194 results about "Deposition precipitation" patented technology

The invention discloses a catalyst for preparing 1, 4-butynediol and a preparation method of the catalyst for preparing 1, 4-butynediol. According to the method, acidized nano-silica is adopted as a carrier, the adopted nano-silica has a large outer specific surface, a dipping method and a deposition-precipitation method are used for adsorbing copper and bismuth on the carrier, so that the catalyst comprises 35-65% of copper oxide by mass, and meanwhile silica sol is added, so that the catalyst is more stable and abrasion resistant. The prepared catalyst is good in activity, high in selectivity and strength, not prone to pulverizing in the process of using and capable of keeping high activity.

The invention provides an oxidation catalyst to purify CO in room temperature, which is prepared in coprecipitation method or deposition-precipitation method. The catalyst consists of non precious metal active components and carrier, wherein the loading of the active components is 5 to 80 percent of the conversion value of metal element. The active components come from cobalt salt liquid, iron salt liquid, nickel salt liquid, manganese salt liquid, copper salt liquid, zinc salt liquid, tin salt liquid and cerium salt liquid. The carrier comes from alumina, silica, molecular sieve, honeycomb ceramics, wire fence, cobalt oxide, iron oxide, manganese oxide, copper oxide, zinc oxide, tin oxide and cerium oxide. The precipitant is Na₂CO₃, K₂CO₃, sodium hydroxide, urea or ammonia. The catalyst preparation solution needs to be fully stirred for 1 to 8 hours and the retrogradation duration is 1 to 16 hours. The dried solution needs to be treated in in-situ remediation in air, oxygen, and hydrogen or nitrogen atmosphere in temperature from 100 to 500 degrees centigrade. The catalyst disuses precious metal as active component, so the cost is low and the preparation process is simple.

The invention discloses a high stability catalyst used for oxidizing nano-Au by CO at room temperature and a preparation method thereof. The catalytic active component of the catalyst is Au or alloy formed by Au and noble metal Rh (or Pt). The carrier is TiO2 or TiO2 modified by rare earth, wherein, the rare earth is one or more than one of Ce, La, Ho, Dy and Tm. The preparation of the catalyst is divided into two steps: the sol-gel method is adopted to prepare TiO2 and carrier material of TiO2(Re-TiO2) modified by rare earth; then Re-TiO2 is taken as the carrier, the deposition-precipitation method is adopted to prepare a Au-Rh(or Pt)/Re-TiO2 catalyst. The catalyst of the invention has very high stability and can catalyze CO to lead to the complete conversion at room temperature. The activity of the catalyst remains the same after the catalyst is used for 1,000 hours.

The invention provides a catalyst for synthesizing ethylene glycol by oxalate hydrogenation, and a preparation method and an application method of the catalyst. The preparation method comprises the steps of taking copper nitrate and copper acetate as copper sources, taking alkaline silica gel as a silicon source, and taking urea and ammonia water as a precipitant; adding a multi-hydroxyl organic matter; and preparing a Cu/SiO2 catalyst with a deposition-precipitation method. According to the method, the dimension and dispersity of copper species are adjusted and controlled by adding the multi-hydroxyl organic matter in the preparation process, and the aggregation of the copper species is inhibited by utilizing carbon deposition, so that the problem of easy sintering of the copper species at a high temperature is better solved. The application method for applying the catalyst to the synthesis of ethylene glycol by oxalate hydrogenation comprises the steps of firstly enabling the organic matter on the catalyst to form the carbon deposition at a relatively high temperature in an inert atmosphere; secondly switching inert gas to hydrogen in a cooling process after carbon deposition formation; and finally when the temperature is reduced to a reaction temperature, performing subsequent hydrogenation synthesis. The method has the characteristics that the catalyst does not need to be pre-roasted before use, and hydrogen pre-reduction does not need to be carried out for a long time, so that the preparation and use costs of the catalyst can be reduced.

The invention provides a ruthenium supported perovskite-type-oxide ammonia synthesis catalyst and a preparation method thereof, and belongs to the field of fertilizer catalysts. The ammonia synthesis catalyst comprises a perovskite-type BaZrO3 carrier and a ruthenium metal active ingredient, wherein the BaZrO3 carrier is prepared from barium salt and zircon salt by an organics complex-combustion method; and the ruthenium active ingredient takes K2RuO4 as a precursor, and the loading quantity is 2 to 10 percent of the weight of the carrier based on the weight of ruthenium (Ru); and the Ru is loaded on the BaZrO3 carrier by an isovolumetric impregnation method or a deposition precipitation method. The preparation method is simple and convenient, equipment is simple, and the prepared catalyst has the advantages of high low-temperature low-pressure activity, stable performance and the like, and has obvious economic and social benefits.

The invention discloses a method for preparing carbon-coated nickel nano-particle enhanced silver-base composite material and relates to manufacturing of silver-base alloy. The method comprises the following steps: step one, the precursor NiO plus Ag2O of Ni plus Ag catalyst is prepared by a deposition-precipitation method; step two, carbon-coated nickel nano-particles plus silver in-situ composite powder are prepared by a chemical vapor deposition method; and step three, the carbon-coated nickel nano-particle enhanced silver based composite material is prepared. The method not only has simple technical process and low cost, avoids introducing foreign pollutant in every process of preparation technology but also overcomes the defects of non-uniform dispersion of the reinforced phase. The carbon-coated nickel nano-particle enhanced silver-base composite material prepared by the method has good electric property, comprehensive mechanical property and wearing resistance.

The invention discloses a preparation method of a graphene supported ferriferrous oxide nanocomposite, comprising the following steps: preparing a precursor by deposition precipitation method, depositing ferric nitrate ninehydrate or ferric chloride hexahydrate on graphene in the form of iron hydroxide by using sodium hydroxide or ammonia to obtain black powder, washing and drying the obtained black powder, grinding the dried black powder, then calcining under the protection of argon, and then cooling, and reducing under the protection of a mixed gas of argon and hydrogen or argon and ammonia gas to obtain the graphene supported ferriferrous oxide nanocomposite. The preparation method is simple and stable. In the obtained composite, ferriferrous oxide is uniformly distributed on graphene and has good interface combination of the substrate graphene, thus the absorbing properties and the like of the composite as a functional material can be improved. The method also can be used for preparing carbon material supported ferriferrous oxide nanocomposites with different substrates by using carbon nanotube, graphite oxide and other carbon materials as the substrate.

The invention belongs to the chemical technical field and particularly relates to a supported nano Au catalyst for preparing crotyl alcohol by crotonic aldehyde selective hydrogenation and a preparation method thereof. The catalyst is prepared by using mesoporous titanium dioxide microballoons having core-shell structures as the carrier and loading the active constituents, nano Au, to the titanium dioxide microballoons by the deposition-precipitation method. The catalyst has the characteristics that the active constituents are highly dispersed, and the mol ratio of the titanium dioxide to the active constituents is 23.0-305.7. Compared with the nano Au catalyst supported by the commercial titanium dioxide carrier P25, the Au/TiO2 microspherical catalyst shows higher selectivity of target products in the reaction of preparing crotyl alcohol by crotonic aldehyde selective hydrogenation, thereby having important industrial application value.

The invention discloses a preparation method of a catalyst for synthesizing ethyl acetate, which comprises the following steps: (1) meso-porous Upsilon -Al2O3 is adopted as substrate supporter, nano-sized ZrO2 is synthesized on the substrate supporter by the deposition-precipitation method directly to prepare loaded nano-sized Zro2/ Upsilon -Al2O3 composite carrier, (2) SO4 <-2> is carried by the composite carrier to prepare solid acid catalyst SO4<-2>/ZrO2/ Upsilon -Al2O3, (3) ethyl acetate is synthesized, which adopts acetic acid, ethanol and SO4<-2>/ZrO2/ Upsilon -Al2O3 as material, and (4) the transformation rate of acetic acid is above 95%, and the yield of ethyl acetate is above 90%. The catalyst for synthesizing ethyl acetate has the advantages of low cost, no environment and equipment pollution, high activity, and high selectivity and stability.

The invention discloses a catalyst for decomposing nitrous oxide and a preparation method of the catalyst. The catalyst is prepared by the deposition precipitation method. The method comprises the processes of preparing a deposit, washing, forming a deposit, activating through the catalyst, etc.; the catalyst comprises active ingredients, a carrier which is zirconium oxide, and additives, wherein the active ingredients include one or more than two of Co, Ni, Fe and Mn; the additives include one or more of cerium oxide, lanthanum oxide and barium oxide. A catalyst activity experiment shows that nitrous oxide can be completely catalytically decomposed into nitrogen and oxygen at the temperature ranging from 450 to 700 DEG C; therefore, the activation temperature is low, and the T50 (reaction temperature under conversion rate of 50%) is about 350 DEG C. The catalyst is high in activity and outstanding in heat resistance, has a wide operation window, and enables the concentration of nitrous oxide in industrial waste gas to be greatly reduced, and therefore, the environmental pollution is decreased; the catalyst is particularly suitable for N2O removal of a nitric plant and an adipic acid plant.

The invention relates to a Cu/TiO2-NB nano porous ceramic film, and a preparation method and an application of the nano porous ceramic film. The nano porous ceramic film is a hydrophilic porous ceramic film. The preparation method comprises the steps of synthesizing a titanic acid nanoribbon by a hydrothermal method, loading a metal copper nano particle on the surface of the titanic acid nanoribbon by a deposition-precipitation method, and finally tabletting and roasting a quantitative Cu/TiO2 nanoribbon. According to the nano porous ceramic film with the copper nano particle coupled with the TiO2 nanoribbon, loading of the copper nano particle improves absorption of TiO2 to visible light; the visible light catalytic activity of TiO2 is further improved; the nano porous ceramic film has sterilization and separation functions; and improvement and stabilization of produced water quality are facilitated.

The invention relates to a preparation method of a p-n type nano CuO/alpha-Fe2O3 composite semiconductor material, and the material is applied to the field of gas sensors. Pure alpha-Fe2O3 is prepared by using a chemical precipitation method; and the nano CuO/alpha-Fe2O3 composite semiconductor material is further prepared by using a deposition-precipitation method. The CuO/alpha-Fe2O3 composite semiconductor gas sensitive material provided by the invention is simple in preparation technique, low in equipment requirement and low in cost; according to the prepared gas sensitive material, along with the increase of the CuO content, Cu atoms gradually enter alpha-Fe2O3 crystal phases, and the particle sizes of special grains range from 10nm to 20nm. By utilizing the prepared material, effective detection on hydrogen sulfide at room temperature is realized, and the material can rapidly respond to carbon monoxide at both 50 DEG C and 100 DEG C, so that the material has large application prospects.

Disclosed is a supported nanoparticle catalyst, methods of making the supported nanoparticle 5 catalysts and uses thereof. The supported nanoparticle catalyst includes catalytic metals M1, M2, M3, and a support material. M1 and M2 are different and are each selected from nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe), copper (Cu) or zinc (Zn), wherein M1 and M2 are dispersed in the support material. M3 is a noble metal deposited on the surface of the nanoparticle catalyst and/or dispersed in the support material. The nanoparticle catalyst is 10 capable of producing hydrogen (H2) and carbon monoxide (CO) from methane (CH4) and carbon dioxide (CO2).

The invention discloses a preparation method of an in-situ synthesized carbon nanotube reinforced Mg-matrix composite. The method comprises the following processes of: preparing a Co/Mg catalyst precursor by using a deposition-precipitation method; growing carbon nanotubes on the catalyst precursor by using a chemical vapor deposition method; performing ball-milling on the mixed powder of the in-situ synthesized carbon nanotubes and magnesium powder for a short time; pressing the ball-milled mixed powder, forming and sintering; and finally, applying a hot extrusion technology to obtain the in-situ synthesized carbon nanotube reinforced Mg-matrix composite. The preparation method is easy to operate in the preparation process and simple and stable in process; and the obtained carbon nanotubes are uniformly dispersed on the surface of the magnesium powder, so that the performance of the Mg-matrix composite is greatly improved. The prepared high-strength Mg-matrix composite can be widely applied to the fields such as aerospaces, automobiles and the like.

The invention discloses a hydrodeoxygenation isomerization catalyst, which includes a hydrodeoxygenation catalyst of an ultrastable Y molecular sieve loaded metal and a hydroisomerization catalyst of a molecular sieve loaded noble metal. The ultrastable Y molecular sieve has a microporous-mesoporous composite pore system, and the metal selected from Zn, Ni and Cu is loaded by means of deposition precipitation so as to obtain the hydrodeoxygenation catalyst. The hydroisomerization catalyst adopts the microporous molecular sieve SAOP-11, SAPO-31, SAPO-34, HZSM-5, HZSM-22 or HBEA as the carrier, and the noble metal selected from Pt, Pd and Ru are loaded on the molecular sieve through impregnation method, thus obtaining the hydroisomerization catalyst. The invention also puts forward application of the hydrodeoxygenation isomerization catalyst in preparation of high cetane number diesel oil from illegal cooking oil. The mixed catalyst has high activity and anti-carbon deposition capacity, and the obtained diesel oil product has the advantages of high cetane number and low freezing point.

The invention relates to application of a supported gold cluster catalyst to selective hydrogenation of an aromatic nitrocompound. A preparation method for the catalyst comprises the following steps: with a biological reagent containing mercaptan as a protective agent, preparing a precursor containing a gold cluster in advance; then impregnating a carrier with the precursor; and carrying out drying and roasting at a certain temperature so as to obtain the catalyst which can be directly applied to selective hydrogenation of the aromatic nitrocompound. The catalyst shows excellent activity and selectivity under mild reaction conditions; and compared with supported gold catalysts prepared by using a coprecipitation or deposition-precipitation method, the catalyst prepared in the invention is substantially advantaged in activity and selectivity.

A process for preparing Al2O3 aerogel carried catalyst includes such steps as preparing Al(OH)3 gel, depositing active component to Al(OH)3 gel by deposition-precipitation method, supercritical drying in high-pressure reactor and calcining. A process for preparing nano carbon tubes by catalytic cracking of methane with said catalyst is also disclosed. The resulant nano carbon tube features small diameter, easily controllable form and simple preparing process.

The invention discloses a method for preparing a monatomic catalyst capable of degrading formaldehyde under an oxygen condition and at normal temperature. The method comprises the following steps of 1, conducting hydrogen gas reduction to obtain a defective TiO2 carrier with surface oxygen vacancy; 2, utilizing a deposition-precipitation method for preparing a precipitate Au/defective TiO2; 3, conducting drying and calcining to obtain the final product monatomic Au/defective TiO2 catalyst. Compared with an existing catalyst, the method has the advantages that the catalyst Au/defective TiO2 ishigh in efficiency and long in service life, and the monatomic catalyst has strong poison tolerance, and has great advantages in a formaldehyde degrading reaction; the Au/defective TiO2 monatomic catalyst is adopted, dispersion of metal atoms is facilitated through the construction of defects, and normal-temperature catalytic oxidation under the O2 condition and without the assistance of ozone canbe achieved.

The invention discloses a supported bimetallic reforming catalyst and a preparation method and an application thereof. The catalyst is characterized in that active components metallic nickel and metallic cobalt are supported on an oxide carrier, wherein the mass ratio of the oxide carrier to metallic nickel to metallic cobalt is 1: 0.01-0.1: 0.01-0.1; and the oxide carrier is one of magnesium oxide, alumina, silica, cerium oxide and zirconia. The preparation method is characterized in that a deposition-precipitation method is employed, a precipitating agent is slowly added in a solution of the oxide carrier, metallic nickel and metallic cobalt, a reaction is carried out, and steps of pumping filtration, washing, drying and calcining are carried out to obtain the catalyst. The catalyst solves the problems of poor anti-carbon formation capability, complex preparation method and high catalyst cost in the prior art. The whole preparation has the advantages of simple process, convenient operation, and easy control of the synthesis condition, and the prepared catalyst has high catalytic activity and anti-carbon formation performance.

The invention relates to a formaldehyde room temperature purification nano-palladium-loaded nano cerium oxide catalyst. A nano cerium oxide cubic block is used as a carrier, and the surface of the carrier is loaded with the nano palladium by deposition-precipitation method to obtain the loaded type catalyst. The formaldehyde room temperature purification loaded type catalyst can convert most or all of the formaldehyde under the condition of room temperature into carbon dioxide and water without production of by-product of formic acid, carbon monoxide, and the like, and the formaldehyde conversion rate is up to 100%.

The invention discloses a copper-based catalyst for dimethyl oxalate hydrogenation as well as a preparation method and an application of the copper-based catalyst. Soluble copper salt is supported tomesoporous silica nanospheres with central radial pore channels with a deposition-precipitation method; copper in the prepared catalyst accounts for 10%-45% of total weight of the catalyst, and monovalent copper accounts for 10-60mol% of total active copper; the catalyst has the specific surface area larger than 500 m<2>/g, the pore volume higher than 1.0 ml/g and the average mesoporous size being2.8-10 nm. With the adoption of the preparation method of the catalyst, size and dispersity of copper in the final catalyst can be regulated, the synergistic effect of monovalent copper and zero-valent copper is improved, and the high-dispersity supported nano-copper metal catalyst is obtained; when the catalyst is used for dimethyl oxalate hydrogenation for synthesizing ethylene glycol, conversion rate of dimethyl oxalate is higher than 99%, selectivity of ethylene glycol is higher than 96%, the preparation process of the catalyst is simple, the cost is low, and industrial application can berealized.

The invention discloses a catalyst for production of propylene oxide through gas-phase epoxidation of propylene and a preparation method thereof, and relates to a catalyst for production of propylene and a preparation method thereof. The invention provides a catalyst for production of propylene oxide through gas-phase epoxidation of propylene and a preparation method thereof. The catalyst is composed of mAu/Ti-HMS, wherein m represents the mass percentage of Au in the catalyst. According to mass percentage, titanium-silicon solid oxide accounts for 96.0 to 99.7 percent of the catalyst and the Au accounts for 0.3 to 0.4 percent of the catalyst. The molar ratio of silicon to titanium in the titanium-silicon solid oxide is between 5 and 80. A mixed solution of tetra-n-butyl titanate or tetra-iso-propyl-titanate and tetraethyoxysilane is prepared to form a Ti-HMS carrier in the presence of a structure-directing agent of organic primary amine by a sol-gel method, a chloroauric acid compound is loaded on the carrier though impregnation by a deposition precipitation method to obtain a Ti-HMS carried gold catalyst. The catalyst obtained has high catalytic and hydrogen efficiency under a mild reaction condition without the presence of any dressing agent and assistant and is renewable.

The invention discloses a catalyst with ruthenium-loaded titanium dioxide hollow spheres embedded with silicon dioxide nanoparticles and a preparation method and application of the catalyst. The preparation method includes: using tetraethyl silicate as the raw material to prepare silicon dioxide microspheres; using titanium tetraisopropanolate to wrap the silicon dioxide microspheres with a layerof titanium dioxide and surfactant hexadecylamine, processing the product in an ammonia water solution through a hydrothermal method to partially etch the silicon dioxide microspheres inside so as toform cavities between the shell titanium dioxide and the inside silicon dioxide, and calcining under certain temperature and removing the surfactant to form crystal-form titanium dioxide; using a deposition-precipitation method to load precious metal ruthenium of different content. The catalyst has a special mesoporous spherical structure and large specific surface area and has high conversion rate and selectivity to guaiacol and other biomass phenol hydrogenation. The preparation method is easy to operate, simple in production process, low in equipment requirement and promising in industrialapplication prospect.

Belonging to the technical field of catalysts, the invention relates to a method for use of a modified molecular sieve catalyst in catalytic cracking of propane. The method is characterized by subjecting a molecular sieve to a full negative pressure degassing purification treatment, and then loading a gold precursor onto a molecular sieve carrier by a negative pressure deposition-precipitation technique, thus obtaining a uniform and highly disperse granule loaded nanogold catalyst. The molecular sieve refers to a high-silicon zeolite molecular sieve. Preparation of the loaded gold catalyst through the deposition-precipitation technique under a negative pressure condition is in favor of purifying the inner and outer surfaces of the molecular sieve and pore channels, so that Au can be easy to enter the pore channels of the molecular sieve and high dispersion can be achieved. The method provided in the invention can make propane undergo dehydrogenation to produce olefin under the difunctional actions of the metal and the carrier. The olefin can acquire protons at an acid site to form carbonium ions, which then undergo polymerization cracking to generate corresponding olefin.