108 results about "Porous catalyst" patented technology

The preparation method comprises the following steps: mixing a catalyst, a pore forming agent, an ionomer and a solvent, carrying out ultrasonic treatment in an ice-water bath until the mixture is uniformly dispersed, then coating a polytetrafluoroethylene membrane with the mixture to obtain a catalytic layer, and then carrying out hot pressing and transferring the catalytic layer to two sides of a proton exchange membrane to obtain the membrane electrode. The catalyst layer of the prepared membrane electrode has a cross-linked porous network structure formed in situ when the pore forming agent is pyrolyzed and separated in the hot-pressing transfer printing process, so that the specific surface area of a three-phase interface and the utilization rate of a noble metal catalyst are increased, the gas and liquid mass transfer resistance of the membrane electrode is reduced, and the material transmission capability is improved; the performance of the membrane electrode is improved, and the membrane electrode has more excellent stability.

The invention discloses a porous catalyst for preparing green ammonia and a preparation method and application thereof, the porous catalyst for preparing green ammonia comprises the following raw material components: 50-70% of austenite iron powder, 15-20% of silica gel and the balance of an auxiliary agent, and the auxiliary agent is a mixture of kaolin, calcium carbonate powder and diatomite. According to the porous catalyst for preparing the green ammonia, the green ammonia synthesis temperature and pressure are reduced, and the ammonia synthesis rate is increased; the catalyst is high in structural strength, good in stability, slow in attenuation, long in service life and capable of being continuously and stably used for a long time, the replacement frequency of the catalyst is reduced, and the production cost is reduced; the method is suitable for industrialization.

The invention discloses a preparation method of a nano-porous CeO2 catalyst, and the preparation method of the nano-porous CeO2 catalyst comprises the following steps: S1, adding a cerium source into deionized water, and dissolving to obtain a cerium-containing aqueous solution; s2, adding a mixed solvent into the obtained cerium-containing aqueous solution, and uniformly stirring to obtain a mixed solution; s3, putting the obtained mixed solution into a reaction kettle for hydrothermal reaction, after the reaction is finished, centrifugally washing to obtain a solid substance, and then sequentially drying, conventionally grinding and calcining the obtained solid substance at high temperature to obtain the nano-porous CeO2 catalyst. The invention also provides a nano-porous CeO2 catalyst, and an application of the nano-porous CeO2 catalyst. Compared with the prior art, the preparation method of the nano-porous CeO2 catalyst has the advantages that the operation is simple, and the prepared nano-porous CeO2 catalyst has a good catalytic conversion effect on VOCs (Volatile Organic Compounds) and the like.

The present invention relates to a method for preparing, activating and regenerating a metal supported catalyst, comprising: treating a Ma-Mb-Mc metal supported catalyst at 10-700° C. by using an ammonia or nitrogen-containing organic matter, wherein the Ma metal is an active metal selected from one or more of a noble metal atom or a transition metal, the support is a common industrial porous catalyst, and the Ma metal is dispersed on the support in a state of single atomic site. According to the Ma-Mb-Mc metal supported noble metal / zinc catalyst treated by the method of the present invention, the direct dehydrogenation conversion rate and selectivity of catalyzing light alkanes are remarkably improved; the method for preparing the catalyst is simple in process, the catalytic activity after regeneration is still kept, and the catalyst can be industrially produced on a large scale.

There is provided a process for converting a CO2 and / or H2O-containing gas mixture, such as flue gas, into a low-carbon fuel. The process comprises contacting the gas mixture with a catalyst comprising: a catalyst body having metallic iron exposed superficially and pores. There is also provided processes for manufacturing an iron-based porous catalyst as porous monoliths having exposed catalytically active surfaces. There is also provided an iron-based catalyst, including iron oxides, to at least partially remove SOx from a gas mixture and a process for at least partially removing SOx from a gas mixture using the iron-based catalyst.

The invention provides a method for producing hydrogen through ammonolysis, which comprises the following steps: in a reaction device, acting current on a conductive catalyst, and introducing ammonia gas for reaction to obtain hydrogen. The invention provides a current-assisted low-temperature ammonia decomposition hydrogen production strategy based on an electrochemical Joule thermocatalytic reactor, and also provides a corresponding supported integrated porous catalyst. According to the method for producing hydrogen through low-temperature ammonia decomposition, when current directly passes through the catalyst, the catalyst can be excited to induce ammonia dissociation and dehydrogenation, so that ammonia conversion is greatly promoted. Meanwhile, due to the intrinsic characteristic of high resistance of the catalyst, electric energy is partially converted into heat energy, so that the surface temperature of the catalyst is increased (higher than the external environment temperature), the catalytic reaction is further promoted, and the high-efficiency ammonia decomposition process at the low reaction furnace environment temperature is realized. The invention provides an alternative solution for the problem of low activity of the existing low-temperature catalytic system.

The invention discloses a heat pump temperature control type plasma synergistic Fenton oxidation grading organic wastewater treatment system and method. The system comprises a first water pump, a plasma bubbling water treatment reactor, a Fenton-like oxidation reactor, an air pump, a high-voltage power supply, an evaporator, a first condenser, a compressor and a second condenser, by coupling Fenton reaction and realizing temperature control, low-temperature plasma heat energy and low-potential active oxide H2O2 are efficiently utilized to perform oxidative degradation on organic matters in a water body after plasma advanced oxidation reaction, and accurate temperature control in each stage of wastewater oxidation is realized so as to be beneficial to reaching the optimal temperature; due to the addition of a Fenton-like oxidation filler on the porous catalyst supporter plate, ferrous iron Fe < 2 + > in particles and H2O2 are subjected to a Fenton oxidation reaction to generate ferric iron Fe < 3 + > and. OH with strong oxidizing property to participate in organic matter degradation, and meanwhile, sensible heat in wastewater, electric heat provided by plasmas and chemical reaction heat in the plasma oxidation process are utilized through temperature control; the efficient degradation of industrial organic wastewater is favorably realized.

The present invention concerns a gas diffusion electrode for the electrochemical reduction of carbon dioxide comprising an electrically conductive porous gas diffusion layer; at least one porous catalyst layer arranged adjacent to said gas diffusion layer, said at least one porous catalyst layer comprising a first porous catalyst layer comprising a copper-based first catalyst material, wherein said first porous catalyst layer comprises a mixture of said copper-based first catalyst material and a hydrophobic material, said porous catalyst layer being obtained from a precursor material which does not contain any ionomer; and an ionomer layer arranged adjacent to said at least one porous catalyst layer, said ionomer layer being obtained from a precursor material which does not contain any catalyst. The invention also concerns an electrochemical cell comprising such a gas diffusion electrode and a method for manufacturing such a gas diffusion electrode.

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 relates to a preparation method of an oxygen vacancy regulated CuO / CeO2 porous catalyst, the CuO / CeO2 porous catalyst is composed of a carrier and an active component, the carrier is carbon and silicon-containing CeO2 with an inverse opal-like structure, the active component is oxygen vacancy-containing CuO or metal-doped CuO, and the content of the active component is 1-30 wt.%. Through regulation and control of the remaining amount of the carbon and silicon components, the pore structure and strength of the carrier, the interaction of the active components and the carrier, and the active oxygen vacancy of the catalyst, the activity and stability of the catalyst are effectively enhanced. The invention provides a novel catalyst for regulating and constructing a porous structure and oxygen vacancies and a method. The structure and composition modulation range of the catalyst is wide; the catalyst can be used for catalyzing CO preferential oxidation reaction under a hydrogen-rich condition, and has an application prospect in other reaction systems catalyzed by a copper oxide base.

The invention discloses a method for rapidly realizing efficient production of sesamol in situ based on a sesame oil system, which specifically comprises the following steps: preparing an acid-rich site porous catalyst, preparing a 0.5 mol / L oxalic acid solution, mixing according to a ratio of Al-MCM-41 mesoporous molecular sieve to oxalic acid of 1 g: 20 mL, stirring and reacting at 50 DEG C for 6 hours, centrifugally separating the modified mesoporous molecular sieve at a speed of 4500 r / min, and drying to obtain the sesamol. Washing with deionized water to be neutral, and drying overnight at 110 DEG C; roasting the dried molecular sieve in a muffle furnace at 300 DEG C for 4 hours; the catalyst is prepared; 3% (w / w) of a catalyst is introduced into a cold-pressed sesame oil system, stirring reaction is performed for 5-30 min at the temperature of 80 DEG C, and after the solid catalyst is removed, finished sesame oil rich in high-activity sesame lignan is obtained. The rapid directional conversion from sesamolin to sesamol can be efficiently realized, so that the oxidation stability and the anti-inflammatory activity of the sesame oil are remarkably improved.

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.

The invention discloses an oxygen evolution electrode with a self-supporting structure as well as a preparation method and application of the oxygen evolution electrode. Belongs to the technical field of electrocatalysis. Comprising a substrate and a porous catalyst layer loaded on the surface of the substrate, the method does not need to use an organic precipitator, so that the pollution to the environment is avoided; a strong alkaline precipitant is not adopted, and metal salt is quickly attached to the surface of a metal framework by utilizing a transient high-temperature process, so that the uniform distribution of the obtained metal active component is ensured; high-temperature and high-pressure equipment is not needed, the process is safe, and the cost is low. The prepared catalyst is loaded on the foam metal in situ, the binding force is strong, the catalyst is not easy to fall off, and the contact resistance is small. The oxygen evolution electrode prepared by the method has the advantages of low overpotential, long service life, high catalyst stability, low cost and the like, and has a good industrial application prospect.

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.

The invention discloses a method for growing a porous catalyst on a gas diffusion layer, which comprises the following steps: S1, pretreatment of a metal gas diffusion layer: cleaning the surface of the metal gas diffusion layer in an acid solution to remove impurities and an oxide layer on the surface; s2, preparing an electroplating solution, namely preparing the electroplating solution containing catalyst ions and a pore-forming agent; s3, electroplating process: carrying out electroplating reaction on the metal gas diffusion layer treated in the step S1 by utilizing the electroplating solution prepared in the step S2 to form a uniformly distributed porous catalyst layer; and S4, post-treatment: carrying out cleaning and heat treatment on the electroplated porous catalyst layer. The problem that the thickness is not uniform possibly in the spraying process can be avoided, the catalyst layer and the gas diffusion layer substrate are firmly combined and are not prone to falling off, the long-time stability of the catalyst is ensured, a uniform porous structure can be formed in the electroplating process, and the catalytic efficiency of electrolyzed water can be improved.

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.

The present invention discloses a 3D dendritic porous Ni3P / SiO2 catalyst and its preparation method and application. The catalyst comprises an active component of nickel phosphide alloy and a support of dendritic porous SiO2, wherein the content of metallic Ni is 22% - 32% of the total mass of the catalyst, the content of phosphorus element is 3.8% - 5.6% of the total mass of the catalyst, and the content of SiO2 is 74.2% - 62.4% of the total mass of the catalyst. This catalyst uses 3D-dendritic SiO2 as the support, and its three-dimensional open framework structure has a high pore permeability. The metal is loaded on the surface of the support by the impregnation method and enters its petal-shaped pores at the same time, which is beneficial to improving the dispersion degree of Ni3P nanoparticles. Compared with Cu-based and Ag-based catalysts, it shows remarkable stability at high temperatures, maintains a high selectivity for MG within a large stable range, and can realize the conversion of dual products MG and MA by regulating the reaction temperature respectively.

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 belongs to the field of catalysts, and relates to a porous catalyst and a preparation method and application thereof.Zirconium chloride, PET and heteropoly acid are dispersed in a solvent according to the mass ratio of (1-20): (1-20): 1 for solvothermal reaction, the solvothermal reaction temperature is 100-200 DEG C, the reaction time is 8-24 h, and after cooled solids are washed and dried, the porous catalyst is obtained. And roasting at 80-450 DEG C for 1-6 hours to obtain the porous catalyst. According to the catalyst, 1-phenethyl alcohol can be efficiently converted into styrene through a liquid phase dehydration reaction, the conversion rate of raw materials is remarkably increased, the catalyst is easy to recycle, the environment friendliness of the catalyst is greatly reflected, and a green and sustainable process route is provided for styrene synthesis.

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.