33results about How to "Good catalytic hydrogenation performance" patented technology

The invention concerns the reaction of benzene catalyst adding hydrogen, specific speaking, it's a kind of catalyst to produce 4-ammonia base-3-F benzene fen and its application. The catalyst is made of carrier, active parts and helping dose. The main active parts are: dear metal Pt, Pd or Rh, whose weight is of catalyst 0.1%--20%. Help doses are IA, ó�A, ó¾B, ó° or Sparse soil chemical element. The catalyst has the feature of high active in reactivation, good choosing ability and many reuses. The catalyst can also be used in other replacing nitric unit benzene adding hydrogen and catalyst process.

The invention provides a graphene loaded high-dispersion nano Ni catalyst as well as a preparation method and application thereof. The catalyst is obtained by loading high-dispersion Ni nano-metal on the surface of graphene, and doping less amorphous Al2O3, wherein the mass percent content of graphene is 40-67%, the mass percent content of Ni is 10-40%, the mass percent content of amorphous Al2O3 is 2-8%, the size distribution of Ni particles is 8-13nm, and the specific area of the catalyst is 155-200 m<2>/g. The preparation method comprises the following steps of: preparing a graphene/lamellar bimetal hydroxide composite material in one step through the hydroxide precipitation and reduction effect, and then preparing the graphene loaded high-dispersion metal Ni nano catalyst through an in-situ self-reduction method by using the reducibility of graphene. The catalyst is used for selectively hydrogenating the cinnamyl aldehyde to synthesize the benzenepropanal, and the conversion rate and the benzenepropanal selectivity are respectively 86-100% and 88-96%.

The invention discloses an oxide supported palladium hydrogenation catalyst and a preparation method thereof; the catalyst carrier is a metallic oxide; and the active component is noble metal palladium nano particle. The catalyst comprises 0.1-5% palladium and the balance of metallic oxide. The preparation method comprises the following steps: (1) preparing the metallic oxide carrier with sol-gel process; (2) dissolving the palladium salt in the ionized water to prepare the palladium salt water solution of which the concentration is 0.01-0.2 mol/L; adding the metallic oxide in the palladium salt water solution and ultrasonically dispersing for 0.5-1 hour; under the effect of magnetic stirring, adding the water solution containing the reducing agent drop by drop, wherein the ratio of the reducing agent to the palladium salt is (1: 1)-(2: 1); after adding, stirring for 1-2 hours; and (3) stirring in the oil bath for 1-2 hours, then filtering, washing and stoving to obtain the oxide supported palladium hydrogenation catalyst. The oxide supported palladium hydrogenation catalyst has high catalytic activity and high selectivity for the cinnamyl aldehyde hydrogenation to prepare the benzene propanal.

The invention provides a high-dispersion supported copper-based catalyst as well as a preparation method and an application thereof. The catalyst can be represented as Cu/MO-ZrO2, wherein copper nanoparticles are uniformly dispersed on a compound metal oxide carrier, the specific surface area of the catalyst is between 60-110m<2>/g, the weight ratio of Cu is 10-40%, and the grain size of Cu is 5-20nm. Precursor nanoparticles of a compound metal hydroxide catalyst uniformly dispersed in molecular level and adjustable in constitution and structure are synthesized by the method by means of a forced micromixing effect caused by a strong shear force, a centrifugal force and a counter-acting force of an all-backmixing liquid film reactor, and a selective guide effect of a surfactant. The catalyst precursor is roasted and reduced to obtain the high-dispersion supported copper-based catalyst. The catalyst is mainly used for selective catalytic hydrogenation of dimethyl oxalate, and the conversion ratio and the selectivity respectively reach 90-100% and 85-95%. The copper-based catalyst has the characteristics of good stability and simple preparation method.

A hydrodesulfurization method of coking benzene is provided. A preparation process of a hydrodesulfurization catalyst used in a hydrodesulfurization reaction includes: respectively dipping an aluminium oxide-titanium dioxide mixed power carrier into solutions containing active metal elements comprising molybdenum, nickel, cobalt and tungsten, with the solutions containing citric acid; dipping a NaZSM-5 molecular sieve into a solution containing copper and/or zinc; drying; calcinating; mixing the dipped aluminium oxide-titanium dioxide mixed power carrier and the dipped NaZSM-5 molecular sieve; processing the coking benzene by a rectifying tower before hydrodesulfurization; and performing pre-hydrogenation, main hydrogenation and removal of inorganic sulfur to finish sulfur removal. The NaZSM-5 molecular sieve loaded with an active component has an effect of selective adsorption for thiophene. The aluminium oxide-titanium dioxide mixed power carrier loaded with the active metals has good catalytic hydrogenation effects for the thiophene. By cooperation of the NaZSM-5 molecular sieve loaded with the active component and the aluminium oxide-titanium dioxide mixed power carrier loaded with the active metals, good removing effects can be achieved even at a low reaction temperature. The citric acid promotes formation of an active phase, improves hydrogenation activity of the catalyst and prolongs maintaining time of the activity of the catalyst.

The invention provides a preparation method of a magnetic nickel/carbon nanometer composite material and application thereof. The preparation method comprises the following steps of (1) preparation of a metal organic framework precursor: dissolving 1,3,5-benzene tricarboxylic acid into an alkaline water solution, adding an alcohol and water mixed solution of soluble metal salt, mixing and stirring at normal temperature, centrifuging, washing and drying, so as to obtain the metal organic framework precursor; (2) preparation of a magnetic carbon composite material: calcining the precursor obtained in step (1) under the inertia gas atmosphere, and cooling, so as to obtain the magnetic carbon nanometer composite material. The preparation method of the magnetic nickel/carbon nanometer composite material has the advantages that the method is simple, and the cost is low; the solvent heat synthesizing in the reaction kettle in the preparation process of the precursor of the magnetic nickel/carbon nanometer composite material is not needed, and the potential of batch production is realized.

The invention relates to a metal catalyst and a preparation method as well as application on cyclohexane preparation by selective hydrogenation of benzene, wherein the Ru content is 85%-95% and the M content is 5%-15%. The preparation method comprises the following steps: (1) adding precursors including a ruthenium compound and a compound of a transition element M into diphenyl ether containing oleamide, stirring so as to obtain a solution A, and heating to 100-140 DEG C, keeping the temperature constant for 10-30 minutes; (2) injecting a strong reducing agent rapidly into the solution A, rising the temperature to 160-200 DEG C under rapid stirring, then rising to 180-220 DEG C slowly, backflowing for 30 minutes, and stopping heating and reaction; and (3) adding a dispersing agent, and carrying out centrifugal separation so as to obtain the alloy catalyst containing Ru-M. Compared with the prior art, the catalyst used in preparation of cyclohexane by selective hydrogenation of benzene is controllable in catalytic performance, and has high activity and high selectivity to cyclohexane.

The invention relates to a catalyst for preparing tetrahydronaphthalene through selective catalytic naphthaline hydrogenation and a preparation method and application thereof. Compared with naphthaline, tetrahydronaphthalene belongs to a high-value product. By adopting the method, the high added value and deep processing and fine utilization of downstream products of coal tar can be achieved. In the method, a high temperature and high pressure reaction still is adopted, and it is first found that the oxidation-state catalyst has the significant effect on tetrahydrothalene preparation through selective naphthalene hydrogenation. The used hydrogenation catalyst uses gamma-Al2O3 as a carrier and uses Ni and Mo as active metals, the content of the Al2O3 carrier is 70%-90%, the total load of the Ni and Mo is 12%-36%, and the Ni and Mo load ratio is 1:23 to 8:16. The invention provides a high-added utilization method of downstream products of coal tar, which has been ignored by people for along time. The used oxidation-state catalyst has the advantages of simple preparation, easy storage, good recycling stability, easy regeneration and the like.

The invention provides a nickel-based amorphous hollow microsphere alloy catalyst, and a preparation method and an application thereof. The catalyst adopts a meso-porous hollow microsphere as a carrier, nickel-based amorphous alloy is uniformly loaded on the surface of the carrier, and the catalyst comprises 0.1-30.0wt% of the nickel-based amorphous alloy and 70.0-99.9wt% of the meso-porous hollow microsphere. The preparation method of the catalyst comprises the following steps: preparing the meso-porous hollow sphere through a template guided synthesis technology, loading a soluble nickel salt on the meso-porous hollow sphere to obtain a nickel-containing meso-porous hollow microsphere carrier material, and allowing the nickel-containing meso-porous hollow microsphere carrier material to be in contact with and react with a BH<4><->-containing solution to prepare the nickel-based amorphous hollow microsphere alloy catalyst. The catalyst is used in the hydrodeoxygenation reaction of organic compounds containing an aromatic hydrogen C-O bond or an alkyl C-O bond, and has the advantages of high thermal stability, large specific surface area and fast mass transfer efficiency.

The invention belongs to the field of utilization of biomass energy and particularly relates to a method of preparing 4-ethylphenol by catalytically pyrolyzing bagasse with activated charcoal. The method includes the steps of: preparing bagasse as a raw material and activated charcoal as a catalyst, wherein the activated charcoal is prepared by performing water vapor activation on biomass; mechanically mixing the bagasse with the activated charcoal and performing catalytic pyrolysis to the mixture at 240-410 DEG C in a hydrogen atmosphere, and condensing pyrolysis gas to prepare a liquid product being rich in the 4-ethylphenol. Yield of the 4-ethylphenol and purity thereof in the liquid product are high. The method employs the bagasse, which has wide source, as the raw material, and the activated charcoal, which is low in cost, as the catalyst, thus significantly reducing production cost of the 4-ethylphenol.

The invention discloses a supported efficient hydrogenation catalyst which contains the following materials in parts by weight: 15-20 parts of pretreatment carrier, 4-7 parts of metal precursor, and 14-24 parts of deionized water, wherein the pretreatment carrier is prepared by performing acid treatment on Na-montmorillonite and assisting with an ultrasound microwave combined effect. The inventionalso discloses a preparation method of the catalyst. The catalyst prepared according to the invention has excellent catalytic hydrogenation performance, the supporting capacity of the metal precursorcan be increased by the pretreatment carrier, and meanwhile, an acid site used for promoting the catalytic performance is introduced, and by mutual match of vacuum impregnation and heat preservationunder protection of a hydrogen atmosphere, clustering of active components is effectively avoided, so as to be beneficial to improvement of the activity of the catalyst; and the catalyst can be used for catalytic hydrogeneration reaction, and is wide in market prospect.

The invention discloses a preparation method of rubber antioxidant N,N'-di-sec-butyl-1,4-phenylenediamine. The preparation method comprises following steps: step 1, p-phenylenediamine, butanone, and a catalyst are delivered into a high-pressure autoclave, air in the high-pressure autoclave is replaced with nitrogen, and an obtained mixture is heated to 160 DEG C, and is reacted for 10h under 3.3 to 5.6MPa, wherein mass ratio of p-phenylenediamine to butanone is 1:6; and step 2, after reaction, an obtained product is subjected to cooling, filtering, and distilling so as to remove excess butanone and obtained sec-butyl alcohol so as to obtain N,N'-di-sec-butyl-1,4-phenylenediamine. According to the preparation method, catalytic hydrogenation effect is excellent in presence of the catalyst, the preparation method is simple, and product yield is high.

The invention discloses a catalyst for preparing 1, 4-butanediol through fixed bed hydrogenation of 1, 4-butynediol, and the catalyst is granular Raney nickel doped with niobium element; and the catalyst comprises the following components in percentage by mass: 88-98% of nickel, 0.1-5% of niobium and 5-10% of aluminum. The method comprises the following steps: preparing metal precursor alloy particles; and using alkali liquor for activating the metal alloy particles. The preparation process is simple to operate and good in catalytic hydrogenation effect.

The invention relates to a catalyst for catalytic hydrogenation and a preparation method and application thereof. The catalyst comprises the following components, by mass: 9-10% of cerium, 4-5% of cobalt, 4-5% of aluminum and the balance of nickel. According to the catalytic hydrogenation catalyst provided by the invention, the problem of poor hydrogenation efficiency of 1, 8-diamino-3, 6-naphthalene disulfonic acid at present is solved by redesigning the catalyst components, the catalytic hydrogenation reduction catalytic efficiency of the 1, 8-dinitro-3, 6-naphthalene disulfonic acid is improved, and the conversion rate of the 1, 8-dinitro-3, 6-naphthalene disulfonic acid is over 99%.

The invention discloses an alpha, beta-unsaturated aldehyde in-situ selective hydrogenation reaction process taking water as a cheap hydrogen donor. According to the method, gas containing carbon monoxide is used as an oxygen acceptor, alpha, beta-unsaturated aldehyde is subjected to a selective hydrogenation reaction in water through a catalytic material, and the unsaturated alcohol is prepared through selective hydrogenation of the alpha, beta-unsaturated aldehyde. According to the method, the C = O double bond of the alpha, beta-unsaturated aldehyde can be activated and hydrogenated by using a catalytic material and taking water as a hydrogen donor, the excellent catalytic activity is shown, the selectivity can reach 80% or above, and the method has the advantages that the low-cost water is used as a hydrogen source, and the alpha, beta-unsaturated aldehyde is obtained through in-situ hydrogen production. The invention relates to one-step conversion from beta-unsaturated aldehyde to unsaturated alcohol through catalytic hydrogenation.