403results about "Catalyst protection" patented technology

The invention discloses a method for synthesizing electronic-grade ethyl acetate through catalytic esterification of acidic ion exchange resin, and belongs to the technical field of ethyl acetate preparation. The method comprises the following steps: mixing crosslinked polystyrene white balls and a swelling agent, and dropwise adding concentrated sulfuric acid for reaction to obtain S-PS resin; mixing an EDTA disodium salt saturated solution and a polyacrylic acid solution, adding a cross-linking agent and an emulsifier, and carrying out a cross-linking curing reaction to obtain EDTA microcapsules; the preparation method comprises the following steps: dispersing S-PS resin in a solvent, adding EDTA microcapsules, a dehydration condensation agent and a catalyst, reacting under the protection of inert gas, and filtering and recovering after the reaction is finished to obtain S-PS-EDTA resin; mixing glacial acetic acid, absolute ethyl alcohol and S-PS (at) EDTA resin for reaction, and filtering and collecting liquid after the reaction is finished; and rectifying the collected liquid to obtain the product. According to the method provided by the invention, metal impurities can be chelated in the synthesis process, and the electronic-grade ethyl acetate with high purity and low impurity content is produced.

The invention discloses a method for preparing dimethyl carbonate through reaction of CO and methyl nitrite, belongs to the technical field of preparation of dimethyl carbonate, and aims to solve the problem that in the prior art, in the process of preparing dimethyl carbonate through catalysis of reaction of CO and methyl nitrite, the reaction time is short. The preparation method specifically comprises the following steps: in an inert gas atmosphere, mixing and stirring isocyanatopropyltriethoxysilane and N, N-dimethylformamide, raising the temperature of a reaction system to 50-60 DEG C, carrying out a reaction for 1-2 hours, and carrying out a reaction for 1-2 hours, so as to obtain a reaction solution; and 3-aminopropionic acid is added into the reaction system. According to the method, silicon-aluminum coating, potassium modification and 18-crown-6-ether modification are sequentially performed after a halogen-free palladium-copper catalytic system is prepared, so that the conversion rate of impurities and the chromatic value of a product are reduced, the conversion rate of methyl nitrite is effectively increased, and the service life of the catalyst is effectively prolonged.

The invention provides an efficient environment-friendly petroleum passivator as well as a preparation method and application thereof, and belongs to the technical field of passivators. The preparation method comprises the following steps: reacting bismuth nitrate with tetra (4-carboxyl phenyl) porphyrin and benzoic acid to prepare a carboxyl phenyl porphyrin bismuth-MOF material, reacting antimony nitrate with tetra (4-pyridyl) porphyrin and benzoic acid to prepare a pyridyl porphyrin antimony-MOF material, and performing sol-gel reaction on lanthanum isopropoxide and cerium isopropoxide to prepare lanthanum-cerium sol; the preparation method comprises the following steps: mixing calcium nitrate, magnesium chloride, organic acid, organic amine and hydrogen peroxide for reaction to prepare a calcium / magnesium organic matter, mixing the calcium / magnesium organic matter with other substances, adding the mixture into an acetonitrile / ethanol mixed solvent, and uniformly stirring and mixing to prepare the efficient environment-friendly petroleum passivator. The high-efficiency environment-friendly petroleum passivator prepared by the invention is green, safe, non-toxic and efficient, has better capturing and passivating effects on metal ions such as nickel and vanadium in the catalytic cracking reaction process of heavy oil, improves the activity of a catalyst, prolongs the service life of the catalyst, and thus, has a wide application prospect.

The invention belongs to the technical field of preparation and application of materials, and particularly discloses a method for coating the surface of polyoxometallate with titanium dioxide and application, and the method comprises the following steps: providing polyoxometallate; according to the method, titanium source injection, inert gas purging, reaction gas injection and inert gas re-purging are used as an ALD cycle, multiple cycles are carried out under the same condition, and the titanium dioxide coating layer is deposited on the surface of polyoxometallate. The obtained titanium dioxide coating layer is compact and uniform, the polyoxometallate and the titanium dioxide coating layer cooperate with each other when the titanium dioxide coating layer is applied to the photocatalytic carbon dioxide reduction reaction, the catalytic activity is remarkably improved, and the defects that existing polyoxometallate is poor in stability, prone to agglomeration and the like are overcome in a targeted mode.

The invention belongs to the technical field of flue gas denitration, and particularly relates to a denitration catalyst, a preparation method thereof and application of the denitration catalyst in flue gas denitration of a cement kiln. The denitration catalyst provided by the invention is prepared from the following raw materials: 5 to 10 parts of montmorillonite powder, 60 to 85 parts of titanium dioxide, 1 to 2 parts of stearic acid, 4 to 6 parts of metavanadate, 2 to 4 parts of glass fiber, 3 to 5 parts of niobium phosphate, 1 to 3 parts of carboxymethylcellulose and 1 to 3 parts of polyoxyethylene. When the denitration catalyst provided by the invention is applied to cement kiln flue gas denitration, the main active component vanadium poisoning of the catalyst can be effectively avoided, and the denitration activity of the catalyst is further improved.

The invention discloses an anti-alkali metal poisoning SCR (Selective Catalytic Reduction) catalyst and a preparation method and application thereof, and belongs to the field of catalysts for atmospheric governance, the SCR catalyst comprises the following components in percentage by mass: 80%-90% of TiO2, 0.5%-1.5% of V2O5, 3%-5% of WO3 and 3%-10% of a cocatalyst; the cocatalyst comprises one or two of zirconium phosphate and titanium phosphate. The SCR catalyst provided by the invention is high in targeting property and remarkable in alkali metal poisoning resisting effect. TiO2 is used as a main carrier, V2O5 provides a main catalyst active component, WO3 can improve the thermal stability and acidity of the catalyst, a cocatalyst loses activity after capturing alkali metal, and an effective chemical barrier is constructed by sacrificing the cocatalyst; the path that alkali metal ions continue to diffuse into the coating and react with key V-OH acidic sites is blocked, and the alkali poisoning resistance is qualitatively improved, so that the denitration activity of the catalyst is preserved.

The invention discloses a sulfur-resistant non-noble metal catalyst for removing carbon monoxide and a preparation method thereof. The preparation method comprises the following steps: step 1, dissolving aluminum oxide, cerium-containing metal salt and a precipitator in a solvent, fully mixing, and dispersing to obtain a colloidal dispersion system; a hydrothermal product is obtained after the hydrothermal reaction, and solid powder A is obtained after the hydrothermal product is roasted; step 2, dropwise adding a copper-containing metal salt solution into the solid powder A under a ball-milling condition to obtain a turbid liquid; carrying out heat preservation roasting to obtain solid powder B; 3, roasting the molybdenum-containing metal salt, and performing thermal decomposition to obtain solid powder C; and 4, adding the solid powder C obtained in the step 3 into the turbid liquid of the solid powder B, dispersing, and roasting to obtain the required catalyst. The obtained catalyst is stable in overall structure and can still keep good catalytic performance in a sulfur-containing environment.

The invention relates to the technical field of phase-change materials, and discloses a light-operated composite phase-change material catalyst and a preparation method and application thereof, and a light-operated phase-change composite material is a paraffin-encapsulated metal M / halloysite / sodium alginate composite phase-change material; according to the metal M / halloysite / sodium alginate composite phase change material for packaging the paraffin, halloysite / sodium alginate aerogel loaded by metal M nanoparticles is used as a supporting material, and the paraffin is packaged in the metal M / halloysite / sodium alginate composite phase change material. According to the invention, the metal M / halloysite / sodium alginate composite phase change material for packaging paraffin is prepared by using the halloysite nanotube, the aerogel in the invention has a relatively large paraffin encapsulation amount, the encapsulation efficiency can reach up to 86%, and the phase change material can still maintain good mechanical and chemical stability after multiple heat absorption and release cycles. The melting and solidification of paraffin in the composite phase change material are controlled by turning on and turning off the light source, and the exposure and shielding of active sites are realized, so that the catalytic reaction is accurately started and stopped, and the complete starting and pausing of the reaction are realized.

The invention belongs to the technical field of catalysts, and particularly relates to a formaldehyde removal catalyst and a preparation method and application thereof. The formaldehyde removal catalyst is prepared by carrying out hydrothermal reaction and roasting treatment on a mixture of the following raw materials: metal salts including Mn salt, Co salt and Fe salt; an organic precursor, wherein the organic precursor comprises 2-nitroaniline and carboxymethyl cellulose; wherein the molar ratio of the Mn element to the Co element to the Fe element in the metal salt is (4.5 to 5.0): (2.0 to 2.5): (1.5 to 1.8); the ratio of the total mass of the Mn element, the Co element and the Fe element in the metal salt to the mass of the organic precursor is (80-85): (15-20). According to the formaldehyde removal catalyst, the metal elements are loaded on the hydrophobic carbon layer of the nitrogen-containing structure, so that the problem that the toluene adsorption capacity is weak due to the fact that a traditional catalyst does not have specific sites is solved, and the problem that the catalyst is inactivated due to the fact that multiple pollutants compete for active sites and a product overflows slowly can also be solved.

The invention belongs to the technical field of antibiotic pollutant degradation, and discloses a method for degrading antibiotic pollutants by using boron-carbon co-regulated nanoscale zero-valent iron as an activating agent, which comprises the following steps: step 1, synthesizing carbon-coated nanoscale zero-valent iron, marked as Fe0-C, through a hydrothermal method and a carbothermic method; and step 2, mixing the Fe < 0 >-C obtained in the step 1 with crystal boron, adding the mixture into sewage containing antibiotic pollutants, and then adding persulfate as an oxidizing agent to degrade the antibiotic pollutants. A boron-carbon co-regulation method is adopted to realize the passivation resistance of the nano zero-valent iron in the whole process from preparation, storage to application, and the nano zero-valent iron is applied to the process of activating persulfate to degrade tetracycline.

According to the aluminum oxide catalyst carrier and the preparation method thereof, ethyl orthosilicate and cerium oxide are combined with aluminum oxide, a stable Si-O-Al covalent bond is formed on the surface of aluminum oxide, a compact SiO2 protective layer is constructed, direct contact between water vapor and hydroxyl is effectively isolated, and therefore the hydrothermal stability of the carrier is remarkably improved; according to the present invention, with the SiO2 network structure, the SiO2 network structure can effectively fix and disperse the CeO2 nanoparticles and prevent the CeO2 nanoparticles from agglomeration and inactivation, and the Al2O3 can promote the migration of the electrons and the oxygen species at the SiO2-Al2O3 interface so as to provide the second corrosion resistance barrier on the protection layer through the cooperation of the oxygen vacancy introduced by the CeO2 and the excellent Cl ion capture ability, such that the corrosion resistance of the aluminum oxide matrix can be further inhibited; the interface bonding strength is enhanced, so that the water poisoning resistance and chlorine corrosion resistance of the aluminum oxide catalyst in a high-humidity and high-chlorine environment are improved through the dual cooperation of tetraethoxysilane and cerium oxide.

The present disclosure provides an exhaust gas purification device capable of efficiently reducing NOx even after high-temperature exhaust gas flows in, and a method for manufacturing the same. This exhaust gas purification device is provided with: a substrate having an upstream end and a downstream end; a first catalyst layer formed across a first region between the upstream end and a first position; and a second catalyst layer including second rhodium particles formed across a second region between the downstream end and a second position. The first catalyst layer includes a first rhodium-containing catalyst and a first cerium-containing oxide. The average value of the particle size distribution of first rhodium particles contained in the first rhodium-containing catalyst is 2-10 nm. On the basis of the total weight of rhodium contained in the first rhodium-containing catalyst, the amount of solid-solution rhodium in the first metal oxide carrier is less than 17 wt%.

One aspect of the present invention relates to an MFI-type zeolite catalyst containing chromium that contains hexavalent chromium.

An electric field catalyst that includes: a porous honeycomb substrate; a catalyst layer covering a surface of the porous honeycomb substrate; and a high-resistance layer that is higher in electrical resistivity than the catalyst layer between the honeycomb substrate and the catalyst layer.

The invention discloses a hydrogenation catalyst as well as a preparation method and application thereof. The hydrogenation catalyst comprises a carrier and active metal, the carrier is an aluminum oxide core wrapped by a carbon shell, the active metal is Mo and Ni, and on the basis of the weight of the catalyst, the content of MoO3 is 7.5 wt%-15.5 wt%, the content of NiO is 1.5 wt%-4.5 wt%, the content of carbon is 20 wt%-45 wt%, and the content of aluminum oxide is 35 wt%-70 wt%; and the ratio delta 1 of the content of the active metal in the shell layer to the content of the active metal in the core layer is 0.25: 1-0.75: 1. The preparation method comprises the following steps: (1) preparing active metal modified flour; (2) preparing active metal modified pseudo-boehmite microspheres; and (3) rolling the active metal modified flour and the active metal modified pseudo-boehmite microspheres for molding, then carrying out heat treatment, drying and roasting to obtain the hydrogenation catalyst. The catalyst disclosed by the invention has relatively high metal impurity capacity and relatively high Ca, Fe, Ni and V removal capacity, and is suitable for being used as a hydrogenation protection catalyst and a hydrodemetallization catalyst in a residual oil hydrogenation process.

A catalyst device for a lead acid battery, and a lead acid battery comprising the catalyst device are disclosed. A catalyst layer (120) is mounted in a cavity (112) of the device, and a porous layer (140) comprising a thermoplastic material is mounted in the cavity so as to cover a face of the catalyst layer and is configured to prevent thermal runaway of the catalyst device. And the plane size of the porous layer is larger than that of the catalyst layer. The catalyst layer is mounted in a cavity within a maintenance means (130) configured to maintain the position of the catalyst layer within the cavity, and wherein at least one face is covered by the porous layer, thereby ensuring alignment of the catalyst layer and the porous layer in use.

The present invention discloses a heavy oil and residual oil hydrodemetallization catalyst and a preparation method thereof. The catalyst comprises an inner catalyst layer and an outer carbon membrane layer coated on the surface of the inner catalyst layer. The inner catalyst layer comprises a first alumina layer loaded with a first active component and a second alumina layer loaded with a second active component. The outer carbon membrane layer has a thickness of 40 to 120 μm, and the ratio of tetrahedral molybdenum to octahedral molybdenum in the catalyst, calculated as Mo atoms, is 0.18 to 0.58. The catalyst provided by the present invention has a high utilization rate of active metals in the inner layer and excellent resistance to carbon deposition. When used in heavy oil and residual oil hydrodemetallization reactions, it exhibits high demetallization activity and metal-tolerant capacity, ensuring stable catalyst activity during long-term operation.

The invention discloses a Ni-Sn@C-SDB catalyst and its application and a method for catalyzing the aqueous catalytic synthesis of higher alcohols from ethanol. The catalyst is prepared by ball milling a Ni-Sn bimetallic catalyst and a hydrophobic polymer SDB to obtain NiSn@C-SDB. The hydrophobic polymer is ball milled to greatly increase the hydrophobicity of the catalyst, thereby reducing the phenomenon of deactivation caused by the dehydration of the aldol condensation reaction and the water molecules in the reaction raw materials, resulting in the blockage of the catalyst internal pores, the formation of "water poisoning", and the formation of a phenomenon of deactivation. The catalyst is applied in the reaction of catalyzing the one-step synthesis of higher alcohols from aqueous ethanol, showing excellent catalytic efficiency, high reaction activity, high ethanol conversion rate, and increased selectivity for C6+ higher alcohols. The catalyst is simple to prepare, low in cost, and the reaction performance of the catalyst is improved by simple ball milling, which is more conducive to its production application. The invention belongs to the field of catalyst technology.

The application relates to the field of photocatalytic materials, in particular to a SiO2 / Au nanostar / TiO2 composite catalyst, a preparation method and application in ammonia synthesis. The preparation method comprises the following steps: preparing monodisperse SiO2 microspheres; preparing functionalized modified SiO2 microspheres; preparing Au nanostar loaded SiO2 microspheres; and preparing the SiO2 / Au nanostar / TiO2 composite catalyst. The catalyst has a unique core-shell structure, the core diameter of the Au nanostar is 30-40 nm, the length of the sharp spike is 6-10 nm, and the tip part penetrates into the TiO2 shell layer. In the deionized water system, the catalyst can efficiently and stably catalyze nitrogen reduction to synthesize ammonia under visible light irradiation without adding any sacrificial agent or electrolyte, solves the problems that the existing photocatalytic ammonia synthesis technology depends on an organic sacrificial agent, is easy to corrode equipment, and the catalyst stability is poor, and provides a green, efficient and stable new scheme for synthesizing ammonia.

This invention discloses a method for hydrotreating catalytic cracking slurry. A fixed-bed hydrotreating process is employed, comprising: in the presence of hydrogen, the catalytic cracking slurry sequentially contacts a hydrotreating protectant, a hydrotreating transition catalyst, and a hydrodesulfurization catalyst to undergo a hydrotreating reaction, yielding hydrotreated oil. The hydrotreating protectant comprises an alumina support with a most probable pore size of 40–100 nm, molybdenum oxide, and cobalt oxide. The hydrotreating transition catalyst comprises an alumina support containing additives and MoO3 and CoO. The support has a bimodal pore size distribution, with smaller pores concentrated in the 10–40 nm range and larger pores concentrated in the 150–400 nm range. This method eliminates the diffusion resistance during the adsorption and reaction of large molecules on the catalyst surface during the hydrotreating of catalytic cracking slurry, increases the capacity for more deposits such as coke, extends the operating cycle of the unit, and facilitates hydrodesulfurization and other reactions. It also increases the content of tricyclic and tetracyclic aromatics in the hydrotreated oil, making it a high-quality feedstock for needle coke production.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of a novel NaY molecular sieve supported palladium and metal additive catalyst for co-production of dimethyl carbonate, the catalyst mainly comprises 0.1-3.0% by mass of Pd active component, 0.1-10.0% by mass of metal additive and 0.1-10.0% by mass of NaY molecular sieve carrier. The metal auxiliary agent not only effectively eliminates acid in the catalyst, but also promotes the generation of high-valence Pd active species, and the Pd active species are stabilized by utilizing the electron withdrawing effect of the auxiliary agent on the Pd active species. The catalyst is applied to a reaction for synthesizing dimethyl carbonate by carbonylation of methyl nitrite in a process of co-producing ethylene glycol from coal and co-producing dimethyl carbonate, shows excellent catalytic performance, and has certain industrial application prospects.

The present invention relates to a method for preparing a Fischer-Tropsch synthesis catalyst in which 15 to 40 mole percent of the cobalt is in the form of cobalt oxide. The present invention also relates to a start-up process for a reduced and passivated cobalt-containing Fischer-Tropsch catalyst, wherein 15 to 40 mole percent of the cobalt is in the form of cobalt oxide, and the reduced and passivated catalyst is activated by contacting the catalyst with a synthesis gas stream.

This invention proposes a highly efficient and environmentally friendly petroleum passivating agent, its preparation method, and its application, belonging to the field of passivating agent technology. Bismuth nitrate is reacted with tetrakis(4-carboxyphenyl)porphyrin and benzoic acid to prepare carboxyphenylporphyrin bismuth-MOF material; antimony nitrate is reacted with tetrakis(4-pyridyl)porphyrin and benzoic acid to prepare pyridylporphyrin antimony-MOF material; lanthanum isopropoxide and cerium isopropoxide sol-gel are reacted to prepare lanthanum-cerium sol; calcium nitrate and magnesium chloride are mixed with organic acids, organic amines, and hydrogen peroxide to prepare calcium / magnesium organic compounds, which are then added to an acetonitrile / ethanol mixed solvent and stirred until homogeneous to obtain the highly efficient and environmentally friendly petroleum passivating agent. The highly efficient and environmentally friendly petroleum passivating agent prepared by this invention is green, safe, non-toxic, and highly efficient. It has a good capture and passivation effect on metal ions such as nickel and vanadium in the heavy oil catalytic cracking process, improving the activity of the catalyst and extending its service life, thus having broad application prospects.

The present application relates to the technical field of molecular sieve preparation, and provides a preparation method of a photocatalytic degradation acid red B catalyst.The preparation method comprises the following steps: mixing SBA molecular sieve raw powder, a metal source, a first silicon source and an alkali solution to obtain a mixture, and then performing molding and drying on the mixture to obtain molecular sieve A; wherein the metal source comprises at least one of a vanadium source and a titanium source; mixing an organic template agent R, water, a second silicon source and an acid to obtain a solution B; adding the solution B into the molecular sieve A, and then performing hydrothermal crystallization, filtration, washing, drying and calcination to obtain the photocatalytic degradation acid red B catalyst.The preparation method is simple, and the catalyst prepared by the method is covered with a silicon dioxide film outside the molecular sieve, so that the metal active sites are not easy to flow away in the reaction process.The present application further provides a photocatalytic degradation acid red B catalyst and a method for photocatalytic degradation of acid red B.

The invention belongs to the field of catalysts, and particularly relates to a sulfur-tolerant monolithic catalyst for catalytic combustion of VOCs as well as a preparation method and application of the sulfur-tolerant monolithic catalyst. The catalyst comprises a substrate and a functional layer coated on the surface of the substrate, the functional layer sequentially comprises a carrier coating, an active coating and a protective coating from the position close to the base body to the position away from the base body. According to the invention, the protective coating is adopted, and transition metal oxide is added in the coating as a protective agent. On one hand, the transition metal oxide is low in price, so that the production cost of the catalyst is reduced; on the other hand, the protective coating protects active sites from being contacted with SO2, so that the sulfur resistance of the catalyst is enhanced, and the catalytic stability of the catalyst in sulfur-containing gas can be remarkably enhanced.

The application discloses a high-stability modified manganese dioxide catalyst anode and a preparation method thereof. The anode comprises, from bottom to top, a conductive base, a corrosion-resistant conductive layer, a modified manganese dioxide catalyst layer and a silica gel coating layer; the modified manganese dioxide catalyst layer comprises fluorine and metal co-doped nanometer manganese dioxide and carbon materials, the metal is at least one of niobium, bismuth, tin, cerium, lanthanum, cobalt, silver, nickel, platinum, tantalum, ruthenium, iridium and antimony, and the carbon materials comprise graphene and / or carbon nanotubes; the anode has the characteristics of good stability, high current efficiency and long service life, and the preparation method is simple in operation, mild in reaction condition and low in cost, and is favorable for large-scale production.

The invention provides a precious metal platinum-doped nano zinc oxide photocatalyst, a preparation method and application, and relates to the technical field of catalyst synthesis. The method specifically comprises the following steps: pretreating a natural biological material with a hierarchical porous structure as a soft template, and freeze-drying to obtain a Zn < 2 + > supported biological template; placing the template in a mixed solvent, performing microwave hydrothermal synthesis to obtain a ZnO (at) biological template, and performing centrifugal washing; preparing a doping solution containing noble metal ions, dissolving the ZnO (at) biological template in the doping solution containing noble metal ions, and irradiating under ultraviolet light; calcining in an air atmosphere, and then immersing a product into a citric acid solution to obtain the catalyst. By combining a natural biological template with microwave-assisted hydrothermal and in-situ photochemical reduction technologies, uniform doping of ultralow noble metals (Pt, Pd, Au and the like) in a ZnO hierarchical porous structure is realized, and material morphology regulation and control and active site construction are synchronously completed.

To provide a compression ignition internal combustion engine for a heavy-duty diesel vehicle provided with a composite oxidation catalyst capable of reducing or preventing catalyst contamination due to phosphorus and / or zinc and substantially maintaining durability for a longer period of time.SOLUTION: A composite oxidation catalyst included upstream of the soot filter substrate has a substrate 5 with length L and a first catalytic washcoat zone 1 with length LI<L where one end is defined by the inlet end I and the second end is defined by the first end 15 of the second catalytic washcoat zone 2 with length L2<L. The second end is defined by the outlet end O and extends in an axial direction from the inlet end I and comprises a washcoat coating layer G comprising particulate metallic oxides having a loading of greater than 48.8 g / l, wherein a total platinum group metal loading in the first catalyst washcoat zone is greater than a total platinum group metal loading in the second catalyst washcoat zone 2 and wherein the first catalyst washcoat zone comprises one or more alkaline earth metal components supported on the first refractory metal oxide support material.SELECTED DRAWING: Figure 1

The present invention relates to processes for preparing propylene oxide, comprising reaction of propene with ethylbenzene hydroperoxide in the presence of a catalyst, as well as to catalysts employed in such processes and to methods for their manufacture. The catalysts of the invention are prepared in a process comprising sol-gel-synthesis of catalyst hydrogel-precursor, drying of catalyst hydrogel precursor, calcining of dried catalyst hydrogel-precursor, and optionally hydrophobizing the calcined catalyst hydrogel-precursor. The catalysts of the invention comprise amorphous titanium doped silica comprising pentahedrally coordinated titanium species.