58 results about "Porous catalyst" patented technology

The application discloses a self-heat maintaining type catalytic purification device for VOCs pollutants in a port, which comprises an air inlet pipe, an air outlet pipe, a purification cylinder, a catalytic pipe and an air inlet partition plate. The catalytic pipe is located on the axis of the purification cylinder and divides the purification cylinder into a central axis space and an outer ring space. The central axis space and the outer ring space are communicated at the first end of the purification cylinder. The catalytic pipe is internally provided with a whole porous catalyst. The air inlet pipe is communicated with the outer ring space at the second end of the purification cylinder, and the air outlet pipe is communicated with the central axis space at the second end of the purification cylinder. The air inlet partition plate is arranged between the purification cylinder and the catalytic pipe. The self-heat maintenance of catalytic oxidation reaction can be realized. After the device is started, continuous electric heating or external energy supply is not needed for heating and maintaining the high temperature of the device, energy waste is reduced, and the safety hidden danger caused by high-temperature operation is reduced.

The application belongs to the technical field of organic ester, and particularly relates to a Ti / Zr-Si porous catalyst, a preparation method thereof and a catalytic esterification method. The application introduces an organic acid source in a system for preparing a molecular sieve, and a core-shell type heterogeneous esterification catalyst material with titanium / zirconium in a tetra-coordination framework as a core and titanium / zirconium in a penta / six-coordination as a shell is prepared by combining the porous molecular sieve with a binder precursor. The catalyst contains abundant secondary pores in the molecular sieve crystals and between the binders, which effectively improves the esterification reaction performance and activity stability of the catalyst.

The present disclosure relates to a porous catalyst including an oxide matrix structure having mesopores and micropores, and metal nanoparticles embedded in the oxide matrix structure, wherein the metal nanoparticles of the porous catalyst have residual compressive stress.

The invention discloses a porous catalyst based on a biomineralization template, a composite catalytic membrane and preparation and application thereof, and the porous catalyst is prepared by the following method: adding a metal chloride into a transition metal salt solution, then adding the biomineralization template, and stirring in a water bath for reaction; after the reaction is finished, performing suction filtration and drying, and grinding to obtain solid powder; wherein the biomineralization template is selected from one or two of waste pearls and shells; and fully calcining the solid powder in an air or nitrogen atmosphere, naturally cooling the solid powder to room temperature, and washing and drying the solid powder to obtain the porous catalyst based on the biomineralization template. According to the porous catalyst based on the biomineralization template, the magnesium oxide or zinc oxide loaded Co or Cu porous catalyst is synthesized through high-temperature conversion and washing of the biological template, and the performance efficiency of degrading organic pollutants can be improved. The method adopts simple dipping and calcining methods for preparation, and the process flow is short.

A method for preparing a supported transition metal catalyst, and the supported transition metal catalyst and use thereof in condensation coupling synthesis of a high-carbon ketone from an α-H-containing ketone and an alcohol are provided. Preparation process of the supported transition metal catalyst includes adding a porous catalyst carrier to a solution of a transition metal salts, followed by standing, drying, calcining, and reducing. The transition metal salt is at least one selected from the group consisting of transition metal nitrates, transition metal formates, transition metal oxalates, and transition metal acetates, and the transition metal is a non-noble metal selected from the group consisting of transition metal elements from Groups VIIB, VIII, IB and IIB of the periodic table of the chemical elements.

Porous catalyst support and methods for producing same are provided herein. An example porous catalyst support includes a porous material defining a plurality of pores, wherein the porous material comprises a porous carbon material, the plurality of pores comprises a plurality of micropores and a plurality of mesopores, and a porosity of the porous catalyst has a predetermined volume of micropores and of mesopores.

The invention provides a porous catalyst as well as a preparation method and application thereof, and belongs to the field of catalysts. The preparation method of the porous catalyst provided by the invention comprises the following steps: carrying out first mixing on slag and an acid solution, and filtering to obtain a metal ion filtrate; the acid solution is a mixed solution of diluted hydrochloric acid and diluted acetic acid; performing second mixing on the metal ion filtrate and an oxidizing agent to obtain a high-valence metal ion solution; thirdly mixing the high-valence metal ion solution, a precipitator and carbon powder, and performing hydrothermal reaction to obtain a catalyst precursor; and carrying out oxygen-enriched roasting on the catalyst precursor to obtain the porous catalyst. The working temperature of the porous catalyst obtained by the preparation method provided by the invention is 160-450 DEG C, the removal efficiency of SO2 and NOx reaches 100%, the service life reaches 130 h or more, the porous catalyst has a wide working temperature interval and a relatively long service life, and simultaneous desulfurization and denitrification at a relatively low reaction temperature can be realized.

The present application relates to solid catalyst production technical field, disclose a kind of porous catalyst mould support frame, including support frame main body, the support frame main body is installed in the circular mould hole on mould disc, the plane where the upper end opening of the mould hole is higher than the top surface of support frame main body, mould ring sleeve is equipped in the mould hole, the support frame main body is located at the top of mould ring sleeve, the support frame main body center is equipped with the hole needle matched with catalyst pore number, the hole needle extends into the forming cavity of mould ring sleeve, a plurality of inflow holes for inflowing material to forming cavity are evenly distributed outside the hole needle.The present application blocks the material entering mould hole by support frame main body, so that the material is evenly flowed into the forming cavity of mould ring sleeve by a plurality of inflow holes on the top of support frame main body, ensures the uniformity of material distribution in forming cavity during catalyst forming process, so that the density of the catalyst after forming is consistent, greatly improves the overall quality of catalyst product.

The present application relates to cinnamyl aldehyde selective hydrogenation technical field, specifically to a kind of Pt nanoparticle supported porous SiC catalyst and its application in cinnamyl aldehyde hydrogenation reaction.The selectivity of cinnamyl alcohol is lower in conventional cinnamyl aldehyde selective hydrogenation reaction, it is difficult to reach more than 90%.For the above technical problem, the present application provides a kind of Pt nanoparticle supported porous SiC catalyst, mainly utilizes acid etching method to carry out porous modification to polycrystalline SiC, by adjusting the Si / C ratio of its surface to enhance the hydrogen overflow concentration of the obtained catalyst Pt / SiC surface, Pt nanoparticle in the channel of catalyst can preferentially adsorb C=O bond in reaction and make it active, so as to realize the high activity of the obtained catalyst in cinnamyl aldehyde hydrogenation reaction and the high selectivity of cinnamyl alcohol product.

The invention relates to the technical field of membrane separation, and particularly discloses a high-entropy metal hollow composite fiber membrane and application thereof in hydrogen production from raw gas. The high-entropy metal hollow composite fiber membrane comprises a porous catalyst layer and an outer separation layer attached to the outer surface of the porous catalyst layer. Wherein the material of the porous catalyst layer comprises a first high-entropy alloy material and a composite additive, and the composite additive comprises an active additive, a sulfur-resistant agent and a catalytic additive; and the material of the outer separation layer comprises a second high-entropy alloy material. According to the invention, hydrogen is generated from raw gas reforming impurities by using the porous catalyst layer, and then ultra-pure hydrogen with the purity of 99.999% or more is obtained through separation of the outer separation layer, so that the combination of the two effectively solves the problem of high tar and high sulfur characteristic impurities in the existing process of preparing hydrogen from raw gas, simplifies a purification system, reduces energy consumption and cost, and improves the production efficiency. And the method has obvious economic benefits.

The present application relates to the technical field of catalyst, in particular to a catalyst for synergistically catalyzing CO and NO and a preparation method thereof. x The catalyst is prepared by the method. The method comprises adding ammonium metavanadate into ethanolamine, stirring and dissolving to obtain a first mixed solution; uniformly mixing and dissolving 1,3,5-benzene tricarboxylic acid, water and an iron salt to obtain a second mixed solution; uniformly mixing the second mixed solution and the first mixed solution to form a mixture; performing a first reaction treatment on the mixture under a closed condition to obtain a carbon three-dimensional network structure loaded with iron and vanadium; performing a first drying treatment and a first calcination treatment under an inert atmosphere on the carbon three-dimensional network structure to obtain a cage-shaped porous carbon structure loaded with iron and vanadium; adding the cage-shaped porous carbon structure and a copper salt into water, performing a heating and stirring treatment, and then performing a second drying treatment and a second calcination treatment to obtain a porous catalyst loaded with copper, iron and vanadium. The present application can prepare a porous catalyst for synergistically catalyzing the removal of CO and NO. x ​

The present application relates to a kind of desulfurization denitration porous catalyst, catalyst with manganese oxide MO as the porous carrier of denitration, and the porous carrier provides loading site for active desulfurization catalyst vanadium oxide and cerium oxide.Catalyst is expressed as MO / Ce,V, MO is obtained by high-temperature calcination of metal organic framework compound, select MO porous matrix, then by step-by-step solution method load CeO2 With V2O5 Desulfurization active area is divided, and higher desulfurization denitration conversion efficiency is obtained.

This invention relates to the field of porous materials technology, and in particular provides a method for constructing a nested network model of porous materials. The method includes: acquiring the three-dimensional morphology of the porous material; obtaining the solid 3D spatial position and size distribution information of the porous material's catalyst layer based on the 3D morphology, and obtaining the actual porosity of the catalyst layer; constructing a nested network model of the porous material's catalyst layer based on the 3D spatial position and size distribution information of the porous material using a regular network extraction method or an improved MS-RVT algorithm; using equations to describe the mass transport, charge transport, heat transport, and electrochemical reaction processes in the nested network model; solving the equations to obtain the mass concentration of all pores, the temperature of all nodes, and the chemical reaction rate. This invention reflects the true microstructure of porous catalysts and can obtain the mass transport and reaction rate distribution throughout the entire catalyst region.

This invention relates to a supported single-atom catalyst, its preparation method, and its application in the conversion of n- and secondary hydrogens. The preparation method includes: mixing a salt solution containing a metal precursor with a porous catalyst support, ultrasonicating, drying, and calcining to obtain the supported single-atom catalyst. This catalyst preparation method is simple, highly reproducible, and easy to scale up, and exhibits high activity, high stability, and high mechanical strength in the catalytic conversion of n- and secondary hydrogens. Under conditions of 78 K, 2000 cc(H2) / min / g(catalyst), and 1 atm, the supported single-atom catalyst achieves a catalytic conversion efficiency of up to 93% for n- and secondary hydrogens.

The invention relates to the technical field of composite catalysts, in particular to a defect-state porous TiO2 catalyst as well as a preparation method and application thereof. The technical key points are as follows: the defect-state porous TiO2 catalyst is of a hexagonal hollow structure, the diameter is 150-250 nm, the hollow diameter is 40-60 nm, and the defect-state porous TiO2 catalyst is in an anatase crystal form and is used for catalyzing synthesis of polyethylene furandicarboxylate. According to the preparation method disclosed by the invention, a three-step core process of nano-scale silicalite-1 molecular sieve hard template synthesis, precise alkali etching and hydrogen atmosphere calcination is adopted, the anatase phase defect state porous TiO2 catalyst with a regular hexagonal hollow structure and a pure crystal form is successfully prepared, and deep synergy of structural design and catalytic performance is realized.

The invention relates to the technical field of porous materials, in particular to a method for constructing a nested network model of a porous material, which comprises the following steps: acquiring the three-dimensional shape of the porous material, acquiring the solid 3D spatial position and size distribution information of a catalyst layer of the porous material according to the three-dimensional shape of the porous material, and acquiring the actual porosity of the catalyst layer; based on the 3D spatial position and size distribution information of the porous material, constructing a nested network model of a porous material catalyst layer through a regular network extraction method or an improved MS-RVT algorithm; and adopting an equation to describe the material transfer, charge transfer, heat transfer and electrochemical reaction processes in the nested network model, solving the equation, and obtaining the material concentration of all pores, the temperature of all nodes and the chemical reaction rate. By adopting the method, the real microstructure of the porous catalyst can be reflected, and the material transmission and reaction rate distribution in the whole catalyst area can be obtained.

The invention belongs to the technical field of new materials, and discloses a low-cost porous catalyst as well as a preparation method and application thereof. The preparation method of the porous catalyst comprises the following steps: dissolving soluble zinc salt in water to prepare a solution A; 2-methylimidazole, metal phthalocyanine and a nano inorganic oxide template are dissolved in water, and a solution B is prepared; mixing the solution A and the solution B to prepare a mixed solution; centrifuging and drying the mixed solution, and then carrying out heat treatment; and finally, carrying out acid pickling and drying on a product subjected to heat treatment. The porous catalyst prepared by replacing a traditional organic solvent with water has a relatively high specific surface area and a rich porous structure, and transition metal has good dispersion performance and exists in a monodisperse form with a high atom utilization rate, so that the atom utilization rate is greatly improved, and the activity of the catalyst is improved; and excellent oxygen reduction performance is shown in an acidic electrolyte.

The invention provides a catalyst for oxidative removal of low-temperature carbon monoxide and volatile organic compounds as well as a preparation method and a use method of the catalyst. The catalyst comprises a porous catalyst carrier and active components loaded on the porous catalyst carrier, wherein the active components comprise noble metals and at least one or a combination of transition metals and catalytic promoters; wherein the mass ratio of the transition metal to the noble metal is (0-10): 1, the mass ratio of the catalytic promoter to the noble metal is (0-10): 1, and the mass content of the noble metal is 0.1-10% on the basis of the total mass of the catalyst. The catalyst has high catalytic activity and is suitable for low-temperature oxidation removal of carbon monoxide (CO) and volatile organic compounds (VOC) in various application scenes.

This invention provides a method for preparing a porous catalyst gas diffusion electrode by magnetron sputtering and the electrode itself, belonging to the field of water electrolysis technology. The method includes: providing an anode diffusion layer as a substrate; using a first element and a second element as dual targets, wherein the first element belongs to at least one element in Group VIII and the second element belongs to at least one transition element; evacuating the magnetron sputtering environment to a first pressure, introducing argon gas, and then adjusting the pressure to a second pressure; alternately sputtering the first element as the first target and the second element as the second target on the anode diffusion layer to form a heterojunction or alloy layer; performing pore-forming treatment on the heterojunction or alloy layer, cleaning, calcining, and cooling to obtain the porous catalyst gas diffusion electrode. This invention uses magnetron sputtering to prepare a porous catalyst gas diffusion electrode, preventing the catalyst from easily detaching from the proton exchange membrane, thus improving the catalyst activity and consequently the activity of the membrane electrode.

The invention provides a catalyst reaction process monitoring method and system, and belongs to the technical field of infrared temperature measurement, and the method comprises the steps: obtaining a single-frame image of porous catalyst thermal imaging, carrying out the channel recognition and segmentation of the single-frame image, and determining multi-channel regions of different structures; the method comprises the following steps: sequentially acquiring porous catalyst thermal imaging infrared images according to preset acquisition time, taking a previous frame of image as a reference frame, acquiring a global extreme value of each pore channel region of a current frame and the reference frame as a temperature difference characteristic index, and determining a temperature difference matrix of each pore channel region of the current frame and the reference frame according to the temperature difference characteristic index; based on the temperature difference matrix of each pore channel area, converting the temperature difference matrix into a high-contrast heat map; and sequentially outputting the high-contrast heat map of each frame according to the acquisition time sequence, and forming an evolution thermodynamic diagram of each pore channel region, the temperature difference of each pore channel region and the temperature change rate. The monitoring method can automatically track the reaction front edge or analyze the dynamic process that the temperature changes along with time.

The present application relates to a manufacturing process for a supported transition metal catalyst, a supported transition metal catalyst, and its use in the synthesis of high-carbon ketones by acyloin condensation of α-hydrogen-containing ketones and alcohols. The manufacturing process of the supported transition metal catalyst comprises adding a porous catalyst support to a solution of a transition metal salt, dissolving, standing, drying, calcining, and reducing. The transition metal salt is selected from one or more of the transition metal nitrate, transition metal formate, transition metal oxalate, and transition metal acetate. The transition metal is selected from the transition metal elements of Group VIIB, VIII, IB, or IIB, and the transition metal is not a non-precious metal. The raw materials for the catalyst according to the present application are readily available and inexpensive to produce.The acyloin condensation of α-hydrogen-containing ketones and low-molecular-weight alcohols allows for the highly selective production of desired high-carbon ketones without the need for solvents or hydrogen sources during the reaction. The catalyst is also stable under long-term operating conditions and therefore has good prospects for industrial applications.

The application relates to the technical field of catalysts, and discloses a modified bimetallic catalyst and a preparation method and application thereof, the preparation method of the modified bimetallic catalyst comprises the following steps: adding a niobium compound, a template agent, a titanium compound and carbon balls into a solvent to obtain a mixed solution; then adding an amino precipitate into the mixed solution to carry out reaction, and obtaining a crude product after calcination; then reacting the crude product with an amino modification solution, and obtaining the product after drying; on the one hand, the titanium compound is added to modify the niobium-based catalyst, chemical action occurs between the two kinds of metals, and the catalytic activity is enhanced; on the other hand, the hollow porous catalyst is prepared by using the double-template combination and the hydrothermal method, transmission channels are provided for macromolecular sulfides, and the adsorption and diffusion processes in the pore channel are accelerated; meanwhile, after the amino modification, the catalyst surface is rich in amino groups and the hydroxyl group polarity is enhanced, the catalyst can directly adsorb the sulfone substances generated in the desulfurization process, and low-temperature and high-efficiency desulfurization is realized.

Provided is a hydrogenation method that can finish in less time, i.e., a hydrogenation method in which a hydrogenation reaction can finish in less time due to an improvement in the reaction rate of the hydrogenation reaction. One aspect of the present invention provides a method for producing a hydrogenated polymer by hydrogenation of an aromatic ring of an aromatic vinyl compound polymer, said method comprising performing a hydrogenation reaction using an aromatic vinyl compound polymer, a solvent, and a hydrogenation catalyst, wherein the hydrogenation catalyst is a porous catalyst, and the total volume of pores having a pore diameter of 50-300 Å in the porous catalyst is 0.17-1.00 mL / g.

The present invention relates to a metallic nanoparticle catalyst, and more particularly, to a porous catalyst in which metallic nanoparticles are embedded in a porous oxide support, and a method for preparing the porous catalyst. To this end, a porous catalyst composition having metallic nanoparticles of the present invention includes an oxide matrix structure having mesopores and micropores; and metal or metal oxide nanoparticles embedded in the oxide matrix structure having the mesopores and micropores. Thus, metallic nanoparticle catalysts having high activity even at low temperature are realized.

The present application relates to the technical field of catalyst preparation, and specifically discloses a preparation method of an ionic liquid / modified fly ash composite material and application thereof. The present application significantly improves the specific surface area of fly ash (FA) through alkaline hydrothermal modification of the fly ash, so that the fly ash becomes an ideal catalytic carrier material for synthesizing green porous catalysts. Further, ionic liquids (ILs) are obtained through quaternization reaction by using a silane coupling agent and an N-containing organic monomer as a monomer, and the ionic liquids are grafted on the modified fly ash carrier, so that the ionic liquid / modified fly ash (ILs@FA) composite material is successfully prepared. The prepared ILs@FA composite material is rich in Lewis acid and nucleophile bifunctional sites. The composite material as a catalyst shows excellent catalytic performance and cycle stability in the CO2 and epoxide cycloaddition reaction, and is expected to be used in actual industrial production.

The utility model discloses a device for preparing methanol by hydrogenating carbon dioxide, which comprises a hydrogen gas source, a carbon dioxide gas source, a fixed bed reactor and a condenser, the gas supply flow rate of the hydrogen gas source is not lower than 3 times of the gas supply flow rate of the carbon dioxide gas source; the fixed bed reactor comprises a reaction chamber formed in a main body, a plurality of pressure stabilizing devices and a heating device, a homogeneous porous catalyst layer is arranged in the reaction chamber, the raw material gas inlet is connected to the reaction chamber, and a heating part of the heating device is arranged in the reaction chamber and used for providing reaction temperature for the catalyst layer; the pressure stabilizing device is connected with the reaction chamber in the raw material gas flowing direction to provide reaction pressure for the catalyst layer; the condenser is connected to a product outlet of the fixed bed reactor and is used for separating the obtained methanol product. The methanol preparation device is simple in structure and effectively realizes rapid and efficient preparation of methanol.

The application relates to the field of catalysts, and particularly discloses an intelligent design and prediction method for a crystalline porous benzene selective hydrogenation basic zinc carbonate and zinc oxide co-modified nano catalyst, a preparation method of which adopts a mixed solution prepared by mixing and polyethylene glycol as a precipitant for rapid precipitation, and then high-pressure reduction, organic solvent washing, alkali washing and water washing steps are cooperated to prepare a porous catalyst with high specific surface area and uniform dispersion of active components. On this basis, an intelligent design and performance prediction system based on deep learning is further integrated, a convolutional neural network is used to analyze the microstructure of the catalyst, a multi-modal deep neural network is used to predict the performance of the catalyst, and an optimization algorithm is used to recommend optimal process parameters. The porous structure is constructed by co-modification of basic zinc carbonate and zinc oxide, and the intelligent system is combined to realize efficient research and development and accurate performance prediction of the catalyst.

A process for producing a three-dimensional porous Fe-doped beta zeolite catalyst monolith of stacked catalyst fibers, the process comprising the steps of: a) preparing a suspended paste in a liquid aqueous diluent of Fe-doped beta zeolite particles, and the suspension further comprises a binder material in a maximum amount of (50) wt%, based on the amount of the Fe-doped beta zeolite particles, and a plasticizer and a pore-forming material in a maximum amount of (10) wt%, each, based on the amount of the Fe-doped beta zeolite particles, and a peptizing agent in a maximum amount of 5 wt%, based on the amount of the Fe-doped beta zeolite particles, all the particles in the suspension have a number average particle size in the range of 0.05 to 700 m, b) extruding the paste of step a) through one or more nozzles to form fibers and depositing the extruded fibers to form a three-dimensional porous catalyst monolith precursor, c) drying the porous catalyst monolith precursor to remove the liquid diluent, d) temperature-treating the dried porous catalyst monolith precursor of step c) at a temperature in the range of 300 DEG C to 600 DEG C to form the Fe-doped beta zeolite catalyst monolith wherein the porous catalyst monolith precursor or porous catalyst monolith is not temperature-treated at a temperature above 600 DEG C, and wherein preferably in addition to copper, the porous catalyst monolith precursor or porous catalyst monolith is not temperature-treated at a temperature above 600 DEG C to form the Fe-doped beta zeolite catalyst monolith. No additional catalytically active metal, metal oxide or metal compound is applied to the surface of the Fe-doped beta zeolite particles, the catalyst monolith precursor or the Fe-doped beta zeolite catalyst monolith.

The invention discloses an efficient catalytic process of phenylimidazole derivatives, and belongs to the technical field of 2-phenylimidazole.The efficient catalytic process comprises the steps that a large-specific-surface-area layered structure provided by a zirconium-aluminum layered carrier serves as a carrier, titanium-based MOF is synthesized on the surface through hot water, a zirconium-titanium bimetal layered compound is obtained, the zirconium-titanium bimetal layered compound serves as a main carrier, and the high-efficiency catalytic process of the phenylimidazole derivatives is achieved. The surface of the porous catalyst is coated with resin with cation exchange capacity, the resin contains phosphonic acid groups and sulfonic acid groups, metal ions in copper nitrate and ferric sulfate can be fixed, agglomeration is avoided, the cation exchange resin becomes a porous carbon layer after calcination, and the specific surface area and porosity of the porous catalyst are further increased. And in the process, the coated zirconium-titanium bimetallic layered compound not only provides a large-surface-area carrier effect, but also plays a catalytic role to catalyze the generation of phosphonic acid and sulfonic acid groups.

The present invention relates to a novel catalyst for electrochemical chlorine generation in an extremely low salt condition and a catalyst electrode using same. In particular, the porous catalyst of the present invention has a structure in which a platinum-group metal catalyst is supported on a porous support containing a conductive metal oxide, and thus have excellent chlorine generation efficiency, specifically in an extremely low salt condition of less than 1 mM.