30 results about "Hydrogen peroxide synthesis" patented technology

The invention discloses a method for catalyzing benzene and hydrogen peroxide to synthesize phenol by using Cu-loading Schiff base. The method comprises steps that: (1) benzene, acetonitrile, 30% of H2O2, a Cu-loading Schiff base complex and an organic phosphine compound promoter are added into a three-necked boiling flask according to a certain mass ratio; a reflux condensing tube and a stirringapparatus are installed; (2) the stirring apparatus is started, the mixture is heated to a temperature of 60 to 75 DEG C, and is subject to a reaction for 4 to 7 hours; (3) when the reaction is finished, stirring is stopped; the mixture is cooled to room temperature; the catalyst is filtered; the filtrate is analyzed by using gas chromatography; and phenol content in the filtrate is calculated through an external standard method; (4) acetonitrile and residual benzene in the filtrate are removed through a distillation method, such that pure phenol is obtained. According to the method, phenol is synthesized through a one-step hydroxylation method by using liquid phase benzene and H2O2. The method has characteristics of high reaction activity, high phenol yield, good selectivity, simple technology, and easy operation. With the method, the yield of phenol can be improved by above 30%.

A highly-dispersed catalyst for hydrogen peroxide synthesis and a preparation method thereof belong to the field of petrochemical engineering. The catalyst mainly comprises catalyst active ingredients and a catalyst carrier. All the catalyst active ingredients are supported on the carrier to form a granular catalyst. The main catalyst active ingredient is a platinum-family precious metal active ingredient which accounts for 0.01-2wt% of the total weight of the catalyst weighed on the basis of the simple substance of precious metal. The catalyst carrier accounts for 98-99.00 wt% of the total weight of the catalyst. The preparation method comprises the following steps: carrying out heat treatment on the platinum-family precious metal active ingredient under the action of a reducing agent and a protective agent to prepare nano-particle sol, supporting the nano-particle sol onto the granular catalyst carrier, and drying to prepare the catalyst. In comparison with a traditional catalyst prepared by an immersion method, the highly-dispersed granular catalyst has advantages as follows: problems of large crystalline grain of the active ingredients and low dispersity are overcome, and catalyst activity is raised. In addition, use of toxic reagents such as organic tin and the like is avoided during the preparation process. The preparation method is green and environmentally friendly and is suitable for production.

The invention relates to a metal modified FSM-16 zeolite catalyst and an application thereof in the reaction of phenol and hydrogen peroxide synthesizing hydroquinone. The metal employed is one or more than one of ferrum, copper, manganese, chromium, tungsten, molybdenum, cobalt, vanadium and titanium. A preparation method of the invention is: layer sodium silicate is added into water solution containing metal salt, in which acid is then added to interpose pH value, the mixing solution is stirred for a period of time before being filtered. Filter mass is transferred into water solution containing template agent. After being stirred for a period of time, the acid is added into the water solution to interpose pH value before being stirred for a period of time, and then the catalyst is obtained through filtering, drying and calcined the water solution. The preparation method of the catalyst is simple and has low cost. In the reaction of synthesizing the hydroquinone through catalyzing the phenol and the hydrogen peroxide, 27.8 percent of conversion rate of the phenol and 96.4 percent of total selectivity of diphenol can be obtained from catalyst Fe-FSM-16, thereby the results of the invention can be compared with TS-1 zeolite.

The invention relates to the technical field of photocatalysis, and particularly discloses a photocatalytic material and a preparation method and application thereof, and the main components of the photocatalytic material are KPF6 and BiOBr. The photocatalytic material provided by the embodiment of the invention has excellent performance of preparing H2O2 by photocatalysis, is a BiOBr composite material improved by KPF6, can be used for efficiently preparing H2O2 by photolysis of water, is prepared by dropwise adding a potassium hexafluorophosphate solution into a bismuth oxybromide precursor solution by adopting a one-step hydrothermal method for hydrothermal reaction, is simple to operate. The problem that an existing BiOBr photocatalyst is not high in hydrogen peroxide synthesis efficiency in the process of preparing hydrogen peroxide through water photolysis is solved. Moreover, the preparation method provided by the invention is simple, and the prepared photocatalytic material is stable in performance and low in cost and has a good market application prospect.

The invention discloses a preparation method and application of a modified glassy carbon electrode as a hydrogen peroxide sensor. The steps of the method are as follows: first, the glassy carbon electrode is ultrasonically cleaned with double distilled water, absolute ethanol and double distilled water in sequence, Obtain a clean glassy carbon electrode; then, ultrasonically disperse 1mg of carbon nanofibers loaded with silver nanoparticles and 2mL of 50% nitrogen-nitrogen dimethylformamide aqueous solution into a uniform glassy carbon electrode modifier; take 8 μL of the above A modifier is added dropwise on the surface of the cleaned glassy carbon electrode, and dried under an infrared lamp to obtain a modified glassy carbon electrode. The preparation method of the modified glassy carbon electrode is simple and easy to operate, and can be directly used for rapid electrochemical determination of hydrogen peroxide, has high current response and good stability, and can improve the detection efficiency and accuracy of hydrogen peroxide.

The invention provides a method for synthesizing hydrogen peroxide through a microbiological electrochemical system. The method is characterized in that microorganism is treated as a catalyst for degrading organic substances; the chemical energy released by the degrading of the organic substance is utilized to drive a cathode of the system to make a reaction of 8H<+>+4O2+8e<-> arrow 4H2O2 under little additional voltage, therefore, hydrogen peroxide in a cathode chamber is synthesized. The system mainly comprises an anode chamber baffle plate, an anode chamber, a cation exchange membrane, a cathode chamber and a cathode chamber baffle plate. With the adoption of the method, the problems of high energy consumption and the emission of intermediate harmful products of a traditional hydrogen peroxide synthesizing method can be solved; a novel hydrogen peroxide synthesizing system and method is provided.

The invention relates to a graphite-polytetrafluoroethylene three-dimensional particle cathode of an MFC (microbial fuel cell) synthesized on basis of hydrogen peroxide and a preparation method. The preparation method comprises the steps of soaking and ultrasonically washing graphite powder, drying the washed graphite powder in a drying box, and then dispersing the dried graphite powder in ethanol; gradually dropwise adding 60(wt)% polytetrafluoroethylene into a graphite ethanol dispersion system under the water-bath heating condition at the temperature of 60 to 80 DEG C, and stirring until the graphite powder forms resilient dough-shaped substances; preparing graphite-polytetrafluoroethylene particles with granularity being 2 to 3mm through an extrusion-rolling method; filling a two-chamber MFC with the dried graphite-polytetrafluoroethylene particles which are used as a three-dimensional electrode, and inserting a graphite rod into a cathode chamber to collect electrons; utilizing a carbon felt as an anode; and establishing a H2O2 three-dimensional air cathode microbial fuel cell. The three-dimensional particle air cathode is large in electrode area and high in mass transfer efficiency. By adopting the graphite-polytetrafluoroethylene three-dimensional particle cathode, the generation of H2O2 is facilitated, and the yield of H2O2 is remarkably increased.

The invention discloses a preparation method of megastigmatrienone. The method comprises the following steps of: dissolving alpha-ionol acetic ester into an organic solvent, adding cuprous chloride serving as a catalyst and an acid to form a mixed solution, and dropwise adding tert-butyl hydroperoxide serving as an oxidant into the mixed solution for synthesizing 3-oxo-ionol acetic ester; dissolving 3-oxo-ionol acetic ester into an organic solvent, and adding a NaOAc serving as a catalyst to synthesize crude megastigmatrienone; and distilling the crude megastigmatrienone under reduced pressure to obtain megastigmatrienone. In the method, readily-available raw materials are adopted, and a peroxides is taken as an oxidant at an oxidation reaction stage, so that environmental pollution caused by a heavy metal oxidant is avoided. Cuprous chloride is taken as a catalyst, a small amount of acid is dripped, and an oxidation reaction is performed under an acidic condition, so that reaction time is shortened greatly. Basic sodium acetate is taken as a catalyst for performing alkaline hydrolysis on an oxidation product, so that the content of megastigmatrienone and the total yield of the reaction are increased finally.

The invention relates to a hydrogen peroxide synthesizing device and method, belonging to the technical field of hydrogen peroxide. According to the device and the method, the following problems in the prior art are solved: (1) by mixing hydrogen and oxygen raw materials, the explosion range is relatively wide, and the danger coefficient is high; (2) hydrogen and oxygen are relatively small in solubility in a reaction medium, and then the reaction efficiency cannot meet the industrial production requirement; and (3) side reactions for directly generating water through hydrogen and oxygen in the reaction process and decomposing hydrogen peroxide occur, and the product selectivity is low. A microchannel reactor comprises a feeding region, a mixing region and a reaction region, wherein the reaction region is coated with a sandwich-structure metal nanoparticle-metal organic skeleton hybrid membrane. The hydrogen peroxide synthesizing method comprises the steps of introducing H2, CO2 and areaction solvent, mixing H2, CO2 and the reaction solvent, and producing H2O2. According to the device and the method, the safe, high-quality and high-efficiency production of hydrogen peroxide is realized.

The invention relates to a metal modified FSM-16 zeolite catalyst and an application thereof in the reaction of phenol and hydrogen peroxide synthesizing hydroquinone. The metal employed is one or more than one of ferrum, copper, manganese, chromium, tungsten, molybdenum, cobalt, vanadium and titanium. A preparation method of the invention is: layer sodium silicate is added into water solution containing metal salt, in which acid is then added to interpose pH value, the mixing solution is stirred for a period of time before being filtered. Filter mass is transferred into water solution containing template agent. After being stirred for a period of time, the acid is added into the water solution to interpose pH value before being stirred for a period of time, and then the catalyst is obtained through filtering, drying and calcined the water solution. The preparation method of the catalyst is simple and has low cost. In the reaction of synthesizing the hydroquinone through catalyzing the phenol and the hydrogen peroxide, 27.8 percent of conversion rate of the phenol and 96.4 percent of total selectivity of diphenol can be obtained from catalyst Fe-FSM-16, thereby the results of the invention can be compared with TS-1 zeolite.

The invention discloses a miniature hydrogen peroxide synthesis apparatus through corona discharge and water mist. The synthesis apparatus comprises a liquid-phase conveying unit, a gas-liquid mixed water mist generation unit, a corona discharge unit, and a H2O2 collection unit. The corona discharge unit comprises several module groups, the module group comprises a negative electrode layer and a positive electrode layer, the negative electrode layer and the positive electrode layer are stacked in a crossed mode, and the negative electrode layer and the positive electrode layer are mutually parallel. The negative electrode layer can be uniformly filled with a negative electrode, the positive electrode layer can be uniformly filled with a positive electrode, and the negative electrode numberon the negative electrode layer is one more than the positive electrode number on the positive electrode layer. The negative electrode is subjected to ground connection, and the positive electrode isconnected with high-voltage supply. The invention also discloses a design method of the miniature hydrogen peroxide synthesis apparatus, a line-line array reactor is employed, and the production is simple.

The invention discloses a supported nano palladium cubic catalyst. The morphology of the palladium metal is cubic, and the index of lattice planes of an exposed crystal face is (100). Compared with palladium metal particles, the supported palladium cubic catalyst has high catalytic efficiency and good selectivity for a preparation reaction of hydrogen peroxide.

The invention discloses a miniature exhaust-free hydrogen peroxide synthesizing device and method and belongs to the technical field of chemical reaction. The device comprises a hydrogenation microdisperser, a micro-packed bed, an oxidation microreactor, a micro-extractor and a phase separation tank connected in an order. The microreactor realizes the catalytic hydrogenation of anthraquinone-containing derivatives and oxidation of the hydrogenated anthraquinone-containing derivative work liquid. Through extraction separation, hydrogen peroxide is obtained. In synthesis, hydrogen and oxygen conversion rates are 100% so that tail gas emission is avoided. The device is free of a gas-liquid separator. The synthesis method is effectively simplified. The production economy and safety are effectively improved.

The invention discloses a hydrogen peroxide synthesis apparatus through photoelectric detection rod array automatic energy adapted with water mist, which is characterized in that hydrogen peroxide issynthesized based on a single-stage cycle medium for blocking the discharge water mist. The hydrogen peroxide synthesis apparatus comprises a gas-liquid inlet control unit, an O2 cycle unit, a hydrogen peroxide generation unit, a data acquisition and control unit, an O2-O3 separating unit, a high-voltage excitation unit, a gas-liquid separation unit, a H2O2 separating unit, an O3 reservoir, a H2O2reservoir, and a solution memory; the rod array high-voltage pulse medium is employed for blocking discharge, through regulation and control of electric, optimum discharge environment is adjusted, production of a rod array reactor is simple, self capacitance is reduced, energy consumption loss is reduced, and a large-area discharge area is suitable for bulk flow production. The apparatus takes asodium chloride solution and oxygen as raw materials for preparing hydrogen peroxide, acquisition is easy, yield is high, and the apparatus is suitable for large-scale preparation of hydrogen peroxide.

The invention discloses a chlorine-doped catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method of the chlorine-doped catalyst comprises the following steps: carrying out primary roasting on an anodized aluminum base material, then carrying out a hot hydration reaction, and then carrying out secondary roasting to obtain a metal-based carrier; the metal-based carrier is subjected to chlorine doping modification, iron compound loading, noble metal loading and reduction to obtain the chlorine-doped catalyst. The prepared catalyst is stable in property, the contained precious metal Pd can generate hydrogen peroxide on line, Fe can further convert the hydrogen peroxide into hydroxyl free radicals with strong oxidizing property, and the doped chlorine element can inhibit side reactions of the hydrogen peroxide in the synthesis process and hydrogenation / decomposition side reactions generated after hydrogen peroxide synthesis. Therefore, the generation amount of hydrogen peroxide is further increased, and the purposes of improving the effect of the electro-Fenton reaction and the degradation rate of pollutants are achieved.

The invention discloses a preparation method of a carbon / anthraquinone composite material, wherein the preparation method comprises the steps: (1) modifying a carbon material, and regulating oxygen-enriched active side sites, defect sites and the like of the carbon material to obtain a modified carbon material with rich O2 reduction active sites; and (2) dissolving anthraquinone in an organic solvent, adding the modified carbon material obtained in the step (1), carrying out an immobilization reaction, and filtering and drying to obtain the modified carbon / anthraquinone composite material. The invention also comprises an application of the prepared carbon / anthraquinone composite material as an electrode in electrocatalytic synthesis of hydrogen peroxide. Air and water are used as raw materials, O2 is subjected to electrocatalytic reduction under mild conditions to generate H2O2, small-scale and efficient production of hydrogen peroxide is achieved, a large-scale centralized mode of traditional production is eliminated, H2O2 is prepared and used at present, and the preparation method is more environmentally friendly and convenient and can meet the requirement for hydrogen peroxide in daily life.

The invention discloses an SnOx / BiVO4 electrode, a preparation method thereof and an application of the SnOx / BiVO4 electrode to photoelectrocatalytic hydrogen peroxide synthesis. The method comprisesthe following steps of dissolving stannous chloride in a mixed solution of ethylene glycol monomethyl ether and acetylacetone, performing ultrasonic treatment and standing, performing spin-coating onto the surface of a bismuth vanadate photoelectrode, and performing annealing in an argon atmosphere to form a tin oxide passivation layer on the surface so as to prepare the SnOx / BiVO4 electrode. According to the SnOx / BiVO4 electrode disclosed by the invention, the tin oxide film passivation layer is loaded on the surface of the bismuth vanadate, so that the photocorrosion of the bismuth vanadateon the surface can be reduced, the stability of the bismuth vanadate is improved, the separation efficiency of electron holes is improved, and the Faraday efficiency of synthesizing hydrogen peroxidethrough photoelectrocatalysis is as high as 90%.

The invention relates to the synthesis and application of a novel fluorescent probe for rapid detection of hydrogen peroxide, which belongs to the technical field of rapid analysis and detection of hydrogen peroxide. Based on the principle that boric acid esters can be selectively oxidized and hydrolyzed by hydrogen peroxide, 4-bromomethylphenylboronic acid pinacol ester was condensed with the hemicyanine parent skeleton to synthesize the hydrogen peroxide molecular fluorescent probe TC-BOR, which has a large The conjugated and strong push-pull electron system accelerates the response to hydrogen peroxide and emits long-wavelength near-infrared fluorescence (723 nm). The response time to hydrogen peroxide is as low as 7 minutes, the fluorescence intensity is increased by 55 times, the detection limit is 2.27 μM, and it can resist the interference of various ions. The probe has good cell membrane penetration and low background fluorescence, and the applicable pH range is 7.4‑10. The probe has the characteristics of rapidity, high sensitivity, and strong selectivity. It is used in the rapid detection of hydrogen peroxide content in food, with excellent indicators, fully meeting the requirements of rapid detection.

The invention discloses a (oxidized) graphene@noble metal nanoparticle@flaky titanium dioxide sandwich structure catalyst and a preparation method thereof, and application in direct synthesis of hydrogen peroxide from hydrogen and oxygen, and belongs to the technical field of inorganic catalyst preparation and hydrogen peroxide synthesis. According to the invention, the (oxidized) graphene@-noblemetal nanoparticle@flaky titanium dioxide sandwich structure catalyst is successfully designed and prepared under mild reaction conditions by using a dissolution thermal synthesis technology and a noble metal deposition and precipitation principle, and the green chemical hydrogen peroxide is directly prepared from hydrogen and oxygen by using the unique catalytic characteristics of the two-dimensional catalyst, wherein the two-dimensional catalyst has the characteristics of uniform and high-dispersion characteristics of noble metal nanoparticles, good protection effect on active sites and simple and convenient preparation, and particularly the two-dimensional catalyst material has significant improvement on the technology of directly synthesizing hydrogen peroxide from hydrogen and oxygen.

The invention provides a high-dispersion monolithic catalyst for hydrogen peroxide synthesis, and a preparation method and an application thereof. A main active component which is one or a combination containing two of noble metals comprising Pd and Pt is supported on an inert honeycomb carrier having a regular structure and coated with a molecular sieve-oxide composite coating to prepare monolithic catalyst. The coating carrier of the monolithic catalyst has a microporous-mesoporous composite hierarchical pore structure, wherein micropores are beneficial to improve the dispersion and hydrogen atom overflow of the active metal(s) in order to improve the hydrogenation activity of the catalyst and reduce the dosage of the noble metal(s); and mesopores provide diffusion channels for reactants and products, are conducive to mass transfer in the mesopores and effectively avoid the formation of a large amount of byproducts in order to improve the selectivity of the catalyst. In addition, the pH value of the molecular sieve carrier can be easily adjusted, so the performances of the catalyst can be further improved. The catalyst can be used in the production process of hydrogen peroxide through catalytic hydrogenation of anthraquinone, and allows the space-time yield of hydrogen peroxide to reach 2.5-5.5kgH2O2(100%) g<Pd><-1>d<-1> and be higher than data of 1-1.8kgH2O2g<Pd><-1>d<-1> in industrial operation.

The invention discloses a miniature exhaust-free hydrogen peroxide synthesizing device and method and belongs to the technical field of chemical reaction. The device comprises a hydrogenation microdisperser, a micro-packed bed, an oxidation microreactor, a micro-extractor and a phase separation tank connected in an order. The microreactor realizes the catalytic hydrogenation of anthraquinone-containing derivatives and oxidation of the hydrogenated anthraquinone-containing derivative work liquid. Through extraction separation, hydrogen peroxide is obtained. In synthesis, hydrogen and oxygen conversion rates are 100% so that tail gas emission is avoided. The device is free of a gas-liquid separator. The synthesis method is effectively simplified. The production economy and safety are effectively improved.

The invention discloses a preparation method of megastigmatrienone. The method comprises the following steps of: dissolving alpha-ionol acetic ester into an organic solvent, adding cuprous chloride serving as a catalyst and an acid to form a mixed solution, and dropwise adding tert-butyl hydroperoxide serving as an oxidant into the mixed solution for synthesizing 3-oxo-ionol acetic ester; dissolving 3-oxo-ionol acetic ester into an organic solvent, and adding a NaOAc serving as a catalyst to synthesize crude megastigmatrienone; and distilling the crude megastigmatrienone under reduced pressure to obtain megastigmatrienone. In the method, readily-available raw materials are adopted, and a peroxides is taken as an oxidant at an oxidation reaction stage, so that environmental pollution caused by a heavy metal oxidant is avoided. Cuprous chloride is taken as a catalyst, a small amount of acid is dripped, and an oxidation reaction is performed under an acidic condition, so that reaction time is shortened greatly. Basic sodium acetate is taken as a catalyst for performing alkaline hydrolysis on an oxidation product, so that the content of megastigmatrienone and the total yield of the reaction are increased finally.

The present invention relates to a catalyst for synthesis of hydrogen peroxide by means of the anthraquinone process and for recovering a working solution, and to a method of preparing the catalyst. Disclosed is a catalyst in which palladium, magnesium, and cerium components are uniformly distributed in alumina, or a palladium component is distributed in alumina spheres in a ring shape while magnesium and cerium components are uniformly distributed in alumina. In addition, a method of preparing the catalyst is disclosed.

The invention discloses a preparation method of a thermal reduction graphene oxide modified graphite cathode. The method comprises the following steps: carrying out thermal reduction on graphene oxidepowder in an argon atmosphere at 1100 DEG C for 10 minutes, mixing the thermally reduced graphene oxide with graphite, and rolling by a roller press to form a circular electrode sheet with the radiusof 1.5 cm, wherein the specific surface area of the prepared electrode is 28 cm<2>, and the electrochemical active area of the prepared electrode is 17 cm<2>, which is obviously higher than that of areduced graphene oxide modified graphite cathode prepared by a chemical oxidation-reduction method. According to the invention, when the obtained air breathing cathode modified by the thermally reduced graphene oxide is used for an electrochemical system, high rate and current efficiency are achieved in the aspect of hydrogen peroxide synthesis; and the reduction degree of the graphene oxide in the cathode can be regulated and controlled through the thermal reduction temperature, and the higher the thermal reduction temperature is, the higher the reduction degree of the graphene oxide is, sothat the reduction degree of the graphene oxide in the cathode can be simply and conveniently regulated and controlled according to actual requirements.

The invention discloses an electronic grade hydrogen peroxide synthesis and purification method, which comprises the following steps: a synthesis process and a purification process, the synthesis process is an electrolysis process, when the concentration of hydrogen peroxide in the electrolysis process reaches 0.5-2 wt%, an electrolyte containing hydrogen peroxide is subjected to purification process treatment, and the purification process comprises the steps of distillation and ultra-purification. Electronic-grade hydrogen peroxide meeting the SEMI G2 standard can be prepared through the distillation process step, and ultra-pure electronic-grade hydrogen peroxide meeting the SEMI G3, G4 and G5 standard or with higher purity can be produced through the further ultra-purification step. The method has the beneficial effects that relatively low-cost high-purity water and high-purity oxygen are adopted as raw materials, the total organic carbon content in the prepared hydrogen peroxide can be ignored, after inorganic impurities are efficiently removed through a mature distillation process, the electronic-grade hydrogen peroxide with higher purity is prepared by further utilizing an ultra-purification process, and the method is suitable for industrial production. The process flow is simple, the production cost is low, and potential industrial application value is achieved.

The invention relates to a hydrogen peroxide synthesis device and method, which belongs to the technical field of hydrogen peroxide and solves the following problems in the prior art: (1) The mixed explosion range of hydrogen and oxygen raw materials is wide and the risk factor is high; (2) The solubility of hydrogen and oxygen in the reaction medium is small, making it difficult for the reaction efficiency to meet the requirements of industrial production; (3) During the reaction process, side reactions such as direct generation of water from hydrogen and oxygen and decomposition of hydrogen peroxide result in low product selectivity. The microchannel reactor includes a base plate and a cover plate that are interlocked with each other. The base plate and the cover plate are engaged to form a microchannel structure; the microchannel reactor includes a feed zone, a mixing zone and a reaction zone, and the reaction zone is coated with a sandwich Structured metal nanoparticle-metal-organic framework hybrid films. The hydrogen peroxide synthesis method includes the following steps: passing in H 2 ,O 2 and reaction solvent→H 2 ,O 2 Mix with reaction solvent → produce H 2 O 2 . The invention realizes safe, high-quality and high-efficiency production of hydrogen peroxide.

The invention discloses a method for catalyzing benzene and hydrogen peroxide to synthesize phenol by using Cu-loading Schiff base. The method comprises steps that: (1) benzene, acetonitrile, 30% of H2O2, a Cu-loading Schiff base complex and an organic phosphine compound promoter are added into a three-necked boiling flask according to a certain mass ratio; a reflux condensing tube and a stirringapparatus are installed; (2) the stirring apparatus is started, the mixture is heated to a temperature of 60 to 75 DEG C, and is subject to a reaction for 4 to 7 hours; (3) when the reaction is finished, stirring is stopped; the mixture is cooled to room temperature; the catalyst is filtered; the filtrate is analyzed by using gas chromatography; and phenol content in the filtrate is calculated through an external standard method; (4) acetonitrile and residual benzene in the filtrate are removed through a distillation method, such that pure phenol is obtained. According to the method, phenol is synthesized through a one-step hydroxylation method by using liquid phase benzene and H2O2. The method has characteristics of high reaction activity, high phenol yield, good selectivity, simple technology, and easy operation. With the method, the yield of phenol can be improved by above 30%.

The invention discloses a composite titanium oxide supported noble metal catalyst for hydrogen peroxide synthesis, and a preparation method and an application method thereof. The catalyst adopts composite titanium oxide as a carrier, wherein the composite titanium oxide is formed by compounding a compound containing at least one element of phosphorus, sulfur, selenium, carbon and silicon on the surface of titanium oxide; at least one metal of palladium, gold, silver and platinum is loaded on the carrier. According to the invention, titanium oxide is used as a carrier, and a compound containingat least one element of phosphorus, sulfur, selenium, carbon and silicon is compounded on the surface of the titanium oxide, so that the interface behavior of the original titanium oxide is improved,and the yield of H2O2 is increased in the reaction of directly synthesizing hydrogen peroxide from oxyhydrogen.

The invention belongs to the technical field of catalysts, and particularly relates to an MXenes compound catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of: (1) adding MXenes powder and transition metal salt into a solvent, and mixing well to obtain an MXenes solution for adsorbing transition metal, M in the MXenes powder being one of Ti, Nb and Mo, and X being C or N; (2) adding an organic ligand solution into the MXenes solution for adsorbing transition metal, mixing well to obtain a turbid liquid, and separating and precipitating to obtain a precursor; and (3) calcining the precursor, and carrying out acid pickling to obtain the MXenes compound catalyst. By improving the preparation process of the MXenes compound, the adsorption capacity of the catalyst to O2 and *OOH is effectively adjusted, so that the transition metal and MXenes have strong interaction, the electrochemical hydrogen peroxide synthesis performance is excellent, the preparation process is simple, the cost is low, and the preparation method is suitable for industrial large-scale production.