658 results about "Efficient catalyst" patented technology

The invention relates to novel carbene ligands and their incorporated monomeric and resin / polymer linked ruthenium catalysts, which are recyclable and highly active for olefin metathesis reactions. It is disclosed that significant electronic effect of different substituted 2-alkoxybenzylidene ligands on the catalytic activity and stability of corresponding carbene ruthenium complexes, some of novel ruthenium complexes in the invention can be broadly used as catalysts highly efficient for olefin metathesis reactions, particularly in ring-closing (RCM), ring-opening (ROM), ring-opening metathesis polymerization (ROMP) and cross metathesis (CM) in high yield. The invention also relates to preparation of new ruthenium complexes and the use in metathesis.

The invention provides a preparation method of a high-efficiency catalyst for synthesizing vinyl acetate by an acetylene method. The oxidant is used to oxidize the surface of activated carbon used as a catalyst carrier to change the oxygen-containing functional groups on the surface of the activated carbon and improve its original pore structure, thereby effectively improving the loading capacity of the active component zinc acetate and significantly improving the catalyst efficiency. The invention has the advantages of cheap and easy-to-obtain raw materials, simple operation, high loading capacity of catalyst active components, good activity and long service life.

The invention provides a preparation method of a high-density transition metal monoatomic load graphene-based catalyst. The preparation method comprises the following steps of dissolving a nitrogen-containing precursor, a carbon source and a soluble transition metal salt, and performing evaporation drying, grinding and calcination to obtain the high-density transition metal monoatomic load graphene-based catalyst. According to the preparation method, only the soluble metal salt is utilized, glucose and the like are used as the carbon source, dicyandiamide is used as the nitrogen-doped source, and the high-efficiency catalyst with high active site density and high monoatomic loading quantity is successfully prepared only by one-step calcination method.

The invention relates to a biomass magnetic carbon material for degrading organic dye. The material is prepared by mixing a biological raw material and an iron precursor at a ratio of (2-20kg):1kg. Meanwhile, the invention also discloses a preparation method of the biomass magnetic carbon material. The biomass magnetic carbon material provided by the invention is cheap and efficient and has double effects of adsorption catalysis and degradation; serving as an efficient catalyst in a process of constructing a Fenton-like system for treating high-concentration wastewater, the biomass magnetic carbon material has high catalytic activity in thoroughly oxidizing and degrading organic dye; the degradation effect is better than that of a ferrous ion homogeneous catalysis reaction and a Fenton-like reaction taking ferroferric oxide as a catalyst.

The invention provides an efficient catalyst used in glycol synthesis through dimethyl oxalate hydrogenation, and a preparation method thereof. A hexagonal mesoporous silicon molecular sieve is taken as a carrier which carries copper and additive metal, and the mass ratio of the copper to the additive metal to the hexagonal mesoporous silicon molecular sieve is 0.25-0.6:0.04-0.4:1. The preparation method comprises the following steps: soluble nitrates of the copper and the additive metal are compounded to be a metal ion solution with the total concentration between 0.5 and 2 M in water; the metal ion solution is slowly dripped into an aqueous solution containing the hexagonal mesoporous silicon molecular sieve; the adsorption temperature is between 20 and 90 DEG C; the solutions continue to be stirred at a constant temperature, so as to prepare a precursor; and the precursor is washed, dried, progressively heated to 250 to 950 DEG C and roasted, so as to obtain the powdered efficient catalyst. The catalyst has the advantages that the catalyst has a regular pore structure and high specific surface area, and can be better dispersed after an active copper species is stabilized by the additive metal and dispersed by the hexagonal mesoporous silicon molecular sieve, and the catalyst shows excellent hydrogenation activity and glycol selectivity in the reaction of synthesizing glycol through the catalytic hydrogenation of dimethyl oxalate.

Polycarbonates containing low or undetectable levels of Fries rearrangement products and comprising repeat units derived from one or more of resorcinol, hydroquinone, methylhydroquinone, bisphenol A, and 4,4′-biphenol have been prepared by the melt reaction of one or more of the aforementioned dihydroxy aromatic compounds with an ester-substituted diaryl carbonate such as bis-methyl salicyl carbonate. Low, or in many instances undetectable, levels of Fries rearrangement products are found in the product polycarbonates obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reactions using diphenyl carbonate.

The invention discloses application of a nitrogen-doped porous carbon fixed Co@Pt nano-particle composite material, prepared by taking ZIF-67 as a template, as an efficient catalyst for oxygen reduction catalytic reaction of a cathode of a fuel cell. The application has the superiorities that (1) a synthetic method of the catalyst is simple and feasible, the shape of the catalyst is controllable, batch preparation can be realized, and the catalytic performance is very stable; (2) the oxygen reduction catalytic reaction of nitrogen-doped porous carbon fixed cobalt-platinum core-shell nano-particles in the cathode of the fuel cell shows that the nano-particles have good catalytic activity and excellent methanol poisoning resistance stability, and compared with traditional commercial Pt / C, the nano-particles have relatively high take-off potentials and half-wave-peak potentials (nano-particles: 0.99V and 0.87V, and Pt / C: 0.98V and 0.83V); and (3) metal organic frameworks (MOFs) for preparing the catalyst have sequential microcellular structures and relatively large specific surface areas and can be widely applied to the storage and conversion of energy sources. Therefore, a method for simply and directly preparing cheap and efficient cathode oxygen reduction electro-catalyst is provided for the fuel cell and has a wide application prospect.

The present invention provides a preparation method of supermacroporous polymer microsphere and its product. It is characterized by that said preparation method includes the following steps: adding high-content surfactant into oil phase containing monomer, making the oil phase containing monomer and surfactant be dispersed in water phase, making the above-mentioned material undergo the process of suspension polymerization so as to obtain supermacroporous microsphere. The grain size of said microsphere is 1-200 micrometers, and its porosity is 10%-90%.

Polycarbonates containing low or undetectable levels of Fries rearrangement products and comprising repeat units derived from one or more of resorcinol, hydroquinone, methylhydroquinone, bisphenol A, and 4,4′-biphenol have been prepared by the melt reaction of one or more of the aforementioned dihydroxy aromatic compounds with an ester-substituted diaryl carbonate such as bis-methyl salicyl carbonate. Low, or in many instances undetectable, levels of Fries rearrangement products are found in the product polycarbonates obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reactions using diphenyl carbonate.

The invention provides a catalyst for preparing methyl alcohol by carbon dioxide catalytic hydrogenation and a preparing method thereof, belonging to the technical field of catalysts. The catalyst is characterized in that: the catalyst for preparing the methyl alcohol by the carbon dioxide catalytic hydrogenation comprises components in mass ratio of CuO: ZnO: Al2O3: MgO being 3: 6: 1:X (wherein X is in the range of 0.001-0.2) and is prepared by a coprecipitation method. The preparing method comprises the following steps of: (1) dissolving weighed nitrate solutions of copper, zinc, aluminum and magnesium in absolute ethyl alcohol or water, dropping oxalic acid ethanol solution or oxalic acid water solution into the mixed solution, heating, and stirring to obtain the precursor of the catalyst; (2) drying the precursor of the catalyst, roasting for a period of time at certain temperature, cooling and then grinding, tabletting, crushing and sieving the precursor of the catalyst to obtain the catalyst for preparing the methyl alcohol by the carbon dioxide catalytic hydrogenation. Compared with the MgO-free catalyst with the same component mass ratio of CuO to ZnO to Al2O3, the catalyst has better activity, stability and methyl alcohol selectivity; the preparing method is simple, and has low cost and less pollution; and the catalyst is an effective catalyst for preparing the methyl alcohol by the carbon dioxide catalytic hydrogenation.

The invention relates to a preparation method of an antibacterial silver molybdate and graphite-phase carbon nitride composite visible-light-induced photocatalyst.The method comprises the following steps of preparing lamellar graphite-phase carbon nitride and preparing the silver molybdate doped graphite-phase carbon nitride composite photocatalyst.The preparation method of the antibacterial silver molybdate and graphite-phase carbon nitride composite visible-light-induced photocatalyst has the advantages that the preparation method is simple, and the preparation conditions are easy to control; the prepared silver molybdate doped graphite-phase carbon nitride composite photocatalyst is a green and environment-friendly efficient catalyst, has the advantages of being excellent in antibacterial property, free of secondary pollution, high in catalytic efficiency and the like and has practical application value.

This invention relates to a chelated calcium fertilizer, which is prepared from: catalyst 1-2 wt. %, inorganic calcium raw material 58-69 wt. %, and chelating agent 30-40 wt. %. The chelating agent is composed of: oxalic acid 5-10 wt.%, malic acid 8-20 wt.%, citric acid 15-25 wt.%, maleic acid 10-25 wt.%, sorbitol 3-8 wt.%, gallic acid 8-10 wt.%, and lactic acid 2-8 wt.%. The catalyst is composed of: gadolinium chloride 0.1-0.35 wt.%, selenium dioxide 0.1-0.2 wt.%, chalcanthite 0.05-0.1 wt.%, KOH 0.05-0.1 wt.%, potash 0.1-0.2 wt.%, and palladium carbonate 0.05-0.2 wt.%. The chelating agent has appropriate stability and low cost, and can chelate with calcium in solid state. Besides, the chelating agent cannot be deactivated in plants by hydrolysis or reacting with phosphate, sulfate and oxalic acid. This invention also relates to a method for preparing the chelated calcium fertilizer, which specifies the production process, process parameters, and chelating agent and high-efficiency catalyst needed.

A high-effective catalyst used for removing indoor formaldehyde at normal temperature includes a carrier, a noble active component, and an additive. The carrier is a mesoporous oxide including at least one of Al2O3, TiO2, SiO2, cerium oxide, cobalt oxide and manganese oxide; the active component includes a less amount of at least one of noble metals Pd, Pt, Au and Ag; the additive is at least one of Na, K, Fe, Co, Ce and Ni. The catalyst can completely convert the formaldehyde into CO2 and H2O at normal temperature under relative humidity of 50-90%. The catalyst has high catalytic-oxidizing activity and strong anti-moisture capability and is suitable for removal of the formaldehyde in a sealed or a semi-sealed space.

The invention relates to a method for synthesizing aliphatic polycarbonate polyols by transesterification synthesis. The transesterification is carried out on carbonate and aliphatic diols under the catalysis of a high-efficient catalyst, and the polycarbonate polyols with a plurality of structures and adjustable molecular weights and degrees of hydroxyl functional groups can be obtained by regulating the types of the diols. The method has the advantages of short reaction time, high utilization rate of equipment and reduced production cost, thereby leading the large-scale production and the applications of the aliphatic polycarbonate polyols to be possible. The method for preparing the aliphatic polycarbonate polyols comprises the following steps: adding a catalyst, butanediol and the carbonate into a reactor according to a certain material ratio, introducing nitrogen for replacing air in the reactor, increasing the temperature at normal pressure to 180-190 DEG C, carrying out reaction for 2-4h, dropping the pressure to 100-20000Pa, carrying out the reaction for 4-10h, and introducing the nitrogen for cooling a product, thereby obtaining the polycarbonate polyols.

The invention relates to a method for preparing colorless hydrogenated rosin ester resin. Rosin ester obtained by esterifying rosin purified through distillation is used as a raw material, catalytic hydrogenation is carried out under the action of a solvent and a high activity catalyst, the solvent is separated through distillation, and the colorless hydrogenated rosin ester resin is obtained. The product comprises the following key indexes of: no more than 100 of Hasson color number, no more than 20 mg / g of acid value, 80 to 110 DEG C of softening point and 0 to 15 gI2 / 100g of iodine value. The product can substitute a colorless hydrogenated petroleum resin product to be applied to the high-end adhesive. The method for preparing the colorless hydrogenated rosin ester resin is simple and easy, and the prepared product has the advantages of shadow color, lower iodine value, higher stability and lower preparation cost when being compared with the traditional products.

The invention relates to a high-efficiency catalyst for oxidizing low-concentration formaldehyde in indoor air into carbon dioxide and water at room temperature and normal humidity and a preparation method of the catalyst. The catalyst is characterized in that: cordierite honeycomb ceramic coated with TiO2-SnO2 composite oxide is taken as a carrier, and 0 to 5 percent of Pt is taken as an active ingredient. The catalyst has the advantages that: energy such as light, heat, electricity and the like and a chemical reagent are not required to be added, the formaldehyde removing efficiency is far higher than that of a photocatalysis technology and a plasma technology under the conditions of large air quantity, high humidity and the like, byproducts are not generated, and the catalyst is suitable for efficiently removing formaldehyde in closed or semi-closed spaces such as artificial board production workshops, living rooms, automobiles and the like.

In a process for liquid phase carbonylation of alcohols by carbon monoxide, the carbonylation reaction is carried out in a reaction zone at a temperature of 50° C. to 150° C. at a pressure in the range 0.5 MPa to 20 MPa in the presence of at least one catalyst comprising at least one rhodium and / or iridium complex and a halogenated promoter in at least one non-aqueous ionic liquid comprising at least one salt with general formula Q+A−, in which Q+ represents a quaternary ammonium and / or a quaternary phosphonium cation, said salt having a melting point of less than 90° C.; the non-aqueous ionic liquid containing at least the major portion of the catalyst is separated; and the separated non-aqueous ionic liquid containing at least the major portion of the catalyst is returned to the reaction zone.

A platinum-based nano catalyst supported carbon nano tube electrode and a manufacturing method thereof, more particularly to a manufacturing method of a carbon nano tube electrode and a carbon nano tube electrode supported with the platinum-based catalyst by growing the carbon nano tube on the surface of the carbon paper and using a CVD method on the surface of the carbon nano tube. By growing the carbon nano tube directly, the broad surface area and excellent electric conductivity of the carbon nano tube can be utilized maximally, and especially, the nano catalyst particles with minute sizes on the surface of the carbon nano tube by using the CVD method as a supporting method of the platinum-based catalyst on the surface of the carbon nano tube, the amount of the platinum can be minimized and still shows an efficient catalyst effect and by improving the catalyst activity by increasing the distribution, so academic and industrial application in the future is highly expected.

The invention discloses a high-performance catalyst for preparing olefin through dehydrogenation of light alkane and a preparation method thereof. The preparation method comprises the following steps of: steeping active components by adopting a steeping method of forming a stable complexing solution under the existence of an inorganic and / or organic acid, drying, burning, carrying out hydrogen reduction and activating to obtain the high-performance catalyst by taking high-temperature composite oxide containing one or mixture of multiple of aluminium oxide, magnesium oxide, zirconium oxide and zinc oxide as a carrier, one or multiple of metals such as ruthenium, rhodium, platinum and iridium as a main active component, one or multiple of metals such as germanium, tin or lead as a first additive, and one or multiple of alkali metals such as lithium, sodium, potassium, rubidium, cesium or francium as a second additive. Test results for light alkane dehydrogenation show that the catalyst has high catalytic activity, selectivity and stability.

The invention discloses a preparation method of glycolide. According to the preparation method, high purified glycolic acid crystal is taken as a raw material, and high-purity high-yield glycolide crystal can be synthetized through a series of steps such as dehydration polycondensation, melt phase polycondensation, depolymerization reaction and recrystallization purification. Glycolic acid oligomer is generated through glycolic acid polycondensation, and almost all the glycolic acid oligomers are depolymerized for preparing the glycolide under the action of a high efficient catalyst, the usage amount of the catalyst is low, the preparation technology is simple, the yield is high and the preparation method has industrial production potential.

The present invention relates to a field of control of nitrogen oxide pollution, and involves a high-efficient catalyst for denitration at low temperature and preparation method thereof, which comprises the steps: (1) preparing aqueous solution of cerium nitrate; (2) soaking mesoporous silica materials SBA-15 with aqueous solution from step (1), after stirring, filtrating, washing and drying; (3) calcining materials from step (2) to obtain evenly dispersed CeO2-SBA-15 materials; (4) preparing ethanol solution of manganese nitrate; (5) soaking CeO2-SBA-15 materials from step (3) with ethanol solution of manganese nitrate from step (4) and volatilizing ethanol, washing and drying; (6) calcining materials from step (5) to obtain evenly distributed MnxOy / CeO2-SBA-15 catalyst for denitration; The preparation method has simple process with lower cost, and the obtained MnxOy / CeO2-SBA-15 catalyst has uniform and ordered pores, large specific area, narrow pore size distribution, well dispersity of catalytic components, high catalytic activity, better effect of denitration at low temperature range and wider temperature range available for denitration.

The invention discloses a high efficiency catalyst used for compounding dioctyl phthalate which comprises titanium metal compounds, tin metal compounds, and other metal compounds; among which, the titanium metal compounds are titanic acid four phenyl ester, titanic acid four ethyl ester, silicic acid four alkane ester modified titanate or compound silicon dioxide carrier titanate; the tin metal compounds are stannous oxide, stannous oxalate, acetate diethyl tin, or dibutyl didodectyl acid tin; other metal compounds are ethylene glycol antimony, sodium aluminate, aluminum oxide, aluminum hydrous oxide plus sodium hydroxide, manganese oxide, cobalt oxide, antimony trioxide or zinc oxide. The catalyst used for compounding dioctyl phthalate of the invention has the advantages of improving reaction speed (Reaction time is improved within 3 hours from more than 8 hours in original technology), having a thorough esterification, and improving the quality of the product.

The invention provides a halogen-free flame retardant organosilane self-crosslinked polyolefin cable material which comprises a material A, a material B and a material C, wherein the weight ratio of the material A to the material B to the material C is (80-85):(3-5):(10-17); the material A is prepared from polyolefin resin, a plasticizer, a halogen-free flame retardant, saturated fatty acid, a cross-linking agent, an initiator and an antioxidant; the material B is prepared from polyolefin resin, a high-performance catalyst, an antioxidant, a metal ion inhibitor, a metal oxide and a material B processing additive; the material C is prepared from polyolefin resin, a halogen-free flame retardant, a coupling agent and an antioxidant. The invention further discloses a preparation method of the halogen-free flame retardant organosilane self-crosslinked polyolefin cable material. The halogen-free flame retardant organosilane self-crosslinked polyolefin cable material is environment-friendly, has favorable flame retardance, heat resistance, ageing resistance and processability, is simple in preparation process and low in energy consumption, and has relatively good economic benefits.

A PM catalyst regeneration control for the purpose of “soot removal” is performed prior to a sulfur poisoning recovery control. In the PM catalyst regeneration control, PM deposits in a catalyst are burned. A target throttle opening degree for the sulfur poisoning recovery control is preset smaller than a target throttle opening for the PM catalyst regeneration control in order to reduce the intake air volume during deceleration. A catalyst bed temperature is thus prevented from dropping, and therefore maintained at a level appropriate to sulfur poisoning recovery. Controlling the intake air volume during deceleration in such a manner results in more efficient catalyst recovery from sulfur poisoning, so that the fuel economy is maintained during the sulfur poisoning recovery control.

The invention belongs to the technical field of chemical industry, and particularly relates to an efficient catalyst for synthesizing methyl glycolate and ethylene glycol through gas-phase catalytic hydrogenation of dimethyl oxalate and a preparation method thereof. The catalyst is loaded with copper and other auxiliary metals by taking hydroxyapatite as a carrier. The preparation method of the catalyst comprises the following steps of: firstly preparing a hydroxyapatite suspension from calcium nitrate and diammonium hydrogen phosphate; adding soluble copper salt and soluble auxiliary metal slat, and performing metal loading by an ammonia distillation method; filtering; washing and drying the filter cake; and roasting to obtain a powdery catalyst for the gas-phase catalytic hydrogenation of dimethyl oxalate. Through the invention, controllable selectivity is realized on the hydrogenation products including methyl glycolate and ethylene glycol, the yield of methyl glycolate can reach 80% under low-temperature conditions, and the yield of ethylene glycol can reach 99% under high-temperature conditions; and the preparation method of the catalyst is simple and has good stability and relatively broad prospects in industrial application.

The invention discloses a simple preparation method of benzothiazole salt ionic liquid and application thereof to organic catalytic synthesis. In the invention, the benzothiazole salt ionic liquid has a novel structure, benzothiazole N-alkyl quaternary ammonium salt is used as cations (alkyl is one of n-C4H9, n-C5H11 and n- C6H13), BF4<-> or PF6<-> is used as anions. In the preparation method, benzothiazole, chloralkane, alkyl bromide and alkali metal salt or ammonium salt which contains the target anions react in one step under a solvent-free condition. In the invention, the one-step method is used for preparing the benzothiazole salt ionic liquid, therefore, the preparation yield is greatly increased, the use of substrates with high toxicity and high price is avoided, the consumption of organic solvents is reduced, the excessive use of a certain reaction component is avoided, the preparation process is simplified and high product yield is ensured. Therefore, the method has god economy and environmental friendliness and is suitable for mass preparation. The benzothiazole salt ionic liquid can be used as a mild, exclusive and efficient catalyst in benzoin condensation and Biginelli condensation and can be recycled and reused many times.

The invention belongs to the field of poly(trimethylene terephthalate) and the polyester thereof and particularly relates to poly(1,2-propanediol terephthalate), the polyester thereof and the preparation method thereof. The method can prepare cost-effective poly(1,2-propanediol terephthalate) and the polyester thereof from cost-effective 1,2-propanediol. The polymerization method is carried out by selecting a high-efficiency catalyst to well solve the difficult problem that 1,2-propanediol is not easy to be polymerized to prepare a high-molecular-weight polymer due to the low reaction activity of 1,2-propanediol, and can successfully prepare high-molecular-weight poly(1,2-propanediol terephthalate) and the polyester thereof. The poly(1,2-propanediol terephthalate) and the polyester thereof have excellent performance and can be widely used for preparing textiles, carpet fiber, thin film, engineering plastic, packaging material, etc.

This invention discloses a method for preparing surface-modified microspheres containing phosphazene, whose chemical structure in shown in this invention. The diameters of the microspheres are 0.3-2.0 mu.m, and the specific surface areas are 10-30 m2 / g. The method comprises: condensing hexachlorocyclotriphosphazene and 4, 4'-dihydroxy diphenyl sulfone in the presence of an acid binding agent to obtain crosslinked microspheres. The method is simple, and suitable for mass production. The obtained microspheres can be used in controlled release of drugs, high-efficiency catalyst carriers, novel electric materials, novel optical materials, and flame retardant materials.

The invention relates to a VOCs normal temperature degradation high efficiency catalyst, and a preparation method and applications thereof. According to the preparation method, a silicon aluminum composite oxide with a plurality of porous structures is taken as a carrier; active component MnO2 is dispersed on the surface of the porous silicon aluminum composite oxide carrier at a high dispersion degree, and MnO2 surface is loaded with a metal oxide auxiliary agent. Compared with the prior art, the advantages are that: the silicon aluminum composite oxide carrier possesses a plurality of porousstructures, effective absorption of VOCs molecules of different kinds and different sizes can be realized; highly dispersed active component MnO2 is capable of catalyzing ozone oxidation of VOCs molecules absorbed in pores and channels of the carrier, and the synergistic effect of the metal oxide auxiliary agent with the active component MnO2 is capable of promoting VOCs deep degradation into CO2and H2O, generation of by-product is reduced, effective degradation of residue ozone is realized at the same time, secondary pollution is avoided, at normal temperature, high VOCs desorption activityand high CO2 selectivity are achieved, no secondary pollution is caused, service life is long, the preparation method is simple, cost is low, the using conditions are mild, and potential industrial application value is achieved.

A process for preparing the high-dispersing carried catalyst by plasma includes carrying active components by dipping method or ion exchange method, drying, putting the catalyst in discharging tube, vacuumizing to 10-20 Pa, filling N2, O2, H2, or inertial gas to 10-1000 Pa, applying 200-5000 V across two electrodes for plasma treating for 10-500 min, and calcining at 300-600 deg.C for 3-7 hrs.