33 results about "Redox catalyst" patented technology

The invention relates to a method for controlling the catalytic window of the exhaust line of motor vehicles with thermal engines (M), said line comprising, upstream, a first three-way redox catalyst (TWC) associated, on the one hand, with a first oxygen sensor (S1) and, on the other hand, with a second oxygen sensor (S2) and, downstream, a second three-way redox catalyst (UFC), said window being modulated from the quantity of oxygen detected in the first catalyst by the first oxygen sensor (S1), characterized in that the catalytic window is modulated by taking into account, in addition, the quantity of oxygen present jointly in the second catalyst (UFC) and detected by said second oxygen sensor (S2). Figure 1

The application discloses a method for electrochemically synthesizing oxothiazolazine alkane compounds, which utilizes an electrochemical sulfur and oxygen oxidation method for olefins by using olefin radical cations and diprotic nucleophiles, can synthesize N / S heterocyclic compounds in a single reaction container, utilizes easily obtained thiols and styrene azide, does not need external oxidants or redox catalysts, can synthesize N / S heterocyclic compounds in a single reaction container, and can widen the way of obtaining complex molecular structures for pharmaceutical chemistry and material science.

The invention belongs to the technical field of battery preparation, and particularly relates to a double-monatomic redox catalyst and a preparation method and application thereof. The double-monatomic redox catalyst is prepared by compounding the RMF polymer and the ZIF-8, so that structural collapse and metal agglomeration in a pyrolysis process are effectively prevented, and high dispersion of metal diatoms containing Fe atoms is realized. On the basis, the oxidation-reduction catalyst shows excellent ORR activity in both acidic and alkaline media, the half-wave potential in the acidic medium can reach 0.728 V, and the half-wave potential in the alkaline medium can reach 0.788 V.

An integrated waste gas treatment system includes an adsorption / desorption device that receives a waste gas that includes an organic compound and an organic nitrogen compound exhausted from a semiconductor manufacturing facility, where the adsorption / desorption device adsorbs the organic compound and the organic nitrogen compound and concentrates and desorbs the organic compound and the organic nitrogen compound, and a catalytic decomposition device disposed adjacent to the adsorption / desorption device, where the catalytic decomposition device includes a catalytic chamber that provides a gas passage through which a gas desorbed from the adsorption / desorption device flows and an oxidation-reduction catalyst disposed in the gas passage that removes the organic compound and the organic nitrogen compound from the desorbed gas. The organic compound and the organic nitrogen compound are subjected to an oxidation treatment by the oxidation-reduction catalyst, and nitrogen oxides generated by the oxidation treatment are removed by a selective reduction reaction.

An electrosynthetic cell and its use are disclosed. The electrosynthetic cell can be used in a reductive electrosynthesis of one or more desired chemical products from one or more chemical reactants. The electrosynthetic cell comprises a hydrogen anode half-cell and a cathode half-cell. The hydrogen anode half-cell comprises hydrogen (H2), a first liquid phase solution that is in contact with an anode and a heterogeneous redox catalyst capable of catalyzing the oxidation of H2 to H+, and a redox mediator capable of transferring or accepting electrons and / or protons while undergoing reduction or oxidation. The cathode half-cell comprises a second liquid phase solution comprising the one or more chemical reactants that is in contact with a cathode and a reductive synthesis catalyst capable of catalyzing the reductive synthesis of the one or more desired chemical products from the one or more chemical reactants.

The invention relates to a metal surface treatment technology, in particular to an environment-friendly titanium alloy oxide skin removing chemical liquid medicine which comprises the following raw materials in percentage by mass: 10-30% of alkaline substance, 10-30% of solvent and the balance of water. The dosage of the metal ion chelating agent is 5%-10%; 0.1%-2% of a redox catalytic medium; 0.5-5% of a metal corrosion inhibitor; 5-15% of an accelerant; 0.5%-2% of a penetrant; and the balance of deionized water is supplemented. The environment-friendly titanium alloy oxide skin removing chemical liquid medicine can efficiently remove surface oxide skin and meanwhile is high in titanium alloy base material protection performance.

The invention belongs to the technical field of tail gas treatment. The after-treatment system of the ammonia diesel engine comprises a selective reduction (SCR) catalyst, an ammonia oxidation reduction catalyst (ASC) and an ammonia decomposition catalyst (ADC) arranged at the tail end in the tail gas flow direction. According to the method, treatment can be carried out according to the characteristic that tail gas of the ammonia diesel engine contains high-concentration NH3, the conversion efficiency of NOx and NH3 is improved, and the content of NOx and NH3 in the tail gas of the ammonia diesel engine is greatly reduced.

The present invention discloses a catalyst for the oxidative dehydrogenation of light alkanes to ethylene, its preparation method and application, belonging to the technical field of redox catalysts; the catalyst is composed of an active component, a co-active component and a carrier; wherein, the active component is a perovskite-like metal oxide SrCoO 3‑x , the co-active components are oxides of Ba, Mn and P, and the carrier is alumina or silica; the catalyst prepared by the present invention has high ethylene selectivity and activity stability, and the unique lattice oxygen type of SrCoO 3‑x guarantees the selectivity of ethylene; the introduced Ba and Mn oxides increase the ethane conversion rate and further improve the ethylene selectivity, and the introduced P oxide increases the activity stability of the catalyst.

The invention discloses a method for synthesizing selenocyclopentene by electrochemical catalysis of cyclization reaction of terminal alkyne, acrylate and diselenide [3 + 2], and belongs to the technical field of organic synthesis.The method comprises the steps that the terminal alkyne, allyl dimethyl ester and diselenide serve as raw materials, cheap ferrocene serves as a redox catalyst under the electrochemical condition, and the selenocyclopentene is synthesized through the cyclization reaction of the terminal alkyne, the acrylate and the diselenide [3 + 2]; the selenium-containing cyclopentene skeleton is efficiently constructed. According to the method for synthesizing selenocyclopentene through the cyclization reaction of terminal alkyne, acrylate and diselenide [3 + 2] through electrochemical catalysis, the reaction condition is mild, no additional oxidizing agent is needed, the substrate applicability is wide, the functional group compatibility is good, and the target product can be obtained with the medium to excellent yield.

A method for the synthesis of two-dimensional (2D) bismuth (bismuthene) and a use of this material as a photoredox catalyst are provided. The 2D bismuthene is prepared by a liquid-phase exfoliation of the 3D-layered bismuth. The photoredox catalyst is used for the C-H functionalization reactions for the synthesis of complex molecules under versatile conditions.

The invention relates to a reactive adhesive tape and the use of the adhesive tape for bonding components in electronic, optical or precision mechanical devices, automobiles, medical devices and dental devices. The reactive adhesive tape comprises at least one reactively curable adhesive layer containing a) one or more polymers, and b) at least one first radically polymerizable (meth)acrylate compound, and c) at least one initiator and / or d) at least one redox catalyst, and is characterized in that the at least one first radically polymerizable (meth)acrylate compound is a monomer or oligomer having at least one nitrogen-containing group selected from amide, urethane and urea and the at least one first radically polymerizable (meth)acrylate compound has a melting point of greater than 45 °C and / or a molecular weight of more than 300 g / mol.

The present disclosure provides a method for producing a fluoroether, with which it is possible to easily produce fluoroethers having various structures.　A method for producing a fluoroether according to the present disclosure comprises a step 1 for obtaining a fluoroether by reacting an alkene represented by formula (1): CR1R2=CX1X2 (wherein X1 and X2 may be the same as or different from each other and each represent a hydrogen atom or a halogen atom; and R1 and R2 may be the same as or different from each other and each represent a hydrogen atom, an aryl group or alkyl group which may have a substituent, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkynyl group which may have a substituent, a fluoroalkyl group which may have a substituent, a halogen atom, or a group represented by R-(CH2)n- (wherein R is an aryl group which may have a substituent; and n is an integer of 3 or more)) with an N-fluoroalkoxy compound in the presence of an oxidation-reduction catalyst and a nucleophilic agent.

This invention discloses a method for synthesizing itaconic acid compounds. The method directly uses allyl ester compounds as raw materials, selects oxalic acid compounds or oxalate amine compounds as acylation reagents, uses triphenylphosphine as an additive, and employs metal-free 3,6,-di-tert-butyl-9-mesethyl-10-phenylacridine-10-tetrafluoroborate as a photo-redox catalyst. Under the catalysis of this organic photo-redox catalyst, corresponding acyl radicals and allyl radicals are generated, respectively. Through radical cross-coupling, itaconic acid compounds are finally obtained. This method has a wide range of applicable substrates, low preparation cost, and simple steps. It is convenient to operate, environmentally friendly, exhibits excellent stereoselectivity, and tolerates a broad spectrum of functional groups.

The invention discloses a silverware surface oxide reducing agent as well as a preparation method and application thereof. The silverware surface oxide reducing agent comprises the following components in parts by weight: 65-89 parts of deionized water, 1-5 parts of tea extract, 2-10 parts of roxburgh rose extract and 0.01-0.05 part of colloidal platinum. According to the reducing agent, dissolved hydrogen molecules, tea extract, roxburgh rose extract and other reducing components are utilized to perform in-situ reduction on potassium chloroplatinate to obtain colloidal platinum, and the defect of difficult dispersion of added nano platinum and other catalysts is avoided. Substances such as silver oxide in color spots on the surface of silverware are solid phases and are difficult to directly reduce by hydrogen, tea polyphenol and an ascorbic acid aqueous solution, and the reducing agent utilizes colloidal platinum as a redox catalyst to adsorb and catalyze reduction components such as hydrogen molecules, tea polyphenol in a tea extract and ascorbic acid in a roxburgh rose extract to oxidize, so that the color spots on the surface of the silverware are reduced. And meanwhile, the released electrons can reduce oxides such as silver oxide in color spots on the surface of the silverware into elemental silver, so that the oxides on the surface of the silverware are effectively reduced.

The present invention relates to a photocurable, reactive, pressure-sensitive adhesive film. The adhesive film according to the invention makes it possible to achieve structural bond strengths. The adhesive film comprises (a) at least one free-radically polymerizable compound, and (b) at least one free-radical initiator, and (c) at least one photoredox catalyst, and (d) at least one carbon black. The adhesive film has improved storage stability after exposure to ambient light compared to the prior art.

An integrated waste gas treatment system includes an adsorption / desorption device that receives a waste gas that includes an organic compound and an organic nitrogen compound exhausted from a semiconductor manufacturing facility, where the adsorption / desorption device adsorbs the organic compound and the organic nitrogen compound and concentrates and desorbs the organic compound and the organic nitrogen compound, and a catalytic decomposition device disposed adjacent to the adsorption / desorption device, where the catalytic decomposition device includes a catalytic chamber that provides a gas passage through which a gas desorbed from the adsorption / desorption device flows and an oxidation-reduction catalyst disposed in the gas passage that removes the organic compound and the organic nitrogen compound from the desorbed gas. The organic compound and the organic nitrogen compound are subjected to an oxidation treatment by the oxidation-reduction catalyst, and nitrogen oxides generated by the oxidation treatment are removed by a selective reduction reaction.

The present invention relates to a light-curable, reactive, pressure-sensitive adhesive film based on an acrylate- and / or methacrylate-functionalised polyurethane, the curing of which is initiated by blue LED light or UV LED light, and which cures sufficiently slowly so that, if required, for example if non-transparent substrates are to be bonded, the parts to be bonded can be joined with a certain time delay after initiation, and which continues to cure even in the dark after bonding. High bond strengths can be achieved with the adhesive film according to the invention. The adhesive film comprises (a) at least one acrylate- and / or methacrylate-functionalised polyurethane, (b) at least one initiator, in particular a radical initiator, and (c) at least one photoredox catalyst. Reactive monomers are not required.

The invention discloses a CFNB metal-free redox catalyst and a preparation method and application thereof, and belongs to the technical field of electrochemical catalytic materials, the CFNB metal-free redox catalyst is composed of a carbon material co-doped with three heterogeneous elements of fluorine, nitrogen and boron, and has a three-dimensional cross-linked nano network structure; the preparation method comprises the following steps: jointly dissolving the polyalcohol ether borate, the polydopamine and the polyvinylidene fluoride hexafluoropropylene copolymer in N-N dimethylformamide according to a mass ratio of (1-5): (1-5): (1-5), and stirring until the materials are uniformly mixed; the obtained mixed solution is subjected to electrostatic spinning, the spinning voltage is 12-18 kV, the receiving distance is 15-20 cm, the flow velocity is 0.05-5 mL / h, and an aluminum foil serves as a receiving base material; the obtained spinning product is subjected to carbonization treatment in an inert atmosphere, calcination is conducted for 1-4 h at the calcination temperature of 700-950 DEG C, and the CFNB metal-free oxygen reduction catalyst is obtained and has better catalytic activity and stability.

The invention relates to a reactive adhesive tape and the use of the adhesive tape for bonding components in electronic, optical or precision mechanical devices, automotive, medical and dental devices. The invention relates to a reactive adhesive tape comprising at least one reactively curable adhesive layer comprising a) one or more polymers, and b) at least one first radically polymerizable (meth) acrylate compound, and c) at least one initiator and / or d) at least one redox catalyst, and characterized in that the reactive adhesive tape comprises at least one reactive curable adhesive layer comprising a) one or more polymers, and b) at least one first radically polymerizable (meth) acrylate compound, and c) at least one initiator and / or d) at least one redox catalyst. The at least one first radically polymerizable (meth) acrylate compound is a monomer or oligomer having at least one nitrogen-containing group selected from the group consisting of amides, carbamates and ureas, and the at least one first radically polymerizable (meth) acrylate compound has a melting point greater than 45 DEG C and / or a molar mass greater than 300 g / mol.

To realize an oxygen reduction catalyst that exhibits high catalytic activity and durability.SOLUTION: An oxygen reduction catalyst includes a substrate 110 that is an aggregate of tin oxide-based crystal particles 111, and platinum particles 120 supported on the substrate 110. The substrate 110 includes tin oxide-based crystal particles 111 that has flat crystal faces with a side length of 2 nm or more as determined from a bright-field image of a (scanning) transmission electron microscope, and whose crystallite size determined by the X-ray diffraction method is 3 nm or more and 20 nm or less. At least some of the platinum particles 120 supported on the substrate 110 form linked structures 125 in which three or more particles are linked linearly as determined from a dark-field image of the (scanning) transmission electron microscope.SELECTED DRAWING: Figure 1

The invention discloses a preparation method of a graded porous iron-nitrogen co-doped carbon-oxygen reduction electrocatalyst, and relates to the technical field of catalyst preparation. The invention aims to solve the technical problems of slow cathode kinetics and high cost of the current redox catalyst. The method comprises the following steps: 1, preparing an NHPC oxygen reduction electrocatalyst; and 2, preparing the FeNC oxygen reduction electrocatalyst. By adopting a confinement adsorption method, the catalyst with excellent activity, good stability and methanol resistance can be controllably prepared. The prepared graded porous iron-nitrogen co-doped carbon-oxygen reduction electrocatalyst is used in an energy conversion device.

This invention relates to the field of fluorescent compound preparation technology, and discloses a method for synthesizing naphtho[1',2'4,5]imidazo[1,2-a]pyridine fluorescent compounds, including a cyclized compound, wherein the cyclized compound includes styrene compounds and imidazolium heterocyclic compounds, and the cyclized compound is a naphtho[1',2'4,5]imidazo[1,2-a]pyridine fluorescent compound; it also includes a method for synthesizing naphtho[1',2'4,5]imidazo[1,2-a]pyridine fluorescent compounds. This invention utilizes a synergistic combination of a photo-redox catalyst and a cobalt oxime catalyst to achieve a [4+2] cyclization reaction of olefins with imidazopyridines. Under photochemical conditions, imidazopyridine compounds and styrene compounds undergo a [4+2] cyclization reaction with the addition of the photo-redox catalyst and the cobalt oxime catalyst. This facilitates the rapid synthesis of naphtho[1',2'4,5]imidazo[1,2-a]pyridine fluorescent compounds. It avoids the use of precious metal catalysts or chemical oxidants, and the reaction conditions are mild, making it suitable for the mass production and processing of naphtho[1',2'4,5]imidazo[1,2-a]pyridine fluorescent compounds, reducing synthesis and production conditions, saving costs, and improving efficiency.

The invention relates to a reactive adhesive tape, to a reactive adhesive tape system, to a bonded assembly, to a method for electrically debonding the bonded assembly and to the use of the adhesive tape or adhesive tape system for bonding components in electronic, optical or precision-mechanical devices, motor vehicles, medical devices and dental devices. The reactive adhesive tape comprises at least one reactive-curing adhesive compound layer D containing a base compound, the base compound containing a) one or more polymers, and b) one or more radically polymerizable monomers and / or oligomers, and c) at least one initiator and / or d) at least one redox catalyst, and the reactive-curing adhesive compound D containing additionally e) at least one electrolyte.

This disclosure provides a method for producing fluorine-containing aromatic compounds. [Solution] A method for producing a fluorine-containing aromatic compound, comprising the step of obtaining a product by reacting an N-fluoroalkoxy compound with an aromatic compound in the presence of a redox catalyst, The N-fluoroalkoxy compound is a compound having an N-ORf moiety (Rf represents a fluoroalkyl group with 3 or more carbon atoms), and the product is - An aromatic fluoroether compound (E1) having an ORf moiety, Aromatic compounds (E2) having an -Rf' moiety (where Rf' represents a fluoroalkyl group obtained by removing one carbon atom from Rf). It contains at least one fluorine-containing aromatic compound selected from the group consisting of the following.

The invention discloses synthesis of a composite metal oxide type redox catalyst and application of the composite metal oxide type redox catalyst in chemical-looping ammonia synthesis reaction. The invention relates to a preparation method of a chemical-looping ammonia synthesis catalyst and application of the catalyst in chemical-looping ammonia synthesis. When the catalyst is used for catalyzing the chemical-looping ammonia synthesis reaction, the chemical-looping circular reaction can be realized, the energy consumption required by the reaction can be reduced, the ammonia can be synthesized under mild conditions, and the catalyst can still keep good catalytic activity after being regenerated. The catalyst is rich in raw material source, low in carrier price and easy to prepare, has relatively good development potential and has a very good application prospect in the aspect of catalyzing chemical-looping synthesis of ammonia.

The present invention provides novel redox catalysts and processes using the redox catalyst for the oxidative dehydrogenation of alkylaromatics. The catalyst enables the dehydrogenation reaction to produce an alkenylaromatic and hydrogen, the selective hydrogen combustion reaction of lattice oxygen with the hydrogen to produce steam, and carbon monoxide / dioxide (COx) management by mitigating COx production, capturing the COx, and / or or otherwise providing COx resistance.

This disclosure provides a method for producing fluorine-containing aromatic compounds. [Solution] A method for producing a fluorine-containing aromatic compound, comprising the step of obtaining a product by reacting an N-fluoroalkoxy compound with an aromatic compound in the presence of a redox catalyst, The N-fluoroalkoxy compound is a compound having an N-ORf moiety (Rf represents a fluoroalkyl group with 3 or more carbon atoms), and the product is - An aromatic fluoroether compound (E1) having an ORf moiety, Aromatic compounds (E2) having an -Rf' moiety (where Rf' represents a fluoroalkyl group obtained by removing one carbon atom from Rf). It contains at least one fluorine-containing aromatic compound selected from the group consisting of the following.

The present disclosure provides a fluorine-containing aromatic compound production method.　This fluorine-containing aromatic compound production method comprises a step for reacting an N-fluoroalkoxy compound and an aromatic compound in the presence of an oxidation-reduction catalyst to obtain a product. The N-fluoroalkoxy compound is a compound having an N-ORf moiety (Rf represents a fluoroalkyl group having 3 or more carbon atoms). The product includes at least one fluorine-containing aromatic compound selected from the group consisting of aromatic fluoroether compounds (E1) having an -ORf moiety, and aromatic compounds (E2) having an -Rf' moiety (Rf' represents a fluoroalkyl group obtained by removing one carbon atom from Rf).

The present invention relates to a light-curing, reactive, pressure-sensitive adhesive film. Structural bond strengths can be achieved with the adhesive film according to the invention. The adhesive film includes (a) at least one radically polymerizable compound, and (b) at least one radical initiator, and (c) at least one photoredox catalyst, and (d) at least one soot. The adhesive film is characterized by improved storage stability after exposure to ambient light compared to the state of the art.

A two-part adhesive composition composed of at least a first agent, which comprises a compound having one or more (meth)acryloyl groups in the molecule and an organic peroxide, and a second agent, which includes a reducing agent that forms a redox catalyst system with the organic peroxide, wherein the first agent or the second agent contains an ionic liquid.