68 results about "Hydrogen transfer" patented technology

The invention provides a composite hydrogen transfer catalyst based on an MOFs material as well as a preparation method and application of the composite hydrogen transfer catalyst. The composite hydrogen transfer catalyst comprises the MOFs material loaded with an active metal component and solid alkali, the active metal component is selected from at least one of palladium, platinum, ruthenium, rhodium and nickel; the active metal component accounts for 0.5-5% of the mass of the catalyst; the MOFs material is selected from at least one of ZIF-8, MIL-101, UiO-66, HKUST-1 and MOF-5 (Metal Organic Frameworks); the solid alkali is selected from at least one of magnesium oxide, calcium oxide, hydroxyapatite and barium oxide. The catalyst provided by the invention has the advantages of high catalytic activity, good selectivity, strong stability, reusability and the like, can efficiently catalyze fatty alcohol to perform hydrogen transfer reaction under a lower-temperature reaction condition to prepare Guerbet alcohol, remarkably improves the yield and purity of a product, and reduces the reaction energy consumption and cost.

The application relates to a CuO-ZnO-ZrO2@CeO2 core-shell catalyst and a preparation method and application thereof in preparing methanol. The preparation method is as follows: copper nitrate and zinc nitrate are dissolved in deionized water to form a mixed solution, a precipitant is added, and hydrothermal reaction is carried out to obtain copper-zinc nanoscale dispersed particles; then the particles are dispersed in deionized water, a zirconium nitrate aqueous solution is added, and hydrothermal reaction is carried out to precipitate zirconium on the outer layer of the particles; then a cerium nitrate aqueous solution and a precipitant are added to the system, and hydrothermal reaction is carried out; after the reaction, the system is subjected to filtration, washing, drying, grinding and calcination to obtain the CuO-ZnO-ZrO2@CeO2 core-shell catalyst. In the application process, CO2 and H2 are used as raw materials, cyclohexanol is used as a solvent, hydrogenation reaction is carried out under the action of the core-shell catalyst at 190-210 DEG C, and methanol is prepared. The core-shell catalyst can be applied to hydrogen transfer hydrogenation for preparing methanol, and can exhibit excellent catalytic activity and stability and higher methanol selectivity.

The present invention primarily relates to a coordination complex obtained or obtainable by a process as defined herein and to a process for producing a coordination complex as defined herein. Moreover, the present invention relates to a coordination complex as defined herein. The present invention further relates to the use of a coordination complex obtained or obtainable according to the process as defined herein or of a coordination complex as defined herein as a catalyst. Finally, the present invention relates to a process, preferably a hydrogen transfer reaction, more preferably for the isomerization of a double bond in a substrate, as defined herein.

The invention provides a method for producing ethylene and propylene by catalytic conversion of a heavy raw material, which comprises the following steps: introducing a catalyst A containing a Y-type molecular sieve, a modified MSE structure molecular sieve and a modified ZSM-5 molecular sieve into a first reaction zone of a riser to react with the heavy raw material; the separated C4-C12 non-aromatic hydrocarbon component enters a fluidized bed reactor to react with a preheated catalyst B containing a modified MSE structure molecular sieve and a modified ZSM-5 molecular sieve, and a partial carbon deposition catalyst B which is reacted with the C4-C12 non-aromatic hydrocarbon component (light petroleum hydrocarbon) and forms slight carbon deposition is introduced into the middle part of a second reaction zone of the riser; a first oil agent mixture (an intermediate product of heavy raw oil cracking) is preferentially reacted with the catalyst B, so that the concentration of the catalyst B in the second reaction zone is improved, the hydrogen transfer activity of the catalyst in the second reaction zone is reduced, the generated propylene is prevented from further generating propane, the propylene selectivity is improved, the ethylene and propylene selectivity is improved, and the yield is high.

The invention relates to a fuel cell system with hydrogen separation and hydrogen regeneration capabilities. A fuel cell system including an electrochemical hydrogen pump (EHP) and a polymer electrolyte membrane fuel cell (PEMFC) is provided. The EHP includes a first membrane electrode assembly having a first electrolyte membrane, an anode, a cathode, and a bipolar plate, while the PEMFC includes a second membrane electrode assembly having similar components. The hydrogen gas generated by the EHP is supplied to the anode of the PEMFC for power generation. The system is characterized by high temperature operation, effective hydrogen transfer via a silica binder, and an optimized bipolar plate made of graphitic carbon having a low resistance and thermoset resin content. The system ensures efficient power generation with minimal hydrogen loss and operates without the need for additional mechanical or electrical auxiliary equipment components.

The invention provides a catalytic cracking method for highly producing ethylene and propylene from hydrocarbons, which comprises the following steps: (1) introducing preheated raw materials and water vapor from the lower part of a reactor, contacting with a catalyst and reacting to obtain a reaction oil agent; the reactor at least comprises two reaction zones, namely a first reaction zone and a second reaction zone from bottom to top, the average solid content of a catalyst in the first reaction zone is greater than 0.2, and the average solid content of a catalyst in the second reaction zone is less than 0.1; (2) carrying out gas-solid separation on the reaction oil agent to obtain a carbon deposit catalyst and oil gas; and separating the oil gas to obtain a product comprising ethylene and propylene. In the initial stage of the reaction, a dense-phase reaction zone is adopted to increase the contact between hydrocarbon molecules and the active center of the catalyst, so that the proportion of catalytic cracking reaction is remarkably increased, and the thermal cracking reaction degree is reduced; a dilute phase reaction zone is adopted at the reaction tail end, reconversion of generated ethylene and propylene is reduced, hydrogen transfer reaction and condensation reaction are reduced, and the yield ratio of diene / (methane + coke) is greatly increased.

The application discloses an electrochemical double hydrogenation three-cell system, which comprises a chemical cell, an anode cell, a cathode cell, an ion exchange film, a palladium film, and a power supply; the palladium film serves as an anode electrode, and a first nano-porous palladium alloy catalyst is coated on one side of the surface of the palladium film; a cathode electrode is arranged in the cathode cell, and the cathode electrode is a second nano-porous palladium alloy catalyst; the system generates adsorbed hydrogen by electro-oxidation of a second organic substrate in the anode cell on the surface of the palladium film through the anode electrode; the adsorbed hydrogen is transferred to the chemical cell through the characteristics of the palladium film body phase hydrogen transfer, and the hydrogenation of the organic substrate is realized on the surface of the first nano-porous palladium alloy catalyst; meanwhile, the cathode electrode generates adsorbed hydrogen by hydrolysis on the surface of the second nano-porous palladium alloy catalyst to realize the hydrogenation of the organic substrate, and finally the electrochemical double hydrogenation of the organic matter is realized; experimental results show that when the three-cell system is applied to organic hydrogenation, the faraday efficiency is as high as 200%, and meanwhile, the system has excellent stability and ultralow energy consumption.

This invention discloses a method, system, and application for producing linear α-olefins from waste high-density polyethylene (HDPE). The method includes: subjecting waste HDPE to a first pyrolysis treatment to obtain volatile gaseous substances; subjecting the volatile gaseous substances to a second pyrolysis treatment, separation treatment, and condensation treatment sequentially to obtain a product including linear α-olefins; wherein, by mass percentage, the waste HDPE comprises the following components: 80-90% HDPE, 5-10% polypropylene, 1-5% polystyrene, and 2-5% impurities. This invention employs a continuous two-stage pyrolysis process, significantly improving the heat and mass transfer efficiency of the pyrolysis process, greatly reducing secondary reactions, and enabling high-temperature-promoted hydrogen transfer reactions, thereby continuously and efficiently producing mixed linear α-olefin products. It has advantages such as a relatively simple preparation process and a relatively concentrated product distribution.

The invention discloses a method for preparing light aromatic hydrocarbon by catalytic pyrolysis of waste polypropylene plastics, which comprises the following steps: by taking a hollow ZSM-5 molecular sieve as a carrier, loading metal Ga by an ion exchange method, introducing Zr by an impregnation method to obtain a zirconium-gallium modified hollow ZSM-5 molecular sieve catalyst, and carrying out two-stage ex-situ reaction process, firstly, deeply depolymerizing the polypropylene plastics to obtain the light aromatic hydrocarbon. Macromolecular long-chain hydrocarbon is converted into micromolecular short-chain hydrocarbon, so that a more suitable reactant is provided for subsequent aromatization; then short-chain hydrocarbon is fully diffused in pore channels of the zirconium-gallium modified hollow ZSM-5 molecular sieve, and is subjected to hydrogen transfer and aromatization reaction under the synergistic effect of acidic sites of the molecular sieve. Meanwhile, the introduction of nitrogen or carbon dioxide atmosphere inhibits the generation of alkane by-products caused by hydrogen transfer to a certain extent, and further improves the selectivity of aromatic hydrocarbon.

The application discloses a polymer-coated mesoporous silica supported ruthenium catalyst and a preparation method and application thereof. The catalyst has a polymer-coated mesoporous silica inner core, wherein the surface of the silica inner core is grafted with triethoxysilane having an alkenyl group; the alkenyl group of the triethoxysilane serves as an active site; the polymer is formed by polymerization of a polymer monomer through the alkenyl group; and the catalyst is formed by further coordination of metal Ru. The particle size of the catalyst is between 400 nm and 600 nm. The supported ruthenium catalyst provided by the application can catalyze hydrogen transfer reduction of carbonyl compounds at a high yield (up to 99%) and high enantiomeric selectivity (up to 99%), can be recycled for 8 times through simple recovery, and is easy to be industrialized, and can reduce catalyst cost and pollution.

The application discloses a light hydrocarbon dehydrogenation and cracking synergic catalyst and a preparation method thereof. The catalyst contains the following components in percentage by weight: 30-70% of molecular sieve in dry basis; 5-10% of a first binder in dry basis; 0.2-6% of a metal compound in dry basis; 10-20% of a powder in dry basis; 5-10% of a second binder in dry basis; and 10-30% of clay in dry basis. The preparation method comprises the following steps: a. preparing a catalytic cracking catalyst; b. preparing a catalytic dehydrogenation catalyst; and c. spray granulation to prepare a microspherical catalyst product. The application has the beneficial effect of having a core-shell structure, which can maximize the dehydrogenation and cracking synergic catalytic effect, thereby maximizing the single-pass conversion rate, inhibiting hydrogen transfer, aromatization and other reactions, and achieving the purpose of improving the ethylene and propylene yield.

The application provides a catalytic cracking catalyst and a preparation method thereof. The catalytic cracking catalyst comprises, taking the weight of the catalytic cracking catalyst as 100%, 15-50% of rare earth ultra-stable Y type molecular sieve in dry basis, 10-60% of clay in dry basis, 1-4% of yttrium in oxide basis and 5-35% of binder in oxide basis; wherein the content of the rare earth in the rare earth ultra-stable Y type molecular sieve is not more than 3% in oxide basis, taking the weight of the catalytic cracking catalyst as 100%. The catalyst utilizes the characteristics of small cell and more mesopores of the low-content rare earth ultra-stable Y type molecular sieve, and yttrium is additionally added on the basis of the low-content rare earth ultra-stable Y type molecular sieve, so that the activity stability of the catalyst is better, the mass transfer, cracking reaction and selective hydrogen transfer reaction process are promoted, the selectivity of the catalytic cracking reaction is improved, and the coke formation is reduced while the content of olefin in gasoline is reduced.

The invention discloses a method for preparing aliphatic hydrocarbon through co-pyrolysis of a photovoltaic module laminated part waste ethylene-vinyl acetate copolymer and a waste polyolefin elastomer. Physical and chemical complementation and free radical synergy of the ethylene-vinyl acetate copolymer and the polyolefin elastomer in the pyrolysis process are utilized; compared with independent pyrolysis, hydrogen transfer and deoxidation in co-pyrolysis have a synergistic effect, so that the selectivity and yield of aliphatic hydrocarbon are improved, generation of acidic oxygen-containing components and aromatics caused by deacetic acid is remarkably reduced, a liquid product is mainly composed of aliphatic hydrocarbon, carbon chain distribution is directionally concentrated to a short chain range, and meanwhile, tail gas corrosivity and post-treatment load are reduced. The solid carbon generated in the reaction process has a certain microporous structure and can be used as an adsorbent, an electrode material or a carbon-based fertilizer carrier, so that clean treatment and resource utilization of organic components of the retired photovoltaic module are realized.

According to an aspect, there is provided an end fitting for reducing hydrogen transfer to a pressure tube of a nuclear reactor across a rolled joint. The end fitting includes a barrier disposed along at least a portion of an internal diameter of the end fitting configured to contact coolant. According to an aspect, there is provided a method of reducing the transfer of hydrogen to a pressure tube of a nuclear reactor across a rolled joint. The method includes providing an end fitting including a barrier disposed along at least a portion of an internal diameter of the end fitting configured to contact coolant, and burning fuel in a nuclear reactor.

The present invention primarily relates to a coordination complex obtained or obtainable by a process as defined herein and to a process for producing a coordination complex as defined herein. Moreover, the present invention relates to a coordination complex as defined herein. The present invention further relates to the use of a coordination complex obtained or obtainable according to the process as defined herein or of a coordination complex as defined herein as a catalyst. Finally, the present invention relates to a process, preferably a hydrogen transfer reaction, more preferably for the isomerization of a double bond in a substrate, as defined herein.

The invention provides a method for catalytic synthesis of aripiprazole by using a hydrogen transfer strategy, and the preparation method comprises the following steps: taking 7-hydroxy-3, 4-dihydro-2 (1H)-quinolinone as a starting material, and carrying out nucleophilic substitution type etherification reaction on the starting material and 4-bromo-1-butanol in an alkaline medium to generate a 7-(4-hydroxybutoxy)-3, 4-dihydro-2 (1H)-quinolinone intermediate; and then, by taking a ruthenium catalyst as a catalytic system, carrying out N-alkylation reaction on the intermediate and 1-(2, 3-dichlorophenyl) piperazine hydrochloride to finish the synthesis of the target compound aripiprazole. The method has the advantages of being short in technological process, high in atom utilization rate, high in yield, low in cost, environmentally friendly and the like.

This invention provides a method for the reductive synthesis of tetracaine via amination, belonging to the field of organic synthesis. Using methyl p-aminobenzoate and butyraldehyde as raw materials, and a borane complex as a hydrogen transfer reagent, this invention synthesizes the medical anesthetic tetracaine via reductive amination. The main advantages of this method are: no catalyst required, high yield, mild reaction conditions, short reaction time, and high overall yield. Therefore, the method provided by this invention offers an effective approach for the future synthesis of tetracaine.

This invention discloses a 4-(formaldehyde oxime)-fluoro-2-quinolinone compound and its synthetic method, belonging to the fields of organic synthetic chemistry and medicinal chemistry. Using halogen-containing fluoro-N-(2-vinylphenyl)acetamide compounds as starting materials, this invention utilizes a visible light-induced tandem cyclization reaction to obtain 4-(formaldehyde oxime)-fluoro-2-quinolinone compounds in high yield. This invention employs greener and cleaner visible light as an energy source and uses inexpensive and readily available tert-butyl nitrite and trimethylamine borane as dual-role reagents (hydrogen transfer reagent and oxime source) and halogen atom transfer reagent, respectively, avoiding the use of expensive transition metal catalysts. The raw materials are simple and readily available, the process is environmentally friendly, and the target product yield is high.

The application relates to the technical field of wave-absorbing materials and mineral material utilization, and discloses a method for improving high-temperature oxidation resistance of carbon fibers, which comprises the following steps: surface modification of pretreated attapulgite fibers by a modifier, then hydroxylation treatment of the carbon fibers by hydrogen peroxide to obtain carbon fibers with a large amount of hydroxyl groups on the surface and greatly increased activity, and then hydrogen transfer reaction of the modified attapulgite fibers and the hydroxylated carbon fibers to realize chemical compounding of the attapulgite fibers and the carbon fibers. The attapulgite can form a uniform, dense and stable coating layer on the surface of the carbon fibers, blocks the transmission channel of oxygen, and further improves the high-temperature oxidation resistance of the carbon fibers. The application uses natural attapulgite fibers as the coating material, adopts a simple chemical grafting method, has simple process, low material cost, avoids complicated process and use of a large amount of solvents, and realizes low-cost and green and environment-friendly preparation of the carbon fiber-attapulgite composite wave-absorbing material.

This invention belongs to the fields of pharmaceutical raw material preparation and compound preparation, specifically relating to a method for preparing calcium folinate. The method includes: irradiating folic acid in a solvent with low light intensity in the presence of a photocatalyst and hydrogen donor I to achieve a first-stage hydrogen transfer reduction; after the concentration of dihydrofolate in the system reaches its peak, adding hydrogen donor II for high-intensity irradiation to achieve a second-stage hydrogen transfer reduction; then stopping the irradiation and sequentially performing a formylation reaction and a calcium salt precipitation reaction to obtain calcium folinate. The method provided by this invention not only enables a one-pot reaction but also improves the yield of calcium folinate, showing broad application prospects.

The application discloses a kind of belonging to the field of organic synthesis, it is related to a kind of synthesis method of polysubstituted 1,3-butadiene compound.The polysubstituted 1,3-butadiene compound structural formula is as shown in formula I.The method involves decarboxylation hydrogen transfer under nitrogen protection, in the presence of tetra-triphenylphosphine palladium, phenol and R-BINAP, the GMDVs compound shown in formula (II).The method used in the application has the following advantages compared with traditional methods:1) high yield, good atom economy, excellent stereoselectivity;2) substrate has good universality, can be diversified synthesis to polysubstituted 1,3-butadiene compound;3) low catalyst consumption, raw material does not need complex pre-functionalization process, post-treatment is convenient and product is easy to separate and purify, easy to mass production.

The invention provides a hydrogen transfer reaction catalyst, a preparation method thereof and application of the hydrogen transfer reaction catalyst in preparation of epsilon-caprolactone. The structural formula of the hydrogen transfer reaction catalyst is shown in the specification, M is a central metal, and the central metal is any one selected from Ir, Pd, Rh, Ru, Mn, Fe, Co, Ni and Cu; x is 1, 2 or 3; r1 is selected from an alkyl substituent group or an aryl substituent group. The hydrogen transfer catalyst is applied to the preparation process of epsilon-caprolactone, an esterification reaction and a hydrogen transfer reaction are connected in series, the process is simple, operation is easy, the technology is mature, raw materials are cheap and easy to obtain, reagents with high dangerousness are not used, safety is high, a by-product is only water, environment friendliness is achieved, the solvent can be completely recycled, and the cost is low. And the separation of the epsilon-caprolactone with extremely high purity can be realized only through simple reduced pressure distillation.

The system filled with hydrogen absorbing alloy comprises a supply side medium circuit comprising a hydrogen supply side tank, an absorption side medium circuit comprising a hydrogen absorption side tank, and a hydrogen transfer pathway connecting the hydrogen supply side tank and the hydrogen absorption side tank. The absorption side medium circuit comprises a cooler for further cooling the medium. The cooling load of the cooler is controlled such that the heating load for the hydrogen supply side tank and the cooling load for the hydrogen absorption side tank are in a predetermined ratio.

The invention provides a hydrogen storage alloy filling system capable of stably transferring hydrogen from a hydrogen supply side tank to a hydrogen absorption side tank. A hydrogen storage alloy filling system (1) is provided with: a supply-side medium circuit (2) provided with a hydrogen supply-side tank (21); an absorption-side medium circuit (3) provided with a hydrogen absorption-side tank (31); and a hydrogen transfer path (4) that connects the hydrogen supply-side tank (21) and the hydrogen absorption-side tank (31). The absorption-side medium circuit (3) is provided with a cooler (36) for further cooling the medium. The amount of cooling by the cooler (36) is controlled so that the amount of heating to the hydrogen supply-side tank (21) and the amount of cooling to the hydrogen absorption-side tank (31) become a predetermined ratio.

The invention discloses a synthetic method of (R)-glabridin with high optical purity, and belongs to the technical field of organic synthesis. The synthesis method provided by the invention comprises the following steps: dissolving methyl-protected isoflavone in a solvent, and adding boron tribromide to carry out a protecting group removal reaction; then carrying out asymmetric hydrogen transfer reaction on a reaction product in an acid-base mixed solution under the action of a chiral ruthenium catalyst; and finally, in the presence of acid, carrying out dehydroxylation reaction on the reaction product and a silane reagent in a solvent to obtain the (R)-glabridin. The (R)-glabridin is efficiently synthesized with high selectivity through a simple three-step reaction, the total yield is high, the optical purity is excellent, the conditions are mild, the post-treatment method is simple, and the method is suitable for large-scale production.

The application discloses a kind of general method of constructing diatomic catalyst and CO2 hydrogenation methanol application, belong to carbon dioxide conversion application field.The catalyst of the present application is composed of diatomic center and photo-induced semiconductor oxide carrier, specifically by the homonuclear or heteronuclear second metal monatomic atom is directionally loaded to the side of first monatomic center using photo-induced adjacent deposition strategy to form diatomic center.There is strong synergistic catalysis between the adjacent diatomic sites in the catalyst, so it is beneficial to hydrogen transfer and intermediate species adsorption in the catalytic reaction process.The present application can realize the precise synthesis of different diatomic catalysts through photo-induced adjacent deposition strategy, and by adjusting the combination of metal monatomic atom to regulate its synergistic effect, thereby improving the catalytic performance of CO2 hydrogenation methanol, CO2 conversion rate>8.0%, methanol selectivity>80%.

A hydrogen storage alloy filling system is provided that can stably transfer hydrogen from a hydrogen supply tank to a hydrogen absorption tank. [Solution] A hydrogen storage alloy filling system 1 is provided with a supply-side medium circuit 2 equipped with a hydrogen supply-side tank 21, an absorption-side medium circuit 3 equipped with a hydrogen absorption-side tank 31, and a hydrogen transfer path 4 connecting the hydrogen supply-side tank 21 and the hydrogen absorption-side tank 31. The absorption-side medium circuit 3 is provided with a cooler 36 for further cooling the medium. The cooling amount of the cooler 36 is controlled so that the amount of heating for the hydrogen supply-side tank 21 and the amount of cooling for the hydrogen absorption-side tank 31 are in a predetermined ratio.

Provided in the present invention is a catalytic cracking method for producing more ethylene and propylene from hydrocarbons. The method comprises: S1, bringing a hydrocarbon raw material in contact with a catalyst in a reactor system to perform reaction, so as to obtain a reaction oil agent, wherein the reactor system at least comprises two reaction zones: a first reaction zone and a second reaction zone downstream the first reaction zone, the hydrocarbon raw material is introduced below or from the lower part of the first reaction zone, the volume proportion of a zone where the average solid content of the catalyst in the first reaction zone is greater than 0.2 is greater than 0.2 is 0.2-0.7 in the first reaction zone, and the average solid content of the catalyst in the second reaction zone is less than 0.1; S2, subjecting the reaction oil agent to gas-solid separation, so as to obtain a carbon deposit catalyst and oil and gas; and S3, regenerating the carbon deposit catalyst, and returning the obtained regenerated catalyst to the reactor for recycling. In the present invention, a high solid content of the catalyst is used in the initial stage of the reaction to increase the contact between hydrocarbon molecules and an active center of the catalyst, such that the proportion of the catalytic cracking reaction is significantly increased, and the degree of the thermal cracking reaction is reduced; and a relatively low solid content of the catalyst is used in the subsequent stage of the reaction, such that re-conversion of the generated ethylene and propylene is reduced, the hydrogen transfer reaction and condensation reaction are reduced, and the yield ratio of diene / (methane + coke) is greatly increased.