52 results about "Borohydride" patented technology

A full continuous-flow preparation method of (+)-biotin, including: subjecting a cyclic anhydride and a chiral biphenyl propylene glycol to asymmetric ring-opening reaction to produce a first intermediate, which undergoes selective reduction with a borohydride and cyclization with an inorganic mineral acid to produce (3aS, 6aR)-lactone; subjecting the (3aS, 6aR)-lactone and a sulfenylating reagent to sulfenylation to produce (3aS, 6aR)-thiolactone, which undergoes Fukuyama coupling with a zinc reagent in the presence of a palladium catalyst and elimination reaction in the presence of an inorganic mineral acid to produce an alkenyl valerate compound; subjecting the alkenyl valerate compound to reduction in the presence of a Pd / C catalyst to produce a valerate ester, which undergoes hydrolysis to produce a valeric acid salt; and subjecting the valeric acid salt to debenzylation in the presence of an inorganic mineral acid to produce the target product (+)-biotin.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a metal borohydride composite material, a preparation method thereof and a hydrogen storage material. The preparation method of the metal borohydride composite material comprises the following steps: preparing the boron-doped carbon-based carrier; the boron-doped carbon-based carrier is mixed with a metal source, a first boron source and a first solvent, hydrogen is added for a thermal reaction, metal borohydride is generated on the surface of the boron-doped carbon-based carrier in situ, and the metal borohydride composite material is obtained. According to the method, a boron-doped carbon-based carrier is prepared, boron and carbon in the boron-doped carbon-based carrier are inert elements, a chemically inert electron-deficient carrier is constructed, and metal cations in metal borohydride are induced to generate charge transfer to the carrier in the in-situ preparation process of the metal borohydride on the surface of the boron-doped carbon-based carrier. Molecular internal electron interaction of metal cations and borohydride anions is weakened, so that the thermodynamic stability of the metal borohydride is reduced.

The invention discloses a method for recovering polycarbonate plastic to obtain an amine high-temperature antioxidant, and belongs to the technical field of plastic recovery. Aromatic amine is used as a nitrogen source, hydroboron and formate are used as in-situ hydrogen donors, and in an inert atmosphere and a heating environment, under the synergistic catalysis of a catalyst and a molecular sieve, the amine high-temperature antioxidant is prepared from polycarbonate based on a one-step method. The reaction path is simple, the selectivity is high, the amine high-temperature antioxidant taking diphenylamine and alkyl diphenylamine as main components can be directly obtained without multi-stage separation and intermediate preparation, and the requirements of simple process flow, low energy consumption and the like are met. The invention provides a high-valued way for polycarbonate recovery, also provides a large-scale raw material source for the field of high-temperature-resistant antioxidants for lubricating oil / fuel / rubber and high polymer materials, and has a wide application prospect.

The invention belongs to the technical field of hydrogen storage materials, and particularly relates to a metal borohydride composite material, a preparation method thereof and a hydrogen storage material. The preparation method comprises the following steps: activating the carbon-based carrier by adopting an alkaline substance; performing gas-phase fluorination treatment on the activated carbon-based carrier; the carbon fluoride-based carrier is mixed with a metal source, a boron source and a solvent, a solvothermal reaction is driven by hydrogen, metal borohydride is synthesized in situ on the surface of the carbon fluoride-based carrier, metal atoms in the generated metal borohydride react with F atoms in the carbon fluoride-based carrier to form a metal-F bridging phase, and meanwhile, the metal borohydride generates metal vacancies. The metal affinity of fluorine in the carbon fluoride-based carrier is utilized to induce nucleation loading of the metal borohydride in the synthesis process of the metal borohydride, and meanwhile, an interface chemical reaction is carried out to generate vacancies and bridging phases. Vacancies weaken B-H bonds, the hydrogen absorption and desorption heat / dynamics of the material are improved, and the bridging phase improves the structural stability and hydrogen absorption and desorption cycle performance of the material.

The invention relates to a process for preparing a star copolymer of 1,3-diene and ethylene, the copolymer containing more than 50 mole percent ethylene units. The process comprises the polymerization of a monomeric mixture of 1,3-diene and ethylene in the presence of a catalytic system based on at least one neodymocene borohydride metallocene and an organomagnesium cocatalyst, followed by the reaction of tin tetrachloride with the polymerization reaction product, and then a chain-terminating reaction. The invention also relates to a star copolymer obtainable by the process according to the invention.

The application discloses a borohydride / graphyne composite hydrogen storage material, a preparation method thereof and application of the borohydride / graphyne composite hydrogen storage material in the field of hydrogen storage. The borohydride / graphyne composite hydrogen storage material comprises a graphyne carrier and borohydride loaded on the carrier. The preparation method comprises the following steps: adding the graphyne into a homogeneous solution of the borohydride and performing ultrasonic dispersion, then removing part of the solvent in a state of keeping the graphyne suspended to form a paste, and finally removing the solvent by vacuumizing to obtain the borohydride / graphyne composite hydrogen storage material. The graphyne is used as the carrier, so that the stability of the borohydride in the hydrogen absorption and release cycle can be ensured. The borohydride / graphyne composite hydrogen storage material has low hydrogen release initial and peak temperatures, good hydrogen absorption and release kinetic performance and high hydrogen absorption and release reversibility.

The application belongs to the technical field of luminescent materials, and particularly relates to a cerium ion doped borohydride-based cesium halide anti-perovskite and a preparation method and application thereof. The cerium ion doped borohydride-based cesium halide anti-perovskite provided by the application has a structure of Cs3Cl[B 12 H 12 ]:Ce 3+ . The cerium ion doped borohydride-based cesium halide anti-perovskite is non-toxic, stable and has high luminous efficiency.

The present specification relates to a flying body provided with a fuel cell for generating hydrogen using sodium borohydride, which is one kind of tetrahydroborate, and generating power using the hydrogen, and provides a technique for reducing the weight of a power generation device. A flying object disclosed in the present specification is provided with: an SBH container for storing sodium borohydride (SBH) that generates hydrogen when mixed with water; a water container for storing water mixed with the SBH; and a fuel cell stack that generates power using the hydrogen generated by the SBH. The outer wall of the flying body is also used as a part of the SBH container and a part of the water container. The water container is arranged above the SBH container, a bottom plate of the water container also serves as a top plate of the SBH container, and a valve is arranged on the bottom plate. In the technology disclosed in the present specification, the outer wall of the flying body also serves as part of an SBH container and part of a water container. With this configuration, a part of the power generation device can be reduced in weight.

The invention relates to a catalytic system based on at least one neodymocene borohydride, a co-catalyst which is a dialkylmagnesium compound of formula RB-Mg-RL, in which RB is a secondary alkyl of formula R2CH and RL is a primary alkyl of formula RCH2, the Rs, identical or different, being alkyls. The catalytic system addresses the objective of improved macrostructure control in a polymerization process of ethylene or a monomer mixture containing ethylene and a 1,3-diene.

The invention provides a gold shell coated long-afterglow nano material for imaging photo-thermal and preparation and application of the gold shell coated long-afterglow nano material. The nano material comprises a Cr-doped zinc-gallium-germanium oxide long afterglow nano core, a mesoporous silica shell layer coated on the surface of the nano core and a gold shell layer coated on the outer surface of the mesoporous silica shell layer. The preparation method comprises the following steps: performing hydrothermal reaction and calcining to prepare a long afterglow nano core; the preparation method comprises the following steps: carrying out hydrolytic polycondensation on tetraethoxysilane (TEOS) under a cetyl trimethyl ammonium bromide (CTAB) template and an alkaline condition to form a mesoporous silica shell layer, removing the template and carrying out amination; adsorbing gold ions on the aminated surface, reducing the gold ions by using hydroboron to form gold seeds, and promoting growth by using hydroxylamine salt in a gold precursor solution containing carbonate to form a gold shell layer; the obtained nano material has near-infrared long-afterglow luminescence capability, generates photo-thermal temperature rise under 808 nm laser irradiation, and can be used for bacterial imaging and photo-thermal treatment of bacterial samples.

The invention relates to the technical field of batteries, in particular to a composite solid-state electrolyte membrane which comprises a halide solid-state electrolyte layer, a first solid-state electrolyte layer and a sulfide solid-state electrolyte layer arranged between the halide solid-state electrolyte layer and the first solid-state electrolyte layer. The first solid electrolyte layer comprises a first solid electrolyte, and the first solid electrolyte comprises a borohydride solid electrolyte and / or a carbon borohydride solid electrolyte. The electrochemical stability and the ionic conductivity of the composite solid electrolyte membrane can be improved, and the cycle performance and the rate capability of the battery can be improved.

The application discloses a method for predicting catalytic strength of transition metal on borohydride, comprising: constructing a model of metal and a model of BH4 group, setting parameters related to the model, performing structure optimization calculation on the constructed model, obtaining work functions (W f ) of surfaces of nine transition metals as indexes of inherent properties of the transition metals, marking catalytic strength of different 4d transition metals on BH4, and obtaining predicted catalytic strength by using a data analysis method. The method can realize efficient prediction and selection of a suitable borohydride metal catalyst, reduce prediction cost, has good practicability, and provides a new insight into catalytic performance of transition metal on borohydride.

The invention discloses a preparation method of a nucleotide monomer, which comprises the following steps: taking methyl-D-ribofuranoside as an initial raw material, and finally realizing the synthesis of a compound monomer as shown in a formula P through the steps of selective protection, selective deprotection, C-C bond construction, acylating chlorination reaction, basic group introduction through glycosylation, deprotection, hydroboration oxidation and ring closing in sequence. By providing a brand new synthesis method, the reaction yield is improved, the cost of the whole synthesis molecule is reduced, the binding affinity of the prepared target nucleoside monomer serving as a reported drug applied to HCV resistance to RNA can be improved so as to further improve nuclease resistance, and the method has great significance for subsequent nucleic acid drug research.

The application provides a kind of imaging photothermal gold shell coated long afterglow nanomaterial and its preparation and application.The nanomaterial includes Cr doped zinc-gallium-germanium oxide long afterglow nanometer core, mesoporous silica shell layer coated on the surface of the nanometer core and gold shell layer coated on the outer surface of the mesoporous silica shell layer.The preparation method includes: hydrothermal reaction and calcination to prepare long afterglow nanometer core;Under the condition of alkali, make tetraethyl orthosilicate (TEOS) hydrolysis and condensation to form mesoporous silica shell layer, remove template and carry out amination under cetyltrimethylammonium bromide (CTAB) template;Gold ions are adsorbed on the aminated surface and reduced to form gold seeds using borohydride, and gold shell layer is formed by promoting growth using hydroxylamine salt in a gold precursor solution containing carbonate.The obtained nanomaterial has near-infrared long afterglow luminescence capability, and generates photothermal heating under 808 nm laser irradiation, which can be used for bacterial imaging and photothermal treatment of bacterial samples.

A method of producing hydrogen gas that includes contacting a catalytic MnO2 / MgO / CuO / g-C3N4 nanocomposite with a solution including water and a borohydride source. The catalytic MnO2 / MgO / CuO / g-C3N4 nanocomposite includes 5 to 15 wt. % MgO nanoparticles, 5 to 15 wt. % MnO2 nanoparticles, 15 to 25 wt. % CuO nanoparticles, and 55 to 65 wt. % g-C3N4 nanosheets. The MgO nanoparticles, MnO2 nanoparticles, and CuO nanoparticles are disposed on the g-C3N4 nanosheets.

The invention discloses a room-temperature rapid preparation method of light metal hydroboron, and relates to the technical field of hydrogen storage materials. The method specifically comprises the following steps that S1, metal hydride is subjected to ball milling pretreatment according to a certain ball-to-material ratio; s2, mixing the pretreated metal hydride and dimethyl sulfide borane in a flask, then adding a solvent, and carrying out ultrasonic-assisted reaction; and S3, transferring the solid product into a tubular furnace, and carrying out vacuum drying to obtain the metal borohydride. The method has the advantages of simple process, low price, one-step reaction and high safety; the yield is obviously improved, the reaction conditions are obviously reduced, the production efficiency is greatly improved, and the method has an industrialization prospect.

To provide a method for producing borohydride and its sheet from hydrogen and boron by a relatively simple method.SOLUTION: The method for producing a hydrogen boride and a sheet thereof is characterized in that boron fine particles 21, an atmospheric pressure plasma generator 27, and a working gas containing hydrogen are used as main components, at least hydrogen is supplied to the atmospheric pressure plasma generator 27 as the working gas of the atmospheric pressure plasma generator 27, and the boron fine particles 21 are irradiated with atmospheric pressure plasma to produce a hydrogen boride 7 and a hydrogen boride sheet 8 which is a sheet thereof. Preferably, boron fine particles are added to the working gas. More preferably, it is desirable that a stirrer and a dish are added to the container, and the container is disposed so that the boron fine particles placed in the dish are irradiated with the atmospheric pressure plasma.SELECTED DRAWING: Figure 2

The invention discloses a cobalt boron hydrogen complex with a hexahedron structure and a preparation method and application thereof, and belongs to the technical field of cobalt boron cluster complexes. The molecular formula of the cobalt boron hydrogen complex with the hexahedral structure is C30H47Co3B2. The invention further discloses a preparation method of the cobalt boron hydrogen complex with the hexahedral structure. The preparation method of the cobalt boron hydrogen complex comprises the following step: reacting the diaryl bridged double cobalt metal complex with borane-tetrahydrofuran (BH3THF) to prepare the cobalt boron hydrogen complex with a hexahedron structure. The cobalt boron hydrogen complex with the hexahedral structure is applied to a catalyst for catalytic hydrogenation reaction. The cobalt boron hydride complex with the hexahedral structure is prepared by adopting a borane direct coordination mode, so that the use of a reducing agent metal hydroboron is avoided, and the reaction is milder and more controllable. The cobalt boron hydrogen complex with the hexahedron structure has a good application prospect.

The invention discloses a preparation method and application of a foamed phosphorus-doped carbon nitride confinement metal cobalt photo-thermal catalyst, and belongs to the field of photo-thermal catalytic material preparation and hydroboron hydrogen production. According to the preparation method, melamine is treated through a mixed acid solution of hydrochloric acid and phosphoric acid, foamed phosphorus-doped graphite-like phase carbon nitride is obtained in one step by means of self-assembly of a melamine-cyanuric acid supramolecular precursor, then dipping is performed through a cobalt salt solution, Co < 2 + > is subjected to confined adsorption in a foamed carbon nitride structure, and the carbon nitride is prepared. And finally, reducing the foamed phosphorus-doped graphite-like carbon nitride into metal cobalt in situ through NaBH4, so as to prepare the foamed phosphorus-doped graphite-like carbon nitride confinement cobalt photo-thermal catalyst. The foamed structure is beneficial to transmission of reactant molecules, confined cobalt provides more active sites for surface reaction, the forbidden band width of carbon nitride is reduced after phosphorus doping, and the visible light excitation electron transition capability can be enhanced.

The invention relates to a process for preparing a polymer comprising the preparation of a catalytic system including neodymocene borohydride and a dialkylmagnesium cocatalyst wherein the alkyls are primary alkyls, followed by the polymerization of a monomer selected from ethylene and a monomer mixture containing ethylene and a 1,3-diene in the presence of the catalytic system and an additive, a dialkylmagnesium of formula RB-Mg-RL, wherein RB is a secondary alkyl of formula R'2CH and RL is a primary alkyl of formula R'CH2, the R's being alkyls. The process is made less sensitive to variations in impurities in a polymerization plant in controlling the number-average molar masses.

The invention discloses alkali metal ion intercalated molybdenum disulfide as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) uniformly mixing molybdenum disulfide and alkali metal hydroboron to obtain a mixed material; (2) transferring the mixed material into a sealable container, and sealing; (3) calcining the sealed container; and (4) naturally cooling to room temperature, washing the solid powder with deionized water, filtering, and drying to obtain the alkali metal ion intercalation molybdenum disulfide (M-MoS2 for short). The product is excellent in performance, the electronic structure of MoS2 is optimized through intercalation of alkali metal ions, the conductivity is remarkably improved, the diffusion rate of sodium ions is increased, and the cycling stability is greatly improved; a solid-phase sealing reaction is adopted, so that the method is green and environment-friendly; the reaction time is short, and zero emission of harmful gas is realized. The post-treatment purification step is simple, the alkali metal borohydride is naturally decomposed in the washing process, and no impurity is left; the equipment is simple, low in operation risk and low in energy consumption.

Methods of ion implantation and related systems are provided herein. The ion implantation method comprises vaporizing a precursor comprising a metal borohydride compound to obtain a vaporized precursor, and contacting the vaporized precursor with a substrate under vapor deposition conditions to form a film on the substrate. The metal borohydride compound isotope is enriched in at least one boron isotope.

This invention discloses an electrocatalytic material of multi-metal titanium oxide supported on a titanium-based support, its preparation method, and its applications. The method involves pretreating the titanium-based support with borohydride to construct a rough activation layer on its surface. A precursor solution containing one or more metal ions is then loaded onto the titanium-based surface. After drying, the solution is calcined at a specific temperature to form a multi-metal titanium oxide catalytic layer in situ on the titanium-based support. The process of this invention is simple, the conditions are mild, and the types and composition of metals can be flexibly controlled. The integrated titanium-based multi-metal titanium oxide electrode prepared by this method exhibits both high activity and high stability, and is expected to reduce the cost of hydrogen production through water electrolysis, and is suitable for industrial applications of hydrogen production through water electrolysis.

This invention discloses a method for preparing benzyl 3-methyl-5-oxopiperidin-1-carboxylic acid ester and its intermediates. The method uses ethyl acetoacetate as a starting material, proceeding through trifluoromethanesulfonation to generate an enol trifluoromethanesulfonate intermediate, palladium-catalyzed cyanation, catalytic hydrogenation, reduction-cyclization transformation under a borohydride / transition metal salt system, nitrogen carbonyl protection, and sulfonium ylide-mediated transformation to obtain the intermediate. The intermediate is further rearranged / cyclized to obtain the target compound. Compared with existing routes, this invention avoids the use of malodorous / high-risk thiol reagents and highly corrosive acids, thus enabling the preparation of the target compound.

The present invention relates to a catalytic system based on at least a neodymium borohydride-ferrocene, a dialkyl magnesium compound and a dialkylzinc compound. The catalytic system can be used for homopolymerization of ethylene and copolymerization of ethylene and 1, 3-diene.

The application belongs to the technical field of hydrogen storage materials, and specifically discloses a rapid preparation method of magnesium borohydride. First, magnesium hydride and rare earth borate (yttrium borate, lanthanum borate, etc.) are uniformly mixed and then subjected to solid-phase ball milling treatment to obtain a solid-phase ball milling product, namely, magnesium borohydride; then, the solid-phase ball milling product is uniformly mixed in a solvent, and high-purity magnesium borohydride can be obtained after purification. The raw material, rare earth borate, used in the application can be synthesized by a simple hydrothermal method, and the process is simple and low in cost. The yield of nearly 50% can be achieved in only 2 hours, which has the industrial production potential of rapidly synthesizing magnesium borohydride and can ensure the high purity of the prepared magnesium borohydride.

The present invention relates to a process for preparing a polymer containing ethylene units and bearing at the end of the chain a 1-arylethenyl group, which process comprises the polymerization of a monomer selected from ethylene and a monomer mixture containing ethylene and a 1,3-diene in the presence of a catalytic system and a 1-methyl-1-arylethene, the catalytic system being based on a neodymocene borohydride and an organomagnesium compound.

This invention discloses a method for synthesizing 2,4,5-trifluorophenylacetic acid, comprising reacting a compound of formula II with a nitro compound in a first reaction, followed by a second reaction with a borohydride to obtain a compound of formula III; the compound of formula III then undergoes a third reaction with a nitrite to synthesize 2,4,5-trifluorophenylacetic acid. This synthetic method uses readily available raw materials, is simple to operate, low in cost, and has a short route. It is also environmentally friendly, safe, and reliable, significantly improving the feasibility of industrial production.

This invention discloses a method for preparing vanadium-nickel borohydride nanoparticle electrocatalytic materials, belonging to the field of nanomaterial electrocatalysis technology. Using carbon black as an auxiliary source and sodium borohydride as a reducing agent, a mixed salt solution of nickel and vanadium is used to obtain a precursor powder containing nickel, vanadium, and boron through a one-step reduction method. This precursor powder is then calcined at a certain temperature to obtain NiVB2 / C. By controlling the molar ratio of sodium borohydride to the metal salt and the calcination temperature, the morphology of the catalyst is adjusted, resulting in NiVB2 / C nanoparticles. This invention features a simple and controllable production process, low cost, significantly improved catalytic activity in the hydrogen evolution reaction, and excellent electrocatalytic performance.