1503 results about "Metal catalyst" patented technology

The invention discloses a method for preparing a carbon monoxide oxidation catalyst by using a waste vanadium-titanium catalyst and electroplating sludge, which realizes the mutual reaction of metal components in the electroplating sludge and components in the waste vanadium-titanium catalyst through the synergistic effect of various physical and chemical treatment methods and additives in the whole preparation process. The complex multi-metal catalyst can be used for photo-catalytic oxidation of carbon monoxide, has a remarkable oxidation effect and has a good application prospect.

The present disclosure relates to supported metal catalysts, such as biochar-supported atomically dispersed metal catalysts, and methods of using supported metal catalysts to remove contaminants, such as antibiotics and per- and polyfluoroalkyl substances (PFAS), from aqueous medium.

The invention provides a large-aperture alumina carrier as well as a preparation method and application thereof. The large-aperture alumina carrier is prepared from dry materials and water, and the dry materials comprise inert fibers, aluminum hydroxide and ammonium aluminum carbonate. According to the invention, under the condition of low water-powder ratio, primary pores and secondary accumulation pores in aluminum hydroxide and ammonium aluminum carbonate are reserved to the greatest extent under high extrusion pressure in the carrier extrusion and molding process due to the enhancement effect of inert fibers; although the apertures of the primary pores, the secondary accumulation pores and the macropores generated by decomposition of the ammonium aluminum carbonate are reduced during roasting of the carrier, the volume ratio of the pores with the pore size of more than 500nm in the final carrier is still obviously increased due to the existence of the inert fibers, and the volume ratio of the pores with the pore size of more than 500nm is 15-25%. In addition, the by-product ammonium aluminum carbonate generated in the recovery process of the waste ethylene oxide catalyst is used as the raw material and the macroporous pore-enlarging agent, so that the production cost of the large-aperture alumina carrier is reduced. The prepared large-aperture alumina carrier can be used for preparing a residual oil hydrodemetallization catalyst.

The invention discloses a pure silicon Beta molecular sieve packaging metal catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a silicon source, a template agent, a ligand, a metal salt and a mineralizer in water, carrying out a crystallization reaction at 120-200 DEG C, and carrying out calcination treatment and reduction treatment on the crystallized solid to obtain the pure silicon Beta molecular sieve packaging metal catalyst. The pure silicon Beta molecular sieve packaged metal catalyst is obtained. The pure silicon twelve-membered ring macroporous Beta molecular sieve encapsulated metal catalyst is prepared through a ligand protection in-situ hydrothermal synthesis strategy, so that the size of a metal nanocluster can be reduced, the high-temperature thermal stability of the metal nanocluster is improved, the adsorption and diffusion processes of guest molecules can be regulated and controlled, and the stability of the metal nanocluster is improved. Furthermore, the catalyst shows excellent catalytic performance when being used for catalyzing a propane dehydrogenation reaction and a methyl cyclohexane dehydrogenation reaction, and efficient and stable propane and methyl cyclohexane dehydrogenation performance is achieved.

The invention discloses a molybdenum-doped iridium-based multicomponent alloy core-shell structure PEM water electrolysis catalyst and a preparation method thereof, relates to the technical field of electrocatalysts, and forms an electrocatalyst material which takes precious metal iridium as a shell and transition metal cobalt and iridium as a core and is doped with transition metal molybdenum in the core shell. As the transition metal molybdenum has good corrosion resistance, the structure can improve the stability of the catalyst, and the transition metal is low in price, so that the cost of the catalyst can be reduced, and the activity among multi-metal catalysts is improved; meanwhile, the performance of the catalyst can be further improved by removing redundant metal on the surface and in the catalyst. The catalyst prepared by the method is high in OER activity, good in stability, low in cost and easy to industrialize, overcomes the defects of existing PEM water electrolysis hydrogen production, and has important value in the field of electrochemical application and practical engineering.

The invention discloses a preparation method for selectively oxidizing thioether into sulfoxide through photo-initiation, and belongs to the field of synthesis of medical compounds. The preparation method comprises the following steps that in the air atmosphere, a thioether compound is dissolved in an acetonitrile-water mixed solvent, inorganic metal salt catalysts such as ferric chloride and copper sulfate are added, the mixture reacts for 8-48 h at the temperature of 0-45 DEG C under illumination with the wavelength of 295-405 nm, selective oxidation is carried out, and the sulfoxide product is obtained, and the molar ratio of thioether to the catalysts is 5: 1. The method overcomes the problems of excessive oxidation risk, complicated operation, environmental pollution and the like caused by dependence of a noble metal catalyst and use of a strong oxidant in the existing thioether oxidation method, has the advantages of high catalytic efficiency, high yield and excellent selectivity, can greatly reduce the production cost, is suitable for later industrial synthesis and amplification, and has wide application prospects. The method has the advantages of no expensive metal catalyst or oxidant, simple preparation process, high efficiency, environmental protection, safety and cost saving.

The invention relates to the technical field of chemical production, in particular to a method and device for prolonging the service life of an active metal catalyst on line, and the method comprises the following steps: respectively carrying out activity recovery on the active metal catalyst by using an alkane solvent and a mixed gas containing H2, an ammonia-containing compound and an inert gas; the activity recovery comprises solvent circulation desolvation and hydrogen circulation cracking, and the solvent circulation desolvation comprises dissolution, internal circulation and / or external circulation; when gamma is more than gamma hydrogen and less than gamma solution, carrying out solvent circulation desolvation; when gamma is smaller than or equal to gamma hydrogen, hydrogen cycle cracking is carried out; when gamma is greater than or equal to gamma solution, reacting; gamma is the activity% of the catalyst at any stage; gamma hydrogen is a critical value for hydrogen cycle cracking, and gamma hydrogen is less than or equal to 60%; the gamma solution is a critical value of the solvent circulation desolvation, and the gamma solution is more than 60% and less than or equal to 80%. The method adopts a mode of combining solvent circulation desolvation and hydrogen circulation cracking, so that the activity of the catalyst is effectively improved, the service life is prolonged, and the number of times of unloading the catalyst is reduced.

The invention relates to a diffusion source for a neodymium-iron-boron magnet and a preparation method and application of the diffusion source. The invention discloses a rare-earth metal catalyst which comprises the following components in percentage by mass: 46%-49% of an organic solvent, 0.1%-2% of an adhesive, 0.1%-5% of a metal oxide and 46%-49% of rare-earth metal, and the melting point of the metal oxide is higher than that of the neodymium-iron-boron magnet. The specific organic solvent, the adhesive, the metal oxide and the rare earth metal are matched for use according to a specific matching relation, so that the diffusion source is more stable, the diffusion effect is improved, and when the magnet attached with the diffusion source is subjected to thermal diffusion treatment, the rare earth metal can be diffused into the magnet so as to improve the coercive force and other properties of the magnet. In the process, the high-melting-point metal oxide is adhered to the surface of the magnet and then serves as a spacer, the adhesion phenomenon of the magnet in the high-temperature sintering diffusion process is reduced or avoided, grain boundary diffusion is further promoted, and the performance of the magnet is improved.

The invention discloses a high-efficiency composite catalyst for waste gas purification and a use method thereof, belongs to the technical field of catalysts, and aims to solve the technical problems that a zeolite molecular sieve used as a VOCs catalyst in the prior art is high in hydrophilicity, easy to cause a catalyst poisoning phenomenon and low in adsorption efficiency. The method comprises the following steps; the preparation method comprises the following steps: mixing styrene, divinyl benzene, a hydrophobic metal catalyst and a polar monomer, adding a related auxiliary agent to obtain an oil phase, mixing the oil phase and a water phase, and carrying out post-process treatment to obtain the high-efficiency composite catalyst for waste gas purification. A zeolite molecular sieve is used as a carrier, a hydrophobic inorganic adsorption material is prepared through modification of a modified fluorine-containing silane coupling agent, then the hydrophobic inorganic adsorption material is soaked in a mixed transition metal oxide solution, and the hydrophobic metal catalyst is obtained and has the advantage of being high in catalytic efficiency.

The invention provides a Pt-Sn bimetallic catalyst and a preparation method and application thereof.The preparation method comprises the steps that 1, a Y molecular sieve is placed in a mixed solution of KOH and methyl alcohol, centrifugation and washing are conducted till the Y molecular sieve is neutral after stirring, drying and roasting are conducted, and a non-acid KY molecular sieve is obtained; the silica-alumina ratio of the Y molecular sieve is 3-100; 2) taking the non-acidic KY molecular sieve as a carrier, and loading Sn by adopting an atomic layer deposition technology to obtain a Sn-modified non-acidic KY molecular sieve; and 3) loading Pt by using the Sn-modified non-acidic KY molecular sieve as a carrier and adopting an atomic layer deposition technology to obtain the Pt-Sn bimetallic catalyst. According to the preparation method provided by the invention, spatial distribution of Pt and Sn is accurately regulated and controlled by combining an atomic layer deposition technology, so that the electronic state of Pt species is adjusted, alkane is promoted to be dehydrogenated into an olefin intermediate, and the aromatization catalytic activity and the aromatic hydrocarbon selectivity of alkane are improved.

The invention relates to the technical field of air electrode preparation, in particular to a metal-loaded super-hydrophobic air electrode, a preparation method and chlorine production application, the air electrode comprises a high-hydrophobicity gas diffusion layer obtained through polytetrafluoroethylene modification, and the metal-loaded super-hydrophobic air electrode is prepared through a corona etching and electrochemical in-situ deposition technology. A uniform and highly-dispersed metal catalyst layer directly grows on the surface of the polytetrafluoroethylene substrate, so that the gas diffusion electrode with excellent mass transfer performance and an efficient catalytic function is obtained; the prepared electrode is used for carrying out electrochemical catalysis on a water body containing chloride ions by adopting a cyclic voltammetry method, and active chlorine can be efficiently generated in situ; the prepared metal-loaded super-hydrophobic air electrode has the advantages of being low in oxygen mass transfer resistance, high in catalyst utilization rate, free of generation of by-products, capable of efficiently generating active chlorine and the like, and has wide application potential in actual water environment disinfection.

The invention relates to the technical field of fuel cells, and mainly relates to a carbon-supported metal catalyst and a preparation method thereof. The preparation method comprises the following steps: dispersing platinum acetylacetonate, acetylacetone salt of transition metal and a carbon material in a solvent, drying to remove the solvent to obtain a precursor, and annealing for the first time in an air atmosphere to obtain a mixture; annealing the mixture for the second time in a hydrogen-argon atmosphere, cooling, pickling, washing, drying, and annealing for the third time in the hydrogen-argon atmosphere to obtain the carbon-loaded metal catalyst. According to the preparation method, platinum and acetylacetone salt of transition metal are used, after uniform dipping, annealing is directly carried out in the air atmosphere, two-step gas phase reduction is carried out in the hydrogen argon atmosphere, the platinum-based intermetallic compound nano-particles wrapped by the adjustable carbon layer are prepared, particle aggregation is effectively prevented, the prepared catalyst is high in order degree, and the catalyst has good catalytic activity. And the particles are fine and uniformly distributed and have excellent activity.

The invention relates to the technical field of gas purification, and discloses a methane-removing nitrogen automatic regeneration type purification method which comprises the following steps: pretreatment of raw material gas: controlling the pressure and flow of a raw material gas inlet, and introducing the raw material gas into a gas-gas heat exchange device for primary heat exchange; performing catalytic reaction to remove methane: injecting oxygen into the raw material gas, mixing, heating by a heating device, introducing into a catalytic barrel, reacting methane with oxygen by using a rare metal catalyst to generate water and carbon dioxide, and automatically adjusting the oxygen injection amount by detecting the content of methane and oxygen in the gas at the outlet of a catalytic system, maintaining the temperature in the catalytic barrel in a specified interval; and cooling treatment: sequentially passing the raw material gas from which methane is removed through a gas-gas heat exchange device and a water-cooling heat exchange device, and cooling the raw material gas to a specified temperature. The methane removal nitrogen automatic regeneration type purification method aims at solving the problems that a purification system is low in regeneration efficiency and insufficient in automation degree.

An ammonia production method involves producing ammonia from nitrogen molecules, in a production device for performing electrolysis, in the presence of a metal complex and a solid catalyst in a cathode, by providing electrons from a power source, protons from a proton source, and nitrogen molecules from a means for supplying nitrogen gas, and by providing hydrogen molecules by sending hydrogen molecules to an anode including sending hydrogen gas produced at the cathode to the anode. Concerning a metal complex and a solid catalyst, as the metal complex, rac-ethylenebis(4,5,6,7-tetrahydro-1-indenyl) zirconium dichloride or the like is used, and as the solid catalyst, a metal catalyst or the like is used.

The invention relates to the technical field of chemical synthesis, and particularly discloses an alpha methyl beta phosphonate compound and a synthesis method thereof.The alpha methyl beta phosphonate compound is obtained by directly oxidizing the alpha position of aryl ketone into carbon positive and combining the carbon positive with diethyl phosphite anions under the alkaline condition by using hydrogen peroxide and iodine as oxidizing agents. The alpha methyl substituted beta phosphate ester compound can be generated by a one-step method. The method is suitable for synthesizing compounds of phosphoric acid (methyl, ethyl, propyl and the like) with different alkyl substitutes (methyl, ethyl, propyl and the like) at carbonyl alpha positions. According to the method, the alpha-methyl substituted beta phosphate compound can be synthesized only by using commercial cheap and easily available aryl ketone as a raw material, using hydrogen peroxide and iodine as oxidants and using diethyl hypophosphite as a phosphine source, and reacting in the DMSO solvent at 100 DEG C for 12 hours, so that the target product can be obtained, and the yield is excellent. Compared with previously reported methods, the method does not need low-temperature operation, is simple to operate, adopts a one-pot method, does not need a metal catalyst, and all raw materials are common bulk chemicals.

The present invention relates to the technical field of supported metallocene catalysts, and particularly relates to a supported metallocene catalyst additive, a preparation method thereof and an application. The supported metallocene catalyst additive has the following structure: #imgabs0#, wherein R is selected from C1-C10 alkyl groups, R1 and R3 are selected from alkyl groups and adamantyl groups and are in the ortho and para positions of -OH, R2 is selected from C1-C10 alkyl groups and cycloalkyl groups, and R' is selected from alkyl groups. This additive can greatly retain the catalytic activity and copolymerization performance of the metallocene catalyst, increase the metal loading and catalytic activity, and reduce the dosage of the traditional cocatalyst MAO.

The invention relates to a method for constructing a C-N bond or a C-C bond through an insertion reaction of oxygen-sulfur ylide and aromatic amine. According to the method, tris (pentafluorophenyl) borane is taken as a catalyst, oxygen-sulfur ylide and aromatic amine are taken as raw materials, and N-H or C-H insertion reaction is carried out under different temperatures and solvents. According to the method, the defect that a metal catalyst or an oxidizing agent is used traditionally is overcome, and on the basis of the method, various alpha-amino-acid ester derivatives or diaryl acetate derivatives can be obtained by using different aromatic amines and oxygen-sulfur ylide as substrates. According to the method, the raw materials are easy to obtain, the operation is simple, the use of a catalyst and an oxidizing agent is avoided, and the method is a mild, effective, feasible and environment-friendly method for preparing the alpha-amino-acid ester and the diaryl acetate and has important application value.

The invention relates to a [NN] bidentate coordination metal catalyst based on a quinoline skeleton as well as a preparation method and application of the [NN] bidentate coordination metal catalyst. According to the preparation method, quinoline-8-formaldehyde and aniline are directly subjected to aldehyde-amine condensation under the catalysis of p-TsOH, and a quinoline-imino ligand is synthesized. The [NN] bidentate coordination metal catalyst based on the quinoline skeleton is prepared by carrying out one-pot reaction on the obtained ligand and in-situ synthesized MMe4 (M is Ti, Zr or Hf). The quinoline skeleton [NN] bidentate coordination metal catalyst is used for polyolefin synthesis. The preparation method has the advantages of simple synthesis process, easily available raw materials, high product yield and high temperature resistance, is suitable for high-temperature solution polymerization, and can be used for preparing high-performance polyolefin elastomers.

A high thermal conductive silicone composition including: (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups in one molecule and a kinematic viscosity at 25 C of 100 to 100,000 mm2 / s; (B) an aluminum powder having an average particle size of 50 μm or more; (C) a thermal conductive filler having an average particle size of 0.1 to less than 50 μm; (D) an organohydrogenpolysiloxane having two or more hydrogen atoms bonded to a silicon atom (Si—H groups) in one molecule; (E) a hydrolyzable organopolysiloxane represented by the following general formula (1); and (F) a platinum group metal catalyst having an effective amount. The high thermal conductive silicone composition can conform to the warpage of a substrate due to an increased material thickness and can maintain heat dissipation performance due to a high thermal conductivity.

The invention belongs to the field of carbon nanomaterials, and relates to a cobalt molybdenum / magnesium aluminum metal catalyst, a preparation method and application thereof, and a preparation method of a carbon nanotube. The preparation method of the cobalt molybdenum / magnesium aluminum metal catalyst comprises the following steps: S1, carrying out chelation reaction on metal salt and small molecular organic acid in a solvent, adjusting the pH value of the obtained chelation product to 3-7.5, and mixing the chelation product with a modifier to form gel; and S2, roasting the gel to obtain the cobalt molybdenum / magnesium aluminum metal catalyst. The preparation method is characterized in that in the preparation process of the cobalt-molybdenum / magnesium-aluminum metal catalyst, small-molecular organic acid is used as a chelating agent, and a specific modifier is used as an accelerant and a stabilizer, so that the prepared cobalt-molybdenum / magnesium-aluminum metal oxide has good structural stability and catalytic performance, and when the cobalt-molybdenum / magnesium-aluminum metal oxide is used as a carbon nanotube synthesis catalyst, the catalytic performance of the catalyst is greatly improved. Not only can the carbon yield be improved, but also the few-walled carbon nanotube with small tube diameter and high length-diameter ratio can be obtained.

The disclosure relates to a method of producing a multi-metal catalyst film and of producing a reactor system for catalytic removal of a wide variety of contaminants (for example, nitrate, nitrite, perchlorate, chlorate, chromate, selenate, chlorophenols, 2,4-D, dicamba, atrazine, trichloroacetic acid, bromochloroiodomethane, NDMA, TCE, TCA, chloroform, freons, RDX, HMX, TNT, PFOA, and PFOS) from water and wastewater. The disclosure also relates to a method of using the multi-metal catalyst for the removal of such contaminants and a system comprising the multi-metal catalyst film for removing such contaminants.

The invention discloses a high-efficiency thick oil emulsification catalytic viscosity reducer and a preparation method thereof, and the high-efficiency thick oil emulsification catalytic viscosity reducer comprises the following components in percentage by mass: 5-15% of a solvent, 0.1-10% of a metal catalyst, 0.1-10% of a rare earth catalyst, 1-15% of an emulsifier, 1-10% of a hydrogen donor and the balance of water. The preparation method comprises the following steps: S1, weighing the metal catalyst and the rare earth catalyst, adding the metal catalyst and the rare earth catalyst into water, and carrying out ultrasonic treatment to obtain a catalyst dispersion liquid; s2, adding the solvent and the emulsifier into the catalyst dispersion liquid, and stirring at 30-70 DEG C for 1-5 hours to obtain a mixture; and S3, adding the hydrogen donor into the mixture, and uniformly stirring to obtain the efficient thick oil emulsifying and catalyzing viscosity reducer. The method is suitable for viscosity reduction exploitation of common thickened oil and super-thickened oil, and economic benefit development of the thickened oil at the temperature of 240 DEG C or below can be achieved without cooperation with a steam heating measure.

The invention discloses a method for catalyzing and photo-initiating nitro reduction through ferric trichloride, and belongs to the field of pharmaceutical compound synthesis. According to the method, transition metal salt is mainly used as a catalyst for reaction, inorganic acid and organic acid are used as additives, nitryl is reduced into amino under the condition of air or nitrogen, the catalytic efficiency is high, the yield of reduction products is high, the production cost is greatly reduced, and the method is suitable for synthesis and amplification of later compounds and has good application prospects. The method has the advantages of no expensive metal catalyst or reducing agent, simple preparation process, high efficiency, environmental protection, safety and cost saving.

The invention discloses a method for synthesizing degradable polyethylene through copolymerization of conjugated lactone and cycloolefin. The preparation method comprises the following steps: catalyzing ring-opening metathesis polymerization of alpha, beta-unsaturated lactone and a cycloolefin monomer by using a Grubbs catalyst, hydrogenating the obtained copolymer to prepare a series of polyethylene-like materials with different densities introduced into ester groups in a main chain, and simultaneously retaining the thermal and mechanical properties of high-density polyethylene; after the polyethylene material is degraded and recycled through alcoholysis, polyethylene-like with high molecular weight and excellent performance can be obtained again through a polycondensation method, and the problem that an existing polyethylene material is difficult to recycle is solved. The synthesis method is simple and convenient to operate, the polymer obtained by copolymerization of conjugated lactone and cyclooctene is high in molecular weight, and ester groups in a main chain are uniformly distributed. Regioselectivity of conjugated lactone polymerization is good, and an AB type monomer obtained after alcoholysis is beneficial to polycondensation to obtain a high-molecular-weight polymer. The hydrogenated product is pure white solid powder, has few metal catalyst residues, and is expected to replace a bulk polyethylene material.

The present invention provides a carbon-coated iron-molybdenum catalyst and a preparation method and application thereof, belonging to the technical field of catalysts. The present invention first prepares iron-molybdenum oxide, then mixes the iron-molybdenum oxide with a carbon source solution, so that the carbon source can be evenly attached to the surface of the iron-molybdenum oxide, and forms a carbon-coated iron-molybdenum catalyst through pyrolysis. The graphene carbon layer generated on the surface of the metal iron-molybdenum catalyst can effectively protect the internal metal catalyst, prevent it from oxidation, agglomeration and loss, and extend the service life. At the same time, this graphene carbon layer can also have a positive effect on the adsorption mode of reactant molecules on the active sites of the catalyst, optimize the catalytic reaction process, and improve the conversion rate of formaldehyde and the service life of the catalyst; the addition of a surfactant can effectively disperse the metal iron-molybdenum catalyst particles, prevent them from agglomerating and precipitating, improve the effective utilization rate of the active metal, and also facilitate the carbon layer to be evenly coated on the catalyst surface.

The invention discloses a method for preparing graphene coated inorganic nonmetal powder through chemical vapor deposition and a composite material prepared by the method. According to the method, graphene directly grows on the surface of inorganic non-metal powder through chemical vapor deposition to obtain the graphene-coated inorganic non-metal powder composite material, a metal catalyst and / or a non-metal catalyst are / is adopted in vapor deposition, the metal catalyst is fixed in a low-temperature area of a reactor for chemical vapor deposition, and the non-metal catalyst is fixed in a low-temperature area of the reactor for chemical vapor deposition. The temperature of the low-temperature region is lower than the melting point of the metal catalyst. According to the method, the catalyst (including the non-metal catalyst and / or the metal catalyst) is introduced into vapor deposition, high-quality graphene can be grown on the surface of the non-metal powder under the catalytic action of the catalyst, amorphous carbon and other impurity phases in the composite material are reduced, meanwhile, the use amount of hydrogen can be reduced, and the production safety can be improved.

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 method for preparing glyceric acid by catalytically oxidizing glycerol with a non-noble metal catalyst, which comprises the following steps of: catalytically oxidizing glycerol under the action of oxygen by taking a CuZrOx composite oxide as a catalyst to obtain glyceric acid; wherein the CuZrOx composite oxide is prepared by a deposition-precipitation method through high-temperature calcination. The internal structure of the catalyst is changed due to introduction of Cu, two metal components are combined more tightly and have strong interaction due to doping of Cu, and meanwhile, compared with a single-metal catalyst, the number of oxygen vacancies of the composite oxide catalyst is increased, the number of strongly acidic sites and strongly basic sites on the surface is increased, and the catalytic activity of the catalyst is improved. According to the present invention, the catalyst has a certain acid-base property so as to produce the good catalysis effect, such that the high glycerol conversion rate and the high glyceric acid selectivity are achieved while the production cost is reduced, and the catalyst can be repeatedly used.

The invention discloses a dechlorination regeneration method of a chlorine poisoning noble metal catalyst and an application of the regenerated noble metal catalyst in polyolefin hydrogenolysis, and the dechlorination regeneration method comprises the following steps: dispersing the chlorine poisoning noble metal catalyst in water, adding a strong nucleophilic reagent for treatment, and carrying out centrifugal separation, washing and drying treatment to obtain the chlorine poisoning noble metal catalyst. The regenerated noble metal catalyst is obtained. A strong nucleophilic reagent dechlorination regeneration strategy under a room temperature mild condition is provided, chemically inert metal-chlorine bonds are broken through a nucleophilic substitution effect, noble metal particles are prevented from being agglomerated and sintered while deep dechlorination is realized, polyolefin hydrogenolysis activity of the catalyst can be completely recovered, activity improvement can be realized, and the catalyst has a good application prospect. Meanwhile, the regeneration cost is greatly reduced, and the regenerated noble metal catalyst can be used for efficiently hydrogenolyzing, upgrading and recycling waste polyolefin to obtain liquid alkane fuel with high additional value.

The invention relates to the field of polyurethane, and discloses a preparation method of a linear reaction type phosphorus-nitrogen-silicon synergistic flame-retardant solvent-free polyurethane coating, which comprises the following steps: S1, carrying out exchange reaction on phosphonate and alcohol amine ester to obtain a phosphorus-nitrogen polyol intermediate; s2, carrying out condensation polymerization on the phosphorus-nitrogen polyol intermediate and chlorosilane to obtain phosphorus-nitrogen-silicon polyol; s3, mixing polyester / polyether polyol, a chain extender and an amine / metal catalyst to obtain a component A; mixing and reacting isocyanate, part of polyester / polyether polyol and phosphorus-nitrogen-silicon polyol to obtain a component B; mixing the component A and the component B, spraying the mixture on release paper, and curing. Through a synergistic flame-retardant mechanism of phosphorus, nitrogen and silicon, the balance of efficient flame retardance, mechanical properties and excellent coating properties is realized. The solvent-free system realizes zero emission of volatile organic compounds, and the linear reaction type design ensures that the mechanical properties and durability of the coating are not influenced.