520results 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 a sulfur-tolerant shift pre-transformation protective agent as well as a preparation method and application thereof, and relates to the technical field of sulfur-tolerant shift. The magnesium aluminate spinel, the nickel aluminate spinel and the activated carbon are used as composite carriers, the cobalt is used as a main conversion active component, the detoxification carriers have good adsorption and removal effects on arsenic compounds and small-particle impurities, the arsenic capacity is large and is not influenced by the content of hydrogen sulfide, the conversion activity of the protective agent is moderate, the temperature rise of a bed layer is controllable, and the conditions of large temperature rise and overtemperature are avoided; the influence of a water-carrying working condition on the catalyst is greatly avoided, and the catalyst is suitable for a pre-shift furnace and a detoxification tank in a sulfur-tolerant shift process.

The invention discloses a preparation method of a combustion type warm cloud catalyst, the combustion type warm cloud catalyst comprises a first slurry and a second slurry, the first slurry and the second slurry are prepared by layered inclined pouring and curing, the first slurry comprises 35%-70% of an oxidizing agent, 3%-8% of a combustion agent, 10%-16% of a moisture absorbent and 13%-21% of an adhesive, the second slurry comprises 60%-70% of an oxidizing agent, 15%-17% of a combustion agent and 13%-25% of an adhesive. Through a method of layered pouring of two medicaments, hygroscopic salts are thoroughly isolated from external water vapor, the problem of moisture absorption failure caused by long-term storage is solved, the components and proportions of the oxidant and the incendiary agent are optimized, the combustion temperature is changed, the diameter of aerosol particles generated after combustion is controlled, and the problem of poor moisture absorption is solved.

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 discloses a preparation method of a molecular sieve coated noble metal-rare earth metal / TiO2 monolithic catalyst and application of the molecular sieve coated noble metal-rare earth metal / TiO2 monolithic catalyst in CO oxidation reaction, and relates to the technical field of industrial catalysis and waste gas treatment. The catalyst comprises a composite active component composed of noble metal and rare earth metal, a TiO2 carrier and a molecular sieve coating layer, wherein the composite active component composed of the noble metal and the rare earth metal is dispersed in the TiO2 carrier, and the TiO2 carrier is coated with the molecular sieve coating layer. The catalyst provided by the invention shows excellent catalytic performance and excellent sulfur poisoning resistance and heavy metal poisoning resistance in CO oxidation reaction, has good economical efficiency and long-acting stability, and provides an efficient and stable CO oxidation catalyst technical scheme for flue gas treatment in the iron and steel industry.

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 present invention provides a hydrogenation catalyst for petroleum resin, the hydrogenation catalyst comprises a catalyst, the catalyst contains an active component main body expressed as a general formula of M1-M2 / SiO2-Al2O3, M1 is an alloy of Ni and Co, and the atomic ratio of Ni to Co is 2: 1-4: 1; m2 is a composite oxide of Mo and W, and the molar ratio of Mo to W is 1: 1-3: 1; and SiO2-Al2O3 is used as an aluminum silicate precursor and is subjected to hydrolytic condensation to form a composite carrier with a three-dimensional silicon-aluminum bond network structure. The invention relates to the technical field of petroleum resin catalysts. The surface of the carrier is anchored with double active components, namely nickel-cobalt alloy capable of efficiently cracking hydrogen and generating active hydrogen atoms and molybdenum-tungsten composite oxide capable of selectively adsorbing aromatic rings and sulfide molecules; and cracked hydrogen atoms can be quickly migrated to adsorption sites through the surface of the carrier, and aromatic ring hydrogenation saturation and deep removal of sulfur impurities can be synchronously realized, so that the working efficiency of the hydrogenation catalyst is effectively improved.

The invention belongs to the technical field of biochar preparation, water treatment and new materials, and discloses a composite material for sulfonamide antibiotic treatment, a preparation method and application, and the preparation method comprises the following steps: preparing sludge biochar SBC; mnO2 coated OSBC is prepared; aminated PCA is prepared; pCA-MnO2 (at) OSBC is prepared; the preparation method comprises the following steps: cutting absorbent cotton, ultrasonically cleaning with deionized water, drying, dispersing PCA-MnO2 coated OSBC into a polyvinyl alcohol PVA solution, dipping the absorbent cotton, dropwise adding glutaraldehyde for crosslinking, curing, dipping into a PCA-MnO2 coated OSBC suspension, and carrying out freeze-drying heat treatment. The composite material disclosed by the invention has relatively stable physical properties and chemical properties, can be efficiently separated from an aqueous solution and recycled after being degraded, and can achieve a relatively good degradation effect in various typical real water bodies.

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 method for high-selectivity synthesis of ethylene sulfate from ethylene sulfite. An organosilane functional group is introduced to the surface of a TS-1 molecular sieve, the hydrophilic and hydrophobic degree of TS-1 is regulated and controlled, water is effectively prevented from being enriched around TS-1, and DTD hydrolysis side reaction is reduced, so that the stability and oxidation performance of the catalyst are improved, and the dispersity of TS-1 in a system is improved. The TS-1 treated by octadecyl trichlorosilane has moderate-strength hydrophobicity, so that the adsorption of substrates ES and H2O2 on the surface of the catalyst can be ensured, the aggregation of H2O molecules on the surface can be reduced, and the hydrolysis of DTD on the surface of the catalyst is inhibited. When the modified TS-1 molecular sieve catalyzes an ES oxidation reaction, DTD selectivity can reach 95% or above, and the modified TS-1 molecular sieve has good stability and reusability. The method is simple to operate, low in cost and suitable for large-scale industrial production.

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.

The invention belongs to the technical field of organic synthesis, and particularly relates to 1, 1, 1, 3-tetrachloropropane and a synthesis method thereof. The synthesis method comprises the following steps: adding a carbon-coated elemental iron catalyst, a cocatalyst and carbon tetrachloride into a reaction kettle, heating to a reaction temperature, introducing ethylene to a reaction pressure, carrying out a reaction while keeping the temperature and the pressure to obtain a crude tetrachloropropane product, and filtering and rectifying the crude tetrachloropropane product to obtain 1, 1, 1, 3-tetrachloropropane, the preparation method of the coated elemental iron catalyst comprises the following steps: dissolving ferric citrate in ethanol, uniformly stirring to obtain a precursor solution, drying in a vacuum drying oven at 50 DEG C to obtain precursor powder, and performing high-temperature pyrolysis on the precursor powder in an inert atmosphere to obtain the carbon coated elemental iron catalyst. The synthesis reaction of 1, 1, 1, 3-tetrachloropropane disclosed by the invention has the advantages of high carbon tetrachloride conversion rate, high tetrachloropropane selectivity, short reaction time and small by-product generation amount.

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 invention discloses a catalyst for preparing lactide through condensation of lactic acid and a preparation method and application thereof, the preparation method comprises the following steps: S1, adding an activator N-isopropyl-N-methylpropan-2-amine into a proline solution, then adding a zinc salt, reacting to obtain proline zinc, adding a catalyst, and reacting to obtain proline zinc; wherein the mass ratio of the N-isopropyl-N-methylpropane-2-amine to the proline is (4 to 6): 100, and the mass ratio of the N-isopropyl-N-methylpropane-2-amine to the proline is ( And S2, mixing and reacting zinc proline and the SAPO-11 molecular sieve in a solvent according to a mass ratio of 1: (0.8-1.2) to obtain the zinc proline / SAPO-11 composite material. According to the material, a commercialized and easily available SAPO-11 molecular sieve is used as a catalyst carrier, and zinc proline activated by N-isopropyl-N-methylpropan-2-amine is loaded. The material can catalyze lactic acid polymerization to prepare lactide. Compared with a traditional catalyst, the catalytic material has the advantages that the coking yield can be reduced to be within 5%, and a small amount of generated coke is not adhered to a container and is easy to clean.

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.

The invention relates to the technical field of petrochemical catalysis, and discloses a rare earth metal modified ZMQ-1 molecular sieve catalytic cracking catalyst, which comprises the following components by weight: 30%-50% of a rare earth metal modified ZMQ-1 molecular sieve, the total content of rare earth metal and synergistic metal being 5%-15% of the weight of the molecular sieve; 20%-40% of a double-layer mesoporous composite oxide; 15%-25% of a binder; the rare earth metal is optionally selected from one of Ce and La, and the synergistic metal is optionally selected from one of Ni and Pt. The ZMQ-1 molecular sieve is modified by rare earth metal, and synergistic metal is introduced, so that the distribution of acidity and metal active centers is optimized, the adsorption and cracking capability on heavy hydrocarbon is enhanced, the selectivity of light hydrocarbon is improved, and the petrochemical industry is assisted to obtain high-added-value raw materials; the double-layer mesoporous composite oxide is constructed, the inner layer promotes the oxidation reduction reaction, the outer layer keeps the structure stable, particles are prevented from being broken and pulverized, the reaction stability is maintained, the cost is reduced, and multiple remarkable advantages are brought to catalytic cracking.

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 provides a heavy metal resistant auxiliary agent as well as a preparation method and application thereof. The heavy metal resistant auxiliary agent comprises 20%-60% of magnesium oxide, 30%-75% of aluminum oxide and 5%-20% of rare earth oxide; the magnesium oxide is provided by the first magnesium source and the magnesium-aluminum matrix material, and the aluminum oxide is provided by the first aluminum source and the magnesium-aluminum matrix material; the mass of the magnesium-aluminum matrix material is 5-25% of the total mass of the raw materials of the heavy metal resistant auxiliary agent; the magnesium-aluminum matrix material is obtained by mixing and crystallizing a second magnesium source and a second aluminum source subjected to peptizing treatment, and the magnesium-aluminum matrix material comprises magnesium oxide and aluminum oxide in a mass ratio of (0.2-0.8): 1. The invention also provides a preparation method and application of the additive. The heavy metal resistant auxiliary agent can significantly improve the heavy metal pollution resistance of the catalyst in the catalytic cracking process, and has the effects of excellent coke selectivity and light oil yield improvement.

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.

The invention discloses a sulfur-resistant methane dry reforming catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst is of a core-shell structure, an active component loaded by a carrier is taken as a core, and SiO2 is taken as a shell. The prepared novel sulfur-resistant methane dry reforming reaction catalyst adopts the NiRu nano-alloy as an active component, and has the characteristics of high catalytic activity and carbon deposition resistance; moO3 and V2O5 are adopted as assistants to adsorb H2S species to promote oxidative removal of the H2S species, and the sulfur resistance is enhanced. CeO2 is adopted as a carrier, the oxidation reduction environment can be adjusted through the oxygen storage capacity of CeO2, H2S species are reduced, metal particles are stabilized, CeO2 and a porous SiO2 shell can form a high-permeability framework structure, sulfur poisoning is delayed through the combined action of multiple components, and wide application prospects are achieved.