28 results about "Combinatorial catalysis" patented technology

The invention relates to the field of catalytic materials and discloses a copper-zinc-aluminum-alkylated graphite carbon combined catalyst as well as a preparation method and application thereof. The copper-zinc-aluminum-alkylated graphite carbon combined catalyst comprises a copper-zinc-aluminum catalyst and alkylated graphite carbon which are physically mixed, the alkylated graphite carbon is graphite carbon subjected to silane surface hydrophobic modification. The combined catalyst comprises a copper-zinc-aluminum catalyst and alkylated graphite carbon, and based on the hydrophobic property of the alkylated graphite carbon, in the reaction process of catalyzing CO2 hydrogenation to prepare methanol, the thermodynamic equilibrium limitation in the reaction of preparing methanol through carbon dioxide hydrogenation can be broken through by adjusting the equilibrium movement of element reaction, and the catalytic activity of the alkylated graphite carbon is improved. And meanwhile, agglomeration of metal particles can be effectively inhibited. Therefore, the combined catalyst of the present invention can exhibit efficient carbon dioxide conversion rate, excellent methanol selectivity and long-term stability.

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.

The present application discloses a method for preparing an organic carboxylic acid ester by alkoxycarbonylation of an olefinic unsaturated compound, and relates to the technical field of chemical intermediate preparation. The method includes: under the action of a combined catalyst including a palladium compound, a phosphine-containing ligand and an acidic additive, an olefinic unsaturated compound, CO and an alcohol are subjected to an alkoxycarbonylation reaction to generate an organic carboxylic acid ester in the presence of an inhibitor; the olefinic unsaturated compound has a structural formula wherein R is an alkyl group, a carboxyalkyl group or an ester alkyl group having a total carbon atom count of 1 7; the inhibitor is selected from one or more of a phenolic inhibitor, a quinone inhibitor, an aromatic amine inhibitor and a metal salt inhibitor. The present application solves the problem that the conversion rate and yield of the existing olefinic unsaturated compound alkoxycarbonylation reaction are low and the Pd-based catalyst is difficult to recycle, and improves the recovery rate of metal Pd while improving the catalytic activity of the Pd-based catalyst.

The present application relates to the technical field of lubricating oil base oil preparation, in particular to a hydrogenation isomerization-cracking combined catalyst suitable for preparing base oil from Fischer-Tropsch synthesis wax hydrocracking tail oil raw material with a normal alkane content of not more than 30wt%, and application thereof.The catalyst composition is composed of a hydrogenation isomerization-cracking catalyst with specific particle size AEL structure heteroatom aluminum phosphate molecular sieve and specific particle size MTT structure heteroatom aluminum silicate molecular sieve loaded with noble metal.The catalyst composition provided by the present application is applied to the hydrogenation isomerization / cracking process in the hydrogenation isomerization / cracking-supplement refining of Fischer-Tropsch synthesis wax hydrocracking tail oil conversion, which can significantly improve the yield of lubricating oil base oil, and obtain higher yield of low pour point, high viscosity index base oil.

The application discloses a hydroisomerization catalyst and a method for processing Fischer-Tropsch synthesis soft wax into lubricating base oil. The hydroisomerization catalyst is a combined catalyst, comprising catalyst A and catalyst B; wherein the catalyst A is a platinum and / or palladium loaded molecular sieve with a TON structure, and the catalyst B is a platinum and / or palladium loaded molecular sieve with a *MRE structure. The catalyst is used for processing Fischer-Tropsch synthesis soft wax into lubricating base oil. After vacuum distillation of a Fischer-Tropsch synthesis soft wax raw material, a fraction with a distillation temperature greater than 550 DEG C is removed by evaporation, and a fraction with a distillation temperature less than or equal to 550 DEG C is introduced into a hydroisomerization reaction zone. Hydroisomerization and moderate cracking of the soft wax are completed on the hydroisomerization catalyst based on the combined TON structure and *MRE structure molecular sieve shape channel and specific catalytic performance, and a hydroisomerization cracking oil is obtained. The obtained hydroisomerization cracking oil can be processed into low pour point and high viscosity index lubricating base oil by a supplemental refining-fractionation process with a high yield.

The present application relates to the technical field of pyrolysis catalyst preparation, and discloses a catalytic pyrolysis combined catalyst and a preparation method thereof. 3 The bulk density of the catalyst B is 0.81-0.87 g / cm 3 The bulk density ratio of the catalyst A to the catalyst B is 0.88-0.95; and the weight ratio of the Y-type molecular sieve contained in the catalyst A and the catalyst B is 2-4:1. The combined catalyst has good anti-wear performance, high low-carbon olefin yield and propylene selectivity in heavy oil catalytic cracking, and can improve the low-carbon olefin yield without increasing the heavy oil and diesel yield.

A catalyst composition including a metal oxide catalyst having a surface containing M-O site pairs of the acid-base Lewis type and of balanced acid-base strength; and a cracking component. The catalyst composition as disclosed herein is used in treating a variety of feeds including, but not limited to, naphtha, pyrolysis oil, polyolefins, or a combination thereof. The bifunctional catalytic nature of the catalyst composition enables catalytic cracking as well as hydrogenation and dehydrogenation reaction for the conversion of long-chain alkanes to mixture of short chain alkanes and alkenes using a catalyst composition based on metal-oxides that avoids the use of precious metals.

The invention discloses a catalytic purification method and device for HCN-containing waste gas and application of the catalytic purification method and device, and relates to the technical field of waste gas purification, the catalytic purification method for the HCN-containing waste gas comprises the following steps: mixing the HCN-containing waste gas with air optionally, heating, carrying out combustion reaction treatment in the presence of a catalyst, and discharging after treatment; the catalyst includes a structured transition metal-based catalyst. According to the invention, the efficient core-shell catalyst is preferably selected and the two-section combined catalyst bed layer is adopted, so that the waste gas can be deeply purified and then discharged after reaching the standard under the condition of lower gas inlet temperature (250 DEG C), and meanwhile, the filter unit with a specific structure is preferably adopted, so that zero emission of HCN is realized.

Disclosed is a method for preparing an organic carboxylic ester by using a combined catalyst of an aryl bidentate phosphine ligand. The method includes subjecting a terminal olefin, carbon monoxide, and an alcohol to a hydroesterification reaction in the presence of a combined catalyst of a palladium compound, an aryl bidentate phosphine ligand, and an acidic additive, to generate an organic carboxylic ester having one more carbon atom than the terminal olefin.

The invention discloses application of an organic boron and guanidine / phosphazene base combined catalyst and a high-molecular-weight polyester synthesis method, relates to the technical field of polyester synthesis catalysis, and solves the problems of low polymerization rate, limited monomer application, over-wide molecular weight distribution and the like in the prior art. The high-molecular-weight polyester is synthesized on the basis of efficient and controllable ring-opening copolymerization of cheap monomers including styrene oxide / vinyl ethylene oxide and phthalic anhydride. The number-average molecular weight of the high-molecular-weight polyester is 5.02 thousands to 16.33 thousands, and the molecular weight distribution is 1.22-1.58. The method comprises the following steps: adding an organic boron and guanidine / phosphazene base combined catalyst, epoxide and anhydride into a reaction container under anhydrous and anaerobic conditions, reacting for a certain time at a specific temperature, diluting the obtained mixture with dichloromethane, slowly dropwise adding into excessive ethanol to precipitate a polymer, and filtering and drying to obtain the high molecular weight polyester. The method can be used for synthesizing high-molecular-weight polyester, and has a good application prospect.

The invention provides a preparation method of polyethylene oil, which comprises the following steps: fully contacting ethylene with a nickel metal combined catalyst and carrying out polymerization reaction to obtain the polyethylene oil, wherein the nickel metal combined catalyst comprises a main catalyst and a co-catalyst in a molar ratio of 1: (100-1000), the co-catalyst is aluminum alkyl, and the main catalyst is a bidentate nitrogen-doped nickel complex. According to the present invention, the substituent group of the amido of the adopted bidentate aza-matched nickel complex in the nickel metal combination catalyst is the flexible alkyl group with small steric hindrance, and the substituent group of the imine is the rigid aryl group with large steric hindrance, such that the highly branched low molecular weight polyethylene oil can be prepared with the catalyst under the high pressure at the high activity so as to improve the polyethylene oil yield.

This invention discloses a cobalt-catalyzed migration asymmetric spirocyclic cyclocyclization method for quinoline compounds. This method utilizes a cobalt and ligand combination catalysis to achieve migration asymmetric spirocyclic cyclocyclization of quinoline compounds, belonging to the fields of organic chemistry and medicinal chemistry. Under the influence of a cobalt source, chiral ligands, achiral ligands, reducing agents, and additives, this invention enables the reaction of aryl / alkenyl-substituted quinolines / intramolecularly migrating quinolines with different alkynes in organic solvents, yielding a series of spirocyclic chiral dihydroquinoline compounds with excellent enantioselectivity and good yields. This invention only requires different ligands to regulate the reaction, enabling migration asymmetric dearomatization spirocyclic cyclocyclization from aryl to aryl, migration asymmetric dearomatization spirocyclic cyclocyclization from aryl to alkenyl, and intramolecular migration asymmetric dearomatization spirocyclic cyclocyclization reactions. It has a wide substrate applicability and produces diverse product structures, providing a novel and universal method for the systematic synthesis of chiral spirocyclic dihydroquinoline compounds.

The invention discloses a preparation method of a Fe-based catalyst for preparing ethanol through CO2 hydrogenation in the technical field of catalysts, which comprises the following steps: step 1) solution mixing: dissolving iron salt and a complexing agent in water and fully stirring to form a uniform solution, and aging and washing to obtain a material; (2) drying the solution: putting the material obtained in the step (1) into a drying oven, and carrying out drying operation to obtain a dried material; (3) calcining a precursor: calcining the material obtained in the step (2) in a muffle furnace in calcining equipment to obtain a catalyst; 4) atmosphere treatment: carrying out atmosphere treatment on the material obtained in the step 3) to obtain an active component iron species; and step 5) carrier loading: loading an active component iron species on the carrier to obtain the combined catalyst, the Fe-based catalyst which is mild in reaction condition, simple in preparation method, environment-friendly, energy-saving and high in economic benefit is obtained, and the Fe-based catalyst can be used in preparation of ethanol by hydrogenation of carbon dioxide.

Disclosed in the present invention is a method for efficiently preparing succinaldehyde. A microchannel reactor is used, and the method comprises the following steps: step 1, constructing a microchannel reactor system, the microchannel reactor system comprising a feeding module, a microchannel reaction module, a temperature control module, and a product collection module; and step 2, separately pumping an aqueous solution containing a catalyst and 2,5-dimethoxytetrahydrofuran into the microchannel reaction module by means of the feeding module and mixing for reaction to obtain a succinaldehyde aqueous solution, wherein the catalyst is trifluoroacetic acid and 2,2,6,6-tetramethylpiperidine oxide. In the method for preparing succinaldehyde as provided by the present invention, a microchannel reactor is used, and the present invention has a fully automated production process, high control accuracy, a safe and stable reaction process, easy operation, low production costs, and a short reaction time, and achieves a high content of succinaldehyde in the resulting succinaldehyde aqueous solution. The use of a combined catalyst (trifluoroacetic acid + Tempo) effectively shortens the reaction time, and also inhibits the generation of by-products.

The invention discloses a combined catalyst for low-temperature flue gas oxidation and denitration and a preparation method thereof. On one hand, the invention provides a combined catalyst for low-temperature flue gas oxidation and denitration, and the combined catalyst comprises a catalyst A and a catalyst B, the catalyst A comprises a honeycomb-shaped carrier and a load, and the load comprises FeOx, CrOx and MnOx; the catalyst B is a honeycomb catalyst, and the catalyst B is prepared from the following components in parts by mass: 5 to 15 parts of a TiO2 / SnO2 compound, 30 to 50 parts of a compound a, 40 to 60 parts of a compound b and 0.4 to 0.8 part of SiO2. On the other hand, the invention provides a preparation method of the combined catalyst for low-temperature flue gas oxidation and denitration. The catalyst is good in catalytic effect, the optimal catalytic temperature is lower than 200 DEG C, CO oxidation and NOx reduction can be synergistically catalyzed, and the catalyst is not prone to being affected by other components in flue gas.

The application discloses a method for synthesizing conjugated dienyl ester compounds with high regioselectivity. Specifically, the method is a method for preparing a series of conjugated dienyl ester compounds by catalyzing C5-regioselective esterification reaction of 1,4-dienyl alcohol and free carboxylic acid through combination of an iridium catalyst and a phosphoramidite ligand, and belongs to the field of organic synthesis. The specific operation steps are as follows: an iridium catalyst and a phosphoramidite ligand are added into a reaction tube, a solvent is added, and the iridium and the ligand are fully combined through stirring, then 1,4-dienyl alcohol, a carboxylic acid compound and an additive are added, and then the reaction is carried out at room temperature; after the reaction is completed, quenching and purification are carried out to obtain the conjugated dienyl ester compound. The method has the advantages of good substrate applicability, mild reaction condition, high regioselectivity and high E-selectivity.

The invention discloses an enzymatic production process for diglyceride, and relates to the technical field of biological enzyme catalysis. According to the process, a double-enzyme combined catalysis system is adopted, wherein immobilized lipase A is a copper oxide nano-enzyme complex, and a carrier is porous silicon dioxide subjected to APTES amination treatment; the immobilized lipase B is mucor lipase immobilized by a meso-porous silicon material. Adsorption resin containing tertiary amine groups is added into a reaction system to serve as a polar adsorption material, excessive glycerin is selectively adsorbed, and the effective concentration of glycerin is regulated and controlled. The copper oxide nano-enzyme complex is prepared by chemical precipitation of copper sulfate and sodium hydroxide, and has lipase-like activity and excellent ester exchange catalytic ability. According to the catalytic system, the vegetable oil conversion rate reaches 87.7% or above, the diglyceride product purity reaches 92.7% or above, the product yield exceeds 82.7%, the enzyme activity retention rate exceeds 91.3%, and a new technical path is provided for efficient preparation of functional grease.

The invention discloses a method for catalytic depolymerization and pre-deoxidation before coal liquefaction and a preparation method of a water-soluble catalyst or an oil-soluble catalyst, and belongs to the field of clean and efficient utilization of coal. The method comprises the following steps: 1) preparing a coal sample to be treated: crushing and grinding a raw coal sample, and carrying out airflow classification on the raw coal sample until the particle size of at least 90% of particles is less than 0.074 mm; 2) selection of a catalyst: a water-soluble catalyst or an oil-soluble catalyst is adopted, the cation is one or any combination of Fe < 3 + >, Fe < 2 + >, Ni < 2 + >, Zn < 2 + >, Co < 2 + > and Cu < 2 + >, and the anion is one or any combination of NO3 <->, SO4 < 2->, Cl <->, PO4 < 3->, BO3 < 3->, COOH <-> and C17H33COO <->; and (3) premixing the catalyst and the coal sample: adding an auxiliary agent into the water-soluble catalyst or the oil-soluble catalyst, weighing the catalyst according to the condition that metal atoms in the catalyst account for 0.001%-1% of the mass of dry coal, uniformly adding the liquid-phase catalyst to the surfaces of coal particles by adopting a spraying method, ultrasonically stirring for 30 minutes to 2 hours, standing for 2 to 10 hours, and taking the coal sample after standing as a pre-deoxidized sample for later use.

This invention discloses an enzymatic production process for diglycerides, belonging to the field of bio-enzyme catalysis technology. The process employs a dual-enzyme combined catalytic system: immobilized lipase A is a copper oxide nanozyme complex, with porous silica treated with APTES ammoniation as the carrier; immobilized lipase B is a *Mucor* lipase immobilized on mesoporous silica material. An adsorption resin containing tertiary amine groups is added to the reaction system as a polar adsorbent to selectively adsorb excess glycerol and control the effective glycerol concentration. The copper oxide nanozyme complex is prepared by chemical precipitation of copper sulfate and sodium hydroxide, exhibiting lipase-like activity and excellent transesterification catalytic ability. This catalytic system achieves a vegetable oil conversion rate of over 87.7%, a diglyceride product purity of over 92.7%, a product yield exceeding 82.7%, and an enzyme activity retention rate exceeding 91.3%, providing a new technical route for the efficient preparation of functional oils.

The invention discloses a nickel-catalyzed asymmetric hydroarylation method and application of olefins, uses nickel and two types of ligands to relay and combine catalysis to realize the method for the migration asymmetric hydroarylation of nitrogen-containing olefins and its application in preparing nicotine (S)-Nicotine and small molecule inhibitors, and belongs to the field of organic chemistry and medicinal chemistry. The present invention, under the action of a metal nickel source, a chiral ligand, a base, a hydrogen source, an additive, etc., reacts nitrogen-containing olefins with an aryl bromide compound in an organic solvent, and obtains chiral α-(hetero)aryl-substituted amine compounds with excellent regioselectivity and enantioselectivity. The present invention uses easily available olefins and commercially available aryl bromides as raw materials, and produces abundant metal nickel as a catalyst. By combining a simple migration ligand and asymmetric coupling with a simple structure and function, the design and screening of a single chiral ligand with a complex structure is avoided, and the dual functions of migration and asymmetric coupling are achieved; the reaction conditions are mild, the functional group compatibility is good, and the operation is simple.

The application discloses a low-temperature flue gas oxidation and denitration combined catalyst and a preparation method thereof. In one aspect, the application provides a low-temperature flue gas oxidation and denitration combined catalyst, which comprises catalyst A and catalyst B; the catalyst A comprises a honeycomb carrier and a load, and the load comprises FeO x , CrO x and MnO x ; the catalyst B is a honeycomb catalyst, and the mass ratio of components of the catalyst B comprises 5-15 parts of a TiO2 / SnO2 composite, 30-50 parts of a composite a, 40-60 parts of a composite b and 0.4-0.8 parts of SiO2. In another aspect, the application provides a preparation method of the low-temperature flue gas oxidation and denitration combined catalyst. The catalyst has a good catalytic effect, an optimal catalytic temperature is lower than 200 DEG C, can synergistically catalyze CO oxidation and NO x reduction, and is not easily affected by other components in flue gas.

The invention provides a combined catalyst and application thereof, and belongs to the technical field of fine chemical engineering. The combined catalyst consists of a phase transfer catalyst, an antioxidant and a buffering agent, the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, disteaxyl thiodipropionate, triphenyl phosphate and pentaerythritol diphosphite ester; and the antioxidant is one or more of dibutyl thiodipropionate, disteaxyl thiodipropionate, triphenyl phosphate and pentaerythritol diphosphite ester. The buffering agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate. The combined catalyst is high in activity, and when the combined catalyst is used for a reaction for synthesizing sodium thiocyanate and chloropropyltriethoxysilane, the conditions are mild, the dosage of the combined catalyst is small, control is easy, operation is easy, the synthesis reaction time is short, the yield is high, few by-products are generated, the production cost is reduced, and the yield and quality of the product are improved.

The application provides a combination catalyst and application thereof, and belongs to the technical field of fine chemical industry.The combination catalyst is composed of a phase transfer catalyst, an antioxidant and a buffer agent; the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, dioctadecyl thiodipropionate, triphenyl phosphite and pentaerythritol diphosphite; and the buffer agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate.The combination catalyst has high activity, and when used in the reaction of synthesizing sodium thiocyanate and chloropropyl triethoxysilane, the combination catalyst has mild conditions, small dosage, easy control, simple operation, short reaction time, high yield, few by-products, reduced production cost, and improved product yield and quality.

The application discloses a polyphosphoric acid surface modified metal-based catalyst and a preparation method and application thereof. The catalyst comprises a metal compound and polyphosphoric acid surface modification thereof. The type of metal in the catalyst comprises at least one of Mg, Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ba, Sr, Pb and Ti. The metal compound is one of fluoride, oxide, sulfate and nitrate of any one of the above metals or a combination of any two to three thereof. The source of polyphosphoric acid in the catalyst comprises at least one of inorganic phosphate, hypophosphite, phosphite or phosphoric acid ester compound. The polyphosphoric acid surface modified metal-based catalyst prepared by the application has higher selectivity and stability in the reaction of preparing fluorine-containing olefins (HFOs) through gas phase dehydrofluorination of fluorine-containing alkanes and gas phase dehydrochlorination of fluorine-containing chloroalkanes (HCFCs), improves the service life of the catalyst, and is not easy to form carbon deposition in the reaction, has high yield of target products, high conversion rate of raw materials and is easy to be industrialized.

This invention discloses a bacterial strain and method for producing notoginseng extract, belonging to the field of bioengineering technology. This invention constructs recombinant cells or combinations of recombinant cells expressing alcohol dehydrogenase, amine dehydrogenase, ATP-dependent peptide synthase, polyphosphokinase 2-I, and polyphosphokinase 2-II, or replaces polyphosphokinase 2-I and polyphosphokinase 2-II with polyphosphokinase 2-III. The recombinant cells or combinations of recombinant cells are used to catalyze the synthesis of notoginseng extract from serine and oxalic acid. Using 100 g / L L-serine as a substrate, a maximum yield of 173 g / L L-notoginseng extract can be obtained. Therefore, this invention has good prospects for industrial application.

The present invention discloses a strain and method for producing β-elemene, and belongs to the field of bioengineering technology. The present invention constructs a recombinant cell expressing farnesol kinase, farnesyl phosphate kinase, polyphosphate kinase 2, and a combination of recombinant cells of germarene A synthase, and utilizes the recombinant cell or the combination of recombinant cells to catalyze farnesol to synthesize β-elemene. The substrate of the present invention is cheap, easily available, and the present invention can obtain 17g / L β-elemene by adding 20g / L farnesol reaction for 24h. Therefore, the present invention has good industrial application prospects and is conducive to the large-scale production of β-elemene.

Combined catalyst for the thermocatalytic cracking of methane into hydrogen and solid carbon, comprising (a) an electrically conductive, structure-forming base body designed as a resistance heating element, made of a high-temperature-resistant metallic material or a metallic alloy, (b) wherein the base body is designed such that it can be directly heated by ohmic resistance heating when current flows through it and simultaneously serves as a mechanical support structure for catalytically active surfaces, (c) at least one metallic catalytically active surface arranged on the base body, in particular based on nickel, iron, cobalt or their alloys, (d) at least one open-pored and / or sectionally applied carbon layer or carbon coating arranged on the metallic surface, which is at least partially catalytically active, (e) wherein the carbon layer is designed such thatthat gas passage of methane to the metallic active surface remains possible,(f) wherein the base body, the metallic active surface and the carbon layer are functionally combined to form a single directly heated catalytically active structure in which the heat required for the endothermic methane pyrolysis is generated essentially at the site of the reaction,(g) and wherein the combined catalyst is designed such that carbon formed during operation acts at least partially as a catalytically active surface and / or can be periodically or continuously removed.

This application provides a combined catalyst for the tandem reaction of syngas to prepare straight-chain alcohols and a method for preparing straight-chain alcohols using the same catalyst, relating to the field of catalysis. The combined catalyst for the tandem reaction of syngas to prepare straight-chain alcohols comprises an independent first catalyst and a second catalyst. The first catalyst includes a first active component, a first promoter, and a first support. The first active component is Ru, the first promoter corresponds to the metal Na, and the first support is amorphous silica. The second catalyst includes a second active component, a second promoter, a third promoter, and a second support. The second active component is Rh, the second promoter corresponds to the metal K, the third promoter corresponds to the metal Zn and / or Fe, and the second support is an MFI-type molecular sieve composed of pure silicon. The combined catalyst provided in this application allows for efficient coupling of the two catalysts in different reactors within the same reaction apparatus, resulting in highly selective straight-chain alcohol products.