372 results about "Heterogeneous catalysis" patented technology

The invention relates to the technical field of industrial wastewater treatment, in particular to a heterogeneous catalytic oxidation process and system for treating organic wastewater. The heterogeneous catalytic oxidation system for treating the organic wastewater comprises an acid adjusting unit, a booster pump, a catalytic oxidation reaction unit and a pH callback pipeline mixer which are communicated in sequence, the catalytic oxidation reaction unit comprises a plurality of heterogeneous catalytic oxidation reactors which are connected in series, and the treatment temperatures and the treatment pressures of the heterogeneous catalytic oxidation reactors are sequentially reduced along the flowing direction of wastewater. The heterogeneous catalytic oxidation reactors connected in series in the system provided by the invention do not need to be pressurized step by step, are simple and efficient, and have feasibility. The heterogeneous catalytic oxidation reactors are adopted, so that the loss of the catalyst can be avoided, the continuous addition of the catalyst is not needed, the operation cost is reduced, meanwhile, the function of configuring different catalysts in each stage of heterogeneous catalytic oxidation reactor can be realized, and the degradation degree of organic matters and the precise regulation and control of each stage of target products are realized.

The invention discloses a method for preparing furfuryl amine by reductive amination of biomass-based furfural, which comprises the following steps: adding furfural, a catalyst, ammonia water and a solvent into a closed reaction kettle in proportion, replacing air in the reaction kettle with high-purity hydrogen, and reacting in an oil bath pan for a period of time to obtain a target product furfuryl amine, the nano-catalyst provided by the invention is a nitrogen-doped porous hollow carbon sphere loaded nano bimetallic catalyst, takes noble metal and non-noble metal as a metal active center together, and has adjustability of macroscopic size and microstructure at the same time; the method has the advantages of simple reaction system, mild conditions, no pollution to the environment, high efficiency, energy conservation, low cost, few byproducts, high yield, high selectivity and the like, the furfural is efficiently converted into furfuryl amine at low temperature and low pressure within a short time, the used heterogeneous catalyst is stable and easy to recover, a new thought and direction are provided for enterprise production and scientific research, and the method is suitable for industrial production. The method has great significance on development and utilization of biomass-based furfural.

The present invention provides a cyclic carbonate synthesis method, and belongs to the technical field of organic ester compound synthesis, and the cyclic carbonate synthesis method comprises the following steps: S1, 1, 3-propylene glycol, a dehydrating agent and a catalyst are added into a high pressure reaction kettle, and CO2 is introduced into the high pressure reaction kettle for a reaction; s2, after the reaction is finished, after the high-pressure reaction kettle is cooled to the room temperature, redundant gas in the high-pressure reaction kettle is discharged, after the gas in the high-pressure reaction kettle is completely discharged, the high-pressure reaction kettle is opened, the catalyst is filtered out, and the solution is subjected to vacuum-pumping separation to obtain a target product; the catalyst is a heterogeneous catalyst MxOy (at) Zn-dpot. Carbon dioxide conversion is carried out in a chemical utilization mode, a chemical product trimethylene carbonate can be produced, the synthesis route is easy to operate, and after the MxOy at Zn-dpot catalyst is added, the yield is high, the high additional value is achieved, and the green chemistry concept is met.

The invention relates to the technical field of heterogeneous catalysis and fine chemical engineering, and discloses a rhodium-tungsten para-site MOF-based catalyst as well as preparation and application thereof. The invention relates to a rhodium-tungsten para-site MOF-based catalyst, which is composed of a catalytic active component, a metal additive and a carrier. The rhodium-tungsten para-site MOF-based catalyst provided by the invention takes a metal organic framework material as a carrier, an active component Rh and a metal additive W are stably anchored on the surface of the carrier, and an Rh-WOx para-site is successfully constructed; the rhodium-tungsten para-site MOF-based catalyst provided by the invention shows excellent catalytic activity and excellent cycle stability in olefin hydroformylation reaction, and overcomes the technical bottlenecks that noble metals in a homogeneous catalysis system are easy to lose and energy consumption is high in a product separation process; an efficient and stable catalyst design thought is provided for olefin hydroformylation reaction, and the catalyst has a good industrial application prospect.

The invention discloses a method for exploring a heterogeneous catalytic reaction network based on a deep potential energy surface model, and the method comprises the steps: carrying out the accurate prediction of the free energy change of all possible element reactions on a catalyst through the combination of transfer learning and a density functional theory, and constructing a reaction network diagram based on a graph theory method; an improved Dijkstra method is used for searching a reaction network diagram to determine a reaction mechanism, and the selectivity of the catalyst is explored based on a Markov chain method. According to the technical scheme provided by the invention, when the CO2 reduction reaction mechanism on the monatomic alloy is explored, the prediction error MAE of the electron energy of each intermediate is only 0.16 eV, the calculated amount is reduced by 90%, the dominant path of the CO2 reduction reaction is visually displayed, and a new normal form is provided for complex mechanism exploration and catalyst screening.

The invention provides a charcoal-loaded iron-based catalyst suitable for heterogeneous catalysis as well as a preparation method and application of the charcoal-loaded iron-based catalyst. The preparation method comprises the following steps: firstly, activating and modifying tea leaves by adopting a potassium hydroxide solution, and then carrying out heat-preservation pyrolysis in a carbon dioxide atmosphere to obtain tea-leaf-based biochar; uniformly mixing an iron source, a manganese source, a cerium source and a citric acid solution; adding tea-based biochar, uniformly mixing, and drying to obtain a precursor; and heating the precursor to 400-650 DEG C, and carrying out heat preservation and pyrolysis to obtain the biochar-loaded iron-based catalyst. The biochar-loaded iron-based catalyst has excellent degradation and removal effects and cycle stability on xylene.

The invention relates to a heterogeneous catalysis technology, and aims to provide a method for improving the yield of components of aviation kerosene prepared by ethylene oligomerization through combination of a fixed bed and a slurry bed. Comprising a fixed bed reactor and a slurry bed reactor which are sequentially connected in series, the fixed bed reactor is filled with a metal modified mesoporous zeolite molecular sieve catalyst, and the slurry bed reactor is filled with a mesoporous zeolite molecular sieve catalyst. The method comprises the following steps: firstly, carrying out ethylene oligomerization reaction in a fixed bed reactor to generate a product containing C4-C8 olefin; the reaction product is directly introduced into the fixed bed reactors connected in series for secondary reaction, and the final product comprises C5-C16 + liquid phase olefin as an aviation fuel component. By adopting a fixed bed-slurry bed reactor combined method, the ethylene conversion rate can be greatly improved; secondary oligomerization is carried out by using an acidic mesoporous zeolite molecular sieve catalyst, so that the selectivity of aviation kerosene components is improved; the mesoporous catalyst prepared by an alkali treatment method has a good diffusion effect and keeps high activity for a long time.

The invention discloses an internal-acid and external-alkali type organic-inorganic hybrid molecular sieve catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials and chemical processes. According to the catalyst, a hydrogen type Beta molecular sieve is used as an acidic inner core, polyvinylpyrrolidone (PVP) is used as an organic shell, and a unique inner-acid outer-alkali structure is formed. The preparation method comprises the following steps: hydrothermally synthesizing a hydrogen type Beta molecular sieve with a specific silica-alumina ratio, and then coating PVP through surface adsorption. The catalyst is used for catalyzing the condensation of methylal and trioxymethylene under mild conditions (40-70 DEG C and normal pressure) to prepare polyoxymethylene dimethyl ethers (DMMn). The PVP shell covers acidic sites on the outer surface of the molecular sieve to form an external neutral / weak base and internal strong acid microenvironment, so that the secondary side reaction of the product is effectively inhibited, the trioxymethylene conversion rate of more than 98% and the DMMn selectivity of more than 96% can be obtained in the reaction at 50 DEG C and normal pressure, the product distribution can be regulated and controlled, and the traditional Anderson-Schulz-Flory distribution limitation is broken through. The catalyst disclosed by the invention has the advantages of high activity, high selectivity, mild conditions and easiness in separation, and has a good industrial application prospect.

The present invention discloses a method for regulating spinel-type high-entropy oxides using electrospinning. The method is characterized in that metal sources, polyacrylonitrile, and dimethylformamide of varying concentrations are fully mixed to form a precursor solution, followed by preparing a spinel-type high-entropy oxide having a nanofiber structure by electrospinning. Results show that, compared to conventional methods for preparing high-entropy oxides, electrospinning facilitates a lower phase transition temperature and promotes the formation of nanoscale high-entropy oxides. Furthermore, the fibers formed are significantly affected by the precursor solution. By varying the amount of total metal added, the final fiber state of the catalyst can be effectively regulated, exhibiting significant differences in ethyl acetate catalytic oxidation activity. The preparation process is simple, enhancing the application value of high-entropy oxides in the field of heterogeneous catalysis.

The invention discloses application of a supported heterogeneous catalyst of oxide and copper-manganese spinel in preparation of acetaldehyde by anaerobic dehydrogenation of ethanol, and belongs to the technical field of heterogeneous catalysis for preparation of acetaldehyde and hydrogen by anaerobic dehydrogenation of ethanol. The reaction is carried out in a fixed bed reactor, under the conditions that the reaction atmosphere is nitrogen, the reaction temperature is 280 DEG C and the mass space velocity is 66.1 h <-1 >, the ethanol conversion rate is 72.5%, the acetaldehyde selectivity is 95.0%, and the space time yield of acetaldehyde based on the copper-manganese composite oxide is 43.5 h <-1 >, so that high-selectivity preparation of acetaldehyde and hydrogen under relatively mild conditions is realized; the system has the remarkable advantages of simple catalyst preparation, high catalytic activity under the condition of high mass airspeed, high space-time yield of acetaldehyde, high atom utilization rate of the system, good stability and the like. The CuMnTi-1 catalyst can be stabilized for more than 70 hours, the CuMnTi-1 improves the utilization rate of copper and manganese, improves the catalytic performance, reduces the demand quantity of copper-manganese spinel in the reaction, and reduces the overall cost of catalyst preparation.

The invention discloses a chitosan-based coupling reaction catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: sequentially modifying chitosan by using an aromatic aldehyde compound and halogenated carboxylic acid to prepare modified chitosan with multiple complexing sites of imino, carboxyl and hydroxyl, taking the modified chitosan as a carrier, and complexing the capturing sites with palladium salt to prepare a catalyst of a functional chitosan-loaded Pd complex. Through a multi-site synergistic complexing effect, the catalyst shows excellent catalytic efficiency and stability in a coupling reaction. Depending on multi-site complexing metal Pd, after the catalyst is recycled for multiple times, the metal falling amount is lower than 0.1%, and the defect that metal of a traditional heterogeneous catalysis system is prone to loss is overcome. In the preparation process, the environment-friendly chitosan with relatively high biocompatibility is used as an initial raw material, so that the preparation method has the advantages of low production energy consumption, environment-friendly and efficient catalytic process, good cycle performance and the like, and has a wide industrial application prospect.

The invention discloses a graded porous mordenite catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis and chemistry and chemical engineering. The preparation method comprises the following steps: carrying out hydrolysis-polycondensation reaction on a silicon source, an aluminum source, an alkali source and water, after the reaction is completed, adding an alpha, omega-biquaternary ammonium salt surfactant as a template agent, and carrying out template-oriented self-assembly reaction to obtain gel; carrying out hydrothermal crystallization treatment on the gel to obtain zeolite raw powder; roasting the zeolite raw powder for the first time to remove the template agent so as to obtain roasted zeolite; and carrying out ion exchange treatment on the roasted zeolite, and roasting again to obtain the graded porous mordenite catalyst. According to the invention, the alpha, omega-biquaternary ammonium salt surfactant is used as the template agent to prepare the hierarchical porous structure catalyst with both inherent micropores and uniform mesopores, so that mass transfer can be improved and acidic sites can be optimized.

The present invention relates to the technical field of polymer preparation. Disclosed are a covalent organic framework material, and a preparation method therefor and a use thereof. The preparation method for the covalent organic framework material comprises the following step: subjecting an organic aldehyde and an organic amine to a condensation reaction in a deep eutectic solvent to obtain the covalent organic framework material, wherein the deep eutectic solvent is a two-component eutectic liquid composed of menthol and acetic acid. The temperature for the reaction is 25-120ºC, and the time for the reaction is 1-72 hours. The deep eutectic solvent composed of menthol and acetic acid used in the present invention has good dissolution properties for organic matters, and can also efficiently catalyze the condensation reaction between the organic amine and the organic aldehyde. The prepared covalent organic framework material exhibits high crystallinity and has good applications in the fields of adsorptive separation, heterogeneous catalysis, energy storage, etc. The present method has mild reaction conditions, simple operation, and good universality, is conducive to industrial large-scale production, and conforms to the concept of green chemistry.

The invention discloses an iron-loaded sulfonated carbon nitride heterogeneous catalyst as well as a preparation method and application thereof, and belongs to the field of heterogeneous catalysts. The iron-loaded sulfonated carbon nitride heterogeneous catalyst consists of monatomic Fe and a sulfonated graphite phase carbon nitride carrier, so that the prepared iron-loaded sulfonated carbon nitride heterogeneous catalyst can catalyze the reaction of benzoxazole and absolute ethyl alcohol, is high in catalytic efficiency, can catalyze the reaction of benzimidazole or benzothiazole and absolute ethyl alcohol, and is high in catalytic efficiency. Therefore, 2-(1-hydroxyethyl)-benzimidazole or 2-(1-hydroxyethyl)-benzothiazole is synthesized, and concentrated acid does not need to be used as a catalyst in the synthesis process. The sulfonation degree of the iron-loaded sulfonated carbon nitride heterogeneous catalyst can be regulated and controlled, the iron-loaded sulfonated carbon nitride heterogeneous catalyst can catalyze the construction of a directional C-C bond, and the iron-loaded sulfonated carbon nitride heterogeneous catalyst keeps stable in the reaction process and can be recycled for 5 times or more.

The invention belongs to the technical field of novel material catalysis, and particularly relates to a hollow mesoporous silica supported phosphotungstic acid catalyst and a preparation method and application thereof. According to the invention, the advantages of high specific surface area and regional effect performance of hollow mesoporous silica and the characteristic of adjustable acidity of vacancy heteropolyacid quaternary ammonium salt are innovatively combined, and the cationic surfactant is loaded on the surface of the hollow mesoporous silica, so that the contact surface of raw materials is effectively increased, efficient conversion of reactants is assisted, and the reaction efficiency is improved. The supported catalyst with efficient catalysis and stable performance is obtained. The catalyst can be used for a reaction for preparing glutaraldehyde through heterogeneous catalysis of cyclopentene oxidation, and the reaction condition is mild. Experiments show that under the catalytic system, the cyclopentene conversion rate can reach 90% or above, the glutaraldehyde selectivity is improved to 75% or above, double improvement of the cyclopentene conversion rate and the glutaraldehyde selectivity is successfully achieved, meanwhile, the advantage that the catalyst is easy to separate is achieved, and an efficient solution is provided for industrial application of synthesis of glutaraldehyde through cyclopentene oxidation.

As disclosed herein, solid heterogeneous catalysts, meaning catalysts having a different phase than the reacting medium, may be used in combination with hydrothermal treatment conditions to degrade, remove, and / or de-fluorinate PFAS solutions. As described herein, heterogeneous catalysts can be tunable, recyclable, and easy to implement in traditional treatment systems or processes. A heterogeneous catalyst, such as 5% ruthenium on carbon catalyst (Ru / C) or tetragonal zirconium dioxide (t-ZrO2), can be applied or added during hydrothermal treatment of PFAS-contaminated solutions. In some examples, the combination of the heterogeneous catalyst and hydrothermal treatment may achieve over 99% degradation of PFAS contaminants. Applying or adding the heterogeneous catalyst during hydrothermal treatment of PFAS may also achieve over 20% defluorination of the PFAS. In some examples, a base amendment may further be added or applied to the treatment of the PFAS contaminants to aid in the degradation and / or recovery of the contaminants. For example, a stoichiometric excess of base amendments, such as (NaOH), may lead to nearly complete defluorination within approximately 2 hours of reaction.

The invention provides a hydrotalcite-derived copper-based nano-catalyst as well as a preparation method and application thereof. The hydrotalcite-derived copper-based nano-catalyst provided by the invention can effectively improve the yield of methanol in a CO and / or CO2 hydrogenation reaction process and keep excellent activity and selectivity of the catalyst. According to the present invention, the characteristic that the active metal component prepared after the structure topology transformation is highly dispersed and still maintains the intercalation structure is utilized by using the characteristic that the metal element composition ratio of the hydrotalcite is adjustable and the parameters of the structure topology transformation process are controllable, such that the microstructure regulation of Cu in the Cu-based nano-catalyst is achieved. The Cu-based nano-catalyst prepared by the method is good in Cu dispersity, the geometric structure and electronic characteristics of a metal-carrier interface can be regulated and controlled, and when the Cu-based nano-catalyst is used for CO / CO2 hydrogenation reaction, the Cu-based nano-catalyst shows excellent catalytic reaction performance and can be popularized and applied to various heterogeneous catalytic reaction fields such as hydrogenation and dehydrogenation.

The invention discloses a polyacid-based metal viologen framework crystalline material as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials. The crystalline material is synthesized in one step through a hydrothermal method, the molecular formula is Cu2 (H2O) 2 (L) 2 [PW12O40] [OH]. 2H2O, the crystalline material belongs to a monoclinic system, the space group is P21, the cell parameters are alpha = 90 degrees, beta = 114.208 (2) degrees and gamma = 90 degrees, and the structure of the crystalline material is determined through X-ray diffraction. According to the material, accurate compounding of polyacid clusters and metal viologen on the molecular level is achieved, an effective electron transmission channel is constructed, separation of photon-generated carriers is remarkably promoted, and excellent photocatalytic activity is shown. At the ambient temperature, the crystalline material can be used as a catalyst to efficiently degrade dye pollutants (such as methylene blue and rhodamine B) in a water body, the degradation rate within 60 minutes exceeds 90%, and the crystalline material has good cycle stability and structural durability.

The invention discloses a preparation method of a pyrenyl covalent organic framework material and application of the pyrenyl covalent organic framework material in photocatalytic hydrogen production reaction, and belongs to the field of heterogeneous catalysis. The novel pyrenyl COFs photocatalyst is synthesized by regulating and controlling the quantity of triphenylamine and integrating triphenylamine monomers with different contents into a pyrenyl covalent organic framework (COF) skeleton. The preparation method is simple to operate, mild in reaction condition, short in reaction time and high in repeatability, the obtained pyrenyl COFs have good light capture capacity and photon-generated carrier separation characteristic, electron-hole recombination can be effectively reduced, the excited state service life is prolonged, the reaction efficiency of photocatalytic hydrogen production is improved, and potential application prospects are achieved.

The invention belongs to the field of chemical reaction equipment, and discloses a triple enhanced flow field structure for enhancing a micro-flow field reaction process, which comprises a channel shell and a flow field structure arranged in a channel, the channel shell comprises a mixing channel, an outlet and at least two inlet channels, all the channels are circular through holes, and the flow field structure is arranged in the mixing channel. The flow field structure is formed by sequentially and alternately arranging and combining first flow field structures and second flow field structures, at least two reaction fluids enter the mixing channel through the inlet channel to be mixed, and the mixed fluid flows out through the outlet. The invention provides a safe, efficient and easy-to-amplify micro-flow field chemical reactor, and provides a universal solution for industrial processes such as nano-emulsion preparation, heterogeneous catalytic reaction, drug-loaded microsphere preparation and the like.

The invention relates to the technical field of heterogeneous catalysis, and discloses a catalyst for preparing methanol through carbon dioxide hydrogenation as well as a preparation method and application thereof. The catalyst contains a copper-zinc bimetallic oxide, and the surface of the copper-zinc bimetallic oxide is modified with a nitrogen-doped carbon material. On the basis of the total weight of the catalyst, the content of the nitrogen-doped carbon material is 0.498 to 3.226 wt%. The catalyst for preparing the methanol through the hydrogenation of the carbon dioxide contains the copper-zinc bimetallic oxide, and the copper-zinc bimetallic oxide is modified by adopting the nitrogen-doped carbon material, so that the catalytic activity and the methanol selectivity of the catalyst for preparing the methanol through the hydrogenation of the carbon dioxide can be remarkably improved.

The invention discloses a preparation method of a hydroxyl-functionalized quaternary phosphonium salt polyion liquid super-crosslinked heterogeneous catalyst and an application of the catalyst in catalysis of a cycloaddition reaction of CO2 and epoxide. Trimethoxytriphenylphosphine and dibromo-p-xylene are firstly subjected to quaternary phosphating to form triphenylphosphine-based ionic liquid, and then the triphenylphosphine-based ionic liquid and biphenyl benzyl dichloride can be subjected to aromatic electrophilic substitution reaction in the presence of 1, 2-dichloroethane serving as a solvent and anhydrous aluminum chloride serving as a Lewis acid catalyst to realize cross-linking, so that the triphenylphosphine-based ionic liquid can be prepared. And methoxy can be removed to form hydroxyl, so that the hydroxyl-functionalized quaternary phosphonium salt polyion liquid super-crosslinked polymer is prepared in one step. The resulting heterogeneous catalyst effectively converts CO2 to cyclic carbonates under milder conditions (80 DEG C, 1 atm) in the absence of a soluble co-catalyst.

A process reacts olefins having 4 to 20 carbon atoms and the feed stream used, containing at least linear olefins and branched olefins, is distilled between two reaction steps and only the high-boiler phase obtained in this distillation is subjected to the second reaction, a heterogeneously catalysed hydroformylation, a homogeneously catalysed hydroformylation or a homogeneously catalysed alkoxycarbonylation.

The invention discloses a supported porous organic polymer catalyst and application thereof in preparation of 2, 5-furandicarboxylic acid from 5-hydroxymethylfurfural, the supported porous organic polymer catalyst comprises a carrier and an active component supported on the carrier; the carrier is an aniline polymer; and the active component is a gold-palladium alloy. An amino-modified porous organic polymer loaded with a gold-palladium alloy is used as a catalyst to efficiently catalyze and oxidize 5-hydroxymethylfurfural to prepare 2, 5-furandicarboxylic acid. Compared with the method that strong oxidants such as KMnO4 and the like need to be used for metering and oxidizing HMF to obtain FDCA, the method adopts oxygen as the oxidant, so that the method is more environment-friendly and efficient; compared with the traditional heterogeneous catalysis which needs to add an alkali promoter, the method can realize catalytic oxidation under an alkali-free condition, and has the advantages of high reaction selectivity and long service life of the catalyst while ensuring high conversion rate.

The present application relates to a kind of self-regeneration fixed bed reaction system for multiphase catalytic reaction, belong to fixed bed technical field.The system includes shell assembly, reaction tank assembly, distribution disc assembly and regeneration connecting assembly.Shell is separated to form several sectors, each sector is equipped with reaction tank, and isolation chamber is formed between reaction tank.Regeneration connecting assembly includes upper and lower rotating disc connected by rotating shaft, and inert gas containing cavity is arranged in rotating disc and is communicated with isolation chamber.Driving mechanism rotates rotating disc, so that regeneration pipe is communicated with specific reaction tank and carries out on-line carbon burning regeneration.The present application realizes the continuous production mode of "multi-zone reaction, one area on-line regeneration" by rotating structure, cooperates with the unique scraping seal assembly and elastic buffer structure, solves the pain points such as fast coking of catalyst in high-temperature dehydrogenation and other reactions, frequent switching, easy to string gas and thermal stress damage, significantly improves the production efficiency, operating stability and heat energy utilization rate of device.

The present invention relates to the technical field of multiphase catalysts, and specifically relates to a carbon-based Cu-Ni dual-atom cluster catalyst, a preparation method thereof, and an application thereof. The preparation method includes the following steps: mixing an aqueous solution of thiosemicarbazide, magnesium chloride hexahydrate, an alkali, a nickel salt, a copper salt, and a saccharide compound, and performing freeze-drying to obtain a precursor; sequentially performing preheating treatment, first pyrolysis, and second pyrolysis on the precursor to obtain a carbon-based Cu-Ni dual-atom catalyst; formulating the carbon-based Cu-Ni dual-atom catalyst into a slurry, adhering it to a current collector, and performing in-situ electrolysis treatment to obtain a carbon-based Cu-Ni dual-atom cluster catalyst. The preparation method of the present invention can not only precisely control the number of metal atoms in the metal atom cluster, but also realize the reconstruction of Cu-Ni dual-atom sites, overcoming the problems that it is difficult to control the size of metal particles and it is difficult to exert the advantages of atomic-level catalysts in the traditional high-temperature carbonization method.

The invention discloses a cerium oxide carrier loaded ruthenium-gadolinium bimetallic heterogeneous catalyst and a preparation method and application thereof, the heterogeneous catalyst takes a cerium oxide nanorod as a carrier, and metal ruthenium and metal gadolinium are loaded on the carrier; wherein the loading capacity of the metal ruthenium and the loading capacity of the metal gadolinium are independently larger than 0 and smaller than or equal to 10 wt%. The cerium oxide loaded ruthenium-gadolinium bimetallic catalyst provided by the invention can improve the catalytic activity and selectivity of ester prepared by an olefin esterification one-step method, ester compounds can be synthesized at a relatively high yield, and the ester selectivity of 99% or more is obtained. Besides, the cerium-loaded ruthenium-gadolinium heterogeneous catalyst prepared by the method is easy to separate from reactants and products and can be repeatedly used, and a new technology suitable for industrialization is provided for ester preparation through esterification of olefin compounds under efficient and selective mild conditions.

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 present invention discloses an in-situ test device and a test method for catalyst reactions, which can be used for in-situ synchrotron radiation testing during the process of heterogeneous catalyst reactions and obtain high-quality X-ray absorption and X-ray diffraction spectra during the catalytic reaction process, providing basic data for further developing efficient heterogeneous catalysts. The structure of the present invention is simple, and the flow state of the reaction gas can be controlled by controlling the size of the catalyst powder sample particles, the inner diameter of the sample tube, and the flow rate of the high-pressure gas. It can be used to monitor the in-situ catalyst structure evolution law during the fixed-bed catalytic reaction process, solving the problems that the previous equipment could not reflect the true in-situ spectroscopic information of heterogeneous catalytic reactions, had poor signals, and could not simultaneously achieve multiple spectroscopic monitoring, and has important value and significance for promoting the development of heterogeneous catalysts.

The invention discloses a COF-based heterogeneous iodobenzene catalyst and its preparation method and application, belonging to the field of catalyst preparation technology. The COF-based heterogeneous iodobenzene catalyst is obtained by polymerizing a hydrazide monomer containing an iodophenyl group unit and 1,3,5-tris(4-formylphenyl)triazine; the structural formula of the hydrazide monomer containing an iodophenyl group unit is: The COF-based heterogeneous iodobenzene catalyst can be used as a catalyst for the chlorination reaction of anisole, catalyzing the chlorination reaction of anisole, achieving heterogeneous catalysis, and using a small amount, easy to recover, improving the utilization rate of the catalyst, and reducing the cost of anisole chlorination.