86results about "Catalytic reactions" patented technology

The present disclosure provides a supported copper-based single-atom catalyst and a preparation method and use thereof, belonging to the technical field of environmental catalysis. The preparation method includes the following steps: dispersing an organic ligand and a copper powder in acetonitrile, and conducting refluxing in a constant-temperature water bath to obtain a copper complex emulsion; conducting centrifugation and filtration on the copper complex emulsion in sequence to obtain a copper complex solution; mixing a support, the copper complex solution, and the acetonitrile, and conducting rotary evaporation on a resulting mixture to obtain a powder; and roasting the powder to obtain the supported copper-based single-atom catalyst. In the present disclosure, the copper powder is coordinated with the organic ligand and then supported on a surface of the support.

The application provides a method for carbon dioxide capture and hydrogenation synthesis of methanol based on a eutectic solvent, and belongs to the technical field of carbon capture and utilization. The method comprises the following steps: weighing acetyl guanidine and ethylene glycol according to a proportion, mixing the acetyl guanidine and the ethylene glycol, stirring to prepare a eutectic solvent at a given temperature, capturing carbon dioxide in flue gas by using the eutectic solvent to form a rich liquid, transferring the rich liquid into a high-pressure reaction kettle, adding a catalyst, filling in hydrogen, increasing the temperature to perform a carbon dioxide hydrogenation reaction, filtering to obtain a catalyst and a mixture of the eutectic solvent and methanol after the reaction, and performing flash evaporation on the mixture to obtain product methanol and regenerated eutectic solvent. After capturing carbon dioxide in the flue gas, the method directly performs in-situ carbon dioxide hydrogenation in the absorbent to prepare methanol, avoids problems such as high energy consumption of carbon dioxide desorption, high reaction temperature and low single-pass conversion rate in a traditional gas-solid phase reaction process, and has a simple process and easy regeneration of the eutectic solvent.

Various processes for preparing C4 aldoses and / or ketones thereof are described. Various processes are described for preparing C4 aldoses and / or ketones thereof from feed compositions comprising glycolaldehyde. Also, various processes for preparing useful downstream products and intermediates, such as erythritol and erythronic acid, from the C4 aldoses and / or ketones thereof are described.

The present disclosure relates to a process for converting unsaturated polyethylene into at least alkene products. The process includes contacting the unsaturated polyethylene with two or more catalyst components in a reactor containing an alkene reactant. The two or more catalyst components include a metathesis catalyst component and an isomerization catalyst component. By the contacting, at least a portion of the unsaturated polyethylene or a product derived therefrom undergoes a metathesis reaction and an isomerization reaction to produce an effluent containing at least alkene products.

The application discloses a polyethylene nanofiber supported gold-ion liquid catalyst for catalyzing acetylene hydrochlorination reaction and a preparation and application thereof. The polyethylene nanofiber supported gold-ion liquid catalyst comprises a carrier and a gold active component and an ion liquid supported on the carrier, and the carrier is polyethylene nanofiber. The application provides application of the polyethylene nanofiber supported gold-ion liquid catalyst in a reaction of catalyzing acetylene hydrochlorination to synthesize chloroethylene, solves the problems of reduction loss of high-valence Au and carbonization denaturation or even loss of the ion liquid caused by reaction heat of the supported Au-ion liquid system catalyst in the acetylene hydrochlorination reaction, and makes the catalyst have higher stability.

The application discloses a kind of photocontrol chiral ligand based on diarylethene, structural general formula is as shown in following formula:After the photocontrol chiral ligand based on diarylethene synthesized in the application and rhodium catalyst coordination, when catalyzing asymmetric carbon hydrogen amidation at room temperature, higher reaction yield and higher ee value can be obtained by using ligand in open loop state to catalyze, and lower reaction yield and lower ee value can be obtained by using ligand in light stable state to catalyze.The application makes up the deficiency that there is currently lack of photo-thermal bistable photocontrol catalyst in the field of photocontrol asymmetric catalysis, and widens the application of diarylethene in photocontrol asymmetric catalysis.

The present invention relates to the field of pesticide chemistry technology, and in particular, to a method for selectively and asymmetrically hydrogenating 4-substituted-1,2-dihydroquinoline and use thereof. The present invention discloses a selective, asymmetric hydrogenation reaction conducted on 4-substituted-1,2-dihydroquinoline in the presence of a chiral ligand and a rhodium catalyst. The selective, asymmetric hydrogenation method features ease to operate, a higher conversion rate, and higher enantioselectivity.

The present invention relates to a catalyst system comprising more than one catalyst network, wherein at least one of the catalyst networks contains at least one noble metal wire consisting of a binary PtRh alloy. The binary PtRh alloy consists of 3.4-4.6 wt. % of rhodium, impurities and the remainder platinum. The catalyst system does not comprise a catalyst network containing a noble metal wire made of a further binary PtRh alloy comprising more than 7 wt. % of rhodium. The invention also relates to a method for the catalytic oxidation of ammonia, in which a catalyst system according to the invention is used.

Frontal polymerization involves the propagation of a thermally driven polymerization wave through a monomer solution to rapidly generate high-performance polymeric materials with little energy input. The balance between latent catalyst activation and sufficient reactivity to sustain a front can be difficult to achieve and often results in systems with poor storage lives. This is of particular concern for frontal ring-opening metathesis polymerization (FROMP) where gelation occurs within a single day of resin preparation due to the highly reactive nature of Grubbs-type catalysts. The invention uses encapsulated catalysts to provide remarkable latency to frontal polymerization systems, with negligible differences in frontal velocities or thermomechanical properties of the resulting polymeric materials. FROMP systems with encapsulated catalyst particles are shown with storage lives exceeding eight months and front rates that increase over a two month period. Moreover, the generality of this encapsulation method is demonstrated by encapsulating a platinum catalyst for the frontal polymerization of silicones using hydrosilylation chemistries.

The application provides application of an ionic liquid in preparation of synthetic ester lubricating oil, the synthetic ester lubricating oil and a preparation method thereof, and belongs to the technical field of synthetic ester lubricating oil.In the application, the ionic liquid can be used as a catalyst and can also play the role of a lubricating oil additive; after the reaction of catalytically synthesizing ester lubricating oil is completed, the ionic liquid does not need to be separated, which not only helps to significantly improve the performance of the ester lubricating oil, makes the synergistic lubricating effect of the synthetic ester lubricating oil and the ionic liquid reach the extreme effect, solves the scientific and technical problem of the negative influence of the residual catalyst on the synthetic ester base oil which exists widely at present, but also omits the catalyst separation step, shortens the preparation procedure of the synthetic ester, is favorable for industrialized mass production and promotes wide application; the application of one thing for two purposes provides a new idea for green synthesis of the synthetic ester lubricating oil.

The present invention relates to a method for depleting a homogeneous catalyst system from an aqueous reaction phase and concentrating it into an organic phase, wherein the catalyst system is employed in the oxidation of an ethylenically unsaturated organic compound in a biphasic reaction mixture. Moreover, the present invention relates to a method for the oxidation of an ethylenically unsaturated organic compound, and biphasic mixtures as well as aqueous and organic phases obtained in such methods.

The application discloses a phosphorus heterocyclic [3,2,0] organic phosphorus compound and a preparation method and application thereof. A phosphorus heterocyclic [3,2,0] organic phosphorus compound containing two quaternary carbon centers is synthesized by using a phosphine oxygen compound containing a double allyl group and a phosphine sulfur compound as raw materials, using 10-phenyl phenothiazine as a photocatalyst, exciting the photocatalyst under a 390 nm light source to activate the double bond, realizing a high stereoselectivity [2+2] cycloaddition reaction, and separating diastereoisomers, wherein a single diastereoisomer product is as high as 97%, and the diastereoselectivity is excellent. The application provides a green reaction mode for synthesizing the phosphorus heterocyclic [3,2,0] organic phosphorus compound by photocatalysis, and the reaction condition is mild, and the substrate universality is good. The obtained phosphorus heterocyclic [3,2,0] organic phosphorus compound is applied to primary alcohol chlorination as a catalyst, and exhibits high reactivity, and compared with a reported catalytic system, the application has more excellent catalytic activity.

The present disclosure relates to tungsten complexes, catalyst systems including tungsten complexes, and polymerization processes to produce polycycloolefin polymers such as polycyclopentene polymers and polycyclooctene polymers.

A chiral bimetallic cooperative catalysis system containing a chelating ligand and use thereof in asymmetric synthesis of bedaquiline are provided. Specifically, in the chiral bimetallic cooperative catalysis system, an equilibrium constant of a reaction is increased by the chelating ligand formed by an achiral secondary amine and chiral lithium aminoalcohol, thereby promoting an addition reaction between 6-bromo-3-benzyl-2-methoxyquinoline (I) and 3-dimethylamino-1-naphthyl-1-propanone (II) to move forward. By means of the bimetallic cooperative catalysis system, the yield of the target product (1R,2S)-bedaquiline is obviously increased.

This invention discloses a method for the selective synthesis of 4-amino-N-(hetero)arylsulfonamide compounds. Using bipyridine as a ligand and nickel as a catalyst, and inexpensive and readily available low-activity (hetero)aryl chlorides and 4-aminobenzenesulfonamides as substrates, 1,8-diazabicycloundec-7-ene and other organic bases are used, along with sodium iodide and other additives. The synthesis of various 4-amino-N-(hetero)arylsulfonamide compounds is achieved through a photo-driven nickel-catalyzed selective C-N coupling reaction of (hetero)aryl chlorides and 4-aminobenzenesulfonamides under an argon atmosphere. This invention features a simple reaction system, convenient operation, mild reaction conditions, and simple post-processing. It exhibits good selectivity for target compounds and high yields, avoiding the problems of complex catalytic systems and poor functional group compatibility caused by the use of traditional expensive metal catalysts and inorganic bases. Therefore, it has significant application value and market prospects.

The present application relates to the field of organic chemistry, in particular to the use of silicon compounds in cyclization reactions, and provides a preparation method of 5-chloromethyl-2-trifluoromethyl-1,3,4-oxadiazole, which comprises: subjecting 1-(chloroacetyl)-2-(trifluoroacetyl)hydrazine to a cyclization reaction in the presence of a silicon compound and an amide compound to provide 5-chloromethyl-2-trifluoromethyl-1,3,4-oxadiazole. The silicon compound or / and the amide provided by the present application can be used as a cyclization reagent to efficiently perform cyclization synthesis, and has higher comprehensive benefits compared with other methods in the prior art.

The present invention relates to a method for continuously preparing an ester-based composition, the method increasing a preparation yield by optimizing pressure of a reactor as a process variable of each reactor of a reaction unit in which a plurality of reactors are connected in series.

The present invention discloses a composite oxide support, a supported catalyst, and hydrogenated nitrile butadiene rubber, as well as a process for their preparation and their use. The composite oxide support comprises SiO2 and a metal oxide of group IVB, wherein the metal oxide of group IVB is TiO2 and / or ZrO2, and the composite oxide support has such surface properties that three characteristic peaks in the infrared spectrum in the range of 610-720 cm⁻¹ are observed. -1 and three further characteristic peaks in the infrared spectrum in the range of 2840-2970 cm -1The composite oxide support of the present invention can significantly improve the dispersion of the active components on the surface of a catalyst and substantially enhance the hydrogenation activity of the catalyst. The supported catalyst of the present invention is used in combination with a homogeneous catalyst for the hydrogenation saturation of a high-molecular-weight polymer material at low temperature and low pressure, and the resulting high-molecular-weight polymer product (in particular, hydrogenated nitrile butadiene rubber) exhibits a high degree of hydrogenation. Furthermore, the supported catalyst of the present invention can be reused multiple times, thereby improving the recyclability of the catalyst and reducing manufacturing costs.

Wacker oxidation can be used as a signal transduction mechanism for the selective and sensitive detection of ethylene in air via chemiresistive sensing. Using this system, the senescence of lisianthus flowers and carnations can be monitored.

Ru-catalyzed domino hydroformylation / hydrogenation / esterification using phosphine ligands.

The present invention relates to a catalyst for cross-linking silicone rubber compositions. In particular, the present invention provides a composition for producing a silicone rubber composition, the composition comprising a catalyst which has at least two compounds that are different from each other and are selected independently from one another from metal salts of carboxylic acids. The present invention further provides a use of the catalyst according to the invention for cross-linking a silicone rubber composition, and a use of the composition according to the invention for producing a silicone rubber composition, in particular for use as a sealant, an adhesive or a coating agent.

Provided is a method for producing a compound represented by General Formula (I) through oxidative cleavage of a compound of Formula (II), which is a bicyclic tetrasubstituted olefin compound. This method is for producing a compound represented by General Formula (I), including a step of obtaining a compound represented by General Formula (I) through oxidative cleavage of a compound represented by General Formula (II) using an oxidant in the presence of an additive represented by General Formula (III). The definitions of Formula -A1- and Formula -A2- in Formulas (I) and (II) above and R, R1, R2, R3, R4, and R5 in Formula (III) above are as described in the specification.

The application belongs to the field of chemical synthesis and provides a method for constructing an axially chiral 1,3-diene-3-bromide skeleton of a compound containing or having the axially chiral 1,3-diene-3-bromide skeleton, wherein the method is to react a compound containing or having a non-chiral 1,3-diene skeleton with a chiral phosphate, an alkali metal carbonate and a bromination reagent. The obtained compound containing or having the axially chiral 1,3-diene-3-bromide skeleton has a good yield and ee value, and provides a new method for constructing the compound with the axially chiral skeleton.

The invention relates to a process for preparing, by hydroformylation, short-chain olefins, more particularly C2 to C5 olefins, in a reactor, wherein the catalyst system is heterogenized on a porous ceramic material support, and synthesis gas or carbon monoxide is conducted through the reactor during process downtimes.

The present invention relates to a microparticle platinum-maleimide resin complex comprising: a) a compound of Formula 1: where R is as defined herein; and b) a thermoplastic resin embedding the compound of Formula 1. The present invention addresses a need in the art by providing a microparticle platinum-maleimide resin complex that can be used to provide shelf-stable compositions cured rapidly by hydrosilylation.

Provided is a method for producing a compound represented by General Formula (I) through oxidative cleavage of a compound of Formula (II), which is a bicyclic tetrasubstituted olefin compound. This method is for producing a compound represented by General Formula (I), including a step of obtaining a compound represented by General Formula (I) through oxidative cleavage of a compound represented by General Formula (II) using an oxidant in the presence of a metal catalyst containing one or more metal elements selected from the group consisting of vanadium, iron, and molybdenum. In Formulas (I) and (II) above, Formula -A1- (wherein a former bonding hand means a bonding hand that is bonded to a carbon atom C1, and a latter bonding hand means a bonding hand that is bonded to a carbon atom C2) is an alkylene group with 2 or more and 6 or less of carbon atoms that is optionally substituted and that optionally further contains an ether bond, an ester bond, a secondary amino group, a thioether group, or a combination thereof, and Formula -A2- (wherein a former bonding hand means a bonding hand that is bonded to a carbon atom C1, and a latter bonding hand means a bonding hand that is bonded to a carbon atom C2) is an alkylene group with 4 or more and 10 or less of carbon atoms that is optionally substituted and that optionally further contains an ether bond, an ester bond, a secondary amino group, a thioether group, or a combination thereof.

Bleach catalysts comprise at least one metal ion coordinated to at least one ligand based upon a common structural element of (4,5-Dihydro-1,3-oxazol-2-yl)benzene and more preferably upon a o-(4,5-Dih

A catalyst system is disclosed. The catalyst system may include a pre-catalyst and a co-catalyst. The pre-catalyst includes one or more chromium compounds coordinated with a ligand. The co-catalyst includes one or more organoaluminum compounds, wherein: the ligand has a structure according to formula (I): (formula (I)). In formula (I), R1, R2, R3, and R4 are independently chosen from (C6–C60) aryl, optionally substituted with one or more RS, wherein RS is a (C1–C50) hydrocarbyl or a (C1–C50) heterohydrocarbyl. In formula (I), R5 is a (C9–C60) aryl or a (C4–C60) heteroaryl, optionally substituted with one or more RS, wherein RS is a (C1–C50) hydrocarbyl or a (C1–C50) heterohydrocarbyl, provided that R5 is not naphthyl or triptycenyl.

Provided is a method that is for producing an alcohol from an olefin compound with an improved selectivity and that enables a catalyst to be easily reused. This method for producing an alcohol comprises: reacting an olefin compound, carbon monoxide, and hydrogen molecules, using a group-9 transition metal complex as a catalyst, in an organic solvent containing at least 30 mol% of an amine compound having at least two nitrogen atoms that form a tertiary amine.