175 results about "Heterogeneous catalysis" patented technology

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 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 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 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.

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 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 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 invention belongs to the technical field of high polymer material synthesis and heterogeneous catalysis, and particularly discloses an amino mesoporous silica supported copper catalyst as well as a preparation method and application thereof. The catalyst is prepared by a direct co-condensation method which comprises the following steps: in the presence of a structure-directing agent, copolymerizing a silicon source and amino silane to form a mesoporous silica carrier which has a regular mesoporous structure and is modified by amino in a skeleton; then loading cuprous through a solid-state ion exchange method in an inert atmosphere, and stably endowing highly dispersed cuprous (Cu < + >) with an active center through low-temperature heat treatment; the catalyst can be used for efficiently catalyzing oxidative coupling of phenol, and is particularly suitable for synthesizing polyphenyl ether with controllable number-average molecular weight and terminal functionality, the synthesized product is high in purity and narrow in molecular weight distribution, and the catalyst is particularly suitable for high-performance copper-clad plates, semiconductor packaging and other electronic chemicals.

The application discloses a kind of high-efficiency heterogeneous catalyst for CO2 ring addition preparation cyclic carbonate and its preparation method and application, belong to catalyst technical field.The high-efficiency heterogeneous catalyst is transition metal doped polyoxometalate coordination polymer, chemical general formula is C 16 H 58 M2N2Na2O 48 V 10 Wherein, M is selected from Co 2+ , Ni 2+ , Cu 2+ Or Zn 2+ Its preparation method is: sodium vanadate, transition metal acetate and bis (2-hydroxyethyl) amino (trihydroxymethyl) methane ligand are dissolved in water with pH being 1~3, stirring reaction, after filtration, crystallization is stationary, and is obtained.In the ring addition reaction of CO2 and epoxide, the catalyst and cocatalyst tetrabutylammonium bromide synergistic effect, catalytic yield can be up to 98.2%, selectivity is more than 99%, and catalytic activity still remains at 88% after recycling five times.

The application provides a Yangmei-type phenolic resin microsphere, a carbon sphere and a preparation method and application thereof, and belongs to the technical field of carbon materials. The Yangmei-type phenolic resin microsphere is obtained by using cheap and easily available phenol and formaldehyde as raw materials, through a step-by-step process of "prepolymerization to form an oligomer under alkaline conditions" and "in-situ solidification and growth of surface nano-protrusions under acidic conditions". The phenolic resin microsphere has a unique core-protrusion integrated three-dimensional structure, and after carbonization, the Yangmei-type carbon sphere can be directly converted, the core-protrusion composite structure is completely retained, and there is no collapse, cracking or protrusion shedding phenomenon. The preparation process of the application does not need a template agent, has low equipment requirements, is simple and easy to operate and enlarge, and has low raw material cost. The prepared Yangmei-type phenolic resin microsphere and carbon sphere have high specific surface area and excellent structural stability, and have wide application prospects in the fields of battery negative materials, supercapacitor electrodes, heterogeneous catalytic carriers and the like.

The invention discloses a method for preparing primary amine chemicals by hydrogenation amination of aldehyde and ketone through a platinum group monatomic doped nickel-based layered hydroxide catalyst, and belongs to the technical field of heterogeneous catalysis preparation of high-quality chemicals. The method comprises the following steps: by taking aldehyde and ketone chemicals as raw materials and ammonia gas as a gas source, carrying out hydrogenation amination reaction in a reaction solvent under the action of a platinum group monatomic doped nickel-based layered hydroxide catalyst and a hydrogen atmosphere to prepare a primary amine chemical; the platinum group single atom is any one of palladium, platinum, ruthenium, iridium or rhodium; wherein the effective active components on the nickel-based layered hydroxide carrier are composed of nickel metal and other metals, and the other metals are one or more of zinc, magnesium, aluminum, cerium, manganese, zirconium, iron, niobium or copper. The primary amine chemical prepared by the method has very high economic value.

The application discloses a bisoxazoline pyridine functionalized porous organic polymer and preparation and application thereof; firstly, a styryl functionalized PyBox monomer (VPyBox) is designed and synthesized, and VPyBox, styrene and divinylbenzene are subjected to free radical polymerization under initiation of azobisisobutyronitrile in a certain proportion to obtain a series of porous organic polymers (POP-PyBox); the POP-PyBox can be used as a solid N , N , N tridentate ligand for Co-catalyzed hydrosilylation of arylalkynes with diphenylsilane; the heterogeneous catalyst system developed by the application has a catalytic activity comparable to that of a homogeneous catalyst reported in the literature, and the catalyst is easy to separate and recover; the recovered catalyst can be recycled for more than 6 times, which can not only greatly reduce the preparation cost of vinylsilane, but also simplify the post-treatment process and reduce the three wastes, and has a good practical application prospect.

The invention discloses a method for treating aquaculture wastewater based on a persulfate advanced oxidation technology, which comprises the following steps: (1) putting prepared secondary modified zeolite into a polycarboxylate superplasticizer, stirring, then adding a solution containing Fe < 2 + > and / or Fe < 3 + >, carrying out ultrasonic treatment, then separating out a solid product, and calcining in a protective atmosphere to obtain a modified zeolite precursor; and then cooling to room temperature to obtain the three-stage modified zeolite. And (2) adding the mixture into alkali liquor for heating treatment, then mixing the obtained solid product with a calcium nitrate solution for hydrothermal reaction, and then washing and drying the obtained solid product to obtain the heterogeneous catalyst. And (3) adding persulfate and a heterogeneous catalyst into the breeding wastewater for wastewater treatment. Heterogeneous catalysis is adopted to promote persulfate to release free radicals, so that the problem of waste caused by difficulty in recycling a catalyst is solved, and the problem of secondary pollution of wastewater caused by the catalyst is favorably avoided.

The invention discloses a reaction kettle for catalytic synthesis reaction and a use method of the reaction kettle. The reaction kettle comprises a kettle body (4); the stirring mechanism comprises a driving device (2) and a stirring paddle (5) arranged in the kettle body (4); and the intrusive pressure-bearing gas guide structure comprises a gas guide tube section (3) extending into the kettle body (4). The tail end of the gas-guide tube section (3) is positioned in a mixing area acted by blades of the stirring paddle (5), and a plurality of gas-guide holes (9) are formed in the tube wall of the gas-guide tube section (3). The structure is used for directly introducing a pressurized gas-phase raw material into a liquid reaction system in the kettle, so that a traditional gas-liquid two-dimensional interface is broken under the stirring action, and three-dimensional dispersion and efficient mass transfer of the gas-phase raw material in a liquid phase are realized. According to the invention, the interface contact and mass transfer efficiency in the gas-liquid-solid heterogeneous catalytic reaction is obviously improved, and the method is especially suitable for a distributed catalytic synthesis process requiring a high catalyst utilization rate.

The present application belongs to the field of heterogeneous catalysis and material synthesis, and relates to a hollow ceramic fibrous iron-based catalyst for preparing biofuel from synthesis gas, a preparation method and application thereof. The catalyst is prepared by a coaxial electrospinning process, with polyborosilazane as a shell layer, polymethyl methacrylate, polyvinylpyrrolidone and acetylacetone iron as a core layer, and through spinning, solidification, gradient temperature pyrolysis and reduction steps, a hollow ceramic fibrous iron-based catalyst is prepared. The shell layer of the catalyst is converted into a high-strength and high-temperature stable SiBCN ceramic carrier, the core layer is pyrolyzed to form a hollow cavity and in-situ load high-dispersion iron active species, and the catalyst has good mechanical strength, high hydrothermal stability and excellent catalytic activity. The application of the catalyst in a continuous flow fixed bed reactor for preparing biofuel from synthesis gas is suitable for the synthesis of sustainable aviation fuel and other biofuels.

The invention discloses a method for preparing 6-fluoronicotinic acid based on a heterogeneous catalytic system, which comprises the following steps: sequentially adding 2-fluoro-5-methylpyridine and a heterogeneous catalyst into a reaction kettle, and uniformly stirring and mixing; continuously introducing oxygen into the reaction kettle, heating to carry out oxidation reaction, monitoring the reaction by HPLC (High Performance Liquid Chromatography) and TCL until the conversion rate of 2-fluoro-5-methylpyridine in a reaction system is greater than or equal to 95%, then cooling to room temperature, filtering reaction liquid, washing a filter cake, drying and recovering the catalyst; after deionized water is added into the filtrate for dilution, a hydrochloric acid solution is added into the reaction system to adjust the pH value, then standing and precipitating are conducted, finally filtering is conducted, and a filter cake is dried to obtain 6-fluoronicotinic acid; the heterogeneous catalyst is a Zr-MOF (Metal Organic Framework) material loaded with TEMPO (Tetramethylpiperidine Oxide)-Cu. According to the method, 2-fluoro-5-methylpyridine is used as a raw material and a reaction medium at the same time, oxygen is used as an oxidizing agent, the 6-fluoronicotinic acid is efficiently synthesized under the catalysis of the heterogeneous catalyst, and the method is low in cost, high in product purity and yield and environmentally friendly.

The invention is directed to a process for producing a sulfur trioxide-containing gas stream. A sulfur dioxide and oxygen containing gas are introduced in at least one converter stage to produce a sulfur trioxide-containing gas stream in a heterogeneous catalysation. In doing so a partial stream of a sulfur trioxide containing gas stream produced in the first or a subsequent converter stage is branched off as a recycling stream and recycled to be part of a feed gas of the first converter stage. It is essential that he sulfur dioxide containing gas and added oxygen are introduced as a motive medium in an ejector via an motive medium inlet such that it sucks in and accelerates the recycling stream through a sucking medium inlet as a sucking medium to produce a feed gas streaming through a discharge outlet for the converter stage at a set pressure range.

Continuous process for pretreating a batch of oil containing a maximum of 20 wt% free fatty acids by countercurrent esterification of the free fatty acids, in which a vertical liquid / liquid contact apparatus containing a solid-form esterification catalyst, supplied by an alcohol batch containing at least 40 wt% alcohol and up to 50 wt% water, as well as impurities whose content is a maximum of 1 wt% of the alcohol batch, and heteroelements with a content of less than 500 ppm, wherein the alcohol is methanol or ethanol, and the oil batch contains, the contact device is operated at a temperature between 25 and 120 °C and a pressure between 1 and 20 bar, wherein the contact apparatus performs the contact in liquid / liquid countercurrent between a heavy phase and a light phase, wherein the heavy phase is either an oil-rich phase or an alcohol-rich phase.

This invention provides a method for synthesizing dimethyl 2,5-furandicarboxylate by oxidative esterification of 2,5-furandiethanol using a cobalt-zinc-based carbon material, belonging to the field of catalytic synthesis technology. This method uses 2,5-furandiethanol as a raw material, molecular oxygen as an oxidant, and a cobalt-zinc-based carbon material as a heterogeneous catalyst to prepare dimethyl 2,5-furandicarboxylate via a one-step oxidative esterification reaction in methanol solvent using high-performance liquid phase. The cobalt-zinc-based material is prepared by mixing a certain amount of cobalt salt, zinc salt, and organic nitrogen-containing compound ligand to obtain a precursor, which is then calcined at 500-1100℃ under an inert atmosphere for 0.5-24 h. The oxidative esterification method provided by this invention is mild and efficient, and the catalyst is inexpensive and readily available, making this method highly practical and applicable.

This invention discloses a method and application for preparing metal-doped composite catalysts based on ZIF-67, relating to the field of wastewater treatment technology. This invention constructs a multi-component synergistic system through the coordination of functional groups on the surface of biochar with ZIF-67 and the electronic coupling effect between rare earth metals and Co. Compared with traditional pure chemical support synthesis methods, this reduces costs and improves environmental compatibility. The metal-doped composite catalyst prepared by this invention is a novel heterogeneous catalyst. Through the electrostatic interaction between the biochar support and Co ions, and the metal-metal bonds formed between La / Ce and Co, it significantly enhances the stability of Co ions, effectively avoiding secondary pollution. The metal-doped composite catalyst prepared by this invention can efficiently activate persulfate to generate reactive oxygen species and synergistically remove multiple pollutants from complex water bodies containing sulfamethoxazole, tetracycline, levofloxacin, and other antibiotics such as methylene blue.

The invention discloses a preparation method and application of an acid-base bifunctional magnesium-aluminum bimetallic oxide catalyst, and relates to the technical field of biomass catalytic conversion and heterogeneous catalytic materials.The preparation method comprises the steps that firstly, magnesium nitrate hexahydrate and aluminum nitrate nonahydrate are dissolved into a metal salt mixed solution; dropwise adding a sodium hydroxide aqueous solution into the metal salt mixed solution to obtain a turbid solution; heating and crystallizing in a water bath, transferring into a reaction kettle, and putting into a drying oven for hydrothermal crystallization. The method comprises the following steps: synthesizing a hydrotalcite-like precursor through a coprecipitation-hydrothermal coupling method, and carrying out high-temperature roasting to obtain the acid-base bifunctional composite metal oxide. The acid-base bifunctional composite metal oxide has the beneficial effects that the acid-base bifunctional composite metal oxide has a layered structure and a high specific surface area and is suitable for a biomass pyrolysis-catalytic reforming process, an alkaline site of the acid-base bifunctional composite metal oxide promotes a deoxidation reaction, an acidic site of the acid-base bifunctional composite metal oxide promotes an aromatization reaction, and the acid-base bifunctional composite metal oxide can effectively regulate and control the composition of biomass pyrolysis volatile components; the content of oxygen-containing compounds is obviously reduced, and the selectivity of monocyclic aromatic hydrocarbon is improved.

The invention discloses a multi-component synergistically modified three-dimensional electro-catalytic material and a preparation method thereof, and relates to the technical field of environmental catalytic materials.The material is prepared by taking columnar activated carbon as a carrier and synergistically loading cobalt-manganese-nickel-iron-copper-molybdenum-lanthanum-niobium multi-principal-element metal salt, acidic silica sol, phytic acid, a KH550 silane coupling agent and single-layer graphene oxide; all the components are compounded according to a specific mass ratio and are subjected to modification, impregnation and high-temperature curing. The preparation method comprises the steps of KH550 modified activated carbon preparation, multi-component composite steeping liquor preparation, co-adsorption / coating, air atmosphere high-temperature heat treatment and the like. According to the material, a three-dimensional structure of an activated carbon framework, a high-entropy active center and a Si-C-GO network is constructed, the material is applied to an MFEC heterogeneous catalytic electrolysis process to serve as a catalytic filler, and the technical problems that a traditional electro-catalytic material is narrow in pH adaptation range, poor in stability and low in mass transfer efficiency, and the treatment effect of refractory industrial wastewater is poor are solved. Good industrial application prospects are realized.

This invention proposes a heterogeneous catalyst and its application in the decarbonylation of alkyl oxalate to alkyl carbonate. The heterogeneous catalyst is a transition metal-modified organic amine-grafted polystyrene resin obtained by grafting chloromethylated polystyrene resin with an organic tertiary amine, followed by modification with a transition metal anion complex. This invention utilizes the heterogeneous catalyst to fully utilize dimethyl oxalate, an important intermediate in the coal-to-ethylene glycol process. By decarbonylating dimethyl oxalate, it can be efficiently converted to dimethyl carbonate and its derived alkyl esters under mild conditions.

The application belongs to the field of heterogeneous catalysis and material synthesis, and discloses a lotus-shaped ceramic fiber iron-ruthenium-based catalyst for synthesizing biofuel as well as a preparation method and application thereof. The catalyst is prepared by using a coaxial electrospinning process, taking polysilazane, an iron source and a spinning aid as a shell spinning solution, and taking a mixture containing polysilazane, an iron source, a ruthenium source, a pore-forming agent and a spinning aid as a core spinning solution, to obtain a lotus-shaped ceramic fiber precursor containing iron-ruthenium. After the precursor is subjected to stepwise heating and solidification, inert atmosphere pyrolysis and hydrogen reduction, the lotus-shaped ceramic fiber iron-ruthenium-based catalyst is formed. The catalyst has excellent mechanical strength, high hydrothermal stability and good reaction mass transfer performance, and is suitable for preparing biofuel from syngas in a fixed bed reactor.

A method of manufacturing a clay-supported catalyst is provided. The method includes adding halloysite nanotubular (HNT) in water to form an HNT-water mixture, adding Ni precursor salt in water to form a Ni salt solution, adding the Ni salt solution to the HNT-water mixture to form a Ni-HNT mixture, and heating the Ni-HNT mixture at a predetermined temperature for a predetermined time to form a Ni-HINT catalyst. The HNT serves as a catalyst support.

The invention belongs to the technical field of heterogeneous catalysis, and particularly relates to a cyanidation heterogeneous catalyst as well as a preparation method and application thereof. Natural polysaccharide guar gum is used as a matrix, and is modified by Schiff base and loaded with Pd to obtain a functional guar gum loaded Pd complex catalyst with multiple coordination sites of hydroxyl, nitrogen / oxygen heterocyclic group and imino. Through the synergistic chelation of the multiple sites, the catalyst shows excellent universality, catalytic activity and stability in the cyanidation reaction. Depending on multi-site complexing palladium, after the catalyst is recycled for multiple times, the metal falling amount is lower than 1%, and the defect that metal of a traditional heterogeneous catalysis system is prone to loss is effectively overcome. In the preparation process of the catalyst, the environment-friendly guar gum is used as an initial raw material, and the obtained catalyst has the characteristics of high activity, easiness in separation, low cost, small metal shedding amount and the like in cyanidation reaction application, conforms to the green chemical direction, and has wide industrial application prospects.

The application discloses a preparation method and application of a cellulose-based material loaded cobalt-doped metal organic framework compound catalyst. The composite catalyst takes a cellulose-based material as a carrier, and is subjected to hydrothermal treatment together with an aqueous solution of ferric chloride hexahydrate and fumaric acid, so as to obtain a metal organic framework compound MIL-88A which is in-situ grown on the cellulose-based material, and then the MIL-88A is subjected to freeze drying. After the treatment, the obtained cellulose-based material loaded MIL-88A is added into a mixed aqueous solution of cobalt nitrate nonahydrate and urea, and is subjected to water bath treatment at 90 DEG C, and then the cellulose-based material loaded MIL-88A obtained after the treatment is subjected to freeze drying, so as to obtain the cellulose-based material loaded cobalt-doped MIL-88A catalyst. The prepared heterogeneous catalyst can efficiently degrade dyes by activating potassium monopersulfate. The catalyst is easy to recover, and can be used in an intermittent or continuous dye degradation process. In the continuous degradation of a dye rhodamine B, when the flow rate is 6 ml / h, the catalyst can still maintain high catalytic degradation activity for 72 h.