236 results about "Nickel catalyst" patented technology

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol through hydrogenation of 3-hydroxypropionaldehyde as well as a preparation method and application of the supported nickel catalyst, and relates to the technical field of catalysts. The modified long-chain multi-carbon inducer is used, and a special long-chain molecular structure and a branched chain group of the inducer can effectively and selectively adsorb and occupy a micropore impregnation site; the preparation method has the beneficial effects that more active component nickel species are obviously promoted to be dispersed in main reaction confinement spaces such as mesopores and macropores and interact with the carrier to form effective active sites, and active component steeping liquor is inhibited from entering micropore channels due to capillary action; the active site failure caused by agglomeration of nickel species in micropores in the subsequent drying and roasting process of the catalyst precursor is avoided, the efficient and directional reaction is ensured, the generation of by-products is greatly reduced, the pressure is relieved for the subsequent product rectification separation, and the final product purity is improved. The catalyst provided by the invention can still keep an excellent catalytic effect when the air speed of a 3-hydroxypropionaldehyde solution is increased to 6.5 h <-1 >.

The invention relates to the technical field of powder metallurgy materials, and discloses rare earth microalloyed ultrahigh-strength high-toughness hot work die steel and a preparation method thereof.The die steel is prepared from 4Cr5MoSiV1 pre-alloyed powder, rare earth hydride, boron carbide and porous amorphous carbon powder loaded with a nickel catalyst. The preparation method comprises the steps of material mixing, sheath packaging, graded dynamic reaction thermal devolatilization, hot isostatic pressing densification and heat treatment, in the graded dynamic reaction thermal devolatilization, active hydrogen generated by decomposition of rare earth hydride is used for reducing oxide on the surface of powder, and nickel catalyzed carbon powder is used for capturing water vapor at low temperature to generate CO to be discharged. An oxide film on the surface of the powder is thoroughly removed through in-situ chemical reaction, original particle boundaries are eliminated, meanwhile, a nano strengthening phase with high thermal stability is generated in situ, and the high-temperature strength, impact toughness and tissue compactness of the die steel are remarkably improved.

The invention belongs to the technical field of preparation of transition metal organic photocatalysts, and particularly relates to design and a preparation method of a carbazole terpyridyl nickel catalyst. The invention aims to design and synthesize a carbazole terpyridyl nickel catalyst with light / nickel synergistic catalytic activity. The preparation method comprises the following specific synthesis steps: reacting different types of alpha-pyridone pyridinium and alpha, beta-unsaturated ketone in methanol, and carrying out suction filtration, washing, drying and other operations to obtain the corresponding carbazole terpyridyl ligand. The carbazole terpyridyl ligand and anhydrous nickel bromide are subjected to a heating reflux reaction in a tetrahydrofuran solution, and the corresponding carbazole terpyridyl nickel catalyst is obtained through methanol washing, suction filtration, drying and other operations. The terpyridyl nickel catalyst has high catalytic activity in a C-N, C-O and C-S coupling reaction promoted by visible light.

This invention relates to nickel catalysts with alkali ions for homopolymerization and copolymerization. This invention also relates to methods of preparing copolymers and to methods of degrading copolymers.

The invention relates to the field of advanced ceramic materials, in particular to a ceramic matrix composite (CMC) and a preparation method thereof. The technical problems that a traditional CMC preparation technology is long in period, poor in structural uniformity and insufficient in toughness are solved. According to the method, surface-modified aluminum oxide ceramic microspheres are used as reinforcements, the surfaces of the microspheres are sequentially modified with hexagonal boron nitride nanosheets and a metal nickel catalyst, the microspheres, silicon carbide nanoparticles and a polycarbosilane precursor are mixed to form slurry, and a complex component is formed through multi-material additive manufacturing. A green body is prepared by using a 3D printing technology combining photocuring and material extrusion; carrying out ultraviolet curing on the green body, and carrying out staged heat treatment in an inert atmosphere, so that the precursor polymer is subjected to cross-linking curing, and meanwhile, carbon nanowires grow through in-situ catalysis; and finally, sintering under a pressurizing condition to realize matrix densification. The preparation period is greatly shortened, and the obtained composite material is uniform in structure, compact in matrix and excellent in mechanical property.

The invention relates to a carbon nano reinforced thermoplastic polyurethane composite material as well as a preparation method and application thereof. The composite material is prepared from the following components in parts by mass: 5 to 20 parts of diisocyanate, 10 to 30 parts of oligomer dihydric alcohol, 1 to 10 parts of bifunctional chain extender and 1 to 20 parts of filler, the filler is prepared from the following components in parts by mass: 0.95 to 18 parts of inorganic filler and 0.05 to 2 parts of carbon-based nano filler; preparing a carbon-based nanofiller of flaky carbon nanofibers, tubular carbon nanofibers or fishbone-shaped carbon nanofibers from reaction gas by using a metal catalyst through a chemical vapor deposition method; the metal catalyst is selected from an iron-nickel catalyst or a nickel-copper catalyst, the reaction gas comprises a carbon source gas and a reducing gas, the carbon source gas is selected from carbon monoxide or ethylene, and the reducing gas adopts hydrogen. Compared with the prior art, the material has good mechanical properties and damping performance, especially has excellent normal-temperature damping performance and damping temperature range, and is suitable for 3D printing.

This invention relates to nickel catalysts with alkali ions for homopolymerization and copolymerization.

The invention provides a method for constructing an aryl C-P bond through a reaction of an Ar-F compound of a nickel catalysis electron donating group, which comprises the following steps: in the presence of a nickel catalyst, an additive and alkali, carrying out a coupling reaction on a substituted aryl compound in a formula B and a compound in a formula C diphenylphosphine oxide in an organic solvent to generate an aryl phosphine oxide compound in a formula A, the reaction formula is shown in the specification, Ar is or, and R is an electron-donating group. The method disclosed by the invention has the effects that the substrate has universality, the operation is simple, the condition is mild, a noble metal catalyst and a phosphine ligand are not needed, the cost is low, and the yield is high.

This invention provides a coal tar pitch-based nickel catalyst, its preparation method, and its application, belonging to the field of solid waste resource recycling and synthetic carbon materials technology. This invention uses a mixed roasting method to prepare a coal tar pitch-based nickel catalyst with micropores and mesopores from the residual coal tar pitch after coal tar extraction. The synergistic effect of active nickel as an active site and the functional groups on the support surface significantly improves its catalytic liquefaction performance, exhibiting the advantages of "low cost, high temperature resistance, and strong adaptability." The preparation method provided by this invention not only offers an effective way for the high-value recycling of coal tar pitch but also provides a low-cost material for green conversion, environmental governance, catalysis, and other fields. It represents a green resource utilization strategy with significant economic and environmental benefits and broad commercial prospects.

The invention discloses a neutral phosphine phenol nickel catalyst based on a tert-butyl structure. The catalyst has a structure shown as a formula (I), wherein R1 and R2 are respectively and independently selected from hydrogen, C1-C20 alkyl, fluorine, chlorine, bromine, iodine, nitryl, hydroxyl, substituted silicon group and C1-C20 substituted alkyl; r3 is independently selected from C1-C20 alkyl, C1-C20 substituted alkyl, phenyl or substituted phenyl, R4 and R5 are independently selected from hydrogen, fluorine, chlorine, bromine, iodine, C1-C20 alkyl, aryl, an oxygen-containing group, a nitrogen-containing group, a sulfur-containing group, a boron-containing group, an aluminum-containing group, a phosphorus-containing group, a silicon-containing group or a tin-containing group; tert-butyl is introduced into para-position and meta-position of a ligand phenol oxygen ring, and a protection barrier is formed by utilizing the steric hindrance effect of the t-butyl, so that decomposition and deactivation of the catalyst under a high-temperature condition are inhibited, the catalyst can stably play a catalytic role in an industrial common medium-high-temperature polymerization environment, and the process adaptation range of the catalyst is widened.

This invention discloses a transition metal phosphide catalyst, its preparation method, and its application, belonging to the field of electrocatalysis technology. The process includes: firstly, dissolving nickel salt, lanthanum salt, urea, and ammonium fluoride in deionized water to synthesize a nickel-lanthanum layered hydroxide nanosheet precursor via a hydrothermal method; secondly, preparing a lanthanum-doped nickel phosphide catalyst using a phosphating reaction; and thirdly, utilizing a lanthanum doping strategy to modulate the electronic structure of nickel phosphide and improve its electrocatalytic reaction performance. This lanthanum-doped nickel phosphide material exhibits good catalytic activity when used to catalyze hydrogen evolution and sulfide ion oxidation reactions. In an integrated two-electrode electrolyzer for sulfide ion oxidation-assisted hydrogen production, it outputs 10 mA cm⁻¹. ‑2 This invention achieves the goal of producing hydrogen and high-value-added sulfur products with low energy consumption by requiring a relatively low voltage of 0.525 V at a current density. It has advantages such as simple preparation process, controllable operating conditions, and low raw material costs, possessing the potential for large-scale production and serving as a high-performance catalyst for electrocatalytic hydrogen production and sulfur ion oxidation reactions.

The invention provides an alpha-diimine ligand compound, an alpha-diimine nickel catalyst and a preparation method and application of the alpha-diimine ligand compound and the alpha-diimine nickel catalyst, and belongs to the technical field of organic synthesis. Wherein R1 is selected from hydrogen, methoxyl or tertiary butyl; r2 is selected from methyl, ethyl or isopropyl; and R3 is selected from hydrogen or methyl. The alpha-diimine nickel catalyst prepared by adopting the alpha-diimine ligand compound can catalyze olefin to carry out homopolymerization reaction or copolymerization reaction, so that not only is excellent catalytic performance shown, but also a polyolefin material obtained by catalyzing olefin monomer homopolymerization reaction has excellent elastic recovery performance; and the catalyst has certain application potential in olefin polymerization industry.

The invention discloses an electrochemical method of deuterated silane. The method comprises the following steps: in a protective atmosphere, mixing substituted silane, an electrolyte, a nickel catalyst, a ligand and deuterium water in a solvent, carrying out an electrochemical deuterization reaction under a constant current condition, and carrying out post-treatment to prepare the deuterated silane compound. The method takes deuterium water as a deuterium source, and is green, economical, cheap and easy to obtain; a catalytic amount of nickel and silane form a silicon-nickel intermediate, so that the polarity of silicon is reversed, and the generation of a silane self-coupling product and a silanol byproduct is effectively avoided; the electrochemical synthesis method has the characteristics of mild reaction conditions, cleanness, greenness and simplicity in reaction operation. The electrochemical synthesis method provided by the invention realizes successful preparation of the natural product post-modified deuterated silane, and has important significance in the aspects of drug development and deuterated compound research; the electrochemical synthesis method disclosed by the invention can resist high current to prepare the ten-gram-grade deuterated silane, and has a wide industrial application prospect. In addition, the deuterated silane synthetic product can be used as a silicon deuteration reagent, the practicability of the deuterated silane synthetic product in unsaturated bond reduction reaction is proved, and the deuterated silane synthetic product has a wide development prospect.

The invention relates to a method for producing 2-aminopropane-1-ol from hydroxyacetone by reductive amination using ammonia water and a co-solvent. The method comprises the following steps: mixing hydroxyacetone and ammonia water at a temperature of not more than 20 DEG C to obtain an oxazoline intermediate product; and adding either a solvent alone or a solvent and a second ammonia water to the oxazoline product in the presence of a nickel catalyst and hydrogen, and hydrogenating at a temperature of not more than 90 DEG C and a pressure of not more than 12 barggage to obtain 2-aminopropan-1-ol.

The application relates to the technical field of fluorine-containing iodoalkane preparation, in particular to a preparation method of high-carbon-number diiodoperfluoroalkane, which comprises the following steps: reacting tetrafluoroethylene and elemental iodine to generate diiodotetrafluoroethane; and under the action of a catalyst, the diiodotetrafluoroethane is subjected to telomerization reaction with tetrafluoroethylene to generate high-carbon-number diiodoperfluorobutane and diiodoperfluorohexane; and the catalyst is a metal nickel catalyst supported on silicon dioxide. The metal nickel catalyst supported on silicon dioxide is used to make the diiodotetrafluoroethane and the tetrafluoroethylene subjected to telomerization reaction to obtain diiodoperfluoroalkane with higher carbon number. The application has the advantages of simple process, low reaction temperature and the like, and can significantly improve the yield of diiodoperfluorobutane and diiodoperfluorohexane.

The invention relates to a process for the manufacturing of biobased 3-methyl-delta-valerolactone (3MdVL) and 3-methyl-1,5-pentanediol (3MPD) via one- pot hydrogenation of anhydromevalonolactone (aMVL) in the presence of a Raney- Nickel catalyst. The hydrogenation occurs without solvent at a temperature from 120ºC-180ºC, preferably at 130ºC-170ºC and a pressure between 15-30 bar, preferably at a pressure between 18 and 22 bar. The hydrogenation time may vary between 3 and 25 hours, preferably between 6 and 24 hours.

The invention provides a bidentate aza-matched nickel complex, a preparation method and a nickel metal catalyst for catalyzing olefin polymerization, the bidentate aza-matched nickel complex has a structure as shown in a formula (I), in the formula (I), R1 and R2 are the same or different, and are independently selected from substituted or unsubstituted C1-C10 alkyl, C1-C10 alkoxy, C2-C10 alkenyl or C6-C10 aryl, and R2 and R3 are the same or different and are independently selected from substituted or unsubstituted C1-C10 alkyl, C1-C10 alkoxy, C2-C10 alkenyl or C6-C10 aryl; r3 is selected from hydrogen, methyl, methoxyl and trifluoromethyl; x is selected from chlorine or bromine. According to the bidentate aza-nickel complex provided by the invention, the binding force between amido and nickel metal is stronger, and meanwhile, the imine is substituted by aryl, so that the nickel metal catalyst has a higher heat stabilizer, and is obviously superior to the traditional alpha-diimine nickel catalyst.

The application provides a method for constructing a C-P bond through a nickel-catalyzed Hirao reaction, comprising the following steps: coupling a substituted aromatic compound 1 and a diphenyl phosphine oxide 2 in an organic solvent in the presence of a nickel catalyst, an additive and a base to generate an aromatic phosphine oxide compound 3, and the reaction formula is as follows: wherein X is any one of F, Cl, Br, I, OTf, B(OH)2 and OCF3; and Ar is an aromatic group. The method has the effects of universality of substrates, simple operation, mild conditions, low cost of noble metal catalysts and phosphine ligands and high yield.

The invention relates to the technical field of catalysts, in particular to a neutral nickel catalyst as well as a ligand, a preparation method and application thereof, and the ligand has a structure as shown in a formula I. According to the invention, a series of novel neutral nickel complexes with sandwich-like structures are developed based on an amide-aryl ketone skeleton structure for the first time; the series of catalysts are simple and efficient to synthesize, the ligand synthesis yield is greater than or equal to 80%, and the catalyst synthesis yield is greater than or equal to 80%; nuclear magnetic resonance monitoring shows that the nickel catalyst provided by the invention has high stability in air and does not deteriorate within 72 hours; during polymerization, no extra cocatalyst needs to be added, and the catalyst shows extremely excellent thermal stability and capability of inhibiting chain transfer side reaction in a solution copolymerization process and can resist poisoning of acrylate monomers at the same time.

The invention relates to the technical field of catalyst treatment, in particular to a Raney nickel catalyst reduction and passivation treatment system and a passivation method.The system comprises a deactivation pool, a hydrogenation reactor and a circulation pipeline which are connected in a closed loop mode; a sodium nitrate solution supply end, a temperature adjusting system and a multi-dimensional sensing assembly (a concentration sensor, a temperature sensor, a pH sensor, a pressure sensor, a flow sensor and the like) are arranged, and the core is a processing unit integrating a control module and a dynamic soft measurement model. The desalted water injection amount, the sodium nitrate solution concentration and the deactivation solution temperature are preset and dynamically optimized through the treatment unit, closed-loop circulation of a reaction system is achieved through a circulation pipeline, and the passivation process is judged based on the pH value change. According to the method, the passivation rate and the completion time are predicted by means of the dynamic soft measurement model, the optimal process parameters are output in a self-adaptive mode, and the problems that a traditional passivation method depends on artificial experience, and is low in safety and insufficient in efficiency are solved by combining a safety interlocking mechanism and a uniform mixing regulation and control strategy.

The present invention relates to a process for the enantioselective preparation of chiral 4-substituted 2-oxazolidinones of formula (la) or (lb) via asymmetric hydrogenation of the corresponding 4-substitued 2-oxazolones of formula (II) using a combination of palladium or nickel and a chiral bidentate P-ligand as catalyst. The oxazolidinones can then be converted to important chiral building blocks such as enantiopure chiral aminoalcohols and haloamines via decarboxylative ring opening reaction.

This invention discloses a method for the directional preparation of 2-methyl-1-butanol from methanol and n-butanol. The aim is to provide a method for the directional preparation of 2-methyl-1-butanol from methanol and n-butanol using methanol and n-butanol as raw materials, directly constructing the molecular framework of the target product, reducing complex separation steps, achieving high product selectivity, and suitable for industrial-scale production. The technical solution is as follows: S1. Add a metal-doped carbon-coated nickel-based catalyst, methanol, n-butanol, water, and an alkaline auxiliary agent to a reaction vessel and mix them evenly to obtain a reaction mixture system; S2. React the reaction mixture system obtained in step S1 at 160-200℃ for 6-24 hours under closed conditions. After the reaction, separate the liquid phase product to obtain a product containing 2-methyl-1-butanol; wherein, the mass ratio of methanol, n-butanol, water, alkaline auxiliary agent, and gallium-doped carbon-coated nickel catalyst is 4:1:5:1.3:0.15-4.5:0.5:5:1.3:0.15; This invention belongs to the field of alcohol catalytic conversion technology.

The application discloses a synthesis method of aromatic aldehyde, comprising the following steps: under inert atmosphere, a compound shown in formula I and a compound shown in formula II are reacted in an organic solvent containing a photocatalyst, a nickel catalyst, a ligand, a base and water under blue light irradiation to obtain aromatic aldehyde shown in formula III; formula I, formula II and formula III are structures as follows, ring A is selected from benzene, pyridine, thiophene, furan, pyridazine, indazole, indole, isoquinoline, quinoline, naphthalene, benzothiophene, dibenzofuran or dibenzothiophene; the application generates formyl radicals under the nickel synergistic photo-oxidation and reduction catalytic condition, and the formylation of bromobenzene and its derivatives is realized in a simple and efficient one-pot way, aromatic aldehyde is constructed, and the reaction has the characteristics of cheap and easily available raw materials, mild reaction conditions, controllable synthesis process, high separation yield / yield, green environmental protection, wide substrate applicability and the like.

This invention discloses a tungsten oxide-supported carbon-coated nickel catalyst, its preparation method, and its application. The catalyst includes a support and an active component supported on the support. The support is tungsten oxide containing both pentavalent and hexavalent tungsten ions, and the active component is nickel coated with a carbon layer. This catalyst can be applied to the catalytic conversion of cellulose to ethylene glycol. In an aqueous solvent, only an initial hydrogen atmosphere is required to achieve 100% conversion of cellulose, with an ethylene glycol monomer yield reaching 75%. This completes the one-step conversion of cellulose into a high-value fuel. The catalyst preparation and reaction process are characterized by high efficiency, greenness, economy, and renewability, showing broad prospects for industrial application.

This invention discloses an asymmetric (α-diimine) nickel-olefin catalyst based on ethylene acenaphthene as its framework, its preparation method, and its applications. The structural formula of the catalyst is shown in Formula (I), where X is chlorine or bromine. The catalyst has a simple preparation process and exhibits results contrary to conventional experimental observations when catalyzing ethylene polymerization: larger substituents lead to higher crystallinity in the polymerization product. Furthermore, this type of catalyst also exhibits good thermal stability and polymerization activity, showing promising prospects for industrial applications. Formula (I)

The invention relates to the technical field of organic synthesis chemistry and catalytic chemistry, and discloses a reaction method for obtaining a biaryl compound through Suzuki-Miyaura coupling based on C-S bond activation, aryl sulfide is used as an electrophilic reagent, aryl boric acid ester is used as a nucleophilic reagent, in the presence of a nickel catalyst, a bidentate ligand, alkali and copper salt, a reaction is performed in an organic solvent, and the biaryl compound is obtained. Thus, the corresponding biaryl compound is obtained. According to the method, traditional C-S bonds difficult to break can be efficiently activated under uniform conditions, electron-rich and electron-deficient aryl thioethers and various aryl borates are compatible, and the application range of a substrate is wide; meanwhile, the aryl sulfide does not need to be pre-oxidized or pre-functionalized, the steps are simple, the atom economy is high, and the method is suitable for large-scale production. The obtained biaryl compound can be widely applied to the fields of drug molecule synthesis, organic semiconductor materials and the like.

The invention discloses a preparation method of a catalyst for producing biological aviation kerosene by using high alcohol as a raw material and adopting a slurry reactor. The preparation method comprises the following steps: (1) respectively dissolving a nickel source and an organic amine source in methanol; slowly dripping the methanol solution of the organic amine source into the methanol solution of the nickel source under stirring; after dropwise adding, heating and carrying out reflux reaction for 30-90 minutes; filtering while hot, washing with methanol, collecting solid, and drying in vacuum to obtain the organic nickel catalyst. (2) respectively acidifying aqueous solutions of an organic amine source and a molybdenum source with diluted hydrochloric acid until the pH is 2-4; slowly dripping the acidified organic amine source into the acidified molybdenum source under stirring; after dropwise adding, stirring and reacting for 30-90 minutes; filtering, washing, collecting solids, and drying in vacuum to obtain the organic molybdenum catalyst. And (3) compounding the organic nickel catalyst and the organic molybdenum catalyst according to the mass ratio of 1: (1-10) to obtain the catalyst. The catalyst is simple in preparation process and low in energy consumption, and has high catalytic activity and high hydrodeoxygenation selectivity when being used for producing biological aviation kerosene by using high-carbon alcohol as a raw material and adopting a slurry reactor.

The application discloses a supported nickel catalyst and a method for catalyzing ethylene polymerization, and belongs to the technical field of ethylene polymerization. The supported nickel catalyst is prepared by mixing and reacting alkyl magnesium, chlorinated alkyl aluminum and a nickel complex shown in formula 1; wherein R and R' are independently selected from C1-C 10 alkyl, C6-C 18 aryl, C6-C 18 heteroaryl, C1-C 30 alkoxy, C2-C 30 alkylamino, C6-C 30 aryloxy, C6-C 30 arlamino, C 10 -C 30 aralkyl, C3-C 30 siloxy, halogen, nitro, one or more of which. The supported nickel catalyst has excellent stability and high catalytic activity, and can be mass-produced and applied. The supported nickel catalyst can be used for catalyzing ethylene polymerization to obtain ultrahigh molecular weight polyethylene which is low in branching degree, narrow in molecular weight distribution, good in mechanical property, easy to process and free of sticky kettle phenomenon.

Provided is a transition metal-doped nickel oxyhydroxide catalyst, its preparation method, and its application in seawater electrolysis for hydrogen production. The method includes: (1) constructing a three-electrode system and using a chronoamperometry or chronopotentiometry method to electrodeposit a precatalyst onto a conductive substrate from a mixed metal salt solution containing nickel, iron, and at least one other transition metal salt such as cobalt or chromium; and (2) using the precatalyst-loaded substrate as a working electrode in an alkaline solution and applying a constant current to perform an in-situ conversion, thereby forming the final transition metal-doped nickel oxyhydroxide catalyst. The resulting catalyst exhibits high catalytic activity, high selectivity for oxygen evolution, and exceptional long-term stability under high current densities, making it highly suitable for direct seawater electrolysis systems,