560 results about "Bifunctional catalyst" patented technology

The invention belongs to the field of air electrode materials of zinc-air batteries, and particularly relates to a self-supporting electrode and a preparation method and application thereof. The invention discloses a self-supporting electrode. The self-supporting electrode comprises a conductive substrate, a nitrogen-doped carbon nanotube and FeNi3 particles distributed in the nanotube, the nitrogen-doped carbon nanotubes grow on the surface of the conductive substrate. According to the self-supporting electrode provided by the invention, nickel has high OER catalytic activity, meanwhile, iron shows high ORR catalytic activity, and an efficient bifunctional catalyst is obtained by adding heteroatom iron into a nickel-based material under a synergistic effect; ferronickel metal is distributed in the nitrogen-doped carbon nanotube, so that metal particle aggregation in a high-temperature synthesis process or decomposition failure under an extreme working condition is effectively prevented; the self-supporting electrode is high in electrochemical activity, good in cycle performance, good in flexibility and portability, stable and excellent in battery performance and excellent in mechanical performance.

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 multi-stage carbon dioxide capture and utilization method and device. CO2-containing high-temperature flue gas enters an adsorption reactor and passes through the adsorption reactor filled with a bifunctional catalyst, and CO2 in the flue gas is adsorbed and captured by a catalytic material in a catalyst bed layer; decarburized gas comes out of the adsorption reactor, exchanges heat with process gas from the conversion reactor in a heat exchanger, and enters the next stage of adsorption reactor after heat exchange, when the adsorption reactor reaches the saturated adsorption capacity of an adsorbent, CO2-containing high-temperature flue gas is switched to enter the first stage of conversion reactor, at the moment, reducing gas enters the adsorption reactor, and the CO2-containing high-temperature flue gas enters the second stage of conversion reactor; and the converted synthesis gas is sent out of the device. By means of the technical process, the energy utilization rate can be fully increased, the emission reduction cost can be effectively reduced, high energy consumption caused by trapping cooling / conversion heating can be avoided, and the problems of high cost for purification and transportation after CO2 capture and potential safety hazards caused by burying are solved.

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 invention provides a PtRu-based composite bifunctional catalyst and a preparation method and application thereof, the PtRu-based composite bifunctional catalyst comprises a carrier and a load loaded on the carrier, and the carrier comprises a graphitized carbon carrier; the load comprises platinum ruthenium-based metal particles and a compound with a chemical formula of HxMO3, wherein M comprises W or / and Mo. According to the PtRu-based composite bifunctional catalyst disclosed by the invention, the metal PtRu plays a role in resisting CO poisoning, and the HxMO3 plays a role of a proton acceptor, so that a hydrogen oxidation reaction is promoted. Meanwhile, the HxMO3 can strengthen a difunctional mechanism of a carbon monoxide oxidation reaction, and the CO poisoning resistance of the catalyst is improved. In addition, the graphitized carbon carrier with a specific graphite microcrystal size has good high-potential corrosion resistance and metal dispersibility, and metal agglomeration and performance degradation of the catalyst caused by high-potential corrosion of the carrier are greatly slowed down.

The invention discloses a method for preparing aromatic hydrocarbon by catalyzing carbon dioxide hydrogenation, which is characterized in that a fixed bed reactor is filled with a bifunctional catalyst, and the bifunctional catalyst is prepared by mechanically mixing an iron-based metal oxide CuFeO2 catalyst and orderly stacked multiple layers of HZSM-5 nanosheets, wherein a structure-directing agent hexadecyl trimethyl ammonium bromide is added to guide synthesis during hydrothermal synthesis of the orderly stacked multi-layer HZSM-5 nanosheets; before reaction, the CuFeO2 catalyst is reduced by hydrogen, and then carbon dioxide, hydrogen and nitrogen are introduced for reaction. According to the invention, the CuFeO2 catalyst is coupled with the multilayer HZSM-5 nanosheet to catalyze CO2 to prepare the aromatic hydrocarbon, the aromatic hydrocarbon with high space time yield can be obtained under the condition of high CO2 conversion rate, and the used catalyst is simple in preparation method, low in price, green and pollution-free, and is suitable for industrial production. The problems of low carbon dioxide conversion rate, high selectivity of by-products (carbon monoxide and methane) and low yield of aromatic hydrocarbon products in the reaction of preparing aromatic hydrocarbon by carbon dioxide hydrogenation of the existing catalyst are solved.

The invention relates to the field of gas adsorption and catalysis, in particular to a bifunctional catalyst and a preparation method and application thereof. The catalyst is of a hollow tubular structure, takes calcium oxide as a basic component, and further comprises a nickel oxide, a cobalt oxide and a nickel-cobalt bimetallic oxide, wherein the molar ratio of the Ca element in the calcium oxide to the nickel oxide to the Ni element in the nickel-cobalt bimetallic oxide to the cobalt oxide to the Co element in the nickel-cobalt bimetallic oxide is (5-25): (2-15): 1; the Ni element comprises two valence states of Ni < 2 + > and Ni < 3 + >; and the Co element comprises three valence states of Co < 2 + >, Co < 3 + > and Co < 4 + >. Due to the specific elements and content of the hollow tubular catalyst, the gasification catalysis capability and adsorption capability of biomass and waste plastics are improved, and carbon deposition of the catalyst is inhibited.

The invention discloses a core-shell catalyst for preparing polyoxymethylene dimethyl ethers through methanol dehydrogenation and preparation and application thereof.The catalyst comprises an acidic molecular sieve, a metal active component and aluminum-containing mesoporous silica, the acidic molecular sieve serves as a core structure, the metal active component is coated on the surface of the acidic molecular sieve to form a first coating layer, and the aluminum-containing mesoporous silica serves as a second coating layer; and the aluminum-containing mesoporous silica is coated on the surface of the metal active component to form a second coating layer. According to the prepared core-shell catalyst, a middle acidic molecular sieve and aluminum-containing mesoporous silica on the outermost layer are used as acidic sites, a metal active component on the middle layer is used as a dehydrogenation site, and the two reaction sites are integrated to construct a bifunctional catalyst; in-situ coupling of two-step reaction of preparing formaldehyde through methanol dehydrogenation reaction and preparing polyoxymethylene dimethyl ether through condensation reaction of methanol and formaldehyde is realized, so that the reaction steps are simplified, and the reaction selectivity is also improved.

The invention provides a preparation method and application of a catalyst for selective production of ethanethiol. The catalyst comprises an active component, an auxiliary agent and a molded alumina carrier, the active component comprises the following components in percentage by mass: 5-10% of VIII group transition metal oxide and 15-20% of VIB group metal oxide, and the auxiliaries comprise 0.5-4% of alkali metal, 1-3% of alkaline earth metal oxide, 0.6-2% of cerium oxide and 1-4% of phosphorus pentoxide. A bifunctional catalyst with moderate Lewis acid-base sites is constructed by compounding a multi-component aid and an active component, and the catalyst shows excellent catalytic activity that the ethylene conversion per pass is greater than or equal to 98%, the ethanethiol selectivity is about-95% and the ethanethiol yield is-90% under the reaction conditions that the hydrogen sulfide / ethylene feeding mass ratio is 3-5, the temperature is 180-210 DEG C, the pressure is 0.5-1.0 MPa and the volume space velocity is 200-300 h <-1 >. And the catalyst can stably run for 1250 hours or more.

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.

A hydrogenation-acid catalysis bifunctional catalyst, based on the mass of the catalyst, contains 80-99.8% of a silica-alumina molecular sieve component, 0.2-2% of a metal component with hydrogenation activity supported on the molecular sieve, and 0-20% of a hydrocarbyl modifying component. The hydrogenation active metal is selected from ruthenium, platinum, palladium, copper, nickel, or a combination thereof. The hydrocarbyl modifying component is a C1-20 hydrocarbyl. The catalyst has dual functions of hydrogenation and acid catalysis, and is suitable for benzene hydroalkylation reaction and alkane hydroisomerization reaction. It can be used in the benzene hydroalkylation to produce cyclohexylbenzene with high benzene conversion rate, high product selectivity, and less by-product cyclohexane.

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 discloses a synthesis method of a bifunctional MeOx / AZE catalyst and application of the bifunctional MeOx / AZE catalyst in catalyzing CO2 hydrogenation to synthesize high-density aviation fuel, MeOx in the catalyst is a composite metal oxide of metal Zr and auxiliary metal M, the content of Zr in the metal is 75.0-95.0 mol%, and the content of the auxiliary metal M is 5.0-25.0 mol%; the auxiliary metal M is one or more of Zn, Ga, Ce, La and In; aZE is an acidic molecular sieve. The synthesized catalyst shows excellent CO2 hydrogenation coupling performance, the polycyclic aromatic hydrocarbon is introduced in the CO2 hydrogenation reaction for functional coupling reaction, the conversion of CO2 is promoted, the coupling reaction with the polycyclic aromatic hydrocarbon is carried out, the alkyl-substituted polycyclic hydrocarbon compound is synthesized, the difficulty that high-density aviation fuel components cannot be synthesized through single CO2 hydrogenation is overcome, and the synthesis efficiency is improved. And the selectivity of the high-density aviation fuel component alkyl polycyclic hydrocarbon product with excellent performance is enhanced.

The invention relates to an LDHs (Layered Double Hydroxides) bifunctional catalyst for preparing CO through CO2 selective absorption in-situ relay coupling low-energy-consumption conversion as well as a preparation method and application of the LDHs bifunctional catalyst. Controlling the thickness of a laminate to prepare an ultrathin NO3-intercalated LDHs carrier, adding a metal salt solution in N2 atmosphere, and reducing metal to obtain the catalyst. The method comprises the following steps of: applying the LDHs to a reaction device, introducing CO2-containing feed gas, realizing the trapping process that CO2 is stored between the LDHs in the form of CO3 < 2-> in the presence of water vapor, and then performing low-temperature in-situ conversion on the CO3 < 2-> in the interlayer into a high-added-value product in an H2 atmosphere. After the reaction, the catalyst continues to selectively capture CO2 and is repeatedly used, and CO2 capture-in-situ conversion integration is achieved. According to the invention, H < + > transfer and interlayer carbonate reduction are promoted; meanwhile, desorption of a CO intermediate on the surface of the catalyst is accelerated, subsequent reaction steps are prevented, and therefore the process of preparing CO from CO2 at low temperature is achieved, energy consumption is low, efficiency is high, and selectivity is high.

The invention belongs to the technical field of preparation of electrolyzed water catalysts, and particularly relates to a preparation method and application of an anion intercalation r-Ru-NiFe-LDH catalyst. The foam iron is subjected to washing pretreatment and freeze drying; the preparation method comprises the following steps: putting foam iron into an alkaline aqueous solution of nickel salt, and carrying out hydrothermal reaction to obtain an anion intercalated NiFe-LDH precursor growing on the foam iron; and putting the anion intercalated NiFe-LDH precursor into a ruthenium chloride solution, carrying out hydrothermal reaction again, taking out, drying, and carrying out reduction treatment to obtain the anion intercalated ruthenium-loaded NiFe-LDH catalyst growing on the foam iron. The invention provides a new idea for research and development of a seawater electrolysis bifunctional catalyst with high activity and stability under high current density, and has a wide industrial application prospect.

The invention relates to the technical field of preparation of propylene carbonate, and discloses a solid bifunctional catalyst as well as a preparation method and application thereof. The solid bifunctional catalyst comprises a titanium silicalite molecular sieve and alkaline earth metal oxide loaded on the titanium silicalite molecular sieve. By adopting the solid bifunctional catalyst, propylene carbonate can be directly and continuously synthesized from propylene, an oxidizing agent and CO2 through one-step reaction. The technical process is obviously simplified, the links of separation, purification, storage and transportation of epoxypropane are cancelled, and the production efficiency is improved through continuous production; the process energy consumption is obviously reduced, and the economical efficiency of the whole process is improved.

The invention provides a PdRh alloy coated cuprous oxide nanorod array bifunctional catalyst as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, foamy copper is subjected to chemical oxidation treatment, then the foamy copper and a mixed solution of PdCl2 and RhCl3 are subjected to co-heating and redox reaction to obtain the cuprous oxide nanorod array bifunctional catalyst wrapped by the PdRh alloy, and the catalyst has a synergistic effect of PdRh alloy doping and Cu0 / Cu < + >; the catalyst can efficiently promote furfural molecular adsorption, C-H bond breakage and hydrogen desorption in furfural oxidation and hydrogen evolution reaction, can be used as an excellent bifunctional catalyst material for low-potential furfural oxidation and hydrogen evolution reaction, has excellent electrocatalytic activity and stability for low-potential furfural oxidation and hydrogen evolution reaction, and can be used as a catalyst for low-potential furfural oxidation and hydrogen evolution reaction. And a low-energy-consumption bipolar hydrogen production system can be constructed by coupling low-potential furfural oxidation and hydrogen evolution reaction. The preparation method disclosed by the invention is simple, convenient, feasible, economical, practical and suitable for large-scale industrial production.

The invention discloses a bifunctional catalyst and a preparation method and application thereof, and relates to the technical field of catalytic materials, the bifunctional catalyst comprises a carrier and monatomic Ag and nano Ag clusters dispersed on the carrier, and the catalyst is obtained by loading the monatomic Ag and the nano Ag clusters on the surface of the carrier. The bifunctional catalyst has the dual functions of synthesizing hydrogen peroxide and efficiently degrading tetracycline in sewage, meanwhile, the concentration of photosynthesis hydroxyl radicals of the bifunctional catalyst is remarkably higher than that of other catalysts, higher reaction activity is achieved, tetracycline in the sewage can be completely degraded within 10 min, and the degradation rate reaches 0.36 min <-1 >.

The invention provides a layered lattice iron bifunctional catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a layered structure material with deionized water to obtain slurry, adding the slurry into a nucleation reactor, violently stirring, and circularly stirring for multiple times; then collecting the slurry, centrifuging, and carrying out vacuum drying on the obtained solid material to obtain a purified material; and calcining the obtained material at high temperature for structural evolution to obtain the layered lattice iron bifunctional catalyst. The layered lattice iron bifunctional catalyst provided by the invention has a unique pore structure, a large specific surface area and wide pore distribution, effectively adsorbs and enriches organic pollutants in water, provides driving force for Fenton oxidative degradation of low-concentration organic pollutants, and improves the Fenton oxidative degradation efficiency; the layered lattice Fe exists in the catalyst in the form of an aluminum-oxygen-iron covalent bond, the Fe stability is improved, the Fe dissolution amount is extremely low in the oxidative degradation process, no iron mud is generated, and continuous removal reaction and recycling of the catalyst are facilitated.

The invention provides a preparation method and application of a cobalt-aluminum hydrotalcite loaded noble metal catalyst rich in metal defects. The preparation method comprises the following steps: dissolving a cobalt source, an aluminum source, urea and ammonium fluoride in an aqueous solution, and carrying out hydrothermal reaction to obtain a cobalt-aluminum hydrotalcite precursor; the preparation method comprises the following steps: preparing a precursor, treating the precursor with an alkaline solution to obtain a defect-rich cobalt-aluminum hydrotalcite carrier, and dipping the defect-rich cobalt-aluminum hydrotalcite carrier in a noble metal solution to obtain the defect-rich cobalt-aluminum hydrotalcite supported noble metal catalyst. The preparation method is simple and high in operability, the noble metal can be anchored on the defect-rich cobalt-aluminum hydrotalcite carrier, and the defect-rich cobalt-aluminum hydrotalcite loaded noble metal catalyst can be used as a bifunctional catalyst through the synergistic effect of the noble metal and the cobalt-aluminum hydrotalcite carrier, has excellent electro-catalytic performance, and can be used for preparing a catalyst for preparing the cobalt-aluminum hydrotalcite loaded noble metal catalyst with the defect-rich cobalt-aluminum hydrotalcite loaded noble metal catalyst with the defect-rich cobalt-aluminum hydrotalcite loaded noble metal catalyst. And the electrolytic tank assembly process is simplified, and the production cost is reduced.

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 method for preparing aviation kerosene from biogas through reforming and Fischer-Tropsch reaction. The method comprises the following steps: firstly, reforming the biogas and water vapor into synthesis gas on a Ni / MgO-Al2O3 catalyst; then preparing aviation kerosene through Fischer-Tropsch synthesis on a Co-molecular sieve bifunctional catalyst; and then C1-C7 low-carbon chain hydrocarbon generated by Fischer-Tropsch synthesis enters a reforming cycle. According to the bifunctional catalyst in the Fischer-Tropsch synthesis process, cobalt acid salt and organic alkaline quaternary ammonium salt in molecular sieve synthesis react to generate TPACoO2, TEACoO2 or TMACoO2 through an acid-base pair strategy, and meanwhile, the quaternary ammonium salt is a template agent in molecular sieve synthesis, so that Co can be directionally packaged in a molecular sieve. According to the synthesis method, the size and dispersity of the Co active phase can be controlled, meanwhile, due to the influence of pore channels and acidity of the molecular sieve, synthesis gas can be converted into aviation kerosene (C8-C16) in a high-selectivity mode, and meanwhile the isomerization degree of paraffin is improved. The invention develops a new route for preparing high-quality aviation kerosene from biogas.

The invention provides a preparation method of a coconut shell carbon and transition metal bifunctional catalyst. The preparation method comprises the following steps: S1, carbonizing and graphenizing coconut shells to obtain graphenized coconut shell carbon; s2, doping the graphene coconut shell carbon with nitrogen and sulfur to obtain nitrogen and sulfur doped graphene coconut shell carbon; s3, preparing a nickel-cobalt-iron LDH catalyst through a hydrothermal method; and S4, combining the nitrogen-sulfur doped graphene coconut shell carbon with a nickel-cobalt-iron LDH catalyst through a water-phase ultrasonic method to prepare the NiCoFe / NSC bifunctional catalyst. The coconut shell carbon and transition metal bifunctional catalyst is applied to the zinc-air battery as a cathode electrocatalyst material, and the electrochemical performance is excellent.

The invention relates to the technical field of catalysts, and discloses a bifunctional catalyst, a preparation method thereof and a method for preparing CO through CO2 hydrogenation catalysis. The catalyst comprises a carrier, a metal component and a metal auxiliary agent, the metal component and the metal auxiliary agent are loaded on the carrier, the carrier is calcium oxide, the metal component is nickel oxide, and the metal auxiliary agent is selected from one or more of manganese oxide, zirconium oxide and cerium oxide. The invention provides a bifunctional adsorbent-catalyst which can selectively adsorb CO2 and catalyze CO2 into CO, and realizes integration of adsorption decarburization and catalytic regeneration. The bifunctional catalyst has a rich pore channel structure, catalytic reaction is facilitated, regulation and control of the structure and performance of the catalyst are achieved by adding different metal auxiliaries, the catalytic activity is more efficient, and meanwhile the stability and durability of the adsorption catalytic activity are guaranteed.