347results about "Organic reduction" patented technology

The invention provides a method for preparing a hydrogenation catalyst. Active components are introduced by a two-stage method; previously introduced metal components have strong action with a carrier through a roasting step, and subsequently introduced active components have no roasting step and have weak action with the carrier; and during vulcanization and usage of the catalyst, the active metal components having strong action with the carrier can inhibit migration and concentration of the active metals having weak action with the carrier, so the catalyst keeps ideal activity and stability. The catalyst prepared by the method can be used in a hydrotreating process of various distillate oils.

The invention discloses a preparation method for a hydrogenation catalyst. The metal components of the catalyst comprise one or two metals from Co and Ni as well as one or two metals from Mo and W; carbamide or ammonia is used as a reaction addition agent; a method of reaction in-situ in the hole of a carrier is adopted to lead the metal active components to generate nickel molybdate (cobalt) or nickel tungstate (cobalt) compounds, thereby being capable of avoiding the reaction between the metals and the carrier, simultaneously leading the metal active components to be easier to be sulfurized and being capable of improving the activity of the hydrogenation catalyst.

The invention relates to a platinum/carbon nanotube catalyst suitable for multiphase asymmetric hydrogenation reaction. Platinum is loaded on a carbon nanotube carrier. A preparation method comprises the following steps of: heating a purified carbon nanotube in nitric acid, washing, filtering, washing by using water until the pH value of filtrate is neutral, drying to obtain the carbon nanotube carrier, soaking in aqueous solution of chloroplatinic acid, and performing ultrasonic treatment at room temperature; and stirring and impregnating a mixture of the carbon nanotube and the aqueous solution of chloroplatinic acid, raising the temperature to 110 DEG C from room temperature, drying at the temperature of 110 DEG C, grinding into fine powder, reducing by using aqueous solution of sodiumformate with heating, filtering, washing by using deionized water and drying. The invention also provides the preparation method of the catalyst and application of the catalyst to the multiphase asymmetric hydrogenation reaction.

The invention belongs to catalyst technique field, concretely relates to a preparation method of catalyst for copper-zinc-aluminum gas phase aldehyde hydrogenation and product thereof, which solves the problems in existing technique that the preparation process of aldehyde hydrogenation catalyst is complex, repeatability is bad, catalyst crystal-size is heterogeneous, dispersion degree of active copper is not high, mechanical strength is small, selectivity to product is bad, especially when rising reactive temperature to enhancing reactive speed and heat energy efficiency, activity, selectivity and stability are bad. The method modifies the intermittent feeding mode to continuous feeding mode by step continuous coprecipitation method, specific surface and pore volume of catalyst is large, dispersion degree of active metal is high, catalytic activity is good, selective and stability have more improvement, and side reaction of esterification and etherification is reduced.

A method for efficient use of hydrogen in aromatics production from heavy aromatic oil. A hydrocarbonaceous stream comprising C₉⁺ hydrocarbons and an essentially pure hydrogen stream are hydrotreated and hydrocracked to produce a hydrocracking zone effluent comprising aromatics. The hydrocracking zone effluent is fractionated to separately recover C₄ and lighter hydrocarbons, hydrocarbons boiling between about 180° F. and about 380° F., and diesel. The heavier hydrocarbons are combined with a low purity hydrogen-containing stream and heated, then dehydrogenated or transalkylated to form hydrogen, volatile compounds, and aromatics. The hydrogen and volatile components are separated from the aromatics and treated by pressure swing adsorption to provide an essentially pure hydrogen-containing stream, which is compressed and provided to the hydrotreating and hydrocracking steps. Liquid products are recovered from the aromatics-containing stream.

The invention discloses a supported ruthenium catalyst and a preparation method thereof. The preparation method is characterized in that the preparation method comprises the following steps: 1, preprocessing a carrier with a soluble alkaline earth metal salt, wherein the mass of the soluble alkaline earth metal salt accounts for 0.1-20% of the mass of the carrier; and 2, dipping the alkaline earth metal salt processed carrier with a material which comprises a primary active component metallic ruthenium and an assisted catalytic component comprising one or several of Ni, Co, Pd and Pt, wherein the mass of the primary component metallic ruthenium accounts for 0.1-5% of the carrier, and the mass of the secondary component comprising one or several of Ni, Co, Pd and Pt accounts for 0.01-5% of the mass of the carrier. The catalyst of the invention is mainly applied to the selective hydrogenation process of an aromatic ring of an aromatic compound, wherein the aromatic ring of the aromatic compound has at least one alkyl group, one ester group, one hydroxyl group or an amino group and also has at least one C1-8 alkyl group. Compared with catalysts prepared with the prior art, the catalyst of the invention has the advantages of low cost, simple preparation method, high activity, good selectivity, high safety in the operation of the aromatic ring hydrogenation, realization of the operation of the aromatic ring hydrogenation under a low pressure, and good economy.

A shaped metal fixed-bed catalyst is disclosed which contains at least one catalyst alloy formed of a catalyst metal and an extractable alloying component. The catalyst is activated in an outer layer with a thickness of 0.1 to 2.0 mm starting from the surface by complete or partial extraction of the extractable alloying component. The catalyst may also contain promoters. The catalyst is distinguished from known catalyst in that it is formed exclusively of the catalyst alloy and has a total pore volume of 0.1 to 0.6 ml/g. The catalyst is used for hydrogenation, dehydrogenation and hydrogenolysis reactions.

The present invention relates to a catalyst for transfer hydrogenation, which is formed of a metal-organic framework having an MOF-808 based X-ray diffraction pattern.

A high crystalline porous MOF-808 based metal-organic framework exhibits excellent performance in the transfer hydrogenation of ethyl levulinate (EL) at high and low temperature.

The invention discloses a preparation method of nitrogen-doped hierarchical pore carbon. The preparation method includes: using biomass as a raw material, and mixing the biomass with a composite activator; heating for calcining, mixing a calcining product with deionized water, standing for precipitation, and filtering to obtain precipitate; performing after-treatment to obtain the nitrogen-doped hierarchical pore carbon, wherein the composite activator is sodium hydrogen carbonate/nitrogen-containing compound, a mass ratio of sodium hydrogen carbonate to the nitrogen-containing compound is 0.25-4:1, the nitrogen-containing compound comprises at least one of ammonium oxalate, ammonium hydrogen carbonate, ammonium chloride and ammonium nitrate, and a mass ratio of the biomass to the composite activator is 1:2-16. The composite activator is utilized to activate the biomass to obtain a functionalized nitrogen-doped hierarchical pore carbon material, the preparation method is simple and easy to operate, the biomass existing in nature can be utilized directly, the obtained carbon material has rich hierarchical pore structure and can be used as a catalyst carrier to prepare high-performance nano catalysts, and utilization value of the biomass is increased greatly.

A shaped, activated metal, fixed-bed catalyst with a pore volume of 0.05 to 1 ml/g and an outer activated layer consisting of a sintered, finely-divided, catalyst alloy and optionally promoters. The catalyst alloy has metallurgical phase domains, resulting from the method of preparation of the alloy, in which the largest phase by volume has a specific interface density of more than 0.5 mum-1.

The invention discloses a preparation method of a supported nickel catalyst, which comprises the following steps of: reacting soluble nickel salt solution and a precipitator to obtain a green precipitate, wherein the precipitator is mixed solution of sodium silicate and sodium carbonate, the Na<+> concentration is 0.1-1 mol/L, the amount of the sodium silicate is calculated according to the content of SiO2 in a carrier, and the amount of the sodium carbonate is 10-30 percent more than that of nickel nitrate based on a stoichiometric ratio; washing the precipitate by distilled water and carrying out supercritical drying or azeotropic distillation drying to obtain a supported nickel catalyst precursor; roasting the supported nickel catalyst precursor for 2-5 hours under N2 atmosphere at 200-600 DEG C, changing the N2 atmosphere into H2 atmosphere, and reducing the supported nickel catalyst precursor for 2-4 hours under H2 atmosphere at 300-550 DEG C to obtain the supported nickel catalyst with the surface area of high active metal nickel. The surface area of the obtained catalyst is 250-450m<2>/g, the average aperture is 4-16nm, and the pore volume is 1.0 -1.9cm<3>/g. The surface area of the active metal nickel of the obtained catalyst is 40-70m<2>/g. The catalyst prepared by using the method can be used for catalyzing hydrogenation of a benzene ring.

Disclosed is a preparation method for modified noncrystalline nickel alloy catalyst, comprising processes of heating up the metallic nickel and the metallic aluminium into a melting state, preparing the nickel aluminium alloy by rapid quenching, and extraction and dealuminizing; the utility model is characterized in that the alloy got from the extraction and dealuminizing is washed to a PH value of 7 to 13 by the deionized water; and then the alloy is contacted with the salt solution of one or a plurality of metal promoters selected from the rare earth metal or the IIB,VIB,VIIB,VIII group metal; and calculated based on the weight of the metal nickel, the weight of the promoter metal used in the contact is less than 10 percent by weight. The metallic modified noncrystalline alloy prepared by the method has the advantages of high retention rate of the metal promoters, high hydrogenation activity and stability.

The invention relates to a palladium coordination polymer molecule aggregate catalysis material as well as a preparation method and an application thereof. The catalysis material is a coordination polymer molecule aggregate catalysis material formed by self-assembling on the surface of a solid substrate, the precursor of the catalysis material comprises palladium coordination ion as well as pyridine containing multidentate ligand or high molecular ligand, wherein the palladium coordination ion is selected from one of tetrachloro combined palladium acid radical, dichloro-2, 2'-dipyridine palladous, and dichloroacetamide palladous, and the pyridine containing multidentate ligand or high molecular ligand is selected from one of 4, 4'-combined pyridine, 2, 4, 6- collidine triazine, metal or hollow tetra pyridyl porphyrin, trans-1, 2- collidine ethylene, combined dipyridylzinc thiocyanate and polyethylene pyridine. LB film preparation technology or layered assembly method is adopted for organism selective ethylenic bond organic hydrogenation reaction, thus having high catalysis efficiency, easy realization in separation of catalyst and reactant and product, convenient operation and low cost.

A method for preparing Pd/C catalyst for selective hydrogenation is provided. The content of Pd in catalyst is 0.2 to 5% by weight. The preparing process includes the following steps: active carbon carrier is washed by 0.1 to 5N concentration of acid washing liquid selected from hydrochloric acid, nitric acid or phosphoric acid; active carbon carrier is washed to neutrality by water and dried; the active carbon carrier is soaked in halide ion containing solution for 2 to 24 hours and dried; the Pd compound is sprayed on the active carbon carrier to form catalyst precursor, after aging and reduction process, the catalyst product is obtained. Metal Pd in catalyst has higher dispersion degree and the content of crystallite is very high.

The invention discloses amorphous alloy catalyst with controllable grain size being smaller than 50 nm and uniform grain size distribution, and adds a new variety for the prior amorphous alloy catalyst field. The activity ratio surface area of the amorphous alloy catalyst is 10 to 50 m<2>/g, the particle diameter can be controlled in the range of 2 to 50 nm, and the grain size distribution is uniform. The invention realizes the amorphous alloy catalyst with the grain size being smaller than 50 nm and achieves the controllable grain size and the uniform grain size distribution through the preparation method for controlling the reduction reaction rate by oil in water microemulsion. The amorphous alloy catalyst of the invention can be taken as hydrogenation catalyst containing unsaturated functional group compounds such as alkene, alkyne, arene, nitrile, nitro compound, carbonyl compound, etc., not only the catalytic performance is superior to the catalytic performance of the ordinary amorphous alloy catalyst, but also the catalytic performance can be controlled; the life of the catalyst is longer than the life of the ordinary amorphous alloy catalyst, and the catalyst can be recovered and reused time after time.

The invention discloses a noble metal supported catalyst and a preparation method and application thereof. The preparation method of the noble metal supported catalyst of the invention comprises the following steps: (a) titanium dioxide precursor dispersed solution with rich hydroxyl group and stannous salt solution are mixed, stirred, washed and dispersed into the water; (b) when stirring, soluble noble metal salt solution is added into the titanium dioxide precursor dispersed solution after being processed by the stannous salt solution, which is stirred, washed and dried, thus obtaining the noble metal supported catalyst. The method of the invention has no high requirements for preparation conditions which can be carried out under room temperature and atmospheric pressure and does not need heat and pressure; meanwhile, the raw materials adopted in the reaction have wide source and lower toxicity with the advantages of simplicity, economy, low energy consumption, convenient operation and convenience on realizing scale production.

The invention belongs to the chemical industry technical field and concretely provides a method of preparing for aromatic amine, alcohol or alkane by multi-phase catalytic hydrogenation transfer. The invention considers aromatic nitryl compound, aldehyde ketone and alkene compound as a substrate, hydrogenous polyatomic molecule as a hydrogen donor and loading type nano-gold as catalyst for reflux and stirring for the multi-phase catalytic hydrogenation transfer reaction under 80 DEG C to 200 DEG C and 0.4 to 0.6MPa to prepare for the aromatic amine, alcohol or alkane. The reaction condition of the method of the invention is gentle; the environment is friendly; the applied catalyst has high reaction activity and good selectivity.

A process for the continuous catalytic conversion of organic compounds, that, together with unwanted attendant materials, form a starting substance: first the organic compounds of the starting material are purposely extracted by means of condensed fluids. Then the extract, containing the condensed fluids and organic compounds as the reaction mixture is contacted with a catalyst for the catalytic conversion of the organic compounds to form a product mixture, which contains the individual products of the catalytic conversion. The product mixture is separated from the reaction mixture and the fluids employed are, optionally, conducted back for extraction.

The invention provides a method for preparing a high-selectivity Pd/TiO2-C hydrogenation catalyst, which comprises the following steps of: preparing an inorganic acid solution of a Pd-containing compound, and preparing an inorganic base solution of the Pd-containing compound; preparing a suspension solution of TiO2-C powder; adding the inorganic acid solution of the Pd-containing compound into the suspension solution of TiO2-C powder, regulating the pH value of the suspension to be 2-4, and standing for 0.01-1 hour; adding the inorganic base solution until the pH value reaches 8-12, and standing for 0.01-1 hour; adding the inorganic acid solution of the Pd-containing compound, regulating the pH value of the suspension to be 2-4, and standing for 0.01-1 hour, thereby finishing one PH swing; repeating the processes for 1-10 times; and then, reducing the suspension by a reducer to obtain the Pd/TiO2-C hydrogenation catalyst in which the Pd content is 1.1-20%. The Pd/TiO2-C hydrogenation catalyst prepared by the method provided by the invention has high hydrogenation conversion rate and high selectivity.

A method of reducing vulcanized rubber is provided. The method comprises the steps of heating the rubber, wherein the rubber includes synthetic rubber, in the presence of a solvent, wherein the solvent includes water to a temperature below a critical temperature of the solvent, providing a pressure that is at least equal to a saturated vapour pressure of the solvent at the temperature and maintaining the temperature and the pressure for a time sufficient to devulcanize the rubber and produce a reaction product that is primarily a solid phase and includes rubber hydrocarbon.

The production process includes reduction, filtering, washing, sieving, filtering and drying steps. In the reduction inside the reduction reactor with paddle stirrer, iron powder, water and reacted medium are heated with steam for 0.5-1 hr to activate, organic material is dropped continuously, iron powder, water and reacted medium are replenished intermittently to maintain the proper material ratio, and the suspension of organic product and iron mud is discharged continuously from the discharge port. The present invention is one continuous production process with low material consumption and high resource utilization.

The invention relates to application of a supported palladium catalyst in selective hydrogenation reaction. The supported palladium catalyst takes Pd as an active ingredient and takes a mesoporous molecular sieve MCM-41 as a carrier, and the nano-particles of the active ingredient Pd are dispersed on the surface and/ or porthole of the carrier. A research finds that in the supported catalyst which takes Pd as the active ingredient and takes the mesoporous molecular sieve MCM-41 as the carrier, the catalyst activity and/ or selectivity is obviously superior to that of Pd/MCM-41 catalyst which does not have the characteristic when the nano-particles of the active ingredient Pd are dispersed on the surface and/ or porthole of the carrier, and the application especially aims at the selective hydrogenation reaction of unsaturated hydrocarbons, alpha, beta-unsaturated aldehydes and halogenated nitrobenzene compounds.

The present invention relates to a loaded-type palladium/carbon catalyst preparation method, which mainly solves the problems in prior art that in the prepared Pd/C catalyst, the dispersibility of metal Pd is low; a crystallite content of which is low; the thermal stability is bad, and the transformation rate towards carboxyl benzaldehyde is low. The present invention solves the problems well by a technical proposal that activated carbon is adopted as a carrier; the Pd solution is used to soak or spray on the activated carbon to make the activated carbon into palladium/carbon, in which the Pd solution is added with R1, R2 or R3, which are all selected from one of H, CH3, NH2, OH or COOH, and n or m, which are all selected from an integer from 0 to 5. The present invention can be used for the industrial production of the catalyst towards methyl benzoic acid, which is prepared by a selective hydrogenation reaction towards the carboxyl benzaldehyde.