171 results about "Bifunctional catalyst" patented technology

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.

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 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 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.

The invention discloses a method for catalyzing hydrolysis of hexafluorophosphate radicals by using a bifunctional solid acid material, the main active sites of the bifunctional solid acid material in the method are a Brnsted acid site formed by combining protonated sulfate radicals (HSO4 <->) with hydroxyl groups on the surface of TiO2 and a Ti < 4 + > (Lewis acid) site enhanced by induction of the Brnsted acid site, and in the catalytic hydrolysis process, the Brnsted acid site and the Ti4 < + > (Lewis acid) site can be used for catalyzing hydrolysis of the hexafluorophosphate radicals by using the bifunctional solid acid material. Ti4 < + > (Lewis acid site) generates strong adsorption and activation effects on PF6 <->, adjacent HSO4 <-> (Brnsted acid site) and PF6 <-> generate H.. F-P interaction, and the two sites apply a synergistic stretching effect on a P-F bond from different directions, so that a stable regular octahedron structure of PF6 <-> is greatly damaged, a reaction energy barrier of P-F bond breakage is remarkably reduced, efficient hydrolysis of PF6 <-> is realized, and the reaction time is shortened. The method has the advantages that the hydrolysis efficiency is high, the hydrothermal stability is good, extreme acid and alkali environments are not needed, the bifunctional catalyst is easy to regenerate and the like, and a brand new technical path and a solution are provided for harmless treatment of the hexafluorophosphoric acid-containing wastewater.

The invention relates to the technical field of wastewater treatment, in particular to a bifunctional catalyst as well as a preparation method and application thereof. The catalyst comprises noble metal nanoparticles and a porous carbon layer coating the surfaces of the noble metal nanoparticles, the noble metal is selected from one or more of Pd, Rh and Ru; the specific surface area of the porous carbon layer is 150-1000m < 2 > / g, and the pore size distribution is 0.1-5nm; and transition metal elements are doped in the porous carbon layer. By means of the unique structure that the precious metal nanoparticles are coated with the porous carbon layer, dual purposes of one material are achieved, and excellent cathode electro-catalysis nitrate reduction (ENRR) activity and anode sulfide oxidation (SOR) stability are achieved at the same time. According to the catalyst, an ENRR and SOR coupled electro-catalysis system can be constructed at the same time, nitrate in wastewater is efficiently reduced into ammonia with high added value in a single system, sulfide is oxidized into elemental sulfur, and therefore removal of pollutants and recovery of valuable resources are completed synchronously.

The invention discloses a bifunctional mesoporous silica catalytic material and a preparation method thereof.The material is characterized in that mesoporous silica serves as a carrier, two kinds of functional groups including sulfonic acid groups and sulfydryl groups are cooperatively introduced to the surface of a mesoporous framework, and a bifunctional catalyst with acid catalysis and concerted catalysis capabilities is formed; the catalyst can efficiently catalyze condensation of phenol and acetone to prepare bisphenol A. In the preparation process, a sol-gel method is adopted for synthesizing a mesoporous silica carrier, a sulfydryl functional group is introduced through a sulfydryl siloxane compound, meanwhile, phenyl is introduced through a phenyl siloxane compound, then a benzene ring is converted into a sulfonic acid group through sulfonation reaction, and finally the catalytic material of a regular mesoporous structure is obtained, the pore size distribution is 2-50 nm, and the molecular weight of the catalytic material is 100-200. The specific surface area is not less than 200 m / g. The invention provides a novel catalytic technical scheme for efficient and green synthesis of bisphenol compounds, and can be widely applied to the condensation reaction process in the field of fine chemical engineering.

The invention is suitable for the technical field of catalysts for hydrogen production through electrolysis of water, and provides a medium-entropy Prussian blue analogue derivative sulfide catalyst and a preparation method thereof.The preparation method comprises the following steps that Ni (NO3) 2.6 H2O and C6H5Na3O7. 2H2O are dissolved in deionized water, and a solution A is formed through magnetic stirring; dissolving K3 [Co (CN) 6] and K3 [Fe (CN) 6] in deionized water, and magnetically stirring to form a solution B; adding the solution B into the solution A, and stirring at room temperature to obtain a mixed solution; heating the mixed solution in a water bath and stirring; carrying out centrifugal treatment on the mixed solution, separating to obtain a precipitate, washing for multiple times, and carrying out vacuum drying overnight to obtain a FeCoNi-PBA precursor; the FeCoNi-PBA precursor and excessive sulfur powder are placed in two porcelain boats respectively, the two porcelain boats are placed on the downstream and the upstream of a tubular furnace, in the argon atmosphere, the temperature is increased, heat preservation treatment is conducted, and the medium-entropy sulfide named as FeCoNi-S is obtained. The bifunctional catalyst with rich defects and high specific surface area is prepared, and efficient and stable hydrogen production and oxygen production through water electrolysis are achieved.

The invention discloses a cascade bifunctional catalyst, a preparation method thereof and application of the cascade bifunctional catalyst in CO2 high value-added catalytic conversion, and belongs to the technical field of chemical catalysis. The cascade bifunctional catalyst is formed by compounding a sodium-iron-cobalt catalyst, a potassium-copper-zinc-aluminum catalyst and a molecular sieve, and the catalyst can realize high-selectivity preparation of aromatic hydrocarbon by hydrogenation of carbon dioxide (CO2) through an ethanol-coupled olefin conversion route. A new reaction path provided by the constructed cascade bifunctional catalyst can effectively regulate and control front-section reaction product distribution, the mass transfer and heat transfer performance of the catalyst is remarkably optimized, and then the selectivity and reaction efficiency of a target product are improved.

The invention discloses an in-situ growth carbon nanotube loaded iron-cobalt bifunctional catalyst as well as a preparation method and application of the in-situ growth carbon nanotube loaded iron-cobalt bifunctional catalyst, and relates to the technical field of zinc-air batteries. Comprising a nitrogen-iron co-doped carbon nanotube conductive network and iron-cobalt metal atoms loaded on the carbon nanotube conductive network, the nitrogen-iron co-doped carbon nano tube is used as a conductive network, the stable structure of the carbon nano tube is not affected, meanwhile, the carbon nano tube has a rich pore structure, rich iron-based active sites and a high specific surface area, iron-cobalt metal atoms are attached to the carbon nano tube more easily, and excellent catalytic performance is shown; the preparation method comprises the following steps: preparing a carbon nanotube conductive network, then loading iron-cobalt metal atoms on the conductive network, so that more iron-cobalt metal atoms are uniformly and firmly attached to the carbon nanotube conductive network, and through the interaction between iron-cobalt diatom catalytic active sites, the dual-function catalysis of ORR and OER is realized, and the performance of the zinc-air battery is improved.

The application discloses a method for preparing aromatic hydrocarbons by coupling conversion of carbon monoxide and polyolefins, and belongs to the technical field of polyolefin plastic conversion and recycling. The method uses carbon monoxide and polyolefin plastics as reaction raw materials, and a bifunctional catalyst composed of metals, metal oxides and molecular sieves as a catalyst to perform a conversion reaction. Since the carbon monoxide can come from carbon resources such as coal, biomass and natural gas, the reaction process can not only realize optimal utilization of carbon resources, but also change waste polyolefin plastics into treasure, realize high-value utilization, generate high-value-added aromatic hydrocarbon products, has high product yield and product selectivity, the aromatic hydrocarbon yield can reach 50-80%, the proportion of benzene, toluene and xylene in the aromatic hydrocarbons is greater than 60%, and the catalyst can be reused after simple regeneration treatment. The method is a new technology for comprehensive utilization of polyolefin waste plastics and utilization of carbon monoxide, and has good application prospect.

The application discloses a preparation method of 1T phase molybdenum sulfide and application thereof, and the method comprises the following steps: under the action of an applied magnetic field, taking ammonium molybdate tetrahydrate and thiourea as a molybdenum source and a sulfur source respectively, taking cobalt nitrate hexahydrate as an initiator, and generating 1T phase molybdenum sulfide in a reaction process through a one-step hydrothermal method. The 1T phase molybdenum sulfide is used for preparing an oxygen evolution and hydrogen evolution bifunctional electrode. The application utilizes a magnetic field and Co atoms to convert a hydrothermal synthesis product from 2H phase molybdenum sulfide into 1T phase molybdenum sulfide, and prepares a HER and OER bifunctional catalyst with high conductivity and excellent catalytic performance. The method is simple and economical, the effect is remarkable, the problem of difficulty in preparing 1T phase molybdenum sulfide catalyst is solved, and the method has great application value in the field of electrochemical catalysis.

The application discloses a method for synthesizing N-hydroxyethyl methyl benzylamine, and belongs to the technical field of pharmaceutical intermediates. The method comprises the following steps: continuously pumping a mixed solution of N-methyl benzylamine and ethylene carbonate into a micro-channel reactor filled with a bifunctional MOF catalyst UiO-66-NH2; continuously performing a flow catalytic reaction under heating and pressurizing conditions; and achieving a supercritical state of byproduct carbon dioxide in the reaction system; and obtaining N-hydroxyethyl methyl benzylamine after separating the reaction effluent under reduced pressure. The method has high raw material conversion rate, product selectivity and space-time yield.

The invention relates to a Ga-ZSM-5 catalyst, a preparation method thereof and an n-butane catalytic cracking method. The preparation method comprises the following steps: mixing an H-type ZSM-5 molecular sieve with gallium oxide, carrying out reduction treatment in a reducing atmosphere, and carrying out oxidation treatment to obtain the Ga-ZSM-5 catalyst. The method comprises the following steps: mixing a metal source with an H-type ZSM-5 molecular sieve, and carrying out atmosphere treatment to obtain the Ga-ZSM-5 bifunctional catalyst. Compared with a traditional impregnation method for introducing metal, the method disclosed by the invention is simpler and more convenient in operation steps, and the catalyst obtained by the method disclosed by the invention can achieve catalytic activity equivalent to that of the catalyst obtained by the impregnation method. Compared with unmodified H-type ZSM-5, the Ga-ZSM-5 catalyst disclosed by the invention is used for the catalytic cracking reaction of n-butane, and can effectively improve the conversion rate of n-butane and improve the yield of low-carbon olefin and light aromatic hydrocarbon.

The application discloses a gradient electron regulation type noble metal-transition metal bifunctional catalyst and a preparation method and application thereof, and comprises active metal components A, auxiliary active metal components B, oxide carriers C and surface electron regulation components D. In the application, the noble metal is enriched on the outer layer of the carrier, directly participates in the surface catalytic reaction, the catalytic efficiency of unit mass noble metal is significantly improved, and excellent hydrogenation and dehydrogenation performance can be realized. The inner layer transition metal promotes hydrogen overflow and hydrogenation activity, the outer layer noble metal provides efficient dehydrogenation sites, and the two realize ordered division and cooperation in space through the gradient distribution structure, thereby solving the problem of disordered distribution of traditional two metals and insufficient cooperation effect. The gradient distribution structure reduces the migration and agglomeration tendency of metal particles in high-temperature circulation, the oxygen vacancies and basic sites of the oxide carrier inhibit carbon deposition, and the catalyst can maintain high activity and stability in multiple hydrogenation-dehydrogenation cycles, and the cycle life is significantly better than that of a conventional co-impregnated bimetallic catalyst.

The application discloses a supported bifunctional catalyst for treating chlorinated organic matters in medical waste salt smelting flue gas at low temperature and a preparation method and application thereof. The perovskite oxide is loaded on a molecular sieve carrier through a sol-gel method, and the redox performance of the catalyst is effectively controlled by adopting a B-site doping strategy, so that the carrier acid sites and the active component redox sites are synergized. The prepared catalyst can achieve a target pollutant removal rate of more than 95% at a temperature far lower than a traditional secondary combustion temperature (260 DEG C), and the activity is stable in continuous operation, thereby avoiding the generation of secondary pollution such as dioxin. The application provides an ideal scheme for replacing a high-energy-consumption and high-cost secondary combustion chamber treatment process, has significant energy-saving and environmental protection advantages, and provides a feasible technical path for realizing industrial purification treatment of medical waste salt.

This invention discloses a method for synthesizing a bifunctional PdCu catalyst for electrocatalytic hydrogenation-coupled oxidation of HMF. The method involves chemically oxidizing a copper foam framework to induce in-situ growth of nanowire structures on the surface of the copper foam nanowire substrate. A palladium salt is used as the palladium source and loaded onto the copper foam nanowire substrate in a cluster form. The prepared catalyst possesses a nanowire structure that facilitates the loading of Pd clusters, generating more active sites. The Pd clusters provide active hydrogen (H*) to accelerate electron transport, thereby achieving efficient hydrogenation of high-concentration HMF to BHMF at the cathode. Simultaneously, when applied to the anode, it enables efficient HMF conversion to FDCA. This material is suitable for the continuous production of high-value-added products FDCA and BHMF through electrocatalytic hydrogenation-coupled oxidation. The catalyst exhibits high activity, high stability, and high electron utilization, demonstrating significant potential for industrial application.

The invention belongs to the technical field of flue gas purification, and discloses a bifunctional catalyst which is simple in preparation process, excellent in low-temperature catalytic activity, N2 selectivity, sulfur resistance and water resistance and capable of removing CO and NOx at the same time, and a preparation method and application of the bifunctional catalyst. The bifunctional catalyst for simultaneously removing CO and NOx comprises microspheres formed by assembling nano-particles and a shell layer coated on the surfaces of the microspheres, the nanoparticles are mainly composed of Cu, V and O; and the shell layer is mainly made of TiO2. The preparation method of the bifunctional catalyst comprises the following steps: (1) taking basic cupric carbonate and V2O5 as raw materials, and synthesizing Cu3V2O7 (OH) 2.2 H2O microspheres through a hydrothermal method; and (2) synthesizing the bifunctional catalyst by using the Cu3V2O7 (OH) 2.2 H2O microspheres, tetrabutyl titanate and ammonia water as raw materials through a hydrothermal method.

The invention discloses a bifunctional catalyst based on a core-shell structure and a molecular sieving mechanism, the catalyst sequentially comprises a core layer, a mesoporous isolation layer and a shell layer from inside to outside, the core layer is a Fe-Ce composite oxide loaded on a modified red mud carrier, and is used for catalyzing CO2 hydrogenation to generate CO; the shell layer is a single atom site of a ZnO-ZrO2 solid solution loaded noble metal Pt or Pd and is used for catalyzing CO hydrogenation to generate CH3OH; the mesoporous isolation layer is located between the core layer and the shell layer, the aperture of the mesoporous isolation layer is smaller than or equal to 2 nm, the surface is hydrophobically modified by long-chain alkylsilane, and the static water contact angle is larger than or equal to 150 degrees. According to the invention, by constructing a'core-shell-isolation layer 'ternary structure with a super-hydrophobic mesoporous isolation layer, efficient cascade catalysis of a reaction for preparing methanol through CO2 hydrogenation is realized, the catalyst has excellent performance and also has excellent water poisoning resistance and sulfur poisoning resistance, the cost is greatly reduced by adopting industrial wastes, and the catalyst is suitable for industrial production. High performance, long service life and industrial feasibility are realized.

This invention discloses a ZnCoSe / NC bifunctional catalyst, its preparation method, and its applications, belonging to the field of electrocatalytic materials technology. Addressing the technical problems of insufficient catalytic activity and limited active site types in existing transition metal selenide electrocatalysts, the catalyst prepared in this invention comprises a nitrogen-doped carbon support, ZnSe and CoSe particles supported on the support, and Co single atoms dispersed within the support. By rationally controlling the proportions and interfacial structures of each component, a highly efficient synergistic catalytic system is constructed. The ZnCoSe / NC catalyst exhibits excellent ORR performance, and the current retention rate remains at 97.6% after a 10-hour stability test; it also demonstrates competitive oxygen evolution reaction (OER) activity. This invention develops a high-performance, low-cost ORR / OER bifunctional electrocatalyst, providing new ideas and methods for the design and preparation of non-noble metal-based bifunctional catalysts.

The invention discloses a castor oil-polycarbonate copolymer for plasticizing polyvinyl chloride and a preparation method of the castor oil-polycarbonate copolymer. The castor oil-polycarbonate copolymer can be prepared by adopting solution or bulk polymerization, under the catalytic action of a Lewis acid-base pair or an initiation-catalysis bifunctional catalyst, firstly, an epoxy monomer and an initiator are subjected to reaction chain initiation, then chain transfer occurs, and a polycarbonate chain segment continues to grow on castor oil, so that the castor oil-polycarbonate copolymer is obtained. Compared with the existing commercialized polyvinyl chloride plasticizer, the castor oil-polycarbonate copolymer has the advantages of greenness, degradability, excellent toughening effect and lower preparation cost, has the advantages of no toxicity, difficulty in migration or leaching and the like due to a star-shaped structure and high molecular weight, and has a wide application prospect.

The present invention relates to a reactor with an arrangement of at least two successive reactor layers comprising layers of bi-functional catalysts and mono-functional catalysts for improving the cold flow properties of higher hydrocarbon fractions, and to a process for the hydroconversion of a reaction fluid comprising a middle distillate fraction with a Watson K-factor > 11.8 in the presence of sulfur-containing organic compounds and / or nitrogen-containing organic compounds.

This invention relates to the field of ethylene glycol preparation, specifically to a method for the direct production of ethylene glycol from ethylene. The method includes: reacting ethylene with hydrogen peroxide in the presence of an oxidative hydration bifunctional catalyst to obtain a material containing ethylene glycol, and collecting the product after separation via a metal-ceramic composite membrane. Using this method, ethylene glycol can be produced in a one-step process. The reaction exhibits high hydrogen peroxide utilization, ethylene conversion rate, and ethylene glycol selectivity, along with high catalyst activity and stability. During separation, the transmembrane pressure difference is small, allowing the separation system to operate continuously for extended periods. The resulting product liquid has a low catalyst concentration.

The invention relates to a bifunctional catalyst of HZSM-5 molecular sieve coated FexOy coated MnO2 as well as a preparation method and application of the bifunctional catalyst. The bifunctional catalyst comprises an inner core, a middle layer and a shell, the inner core comprises iron oxide; the middle layer comprises manganese dioxide; the shell comprises an HZSM-5 molecular sieve. According to the bifunctional catalyst disclosed by the invention, the iron oxide FexOy and the HZSM-5 molecular sieve can be effectively isolated by arranging the middle layer, so that the situation that reduction and carbonization of the iron oxide FexOy are influenced due to strong interaction between the iron oxide FexOy and the HZSM-5 molecular sieve is avoided; when the catalyst is applied to CO hydrogenation reaction, under the condition that the one-way CO conversion rate is higher than 65%, C8-C16 can account for more than 35% of hydrocarbon products in terms of selectivity of synthetic products, and the content of isohydrocarbon is not lower than 50%.

The application provides a synergistic catalyst for catalyzing propylene hydroperoxy epoxidation and a preparation method thereof. Based on the process design concept of "synergistic catalysis", two catalysts with specific composition and performance are selected, including a monatomic gold catalyst and a cluster or granular gold catalyst, and the two catalysts are mechanically mixed according to different proportions to obtain the synergistic catalyst. The synergistic catalyst can not only break through the limitation that the Ti site must exist on the traditional supported Au-Ti bifunctional catalyst, reduce the difficulty of catalyst development, but also greatly improve the activity of the propylene hydroxylation reaction, greatly improve the atomic utilization rate and improve the stability of the catalyst. The synergistic catalyst has important significance for developing high-performance and high-stability catalysts required by industry.

The invention discloses a composite electrolyzed water catalyst based on a coal gangue residual carbon substrate and ligand insertion layered double hydroxides and a preparation method of the composite electrolyzed water catalyst, and belongs to the technical field of electro-catalysis and new energy materials, and the preparation method comprises the following steps: pretreatment and functionalization of coal gangue residual carbon, in-situ growth of LDH (Layered Double Hydroxides), and preparation of the composite electrolyzed water catalyst. And after the ligand is inserted, preparing the composite bifunctional catalyst. The cost is reduced by utilizing the waste derived carbon, the electronic structure of LDH is effectively regulated and controlled through a ligand insertion strategy, the active specific surface area is increased, and meanwhile, excellent charge transmission capacity is ensured through strong interface coupling. The obtained composite material has high catalytic activity, low overpotential and excellent stability on both oxygen evolution reaction and hydrogen evolution reaction, is a bifunctional water electrolysis catalyst with low cost and high performance, and has a wide application prospect in the field of green hydrogen production.

This invention discloses a method for producing aromatics from carbon dioxide via a bifunctional catalyst of zinc oxide-zirconia@C / hierarchical porous nano-ZSM-5 molecular sieve. The invention addresses the problems of low selectivity for aromatics and excessively high selectivity for byproducts in existing catalysts used in the carbon dioxide hydrogenation conversion reaction. The method involves pyrolyzing a zinc-modified organometallic complex under a nitrogen atmosphere to prepare a ZnO-ZrO2@C composite metal oxide, which is then mixed with a modified hierarchical porous nano-ZSM-5 molecular sieve to form a bifunctional catalyst. This catalyst is then loaded into a fixed-bed reactor, activated under a nitrogen atmosphere, and then a mixture of carbon dioxide and H2-Ar gas is introduced into the reactor. Aromatics are produced under controlled reaction conditions. The bifunctional catalyst used in this invention improves the diffusion performance of reaction intermediates and aromatic products, suppresses side reactions such as reverse water-gas shift and excessive hydrogenation, and significantly improves the carbon dioxide conversion rate and the selectivity for tetramethylene-rich aromatics.

This invention belongs to the field of catalytic chemical technology and discloses a method for preparing a Ni2P / SAPO-11 catalyst and its application. Ni(NO3)2·6H2O and (NH4)2HPO4 are dissolved in deionized water to obtain a mixed solution A. Citric acid is dissolved in mixed solution A and ultrasonically treated until completely dissolved to obtain an impregnation solution B. Impregnation solution B is added dropwise to a SAPO-11 support, and after aging, drying, and calcination, a catalyst precursor is obtained. The precursor is reduced under a hydrogen atmosphere to prepare the active phase, thus obtaining a CA-modified CA(x)-Ni2P / SAPO-11 catalyst, where x is the CA / Ni molar ratio. This invention, by regulating the metal-acid active center balance with citric acid, promotes the synergistic effect of bifunctional active centers, significantly improving the catalyst's ability to simultaneously perform hydrodesulfurization and hydroxyl skeletal isomerization. This invention provides a new method for preparing bifunctional catalysts with deep desulfurization and olefin skeletal isomerization activities.