184 results about "Ruthenium catalyst" patented technology

The invention discloses a preparation method of chloroprocaine hydrochloride, and belongs to the technical field of chloroprocaine hydrochloride synthesis. Comprising the following steps: (1) preparing 4-amino-2-chlorobenzoic acid: dissolving 2-chloro-4-nitrobenzoic acid in a solvent, and uniformly stirring; adding a ruthenium catalyst Ru / SNC into the system, and carrying out heat preservation reaction in a hydrogen atmosphere; the 4-amino-2-chlorobenzoic acid is obtained through a reaction; (2) preparation of chloroprocaine hydrochloride: dissolving 4-amino-2-chlorobenzoic acid, 2-chloroethyl diethylamine and a solid base catalyst K / r-GO in a reaction solvent, and carrying out an esterification reaction; the 2-(diethylamino)-2-chlorine-4-nitrobenzoic acid ethyl ester is obtained; and then salifying and drying to obtain the chloroprocaine hydrochloride. The catalyst provided by the invention realizes efficient catalytic reaction at lower temperature and pressure, can be recycled for dozens of times, and is suitable for large-scale industrial production.

The invention belongs to a preparation method of a chemical intermediate, and particularly relates to a preparation method of dimethyl 1, 4-cyclohexanedicarboxylate, which comprises the following steps: carrying out hydrogenation reaction on dimethyl p-toluene in a solvent in a hydrogen atmosphere under the catalysis of a cerium dioxide loaded ruthenium monometal catalyst to obtain the dimethyl 1, 4-cyclohexanedicarboxylate, the invention discloses a method for preparing dimethyl 1, 4-cyclohexanedicarboxylate from dimethyl terephthalate through hydrogenation, which comprises the following steps: under the catalysis of a ruthenium-containing catalyst taking cerium dioxide as a carrier, carrying out hydrogenation reaction on dimethyl terephthalate in a solvent in a hydrogen atmosphere to obtain dimethyl 1, 4-cyclohexanedicarboxylate, and separating the dimethyl 1, 4-cyclohexanedicarboxylate from dimethyl terephthalate to obtain dimethyl 1, 4-cyclohexanedicarboxylate. And after the reaction is completed, the high-purity dimethyl 1, 4-cyclohexanedicarboxylate can be obtained only by filtering out the catalyst and concentrating to remove the solvent, and the operation is simple and convenient.

The invention discloses a supported ruthenium-based ammonia synthesis catalyst prepared from organic matter modified activated carbon, which is prepared by taking the organic matter modified activated carbon as a carrier, and dipping the organic matter modified activated carbon into a ruthenium salt solution and a barium salt solution in sequence. Compared with an activated carbon supported ruthenium catalyst prepared by a traditional impregnation method, the obtained catalyst has the advantages that the ammonia synthesis activity of the catalyst with low ruthenium loading capacity is improved, and the catalyst has a relatively good application prospect.

The invention discloses a packaging material as well as a preparation method and application thereof. The packaging material comprises the following components in parts by mass: 40-85 parts of matrix resin, 5-30 parts of phase change PCM particles, 3-20 parts of self-repairing microcapsules, 1-8 parts of an interface compatilizer and 10-20 parts of a heat-conducting network reinforcing material, the melting point of the phase change PCM particles is not more than 80 DEG C; a core layer of the self-repairing microcapsule comprises dicyclopentadiene and a ruthenium catalyst, and a shell layer of the self-repairing microcapsule comprises polyurea or polyurethane; the PCBA packaging material with the intelligent response function is formed by combining the low-melting-point phase-change PCM particles with the self-repairing microcapsule system, when the PCBA temperature is too high, the low-melting-point phase-change PCM particles are molten, junction temperature suddenly rising is restrained through melting heat absorption, meanwhile, the adjacent microcapsules are triggered to be broken through volume expansion, DCPD monomers are released and subjected to in-situ polymerization under the action of a catalyst, and the PCBA packaging material with the intelligent response function is obtained. Microcracks generated by thermal stress are rapidly repaired, and the heat dissipation stability and the electrical insulation reliability of the material in long-term thermal circulation are remarkably improved.

The invention discloses a rod-like rare earth metal oxide ruthenium-loaded catalyst for efficient ammonolysis hydrogen production and a preparation method thereof, and belongs to the field of ammonolysis hydrogen production. The catalyst takes a nanorod-shaped rare earth metal oxide as a carrier, loads a small amount of noble metal ruthenium as an active component, and is applied to hydrogen production through ammonia decomposition. The catalyst disclosed by the invention can efficiently decompose ammonia gas at the reaction temperature of 450 DEG C, and has a relatively high H2 generation rate (50mol. GRu <-1 >. H <-1 >).

The invention provides a ruthenium-containing catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. According to the invention, 3, 3 '-dibromo-4, 4'-biphenol, 1, 3, 5-tri (p-vinylphenyl) benzene and ruthenium salt are used as main raw materials to carry out polymerization reaction so as to prepare a ruthenium-containing catalyst in which nano-scale pore channels are formed; the obtained ruthenium-containing catalyst is good in catalytic performance, thermal stability and chemical stability; the ruthenium-containing catalyst is used for catalyzing hydrogenation of diisononyl phthalate to prepare the cyclohexane-1, 2-diisononyl phthalate, the catalytic effect of the ruthenium-containing catalyst is good, and the yield of the cyclohexane-1, 2-diisononyl phthalate is high.

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 relates to the technical field of ruthenium catalysts, and provides a preparation method of a first-generation Grubbs catalyst. The preparation method comprises the following steps: mixing dichloro bis (2, 2 '-dipyridyl) ruthenium, tricyclohexylphosphine, benzyl dichloride and an alcohol solvent, and carrying out a coordination reaction to obtain a first-generation Grubbs catalyst; the temperature of the coordination reaction is 0-25 DEG C. Dichloro bis (2, 2 '-dipyridyl) ruthenium, tricyclohexylphosphine and benzyl dichloride are adopted as reaction raw materials, alcohol is adopted as a solvent, the reaction is performed through a one-pot method, the reaction condition is mild, operation is easy, environmental pollution is small, cost is low, the requirement for equipment is low, the dosage of reactants can reach the kilogram level, and batch industrial production can be achieved.

The invention relates to a mesoporous cerium oxide supported ruthenium catalyst and a preparation method and application thereof.The preparation method includes the steps that tri (2-aminoethyl) amine and aromatic aldehyde are subjected to an aldehyde-amine condensation polymerization reaction to form imine bonds, a porous organic cage-shaped polymer is obtained, the organic cage-shaped polymer serves as a template, cerium oxide crystals are synthesized through a hydrothermal reaction, and the mesoporous cerium oxide supported ruthenium catalyst is obtained. Roasting to remove the organic cage polymer to obtain a mesoporous cerium oxide carrier; ruthenium single atoms are dispersed and loaded in channels of the mesoporous cerium oxide carrier through a supercritical fluid deposition method, then reduction is carried out, and the mesoporous cerium oxide-loaded ruthenium catalyst which is low in ruthenium loading capacity, uniform in metal active center distribution, small in particle size and high in dispersity is obtained, can be used repeatedly without inactivation and is used for bisphenol A hydrogenation reaction, and the catalytic activity of the catalyst is improved. The conversion rate of bisphenol A and the selectivity of hydrogenated bisphenol A can be effectively improved.

The present invention belongs to the field of chemical engineering, and particularly relates to a method for activating methane to produce methanol using a ruthenium-containing catalyst. The present invention discloses a preparation method of a ruthenium-loaded catalyst, which includes the following steps: pretreating activated carbon to obtain pretreated activated carbon as a carrier; loading noble metal ruthenium onto the carrier to obtain a ruthenium-loaded catalyst. The present invention also provides a method for photocatalytically preparing methanol / methanol derivatives from methane: including the following steps: putting the ruthenium-loaded catalyst into an autoclave, then adding a reaction solvent and an oxidant, first displacing the air in the autoclave with methane, and then continuing to introduce methane until the pressure reaches 0.5-2 MPa, and then sealing the autoclave, providing a light source by a short-arc xenon lamp, and reacting at room temperature to obtain methanol / methanol derivatives. The method for preparing methanol by the present invention has the characteristics of relatively simple process, mild conditions, and high yield.

This invention discloses a ruthenium catalyst supported on a phosphine-containing porous organic polymer and its preparation method. The phosphine-containing porous organic polymer serves as both a support and a solid ligand. The phosphine-containing porous organic polymer ligand is a random copolymer, and its structure can be represented by general formula I. The ruthenium catalyst supported on the phosphine-containing porous organic polymer according to this invention has a large specific surface area and contains a hierarchical porous structure, enabling efficient direct preparation of alcohols from olefins via reductive hydroformylation, and is easily recyclable. It exhibits excellent activity and regioselectivity in the direct preparation of alcohols from olefins via reductive hydroformylation, with an alcohol selectivity of nearly 90% and a high ratio of straight-chain alcohols to branched-chain alcohols.

The present invention relates to a method of preparing an organosulfur compound, and more particularly, to a method of preparing an organosulfur compound including a step of synthesizing an organosulfur compound by reacting specific compounds with a metal hypohalite under a ruthenium catalyst in a mixed solvent containing water and an organic solvent, wherein the metal hypohalite is introduced in a solid state and a portion thereof reacts in an undissolved state. According to the present invention, the present invention has an effect of providing an organosulfur compound preparation method capable of preparing an organosulfur compound in high yield due to excellent reaction stability, short reaction time, and reduced side reactions.

The invention discloses a toluene hydrogenation catalyst used at room temperature and normal pressure as well as a preparation method and application thereof, oxidation modified carbon nanofibers are adopted as a carrier, and face-centered cubic Ru is loaded on the oxidation modified carbon nanofibers in the form of nanoparticles through solvothermal reaction to obtain the toluene hydrogenation catalyst. The catalyst provided by the invention can efficiently catalyze toluene hydrogenation to generate methylcyclohexane under the conditions of room temperature and normal hydrogen pressure. Compared with a traditional catalyst, the carbon oxide nanofiber supported ruthenium catalyst not only can work under relatively mild conditions, but also can keep relatively high activity in long-time use, and provides a key support for low cost of an organic liquid hydrogen storage technology.

The invention provides a copper-ruthenium catalyst for photo-thermal catalysis of plastics and CO2 and a preparation method thereof, the catalyst takes TiO2-x with oxygen vacancy defects as a carrier, through solvothermal reduction and ligand regulation strategies, dispersion anchoring of Ru monatomic and in-situ formation of Cu clusters are realized, and a highly synergistic metal-carrier interface structure is constructed. The catalyst can efficiently break a polyethylene C-C bond to activate C-H dehydrogenation and promote CO2 to participate in redox cycle in a CD-ROM drive environment, the yield of H2 and CO and the selectivity of synthesis gas are improved, Ru monatomic and Cu atom clusters have a synergistic effect with a TiO2 oxygen defect interface, carbon deposition can be effectively inhibited, the reaction activation energy is reduced, the catalytic stability is improved, and the catalyst is suitable for industrial production. And an efficient and sustainable new path is provided for resource conversion of the waste plastics and CO2.

Certain embodiments of the invention provide a supported cationic Ru catalyst that is highly active in catalyzing olefin metathesis. Certain embodiments of the invention also provide a method of making a supported cationic Ru catalyst described herein, comprising contacting a Ru catalyst with a silylium-capped support.

The application discloses a graphitized activated carbon supported ruthenium catalyst for synthesizing ammonia, which is prepared by the following steps: high-temperature heat treatment of activated carbon in an inert atmosphere, then reaming treatment in a mixed gas containing water vapor, obtaining graphitized activated carbon, then impregnation of a ruthenium precursor solution to introduce a ruthenium component, reduction, then introduction of a cerium compound in a solution, then introduction of carbon-containing organic matter, then impregnation of a barium salt solution, and reduction to obtain an ammonia synthesis catalyst with the graphitized activated carbon as a carrier, the ruthenium as an active component, and barium and cerium as additives. Compared with the graphitized carbon supported ruthenium catalyst prepared by the prior art, the catalyst prepared by the application has higher ammonia synthesis activity and has a good application prospect.

The Invention relates to a method Method for making a ruthenium catalyst comprising the steps of - Providing an aromatic dithiol substituted on adjacent aromatic carbon atoms with thiol groups, wherein in a first step an aromatic compound substituted with two leaving groups on adjacent aromatic carbon atoms are reacted with alkali trithiocarbonate to obtain an aromatic benzodithiole-thione, which in a subsequent step is reacted / hydrolysed with a base; - providing a zinc dithiolate compound by reacting the aromatic dithiol with a zinc carboxylate in an organic solvent; Reacting the zinc dithiolate compound with a ruthenium compound wherein X1 and X2 are, independently of each other, are anionic ligands and are the same or different; L and L2 are, independently of each other, neutral electron donor ligands and are the same or different; Ar is an aromatic group which may be substituted and that can be bridged with L, if L is an alkoxy group; - Obtaining a ruthenium catalyst of formula 4 or 4a, wherein R1 to R4 are, independently of each other, are selected from hydrogen, halogen, alkyl, aryl, or R.1 with R3, R3 with R4 or R2 with R4 are forming together an aliphatic or aromatic ring.

The invention provides a nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production as well as a preparation method and application of the nickel-iron-cobalt catalyst. The preparation method of the nickel-iron-cobalt catalyst for AEM water electrolysis hydrogen production comprises the following steps: S1, dissolving nickel salt in water to obtain a nickel-containing solution, dissolving iron salt in water to obtain an iron-containing solution, dissolving cobalt salt in water to obtain a cobalt-containing solution, and dissolving sodium borohydride in water to obtain a sodium borohydride solution; s2, uniformly mixing the nickel-containing solution, the iron-containing solution and the cobalt-containing solution to obtain a mixed solution; s3, mixing and stirring the mixed solution and a sodium borohydride solution to generate a large amount of precipitate, and further cleaning, drying and grinding the precipitate to obtain the nickel-cobalt-iron oxygen evolution catalyst. The nickel-iron-cobalt catalyst provided by the invention can replace an iridium oxide (ruthenium) catalyst. The catalyst has low overpotential when applied to AEM water electrolysis hydrogen production, long-time effective electrolytic reaction can be guaranteed, and meanwhile the cost of an AEM electrolytic cell is remarkably reduced.

The invention provides a method for preparing ethyl alkyl ethyl phosphinate through catalysis, which comprises the following steps of: after replacing air in a reaction kettle with inert gas, adding dialkyl alkyl phosphinate, halothane and a supported ruthenium chloride catalyst; and stirring and reacting at a certain temperature for a certain time to prepare alkyl ethyl phosphinic acid ethyl ester, and filtering to obtain the product. Compared with catalysts iodoethane and chloroethane, the chloroethane has the characteristics of low cost, easiness in obtaining and low toxicity, the reaction out-of-control risk is low due to low catalytic activity, and the reaction temperature can be reduced by combining the catalyst with the supported ruthenium chloride.

This invention provides a method for preparing a platinum-ruthenium catalyst for chlorine production, comprising: mixing nitrosylruthenium nitrate, platinum nitrate solution, deionized water, and a dispersant; heating to reflux temperature to dissolve; continuing the reaction at reflux temperature for 1 hour after the system changes from brownish-red to brownish-black; filtering the system after cooling to room temperature; and mixing the platinum-ruthenium mixture, silica hydrosol, and silica powder. The mixture is extruded into cylindrical pieces with a diameter of 5 mm, dried at 100-120°C for 6 hours to a breakage length of approximately 3-5 mm, and calcined in air at 200-240°C for 12 hours to obtain the platinum-ruthenium catalyst. This method can prepare a platinum-ruthenium catalyst with low chlorine impurity content that easily leads to catalyst aging. Simultaneously, because the reaction system remains acidic, the occurrence of ruthenium hydrolysis side reactions is reduced, resulting in a platinum-ruthenium catalyst with high yield, high ruthenium dispersion, and high catalyst activity.

To provide a method for producing a deuterated compound, by which the deuterated compound obtained by deuterating the hydrogen atom at the α - position of an α - amino acid or an α - hydroxy acid in high stereoselectivity can be produced in a high deuteration ratio in spite of a short time at a low cost, and which is also applicable to industrial production.SOLUTION: A method for producing a deuterated compound in which a hydrogen atom at an α - position of an α - amino acid or an α - hydroxy acid is deuterated, the method comprising allowing an α - amino acid or an α - hydroxy acid, heavy water, and hydrogen gas or heavy hydrogen gas to flow through a flow path filled with at least one catalyst selected from a ruthenium catalyst and a rhodium catalyst in the absence of a base to react the α - amino acid or the α - hydroxy acid with the heavy water.SELECTED DRAWING: None

Provided is a method for producing a cycloolefin, comprising subjecting a monocyclic aromatic hydrocarbon to partial hydrogenation reaction with hydrogen in an aqueous zinc sulfate solution in the presence of a ruthenium catalyst, wherein the aqueous zinc sulfate solution contains dimethylamine, and the partial hydrogenation reaction is performed with a nitrogen concentration in the aqueous zinc sulfate solution adjusted to 0.5 to 3000 mg / L or an acetic acid concentration in the aqueous zinc sulfate solution adjusted to 1 × 10-3 to 100 mg / L.

The invention discloses a dioxetane chemiluminescent probe suitable for a biological orthogonal catalytic reaction as well as synthesis and application of the dioxetane chemiluminescent probe. A phenolic hydroxyl group active site of the probe is protected by an allyl bio-orthogonal cleavable group, and when a ruthenium metal complex catalyst is not added, the probe is in a silence state, and a chemiluminescence signal is weak; and in the presence of the ruthenium catalyst, the protecting group can be specifically catalytically cracked and removed, so that the probe is quickly activated and converted into a luminous'on 'state, and a strong chemiluminescence signal is generated. According to the invention, efficient combination of biological orthogonal cutting reaction and chemiluminescence signal output is realized, and the prepared biological orthogonal chemiluminescence probe has an excellent on-off ratio and is suitable for high-contrast biological imaging of living cell and living body levels.

The invention discloses a preparation method and application of a tetragonal biconical titanium dioxide supported ruthenium catalyst, and the tetragonal biconical titanium dioxide supported ruthenium catalyst is obtained by preparing a tetragonal biconical anatase TiO2 carrier through combination of a hydrothermal method and calcination and then carrying out hydrothermal in-situ loading and reduction of a ruthenium compound solution by using glucose. The core advantage of the catalyst is the dual synergistic effect of the carrier and the electronic state: the tetragonal bipyramid structure endows the catalyst with high stability, and the deactivation of the catalyst can be greatly reduced; the electron transfer of Ru to the carrier weakens the adsorption energy of cyclohexene, a high-proportion special electronic state Ru beta / Ru alpha is obtained, the surface hydrophilicity is optimized, and the rapid desorption of the target product cyclohexene is promoted. In addition, the cost is reduced by utilizing biomass reduction, the high dispersity of Ru is realized, and under the Ru loading capacity of 10wt.%, when the benzene conversion rate of the catalyst reaches 48.67%, the cyclohexene selectivity reaches up to 82.25%, and the cyclohexene yield reaches 53.22%.

The invention discloses a preparation method of a silicon-acrylate compound. The method comprises the following steps: in the presence of a solvent, mixing a compound I, a compound II, a ruthenium catalyst and a hydrogen absorbent, and carrying out a heating reaction to obtain a compound I and a compound II; wherein the structural formulas of the compound I, the compound II and the compound III are shown in the specification. A ruthenium catalyst with lower catalytic activity and lower price is selected to carry out dehydrogenation coupling reaction on an acrylate compound containing terminal olefin and a C-Si bond of organic hydrogen silane; according to the silicon-containing acrylate compound disclosed by the invention, a tandem hydrosilylation reaction and a C-Si bond coupling reaction of an acrylate compound containing terminal olefin and silicon hydrogen can be realized, a novel silicon-containing acrylate compound is obtained, a synthesis method of the silicon-containing acrylate compound is enriched, and a more stable silicon-acrylate compound is synthesized; the method has the advantages of simple and easily-prepared initial raw materials, high synthesis yield, convenient operation in the synthesis process and the like.

The present invention discloses a ruthenium-loaded titanate nanowire catalyst, a preparation method thereof and an application thereof, belonging to the technical field of ruthenium-loaded catalysts. The preparation method of the ruthenium-loaded titanate nanowire catalyst comprises Step 1: dispersing nano-titanium dioxide in a solvent to obtain a first mixture; reacting the first mixture obtained in Step 1 under a certain pressure, and obtaining titanate nanowires after the reaction ends; dispersing the titanate nanowires obtained in Step 2 in a solvent to obtain a second mixture; adding an aqueous solution of ruthenium chloride to the second mixture obtained in Step 3, and stirring to obtain a third mixture; adding an aqueous solution of sodium borohydride to the third mixture obtained in Step 4, and stirring to obtain a fourth mixture, and obtaining a first precursor, namely the ruthenium-loaded titanate nanowire catalyst, after post-treatment. The catalyst prepared by the present invention shows excellent catalytic stability for the hydrocracking reaction of polyolefins, can be extended to the hydrocracking of commercial waste plastics, and the catalyst can be recovered and reused after the reaction ends.

This invention belongs to the field of catalyst technology, specifically relating to a supported iron-ruthenium catalyst and its application in the synthesis of m-dichlorobenzene and / or para-dichlorobenzene. The iron-ruthenium catalyst comprises a support and iron and ruthenium supported on the support. The support comprises quaternary ammonium salt-modified diatomaceous earth. Based on the total weight of the catalyst, the mass percentage of iron is 5-15%, and the mass percentage of ruthenium is 3-9%. The abundant active sites on the surface of the quaternary ammonium salt-modified diatomaceous earth support can significantly improve the catalytic activity and selectivity for m-dichlorobenzene and / or para-dichlorobenzene, without the formation of trichlorobenzene. The catalyst lifetime is 5-8 times longer than that of iron catalysts. The product can be separated and purified by stripping, distillation, and crystallization. The process is simple and can obtain high-purity m-dichlorobenzene and para-dichlorobenzene products.

The application discloses a polymer-coated mesoporous silica supported ruthenium catalyst and a preparation method and application thereof. The catalyst has a polymer-coated mesoporous silica inner core, wherein the surface of the silica inner core is grafted with triethoxysilane having an alkenyl group; the alkenyl group of the triethoxysilane serves as an active site; the polymer is formed by polymerization of a polymer monomer through the alkenyl group; and the catalyst is formed by further coordination of metal Ru. The particle size of the catalyst is between 400 nm and 600 nm. The supported ruthenium catalyst provided by the application can catalyze hydrogen transfer reduction of carbonyl compounds at a high yield (up to 99%) and high enantiomeric selectivity (up to 99%), can be recycled for 8 times through simple recovery, and is easy to be industrialized, and can reduce catalyst cost and pollution.

The invention discloses a synthesis method of 2-aryl-5-alkyl-3-pyridylthiophene, which comprises the following steps: by taking 3-pyridylthiophene, alkyl bromide and chlorobenzene as raw materials, catalyzing by using a ruthenium catalyst, and carrying out a three-component reaction by using a one-pot method to prepare the 2-aryl-5-alkyl-3-pyridylthiophene. According to the method, selective carbon-hydrogen bond activation of C2 and C5 sites of 3-pyridyl thiophene is realized by utilizing a ruthenium catalyst, so that precise bifunctional modification is completed in a single reaction system. According to the invention, the 2-aryl-5-alkyl-3-pyridyl thiophene with a clear structure is successfully constructed, and the technical vacancy of related fields in the aspect of regioselective one-pot bifunctionalization is made up. Compared with a traditional fractional step method, the method has the advantages of simplified reaction steps, convenience in operation, good functional group compatibility, relatively high chemical selectivity, regioselectivity, atom economy and the like, is suitable for efficient construction of various heterocyclic compounds, and has a good application prospect.

The invention discloses a method for preparing chain-length-controllable alkyl aromatic hydrocarbon by directionally converting thermoplastic plastic through a hierarchical pore MFI nanosheet supported ruthenium catalyst. The method comprises the following steps: mixing thermoplastic plastic, an MFI nanosheet carrier loaded ruthenium catalyst and cyclohexane, stirring and reacting for 9-18 hours in an inert atmosphere at the pressure of 0.1-1.0 MPa and the temperature of 230-250 DEG C to obtain alkyl aromatic hydrocarbon with controllable chain length, and controlling the ratio of the specific surface area of micropores to the sum of the specific surface areas of mesopores and macropores to be (0-1): (1.6-606) by controlling the stirring time to obtain the alkyl aromatic hydrocarbon with controllable chain length. The side chain length distribution of the obtained alkyl aromatic hydrocarbon main product is concentrated on 1-3 continuous carbon numbers in C2-C24, and the difference value of the number of carbon atoms is less than 3, so that the contradiction between the diffusion limitation of a macromolecular polymer and the product selectivity is effectively solved. The yield of the obtained alkyl aromatic hydrocarbon is up to 67.4-75.0%, the selectivity is up to 72.8-83.4%, and the industrial application value is remarkable.