282 results about "Bifunctional catalyst" patented technology

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 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 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 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.

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 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.

The invention discloses a preparation method and application of a Beta molecular sieve catalyst rich in outer surface B acid, and solves the technical problem that the existing efficient catalyst is unstable in structure. The preparation method comprises the following steps: synthesizing the H-Beta carrier rich in the outer surface B acid: drying Beta zeolite raw powder without removing a template agent, then carrying out ion exchange for 2 hours by using an NH4Cl aqueous solution, washing a solid with water, drying, repeating the ion exchange process, and roasting the obtained ion exchange solid at 550 DEG C for 4 hours to obtain the H-Beta carrier rich in the outer surface B acid; and preparing the supported bifunctional catalyst: loading the metal Ir onto the H-Beta carrier rich in the B acid on the outer surface by an equivalent impregnation method. The Beta molecular sieve disclosed by the invention is rich in outer surface B acid, is used for a catalytic reaction for synthesizing high-density endothermic aviation fuel by converting polycycloalkane, provides higher reaction active site density and promotes diffusion of macromolecular cycloalkane.

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 catalysts, and provides a Ce-doped graphene NiFe-LDH bifunctional catalyst as well as a preparation method and application thereof. The preparation method of the bifunctional catalyst comprises the following steps: performing hydrothermal reaction on graphene oxide, a nickel source, an iron source and a cerium source in an aqueous solution containing a protective agent and a precipitator at 100-120 DEG C to obtain the Ce-doped graphene NiFe LDH bifunctional catalyst. According to the invention, NiFi-LDH is used as a framework, synergistic doping of Ce and transition metals (Ni, Fe) on graphene-loaded layered double hydroxides (LDH) is realized, and the graphene-loaded layered double hydroxides have substantially high porosity and can be printed on a gas diffusion electrode as a bifunctional catalyst layer to improve the electrochemical reaction efficiency. The preparation method provided by the invention has the characteristics of mild synthesis conditions, easily available raw materials, simple process and strong expandability, and is easy to realize industrial application. The catalyst provided by the invention has excellent OER and HER performances, and the activity and stability of the NiFe-LDH catalyst in alkaline water electrolysis are effectively improved.

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 relates to the technical field of catalytic chemistry and waste plastic recycling, and discloses a metal / MoOx / molecular sieve bifunctional catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out ion exchange on a molecular sieve and an ammonium nitrate solution; completely dissolved molybdenum salt is added, and ultrasonic dispersion, suction filtration, washing and drying are performed; completely dissolved urea and metal salt are added, hydro-thermal synthesis is carried out, and drying is carried out; and carrying out suction filtration, washing and drying to obtain a metal / MoOx / molecular sieve precursor, and calcining and reducing to obtain the metal / MoOx / molecular sieve bifunctional catalyst. The bifunctional catalyst disclosed by the invention is simple in preparation process, relatively high in catalytic activity, excellent in selectivity, good in stability, convenient in reaction operation, mild in condition and suitable for industrial popularization and application; moOx contributes to hydrodeoxygenation, and metal sites contribute to catalytic hydrogenation; the efficient cyclic utilization of resources is realized, and the problem of environmental pollution is also effectively relieved.

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 difunctional self-regulation WO3-based hydrogen battery catalyst and a preparation method thereof, and belongs to the technical field of hydrogen battery catalyst materials. The supported catalyst (Pt / WO3) with Pt nanoclusters anchored on the surface of a WO3 nanosheet growing on carbon fiber paper is prepared by a simple hydrothermal and electro-deposition two-step method. An electrochemical HER / HOR performance test is carried out by using an electrochemical workstation under an acidic condition, and a hydrogen battery is further assembled to evaluate the discharge performance of the hydrogen battery as a negative electrode catalyst under normal temperature and low temperature conditions, so that an effective way is provided for developing a high-performance bifunctional catalytic material suitable for a hydrogen battery negative electrode.

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 present disclosure relates broadly to ammonia electrochemical cells. The ammonia electrolysis cell may comprise: a chamber for containing an electrolyte; two electrodes disposed within the chamber; and an anion exchange membrane disposed between the electrodes, wherein each electrode comprises a bifunctional catalyst having ammonia oxidation reaction activity and hydrogen evolution reaction activity, and wherein each electrode is capable of alternating in polarity when subjected to an alternating potential. There is also disclosed herein a method of operating an ammonia electrolysis cell as well as the use of an ammonia electrolysis cell to produce hydrogen from ammonia.

The invention discloses a free radical addition tandem cyclization reaction of N-aryl acryloylbenzamide or 2-aryl-N-acryloyl indole or N-methacryloyl-2-phenylbenzimidazole with potassium selenocyanate under visible light conditions, using cheap KSeCN as a selenocyanation reagent, potassium persulfate and the like as an oxidant, 2,4,6-triphenyl tetrafluoroborate and the like as a phase transfer catalysis and photocatalytic bifunctional catalyst to carry out a selenocyanation cyclization reaction. The reaction synthesizes selenocyanide isoquinoline-1,3 (2H, 4H)-diketone, indole [2,1-a] isoquinolinone and benzimidazole [2,1-a] isoquinoline-6 ​​(5H)-one in moderate to excellent yields under room temperature and visible light. The method has the advantages of mild reaction conditions, good substrate compatibility, large-scale synthesis, simple operation, cheap and easily available raw materials, simple preparation, and stable structure.

The invention relates to the technical field of organic chemical synthesis, and discloses a dibenzoylmethane synthesis process which comprises the following steps: carrying out functional modification on the surface of a carrier, carrying out ionic liquid modification treatment, introducing self-healing functional molecules, loading bifunctional active sites, regulating and constructing a phase interface, periodically recovering performance, and catalyzing Claisen condensation reaction to prepare dibenzoylmethane. Long-term stable operation of the supported bifunctional catalyst is realized through self-healing functionalized ionic liquid modification, the problems that a traditional homogeneous catalyst is difficult to separate and active sites of a multifunctional catalyst interfere with each other are solved, the service life of the catalyst is remarkably prolonged, and the reaction efficiency of the catalyst is remarkably improved; and a new technical path is provided for continuous clean production of the beta-diketone compound.