1,4-dioxane, mesitylene and a 3 mol / L acetic acid solution, performing ultrasonic oscillation, heating and reacting, and washing and drying to obtain the covalent organic framework material COF-N32. The beta-ketoenamine type covalent organic framework material COF-N32 with a triazine structure is synthesized through a solvothermal reaction, is used as a photocatalyst for synthesis of hydrogen peroxide, does not need to be modified through a heterojunction, protonation and the like subsequently, is simple and convenient to operate, is simple, efficient, safe, stable, and has no risk of release of metal ions in the photocatalytic synthesis of hydrogen peroxide, and the prepared material can be effectively regenerated and reused after use.

The invention relates to an electrocatalyst based on a Joule heat high-temperature flash evaporation plastic material and application of the electrocatalyst in hydrogen peroxide electrosynthesis. The preparation method of the electrocatalyst comprises the following steps: mixing plastic powder, metal chlorate and carbon black, carrying out uniform ball milling, carrying out multiple times of high-voltage Joule heat flash evaporation treatment, and then carrying out pickling purification and drying to obtain the porous carbon-based electrocatalyst containing the metal nanocluster or atom dispersion structure. The catalyst is loaded on hydrophobic carbon paper and can efficiently catalyze a two-electron reduction reaction of oxygen on a gas-liquid-solid three-phase interface, so that stable and high-selectivity hydrogen peroxide electrosynthesis is realized. Compared with a traditional catalytic material, the catalyst has the advantages of being simple and convenient in preparation process, low in raw material cost, high in resource recycling rate, excellent in electro-catalytic performance and the like, is suitable for a green distributed hydrogen peroxide synthesis system and has good environmental and economic benefits.

The application belongs to the technical field of catalyst preparation and hydrogen peroxide synthesis, and relates to a preparation method and application of a bimetallic hydroxyl compound catalyst, in particular to a preparation method of a bimetallic hydroxyl compound catalyst and a rare earth doped bimetallic hydroxyl compound catalyst. The bimetallic hydroxyl compound catalyst is obtained through a coprecipitation reaction by taking stannate, zinc salt and rare earth salt as reactants; the molar ratio of tin in the stannate, zinc in the zinc salt and rare earth in the rare earth salt is 1:(0.8-1):(0-0.2). The ZnSn(OH)6 catalyst or the rare earth doped ZnSn(OH)6 catalyst is prepared through one-step coprecipitation under the condition of not adding or adding the rare earth salt and without adding any additive by taking water-soluble zinc salt and stannate as raw materials, the preparation method is simple, a high-pressure closed container such as a hydrothermal kettle and other morphology control agents are not needed, and the performance of the ZnSn(OH)6 catalyst in piezoelectric catalysis synthesis of hydrogen peroxide is improved through rare earth doping.

The invention discloses a laboratory type hydrogen peroxide synthesis galvanic pile test system which is characterized in that cathode liquid is pressurized by a cathode pump in a cathode circulation module, then enters a reaction module, is subjected to electrochemical reaction and then returns to a product tank through a cathode outlet; the anode liquid enters the reaction module under the driving of the anode circulating module, is subjected to electrochemical reaction in the reaction module, and flows into the anode liquid storage barrel through the anode outlet; the mass transfer module provides humidified and quantitative oxygen; the reaction module converts anode liquid, cathode liquid and oxygen into hydrogen peroxide through electrochemical reaction, and the hydrogen peroxide enters a product tank through a cathode outlet of the reaction module; the electrical module controls fluid parameters and pressure parameters of the cathode circulation module, the anode circulation module and the mass transfer module in a coordinated mode and collects and processes signals of all sensors. According to the invention, fluid parameters of each circulation and mass transfer module are coordinated and controlled through the electrical module, and stable supply of materials in the reaction pile and accurate regulation and control of the reaction process are realized.

This invention relates to the preparation and photocatalytic application of a tetraaldehyde COF composite material modified with an ionic liquid. It involves the formation of a covalent organic framework from a tetraaldehyde monomer under organic solvent reaction conditions, followed by the composite formation of an ionic liquid. The aim is to improve the efficiency of the covalent organic framework material in the photocatalytic synthesis of hydrogen peroxide. Method 1: Preparation of TfbdBpy-COF material. Method 2: Composite formation of TfbdBpy-ILs-COF material. The preparation process of this invention is simple and effective, with low reagent consumption and high yield. Furthermore, this invention can effectively improve the efficiency of photocatalytic hydrogen peroxide synthesis. This invention is applied to the field of photocatalytic hydrogen peroxide synthesis. Experimental data shows that the addition of an ionic liquid significantly improves the performance of photocatalytic hydrogen peroxide synthesis. Under visible light (420 nm) irradiation, the photocatalytic hydrogen peroxide yield of the ionic liquid-COF composite material reaches 1.4 mmol / g. ‑1 .h ‑1 It is 4 times the performance of COF alone.