378 results about "Bifunctional catalyst" patented technology

The invention discloses a preparation method of an adsorption and reduction bifunctional catalyst for denitration of tail gas of a diesel vehicle. The preparation method comprises the following steps: uniformly loading a Pd component and a Cu component on the surface of a molecular sieve to prepare a corresponding Pd-based molecular sieve and a corresponding Cu-based molecular sieve; and then coupling the Pd-based molecular sieve and the Cu-based molecular sieve according to a certain proportion by using a solid-phase grinding means to obtain the adsorption and reduction dual-functional Pd-Cu / SSZ-13 catalyst. The adsorption and reduction bifunctional Pd-Cu / SSZ-13 catalyst prepared by the method not only has excellent SCR activity at the temperature of 200 DEG C or above, but also has good PNA capacity at the temperature of 200 DEG C or below, can realize high-efficiency denitration of diesel vehicle tail gas in a full-temperature section, and can be widely applied to a diesel vehicle tail gas after-treatment system.

The invention discloses a method for preparing a single-benzene-ring liquid chemical through solvent-free hydrogenation degradation of polystyrene waste plastics based on a bifunctional catalyst. According to the method, Nb2O5 is taken as a carrier, 1-3wt% of noble metal ruthenium is loaded to prepare a bifunctional catalyst, and high-molecular-weight polystyrene is efficiently degraded into single-benzene-ring liquid chemicals such as benzene, methylbenzene and ethylbenzene through hydrogenation reaction under a solvent-free condition. Precious metal ruthenium hydrogenates a polystyrene long chain to generate a short-chain hydrocarbon intermediate, then a carrier # imgabs0 # acid site drives beta-cracking and hydrogen transfer reaction, and a single-benzene-ring product is directionally generated through the synergistic effect of the short-chain hydrocarbon intermediate and the carrier # imgabs0 # acid site. The method has the advantages of no solvent, reduced equipment cost, high reaction efficiency, simple reaction operation, mild reaction conditions, simple catalyst preparation process, high activity, selectivity and good stability, and is suitable for industrial production, and no other solvents preempt acidic sites. The method not only can realize cyclic utilization of resources, but also can alleviate the current environmental pollution problem.

The present invention belongs to the fields of environmental protection and environmental catalysis, and particularly relates to a bifunctional catalyst for simultaneously removing NO x and toluene at low temperature, and a preparation method and application thereof. The preparation method of the above catalyst is to prepare a metal salt solution containing a copper source and a cerium source by ultrasonic-ion dispersion method using anhydrous ethanol as a solvent. Under ultrasonic action, Cu ions and Ce ions are loaded onto microporous SAPO-34 molecular sieve, and a supported CuCe / SAPO-34 catalyst is obtained by calcination in an air atmosphere; in the catalyst, [Cu]+[Ce] / [SAPO-34] is 15% to 25% by mass percentage; among them, the molar ratio of Cu to Ce is 0.20 to 0.30:1. The obtained catalyst reduces the accumulation of intermediate species products, resulting in high CO2 selectivity of the catalyst and reducing the problem of excessive oxidation of NH3, thereby realizing a common temperature window for NO x reduction and toluene oxidation, and the selectivities of CO2 and N2 are nearly 100% at 225°C to 350°C.

The invention discloses an integrated treatment method and system suitable for multi-component industrial waste gas, and relates to the technical field of industrial waste gas treatment, and the method comprises the steps of S1, waste gas pretreatment, S2, pre-oxidation and sulfur fixation, S3, thermal oxidation, S4, non-quenching temperature self-adaptive adjustment, S5, selective catalytic reduction denitration, S6, emission and monitoring, and S7, intelligent dynamic system control. The gradient temperature field of the heat storage ceramic body is used for providing accurate and stable air inlet temperature for the SCR reaction, an independent quenching device is omitted, and therefore the comprehensive energy consumption and the operation cost of the system are greatly reduced, and by additionally arranging the pre-oxidation layer and adopting the dual-function SCR catalyst, the heat storage effect of the system is greatly improved. The system effectively realizes advanced fixation of organic sulfur and efficient removal of nitrogen oxides, dynamically adjusts the ammonia injection amount and combustion intensity, ensures that the system can still maintain extremely high treatment efficiency and stability under flow fluctuation and complex working conditions, reduces ammonia escape to the greatest extent, and is convenient to use.

This invention provides a method for synthesizing methyl methacrylate, a bifunctional catalyst for oxidative esterification, its preparation method, and its application. The catalyst comprises catalysts having the general formula AuRh. a O n / MN b O x The active component, wherein N is selected from Group IIA elements, M is a carrier element; a = 0 to 1 and not 0; b = 0 to 1 and not 0; x and n are values ​​determined by the total valence of the elements other than oxygen in the general formula; the catalyst of the present invention has the advantages of high conversion rate and high yield, and its use in the synthesis of methyl methacrylate results in high yield and high raw material conversion rate.

The invention belongs to the technical field of electrode materials, and particularly discloses a self-supporting electrolyzed water catalytic electrode material, a preparation method and application thereof, the self-supporting electrolyzed water catalytic electrode material comprises a foamed nickel-molybdenum alloy as a substrate, and the surface of the foamed nickel-molybdenum alloy is covered with a two-dimensional layered nickel-iron metal hydroxide. The nickel-molybdenum alloy self-supporting nickel-iron double-metal hydroxide obtained by the technology is used as a bifunctional catalyst for hydrogen evolution and oxygen evolution reaction in a non-acidic medium. The foamed nickel-molybdenum alloy is used as a raw material of a current collector and a catalytic active site at the same time, a fresh crystal nucleus is formed on the surface of the foamed nickel-molybdenum alloy through one-step ferric ion etching, then the foamed nickel-molybdenum alloy is placed in air, and the catalytic activity of the nickel-molybdenum alloy is improved under the combined action of water and oxygen. The nickel element from the foamed nickel-molybdenum alloy and the adsorbed iron element spontaneously grow on the surface of the nickel-molybdenum alloy to form the layered double-metal hydroxide nanosheet.

The invention relates to the technical field of catalyst preparation and application, in particular to a normal-temperature conversion and absorption bifunctional catalyst and a preparation method thereof. The technical scheme adopted by the invention is as follows: the normal-temperature conversion and absorption bifunctional catalyst comprises the following components in parts by weight: 3-15% of transition metal oxide; the content of the gamma-Al2O3 is 75%-95%; 1-5% of an alkali metal oxide; the transition metal oxide is an oxide of one or more transition metals selected from cobalt, copper, nickel, manganese and iron; the alkali metal oxide is an oxide of one or more alkali metals of potassium, calcium, sodium and magnesium. The method has the advantages that the novel catalyst capable of converting and absorbing organic sulfur at normal temperature can be obtained by optimizing the types of the catalyst carrier, the auxiliaries and the active components and adjusting the composition proportion of the catalyst, and the requirements of simple production process and high desulfurization precision can be met.

The invention provides a coral reef-shaped bifunctional catalyst for preparing green hydrogen through biomass gasification and synchronously decarbonizing and a preparation method of the coral reef-shaped bifunctional catalyst, and belongs to the field of biomass high-value utilization. The activity and the stability of the catalyst are improved by regulating and controlling the mutual matching of the active phase and the carrier through the falling position of the active metal; the coral reef-shaped bifunctional catalyst is directionally constructed, and a confinement environment required by bond breaking and CO2 conversion is provided by utilizing the unique spatial configuration of the carrier. The catalyst utilizes a green hydrogen production active center to directionally break bonds in a thermochemical conversion process, so that the content of green hydrogen in synthesis gas is increased; cO2 in the synthesis gas is absorbed and converted by using a decarburization active center, and the content of CO2 at an outlet of the reactor is reduced. The bifunctional catalyst prepared by the invention has relatively high activity and cycling stability, two reaction processes (bond breaking, decarbonylation and water gas shift reaction) are coupled to realize preparation of high-H2 / CO (3.84) synthesis gas through biomass thermochemical conversion, and the application prospect is wide.

The embodiment of the invention discloses a bifunctional catalyst for direct synthesis and catalytic oxidation of hydrogen peroxide and a preparation method of the bifunctional catalyst. The catalyst with the dual functions is provided with Pd-based alloy nanoparticles and high-dispersion monatomic transition metal sites at the same time. The preparation method comprises the following steps: preparing a zeolite-like molecular sieve carrier taking transition metal as link ions through a rolling hydrothermal method; then loading gold and palladium metals on the zeolite-like molecular sieve carrier by adopting a low-temperature liquid phase reduction method to obtain a bifunctional catalyst; the bifunctional catalyst for direct synthesis of hydrogen peroxide and preparation of methanol through methane oxidation has high methane conversion rate, methanol selectivity and yield.

The invention provides a high-entropy intermetallic compound bifunctional catalyst as well as a preparation method and application thereof, and belongs to the technical field of energy materials. A wet chemical synthesis method and a controllable annealing process are combined to prepare the high-entropy intermetallic compound bifunctional catalyst, the catalyst comprises carbon-loaded platinum-cobalt-copper-tungsten-molybdenum five-element high-entropy alloy nanoparticles, the alloy nanoparticles have a high-entropy effect and an ordered structure at the same time, the particle size is 4-7 nm, and the particle size of the alloy nanoparticles is 4-7 nm. The molar ratio of metal atoms, namely platinum to cobalt to copper to tungsten to molybdenum, is 4: (1.75 to 2.5): (1.75 to 2.5): (0.01 to 0.5): (0.01 to 0.5). The platinum loading capacity in the catalyst is 20-70 wt%, the catalyst is used for oxygen reduction reaction catalysis of a cathode in a hydrogen fuel cell and / or methanol oxidation reaction catalysis of an anode in a direct methanol fuel cell, the half-wave potential in an acid medium exceeds a commercial Pt / C catalyst by 30 mV or above, and the methanol oxidation peak current density is 1.4-2.5 times that of the commercial Pt / C catalyst or a commercial PtRu / C catalyst.

The invention belongs to the technical field of electro-catalysis and energy materials, and particularly relates to a rare earth element doped Fe-Co-Ni-Cr-Mn (oxygen) hydroxide catalyst, a preparation method and application. The preparation method comprises the following steps: preparing a metal salt solution containing iron, cobalt, nickel, chromium and manganese at room temperature by adopting a one-step hydrothermal method, fully and uniformly mixing the metal salt solution, putting the mixture into a high-pressure reaction kettle, adding foamed nickel, dipping, carrying out hydrothermal treatment, washing and drying to obtain the rare earth element doped iron-cobalt-nickel-chromium-manganese (oxygen) hydroxide catalyst loaded on the foamed nickel (NF). The synergistic effect among various metals can accelerate charge transfer, and the introduction of rare earth elements, especially Ce, can regulate and control the electronic structure of the catalyst, so that the active sites are richer, and excellent HER, OER and UOR activities can be obtained.

The invention discloses a preparation method of a bifunctional catalyst, the bifunctional catalyst and application, the preparation method comprises the following steps: (1) soaking an acidic functional component with an organic matter solution to obtain an acidic functional component precursor; (2) carrying out pre-reduction treatment on the dehydrogenation hydrogenation functional component to obtain a pretreated dehydrogenation hydrogenation functional component; and (3) kneading, molding, drying and roasting a mixture containing the acidic functional component precursor, the pretreated dehydrogenation and hydrogenation functional component, an auxiliary agent and a binder to obtain the bifunctional catalyst. The bifunctional catalyst disclosed by the invention has the characteristics of high conversion rate, good selectivity and excellent regeneration performance.

The invention discloses a preparation method of a difunctional Pd catalyst co-modified by a hydrophobic anionic ionic liquid and NOH and application of the difunctional Pd catalyst in direct synthesis of H2O2. According to the catalyst, a porous material is used as a matrix, a NOH layer which provides rich hydroxyl groups and amino groups and has adhesion is used as a first modified layer, anion ionic liquid (IL-Cl) is used as a second modified layer, and chloropalladate radicals PdCl4 < 2-> are chemically grafted on the first modified layer and the second modified layer and are reduced into Pd nano particles in situ, so that the Pd nano particles are obtained. And finally, carrying out ion exchange with anion Cl <-> on the ionic liquid to introduce hydrophobic anions on the catalyst to obtain the difunctional Pd catalyst. The difunctional Pd catalyst provided by the invention has high catalytic activity, high H2O2 selectivity and high yield, and also has good stability.

The invention discloses a Joule thermal preparation method of a carbon-supported high-entropy sulfide catalyst and application of the carbon-supported high-entropy sulfide catalyst in a zinc-air battery. A metal chlorine salt solution is used as a metal precursor, and sulfur is used as a sulfur source. Sulfur, carbon powder and a metal chlorine salt solution are uniformly mixed and loaded on a conductive carrier, and Joule heat treatment is carried out. Instantaneous high temperature acts on a carbon-supported metal precursor, the metal precursor is decomposed, S8 is decomposed into high-activity S2 gas, diffusion of sulfur atoms is accelerated at high temperature, combination of S2 and reduced metal atoms is promoted, sulfide bonds are formed, meanwhile, segregation is inhibited through rapid cooling, and finally the uniform single-phase carbon-supported high-entropy sulfide catalyst is formed. The uniformly distributed carbon-loaded high-entropy sulfide catalyst is prepared by Joule thermal pyrolysis, the preparation method is simple, energy-saving and environment-friendly, and the catalyst can simultaneously catalyze an oxygen reduction reaction and an oxygen evolution reaction, is used as a bifunctional catalyst for a zinc-air battery, has excellent catalytic activity and stability, and is easy to popularize and use.

The invention provides a mesoporous nanosphere acid-base bifunctional catalyst for synthesizing methyl methacrylate and a preparation method of the mesoporous nanosphere acid-base bifunctional catalyst. The acidic metal ions are introduced into the skeleton of the mesoporous MCM-41 carrier as a modifier, the alkaline active site Cs species are loaded, and the good acid-base balance degree is achieved by regulating and controlling the proportion of the CS species and the acidic metal ions. The composition of the catalyst is Csa / Xb-MCM-41, X is selected from one or two of Zr, Ti, Al, La, Ce and Fe, and a is the mass fraction of Cs species calculated on the basis of a carrier and is 0.08-0.30 in terms of Cs2O; and b is the mass fraction of the oxide corresponding to the element X in the MCM-41 carrier, and is 0.04-0.20. When the catalyst provided by the invention is used for synthesizing methyl methacrylate through reaction of methyl propionate and formaldehyde, excellent catalytic activity and carbon deposition resistance are shown.

The invention relates to a RuSe2-MoSe2 / NF heterojunction bifunctional catalyst for fully hydrolyzed seawater as well as a preparation method and application of the RuSe2-MoSe2 / NF heterojunction bifunctional catalyst, and belongs to the technical field of seawater electrolysis electrocatalysis. The preparation method of the bifunctional catalyst comprises the following steps: (1) mixing deionized water and absolute ethyl alcohol, and magnetically stirring to obtain a mixed solvent; then adding sodium borohydride and selenium powder into the mixed solvent, and stirring until the mixture is completely dispersed to obtain a mixed solution; adding sodium molybdate dehydrate and ruthenium trichloride into the mixed solution, introducing high-purity nitrogen, replacing air, and continuing magnetic stirring to obtain a dark brown precursor mixed solution; and (2) completely immersing the pretreated nickel foam NF in the precursor mixed solution, carrying out hydrothermal reaction, cooling to room temperature after the reaction, taking out the nickel foam NF, washing with deionized water for 3-5 times, then washing with absolute ethyl alcohol for 3-5 times, and drying to obtain the nickel foam NF. The bifunctional catalyst provided by the invention can efficiently catalyze a hydrogen evolution reaction and an oxygen evolution reaction in seawater at the same time.

The invention particularly relates to a phosphotungstic acid / amino-functionalized UiO-66 bifunctional catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving zircon salt, terephthalic acid and 2-aminoterephthalic acid in an organic solvent; adding a regulator acetic acid, and activating to prepare amino-functionalized UiO-66; and slowly dropwise adding a phosphotungstic acid acetonitrile solution into the amino-functionalized UiO-66 acetonitrile dispersion liquid, stirring and reacting at room temperature, and separating and drying to obtain the catalyst HPW at amino-functionalized UiO-66. The bifunctional catalyst (phosphotungstic acid / amino-functionalized UiO-66) is coordinated through an acid-base site at a lower temperature (170 DEG C vsgt; according to the present invention, the reaction is performed at the temperature of 200 DEG C, the formation of carbon deposition can be substantially inhibited at the low temperature, and the catalyst has characteristics of high catalytic activity after five cycles, extraordinary hydrothermal stability and chemical stability, can maintain the stability of the catalyst in the reaction environment with the existence of a small amount of water, and has good and broad application prospects.

Disclosed in the present application are a non-noble metal-based bifunctional catalyst, a preparation method therefor, and the use thereof. The non-noble metal-based bifunctional catalyst comprises a support and an active component; the support is a hydrogen-type ZSM-48 molecular sieve; the active component comprises an active element, the active element being selected from among at least one of Fe, Co and Ni, and the dispersion of the active component being 5.5-40%. The catalyst is prepared by preparing an aluminum source, a templating agent, an inorganic base, a metal precursor and water into a mother solution, and then adding the parent ZSM-48 molecular sieve to the mother solution to be subjected to hydrothermal crystallization at a certain temperature. An one-step recrystallization policy is used to simultaneously construct metal sites and acid sites of the bifunctional catalyst. The bifunctional catalyst prepared by the method has advantages of high metal dispersion and good stability, and exhibits excellent catalytic activity and target product yields in chain alkane isomerization reactions.

The invention discloses a foamed nickel loaded cross cluster-shaped multi-metal phosphide. NiCoFeP is obtained by compounding Ni2P, CoP and FeP. The invention further discloses a preparation method of the foamed nickel loaded cross cluster-shaped multi-metal phosphide. The preparation method comprises the following steps: preparing Ni (OH) 2 / NF which is vertically arranged on the surface of foamed nickel NF in situ through a nickel source and has a nano lamellar structure thickness of 30-40nm, then preparing NiCoFe-LDH / NF with a cross-cluster-shaped structure thickness of 160-180nm in situ through a cobalt source and an iron source, and finally, phosphorizing through a phosphorus source to prepare NiCoFeP / NF with a cross-cluster-shaped structure thickness of 30-50nm. When the catalyst is used as a water electrolysis OER / HER bifunctional catalyst, the OER overpotential is 210-220 mV under the condition that the current density is 50 mA cm <-2 >, and the HER overpotential is 140-150 mV under the condition that the current density is 20 mA cm <-2 >. When the catalyst is used as a complete water splitting catalyst, the current density can be 10mA cm <-2 > under the condition that the potential is 1.51 V; under the condition that the current density is 50mA cm <-2 >, the operation time is 96 hours, and the potential is 1.81 V; and compared with the initial potential, the potential is only reduced by 5%, namely, the performance attenuation can be ignored.

The invention provides a bifunctional catalyst for synthesizing saturated acid ester through unsaturated acid / anhydride esterification-hydrogenation coupling reaction and application of the bifunctional catalyst. The catalyst is composed of a solid acid carrier with an esterification function and an active metal with a hydrogenation function or an active metal and metal oxide auxiliary agent, and the solid acid comprises an acidic oxide, a hydrogen-type zeolite molecular sieve or a supported solid acid. The active metal comprises one or two of Ni, Ru, Pd or Pt or bimetallic or multi-metal composed of Ni, Ru, Pd or Pt and at least one of Mn, Fe, Co or Cu, and the auxiliary agent comprises one or more of oxides of Mg, Ca, Sn, Pb, Y, La, Ce, Sm, Nd, B, P, Mo, W or Zn. The catalyst is used for unsaturated acid / anhydride and alcohol one-step esterification-hydrogenation coupling reaction to synthesize saturated acid ester and has excellent catalytic activity.

This invention discloses a core-shell bifunctional catalyst, its preparation method, and its applications. The catalyst's deoxygenation core is an oxide containing one or more of the following non-precious metals: Mn, Cu, Ni, Ce, or precious metals: Pt, Pd, Rh, Ru, Au, Ag. The desulfurization shell is an oxide containing one or more of the following: Al, Mg, Zr, Zn, Fe, Ni, Mo, W, Co. This invention addresses the industry pain points of existing low-temperature methanol washing processes in coal chemical industries, such as lengthy syngas sulfur and oxygen purification processes, easy sulfur poisoning and deactivation of deoxygenation catalysts, and direct CO2 emissions from tail gas causing carbon emissions and resource waste. Through a self-developed core-shell bifunctional catalyst, it simultaneously achieves ultra-deep removal of all forms of sulfides and oxygen from syngas within a single reactor, while simultaneously realizing the high-value reuse of CO2 from tail gas.

A process for producing C2 to C5 hydrocarbons, the process comprising introducing a feed stream comprising hydrogen and a carbon-containing gas selected from the group consisting of carbon monoxide, carbon dioxide, and mixtures thereof into a reaction zone of a reactor, and converting the feed stream into a product stream comprising C2 to C5 hydrocarbons in the presence of a shaped mixed catalyst in the reaction zone. The shaped mixed catalyst comprises a metal oxide catalyst component comprising nickel oxide, gallium oxide, and zirconium oxide; a microporous catalyst component is a molecular sieve having 8-MR (member ring) pore openings; and wherein the mixed catalyst is reduced in a hydrogen-containing atmosphere at a temperature of 450°C to 750°C.

The invention discloses application of a carbon dioxide adsorption catalytic material in capturing carbon dioxide in air and catalytically converting the carbon dioxide into synthesis gas, relates to a preparation method and application of a material for directly capturing and preparing green synthesis gas in situ, and belongs to the field of carbon dioxide adsorption catalytic bifunctional materials. The preparation method of the material comprises the following steps: manufacturing a large number of point defects on silver-loaded graphene aerogel through thermal reduction and plasma treatment, grafting an ionic liquid, synthesizing a novel bifunctional catalyst, and carrying out direct air trapping and catalysis in an adsorption column, so as to obtain the silver-loaded graphene aerogel. The synthesized novel catalyst can be used for capturing at low carbon dioxide concentration, and then catalyzing carbon dioxide into synthesis gas through electro-catalysis, so that a product with a high additional value is obtained.

The application discloses a kind of bifunctional catalyst and its application in microwave-assisted preparation of biodiesel, belong to catalysis technical field.The application introduces cobalt metal in ZIF-8 skeleton, when MOFs derivative is prepared by calcination, the introduction of transition metal can construct magnetic center, adjust the magnetic loss ability of derivative material, so that the prepared catalyst has strong wave-absorbing performance under 2.45GHz industrial microwave field, can effectively absorb microwave energy and convert it into heat energy, thereby improving the energy utilization efficiency of reaction system, and finally improving the catalytic performance of catalyst, further improve the preparation efficiency of microwave-assisted biodiesel, and has good application value and prospect in catalysis technical field.

The present invention relates to the field of catalyst technology, and more specifically to a mesoporous bifunctional catalyst, its preparation method, and application, and a method for preparing dicyclohexylbenzene. The mesoporous bifunctional catalyst has an average pore diameter of 5 nanometers or greater and contains at least 100 μmol / g of strong acid centers. The mesoporous bifunctional catalyst comprises: 10-30% by weight of an acidic silica-alumina composite; 50-65% by weight of an MCM-41 molecular sieve; 5-10% by weight of a solid superacid; and 1-15% by weight of a hydrogenation metal component. The mesoporous bifunctional catalyst has high catalytic activity and is used to prepare dicyclohexylbenzene, achieving high dicyclohexylbenzene yields and low reaction energy consumption.

The application discloses a bifunctional catalyst for preparing p-xylene from carbon dioxide and hydrogen in one step, a preparation method and application, relates to the technical field of catalysts for preparing p-xylene from carbon dioxide and hydrogen, and opens up a new way for selectively hydrogenating carbon dioxide into high-value p-xylene; the application comprises alkali metal modified FeMn oxides and ZSM-5 capsule zeolites, and is used for converting CO2 into p-xylene through one-step hydrogenation; in the alkali metal modified FeMn oxides, Mn is dispersed on the oxide phase of Fe; the ZSM-5 capsule zeolites are subjected to hydrothermal treatment with a TPAOH solution, and the external passivated Bronsted acid sites of the ZSM-5 capsule zeolites can inhibit the structuralization reaction of dimethylbenzene; the bifunctional catalyst can realize the conversion of carbon dioxide into p-xylene in one step, has high carbon dioxide conversion rate, high space-time yield of p-xylene, and long catalyst service life.

The invention relates to the technical field of new energy, in particular to a metal-water battery system capable of storing energy and asynchronously producing hydrogen and oxygen, the metal-water battery system comprises a bifunctional catalyst, an iron deposition / dissolution electrode and an acidic electrolyte, and the metal-water battery system is prepared by the following specific steps: S1, stainless steel such as 304 or 316 is subjected to molten salt electrolysis modification to prepare the bifunctional catalyst, and the bifunctional catalyst has OER and HER catalytic activity; s2, taking the modified stainless steel catalyst as a first anode, taking inert electrodes such as a copper sheet or a titanium sheet as a first cathode, and forming a first electrolysis system with an acidic ferrous sulfate solution; and S3, electrolysis is conducted through the first electrolysis system, oxygen evolution reaction is conducted on the first anode, and metal iron is deposited on the first cathode. According to the metal-water battery system considering energy storage and asynchronous production of hydrogen and oxygen, time-space separation of deposition / dissolution of iron and hydrogen-oxygen precipitation is regulated and controlled through the bifunctional catalyst, and safe energy storage and step-by-step production of hydrogen energy / oxygen are achieved; the method is suitable for renewable energy storage, hydrogen energy preparation and distributed energy supply scenes.

The invention discloses a preparation method of a Pd / O-OMS-2 direct methanol fuel cell bifunctional catalyst with a Pd-O-Mn interface chemical bond and high Mn < 3 + > content. The Pd / O-OMS-2 bifunctional catalyst with high Mn < 3 + > content is prepared by constructing a Pd-O-Mn interface chemical bond on a Pd and OMS-2 oxygen-enriched oxide interface through a wet chemical reduction method on the basis of strong interaction of metal and a carrier. Due to introduction of a Pd-O-Mn interface chemical bond, redistribution of charges is effectively promoted, the electronic state of a noble metal Pd active site is adjusted, and the catalytic ability of the catalyst is improved. The prepared Pd / O-OMS-2 catalyst shows excellent catalytic performance, long-term stability and efficient four-electron path selectivity in oxygen reduction reaction and methanol oxidation reaction, and is suitable for direct methanol fuel cells. The catalyst is simple in preparation process and low in cost, and has a wide commercial prospect.

The invention discloses an epoxy-ring-opening bifunctional catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst materials and biomass chemical engineering, the catalyst takes a mesoporous molecular sieve SBA-15 as a carrier, tungsten and molybdenum active components are combined with an aluminum-doped silicon-based framework through co-assembly and a hydrothermal method, and the mesoporous molecular sieve SBA-15 is prepared into the epoxy-ring-opening bifunctional catalyst. The total loading amount of tungsten and molybdenum is 10wt% of the mass of a silicon source, the molar ratio of W to Mo is (3: 7)-(7: 3), and the molar ratio of silicon to aluminum is (10-30). The preparation method comprises the following steps: self-assembly of a template agent, co-hydrolysis of a silicon-aluminum source and a tungsten-molybdenum source, hydrothermal crystallization, temperature programming calcination and the like. The catalyst is applied to preparation of biomass polyol from methyl vegetable oleate by one-pot epoxy-ring opening, and epoxidation and ring opening reactions are simultaneously realized under mild conditions. The polyol obtained by the invention has the characteristics of low viscosity, low acid value and high hydroxyl value.

The application discloses a bifunctional catalyst and a preparation method and application thereof. The bifunctional catalyst comprises an active component and a carrier, wherein the active component is loaded on the carrier; the active component comprises active component I and auxiliary active component II; the active component I comprises metal cobalt, and the auxiliary active component II comprises metal M, and M is selected from iron or tin; the carrier is a composite of silicon oxide and carbon; and the carrier has acid functional groups. The application designs a hydrogenation dehydration catalyst with a bifunctional active site of a layered structure from the microstructure design of a heterogeneous catalyst, utilizes the synergistic catalysis of hydrogenation active metal and dehydration acid functional groups to greatly improve the yield of a target product DBU, and enables the overall reaction process to be carried out under mild conditions (80 DEG C, 2.0 MPa), achieves the yield of DBU (>=95%) and has a stability of >=500 hours.