199 results about "Oxidation Activity" patented technology

The invention relates to an anti-oxidation composition based on a reverse micelle synergistic technology and a preparation method and application thereof, the anti-oxidation composition comprises a reverse micelle structure and an aqueous solution containing an anti-oxidation active matter, and the reverse micelle structure wraps the aqueous solution containing the anti-oxidation active matter. The reverse micelle structure is used for wrapping the water-soluble antioxidant active matter, oxidation or degradation discoloration of the water-soluble antioxidant active matter is prevented, after the antioxidant active matter such as hydroxytyrosol, ergothioneine and dipotassium glycyrrhizinate is wrapped by the reverse micelle, the stability and the effect are remarkably improved, and after the reverse micelle wrapping, the effect of the antioxidant active matter is improved by 17% or above compared with an aqueous solution before wrapping.

The invention discloses a high-entropy metal oxide catalyst as well as a preparation method and application thereof in CO catalytic oxidation, and belongs to the technical field of flue gas treatment. The preparation method comprises the following steps: dissolving copper salt, manganese salt, cerium salt, cobalt salt, vanadium salt and a dispersing agent into water to form a uniform solution, and slowly adding excessive alkali precipitant into the uniform solution to form a solid-liquid mixture; the solid-liquid mixture is transferred into a high-pressure kettle to be subjected to a hydrothermal reaction and then quenched, an obtained hydrothermal reaction product is calcined, and the high-entropy metal oxide catalyst is obtained and is high in catalytic oxidation activity on carbon monoxide at the low temperature, excellent in water resistance and sulfur resistance and particularly suitable for treatment of complex flue gas.

The invention relates to a lipase mutant and application thereof in preparation of epoxide, in particular to a lipase mutant which is derived from Tilletia indica and has remarkably improved peroxidation activity, a coding nucleic acid of the lipase mutant, a recombinant expression vector and a recombinant expression transformant containing a nucleic acid sequence, and an application of the lipase mutant in preparation of epoxide. The recombinant lipase or the recombinant expression transformant is used as a catalyst for preparing peroxy acid, and the peroxy acid reacts with olefin to generate epoxide. Compared with other methods (including a chemical method or a biological method and the like) for preparing alpha-epoxy pinane, the enzyme and the technical method thereof disclosed by the invention have the advantages of mild reaction conditions, environmental friendliness, lower cost, simplicity and convenience in operation, easiness in amplification and the like, and have a very good application prospect in the field of producing epoxy products by taking carbon-carbon double bonds as substrates.

The present invention discloses a Nitrospira The invention relates to nitrite oxidizing bacteria and their applications, belonging to the field of microbial and environmental protection technology. The strain is named Nitrospira sp. Z02, with a deposit number of GDMCC No: 66050, and was deposited in Guangdong Provincial Microbial Culture Collection Center on March 25, 2025. The strain is a new species, belongs to chemoautotrophic type, and expands Nitrospira The strains are diverse and can oxidize nitrite under different oxygen concentrations, have good adaptability to oxygen concentrations, retain oxidation activity within the pH range of 5.5 to 8.5, and can tolerate weakly acidic conditions. They can grow on solid plates and have the potential for molecular modification. Therefore, this strain has good application value in the treatment of nitrite-containing wastewater.

The invention belongs to the technical field of biological culture, and particularly relates to a chlorella extracellular fluid and a preparation method and application thereof.The preparation method of the chlorella extracellular fluid comprises the following steps that a BG11 culture medium is inoculated with a chlorella solution cultured to the logarithmic phase, oxcarbazepine is added, and the chlorella extracellular fluid is obtained; the preparation method comprises the following steps: placing chlorella in an intermittent illumination environment with the temperature of 20-30 DEG C and the rotating speed of 100-200 rpm for growth, centrifuging the chlorella to obtain supernate after the chlorella grows to the 10th-16th day, filtering, sub-packaging, and performing cryopreservation to obtain the chlorella extracellular fluid. By adding oxcarbazepine, the chlorella extracellular fluid prepared in a specific culture medium and a specific growth environment has high oxidation activity, excellent stability and excellent degradation capacity, and a new thought is provided for solving the pollution treatment problem of current environmental pollutants such as pharmaceutical products, polycyclic aromatic hydrocarbons and dyes.

The present invention discloses a method for regulating spinel-type high-entropy oxides using electrospinning. The method is characterized in that metal sources, polyacrylonitrile, and dimethylformamide of varying concentrations are fully mixed to form a precursor solution, followed by preparing a spinel-type high-entropy oxide having a nanofiber structure by electrospinning. Results show that, compared to conventional methods for preparing high-entropy oxides, electrospinning facilitates a lower phase transition temperature and promotes the formation of nanoscale high-entropy oxides. Furthermore, the fibers formed are significantly affected by the precursor solution. By varying the amount of total metal added, the final fiber state of the catalyst can be effectively regulated, exhibiting significant differences in ethyl acetate catalytic oxidation activity. The preparation process is simple, enhancing the application value of high-entropy oxides in the field of heterogeneous catalysis.

The invention provides a carrier material for supporting a protein drug. The carrier material comprises an inner core, a calcium carbonate coating layer coating the inner core and a polyethylene glycol-polyglutamic acid diblock copolymer chain segment anchored on the coating layer. The intracellular protein delivery carrier provided by the invention can effectively support various metal ions and protein drugs with the Fenton / Fenton-like reaction catalysis effect, and after the intracellular protein delivery carrier is endocytosed by cells, the protein drugs, calcium ions and the metal ions with the Fenton / Fenton-like reaction catalysis effect are released; metal ions can catalyze hydrogen peroxide in the endosome / lysosome to generate hydroxyl radicals with high oxidation activity, lipid molecules are oxidized, and a lysosome membrane is destroyed; the released calcium ions can cause mitochondrial calcium overload, improve the level of hydrogen peroxide in cells, promote generation of hydroxyl radicals in endosome / lysosome and damage of membranes of the hydroxyl radicals, induce efficient rupture of the endosome / lysosome and deliver protein drugs into cytoplasm so as to play the functions of the protein drugs.

The invention discloses a preparation method of a catalytic oxidation peroxyacetic acid self-release oxygen membrane and application thereof in the field of water treatment, and belongs to the technical field of water pollution control. The invention aims to solve the problems of unbalanced release rate and oxidation activity, self-decomposition loss of an oxidant, secondary pollution risk, and insufficient dynamic cleaning and long-acting anti-pollution capability in the traditional oxygen release technology. According to the invention, peroxyacetic acid is taken as an oxidizing agent, and a self-oxygen-release membrane for catalytic oxidation of peroxyacetic acid is taken as a catalyst, so that an oxygen-release membrane system is constructed, the water treatment efficiency and membrane performance are remarkably improved, the operation energy consumption of the system is greatly reduced, and an innovative solution is provided for development of an intelligent water treatment technology. The method has wide application scenarios, and is suitable for different water quality and treatment requirements. The high-efficiency degradation capability on pollutants such as antibiotics and endocrine pollutants is realized, the high-efficiency interception on complex pollutants such as humic acid, protein and colloid is realized, and the high-efficiency degradation capability is suitable for water supply sources, municipal sewage, industrial wastewater and reclaimed water treatment scenes.

The invention belongs to the technical field of sulfur recovery, and particularly relates to an organic sulfur hydrolysis synergistic sulfur recovery catalyst as well as a preparation method and application thereof. Comprising the following steps: (1) dissolving strontium salt; (2) adding transition metal salt; (3) adding a titanium source; (4) adding an alkali metal compound; (5) stirring reaction; (6) hydro-thermal treatment; and (7) centrifuging, washing, drying and roasting. The general formula of the prepared catalyst is SrTi (1-x) MxO3, in the formula, x is equal to 0.05-0.2, and M is a transition metal element. The prepared catalyst is high in material composition and structure adjustability, rich in surface acid-base sites, excellent in organic sulfur hydrolysis reaction activity and H2S selective oxidation activity, and capable of realizing efficient and synergistic proceeding of organic sulfur hydrolysis and H2S selective oxidation and removing sulfur-containing components in process gas in one step.

The invention relates to a high-stability palladium-based molecular sieve catalyst as well as a preparation method and application thereof. The high-stability palladium-based molecular sieve catalyst comprises an SSZ-13 hydrophobic modified molecular sieve and an active component loaded on the SSZ-13 hydrophobic modified molecular sieve, the active component comprises palladium oxide particles; based on 100 wt% of the total mass of the high-stability palladium-based molecular sieve catalyst, the content of the active component in the high-stability palladium-based molecular sieve catalyst is 0.5 wt%-5 wt%. According to the high-stability palladium-based molecular sieve catalyst, an SSZ-13 hydrophobic modified molecular sieve is used as a carrier, so that the adsorption capacity of the catalyst to water is weakened, the purpose of reducing water poisoning inactivation of palladium oxide substances is achieved, inactivation of the palladium oxide substances under the high-temperature hydrothermal condition is avoided, and the methane catalytic oxidation activity, the hydrothermal aging performance and the stability of the catalyst are obviously improved.

The invention discloses recombinant human VII type collagen as well as a preparation method and application thereof, and belongs to the technical field of biochemical engineering. The recombinant human VII type collagen comprises a plurality of amino acid residue repetitive units shown as SEQ ID NO.1. Compared with natural VII type collagen, the recombinant human VII type collagen obtained by repeating the repetitive units for multiple times has the advantages that the molecular weight is smaller, the sequence is more easily and efficiently secreted and expressed in a pichia pastoris system after optimization, and the recombinant human VII type collagen can be used for preparing the recombinant human VII type collagen. The method has the characteristics of high yield, low cost, simplicity in operation and easiness in large-scale production. Meanwhile, the anti-oxidation activity is excellent, the skin moisturizing and repairing capacity and the wound healing capacity are promoted, due to the fact that the collagen is derived from human collagen, the risks of allergy and rejection reaction can be remarkably reduced, and the safety is extremely high. Therefore, the recombinant collagen can be used as a core active component to be widely applied to the fields of cosmetics, medicines and the like, and has a good application prospect.

The invention relates to a transition metal nickel monatomic difunctional electrocatalyst and a preparation method and application thereof, and belongs to the technical field of carbon dioxide electrolysis. The catalyst takes a transition metal nickel monatomic as an active component, the loading capacity of the active component is 2-5wt.%, a nitrogen-doped carbon material is taken as a carrier, and the microstructure of the carrier is a rhombic dodecahedron with the particle size of 100-200nm. The difunctional electrocatalyst used in the invention has excellent double functions of carbon dioxide electroreduction and sulfur dioxide electrooxidation activity, is applied to the constructed novel carbon dioxide electrolysis system, has lower electric energy consumption and operation cost compared with the traditional electrolysis system, and has huge application potential.

The application discloses a bifunctional In-doped Ni2Mo3N@Mo2C binary heterojunction catalyst and a preparation method and application thereof. A dimethyl imidazole solution is slowly added into a Mo salt solution to obtain a suspension liquid containing a Mo metal organic framework Mo-MOF; the suspension liquid is left to stand, and a precipitate is centrifuged and washed, and vacuum dried to obtain the Mo-MOF containing the Mo metal organic framework; a Ni salt, an In salt and the Mo-MOF are added into an anhydrous ethanol solution to perform ion exchange, and the precursor is vacuum dried to obtain the bifunctional In-doped Ni2Mo3N@Mo2C binary heterojunction catalyst. The catalyst material has excellent basic oxygen evolution and urea oxidation activity, and has a good application prospect in electrocatalytic decomposition of water, urea-assisted electrolysis of water and treatment of sewage containing urea.

The invention discloses an oxidoreductase mutant and application thereof, and belongs to the field of enzyme engineering. The invention provides a recombinant oxidoreductase HbKR mutant which is used for catalytically producing (R)-decalactone. The oxidoreductase HbKR mutant disclosed by the invention realizes soluble expression in Escherichia coli BL21 (DE3), and the oxidation activity of the oxidoreductase HbKR mutant is improved by 4.61 times compared with that of a parent enzyme. An oxidoreductase HbKR mutant and lactone hydrolase Rpa3624 derived from Rhodopseudomonas palustris are combined for use, reaction is performed for 0.5 h under the conditions that the temperature is 35 DEG C and the pH value is 10.5, compared with a wild type, the yield of (R)-delta-decalactone is increased to 48.2% from 42.3%, and the stereoselectivity is increased to 98.7% from 94.2%.

The invention provides a preparation method of a Zn-Cr spinel oxide catalyst and application of the Zn-Cr spinel oxide catalyst in CO2-assisted ethane dehydrogenation, and relates to the technical field of composite catalysts. Wherein the Zn-Cr spinel oxide catalyst is prepared by firstly preparing a Zn1Crx oxide carrier by adopting a coprecipitation method and then loading Cr on the surface of the Zn1Crx oxide carrier by adopting an impregnation method, and in the process, strong metal-carrier interaction can be formed between the loading of Cr on the surface of the carrier and the Zn1Crx oxide carrier, so that the oxygen vacancy concentration on the surface of the catalyst is regulated and controlled and the desorption of ethylene is promoted; according to the present invention, the Zn1Crx carrier is used as the catalyst to inhibit the excessive oxidation of the Zn1Crx carrier so as to significantly improve the selectivity of ethylene, and the metal Cr forms the compact covering layer on the surface of the Zn1Crx carrier so as to reduce the number of the strong oxidation active sites, synergistically promote the rapid desorption of ethylene, and inhibit the occurrence of the side reactions such as dry reforming and hydrogenolysis.

The invention belongs to the field of catalytic materials, and particularly discloses a double noble metal supported molecular sieve catalyst for catalyzing oxygen to oxidize methane to prepare acetic acid. The preparation method comprises the following steps: mixing a chloroauric acid solution and another noble metal chloride solution as precursors with a molecular sieve, adjusting a certain pH value, stirring and aging at a proper water bath temperature for a certain time, and then filtering, drying and calcining to obtain the catalyst. According to the catalyst, a molecular sieve is used as a carrier, gold is used as an oxidation active center, carbon-carbon coupling is achieved with another precious metal, high-selectivity acetic acid preparation through methane pure oxygen direct oxidation can be achieved under the mild condition of 120-240 DEG C, and the selectivity reaches up to 97.2%. The catalyst preparation method adopted by the invention is simple in process, green and pollution-free, high in noble metal loading efficiency, low in price and easy for expanded production, and provides a thought for developing and preparing a high-efficiency catalyst for direct selective oxidation of methane under mild conditions.

The present invention relates to a composition, a kit and a detection method for detecting hydrogen peroxide on the basis of self-biotinylation according to the peroxidation activity of a guanine quadruplex, and, more specifically, to a composition, a kit and a detection method for detecting hydrogen peroxide, the composition comprising: i) a guanine quadruplex-hemin complex (G-quadruplex-hemin complex); ii) biotinyl tyramide; and iii) a probe capable of binding to the guanine quadruplex.

This invention provides a composite catalyst, its preparation method, and its application, as well as a method for the catalytic oxidation of alcohols to aldehydes, belonging to the field of organic synthesis technology. In the composite catalyst provided by this invention, elemental chromium improves the dispersibility of elemental silver on modified γ-Al₂O₃, thereby enhancing the oxidation activity of the composite catalyst for ethanol, reducing side reactions (further oxidation of aldehydes to acids or decomposition) during the catalytic oxidation of alcohols to aldehydes, and improving the selectivity, yield, and purity of aldehydes. The modified γ-Al₂O₃ has a more developed pore structure than uncalcined γ-Al₂O₃, and when used as a support, it improves the mechanical strength of the composite catalyst. Moreover, the composite catalyst provided by this invention reduces the reaction temperature and energy consumption for the catalytic oxidation of alcohols to aldehydes without affecting the alcohol conversion rate and aldehyde selectivity, thus reducing the cost of aldehyde preparation and making it more suitable for industrial use in the catalytic oxidation of alcohols to aldehydes.

The present invention relates to novel enzyme nanoparticles capable of converting methane into methanol, in which key active sites of methane-oxidizing bacteria are fused with each other and expressed on a protein that can be self-assembled in cells to form nanoparticles, and specifically to enzyme nanoparticles including a protein having methane monooxygenase (MMO) activity and active sites of the methane oxidase, a method for production thereof, a recombinant microorganism into which a nucleic acid encoding the protein and the active site of the methane oxidase is introduced, and immobilized enzyme nanoparticles including the enzyme nanoparticles loaded on a carrier.

The present application relates to a kind of anti-poisoning catalyst for blast furnace gas organic sulfur hydrolysis and its preparation method.Each component is as follows in percentage by weight: active component K2CO3 4-12%;Active component Cs2CO3 2-5%;Catalyst aid MoO3 3-8%;Catalyst aid La2O3 0.5-2%;Molding aid SiO2 1-5%;And composite metal oxide carrier Al2O3-TiO2 68-89.5%, the pore size of the composite metal oxide carrier Al2O3-TiO2 is three channel distribution.First, composite metal oxide carrier is prepared, and after being formed with silicon dioxide, active component and catalyst aid are impregnated to prepare catalyst.The catalyst prepared by the present application has excellent catalytic hydrolysis activity for organic sulfur in blast furnace gas, and has anti-sulfur, anti-chlorine and anti-oxygen poisoning performance and has persistent catalytic oxidation activity.

The present application relates to the technical field of non-noble metal catalysts, and provides a sulfur-doped cobalt-based material with a core-shell porous structure, which has Co nanoparticles as an inner core, and a porous carbon layer containing Co9S8 coated on the surface of the Co nanoparticles. The present application significantly enhances the catalytic capacity of the material by regulating the micro-morphology and surface active site composition and structure of the material through sulfur doping. On the one hand, the metal sulfide obtained by S doping improves the electrical conductivity of the catalyst, and on the other hand, the S element can regulate the microstructure and morphology of the material due to its strong reducing effect, so that S doping is beneficial to promoting the exposure of active sites and the diffusion of target molecule, thereby significantly enhancing the oxygen molecule activation efficiency and improving the benzyl alcohol oxidation activity and selectivity.

The invention discloses a label for time indication as well as a preparation method and a design method of the label. The label comprises a label main body, an oxidation color-changing film arranged on the surface of one side of the label main body, and an oxygen permeation regulation and control layer wrapping the label main body and the oxidation color-changing film. According to the label for time indication, the nano-metal material has high specific surface area and high oxidation activity, and the oxidation rate of the nano-metal material is not restricted by the passivation layer. Meanwhile, after the nano metal particles are coated with the high-molecular polymer film, a stable oxygen permeation rate of the film is controlled, a stable oxygen environment is provided for the label, the oxidation discoloration process of the label can be accurately controlled, and the label is in approximately linear positive correlation with the air contact time. The preparation method is simple and convenient, and the indication period of the label is adjusted by adjusting the activity of the oxidation discoloration rate regulating agent and the oxygen permeability of the oxygen permeability regulating layer.

The application discloses a high-entropy cluster electrocatalyst and a preparation method and application thereof, and the high-entropy cluster electrocatalyst comprises a supported substrate of graphene oxide nanosheet and high-entropy clusters in a spinel configuration anchored on the surface of the graphene oxide, and the high-entropy clusters comprise a high-entropy spinel oxide structure composed of multiple metals, wherein the metals are more than five kinds of Co, Mn, Ni, Zn, Cu, Cr and Mg. The application realizes anchoring of the high-entropy oxide clusters on the surface of the graphene oxide, and the multi-component synergistic effect and the heterojunction charge optimization characteristics of the high-entropy oxide clusters improve seawater oxidation activity; the high-entropy stability characteristics and the strong carrier interaction promote the seawater oxidation stability of the catalyst, and the catalyst has better alkaline seawater oxidation performance.

The invention relates to the field of food additives and pharmaceutical preparations, and discloses a preparation method and application of high-stability ferrous glycinate. Glycine and ferrite are sequentially subjected to pretreatment, anhydrous solvent system construction, primary-secondary gradient coordination, antioxidant directional integration, low-temperature programmed crystallization and surface hydrophobization treatment. Wherein the natural antioxidant is subjected to nano coating by adopting a supercritical CO2 deposition technology, so that the controllable release of the antioxidant activity is realized; the coordination kinetics is optimized through ultrasonic intervention, and the Fe-S bond bonding strength is enhanced; and a multi-stage protective barrier is formed by combining fumed silica surface treatment and an oxygen barrier packaging process. The problems that a traditional iron agent is prone to oxidation inactivation and moisture absorption caking and low in bioavailability are effectively solved, and the chemical stability and physical integrity of a product in a complex environment are remarkably improved.

The invention discloses a method for improving salty taste and antioxidant activity of agaricus bisporus taste-active peptide. The method comprises the following steps: S1, pretreatment: cleaning, slicing, drying and crushing fresh agaricus bisporus to obtain agaricus bisporus powder; s2, first-step enzymolysis: uniformly mixing the agaricus bisporus powder with water, adding neutral protease for enzymolysis, and synchronously performing ultrasonic treatment in the enzymolysis process; s3, enzyme deactivation treatment; s4, second-step enzymolysis: adding flavourzyme for enzymolysis, and synchronously performing ultrasonic treatment in the enzymolysis process; s5, performing enzyme deactivation treatment; s6, separating and refining to remove substances insoluble in water; s7, concentrating; and S8, drying and crushing to obtain the flavor peptide powder. According to the method, two-step enzymolysis is performed, and synchronous ultrasound is introduced in the two-step enzymolysis process, so that the saltiness increasing capacity of the agaricus bisporus flavor peptide is improved, and the oxidation activity is improved.

The invention belongs to the field of chemical engineering, and relates to a long-acting anti-oxidation bismuth vanadate pigment for a coating and a preparation method thereof, and the preparation method comprises the following steps: preparing a bismuth vanadate matrix by adopting a sol-gel method; and grafting a tea polyphenol derivative EGCG-COOH on the surface of the bismuth vanadate matrix. According to the long-acting anti-oxidation bismuth vanadate pigment for the coating and the preparation method of the long-acting anti-oxidation bismuth vanadate pigment, the bismuth vanadate matrix is prepared by adopting a sol-gel method, the particle size can be strictly controlled, and excellent optical performance is ensured; rich hydroxyl groups can be formed on the surface of bismuth vanadate prepared by a sol-gel method, so that ester bonds can be formed with carboxyl groups of EGCG-COOH, and the grafting efficiency is improved; eGCG-COOH is used as a bio-based anti-oxidation layer to improve the long-acting anti-oxidation performance of the bismuth vanadate pigment, the release rate of EGCG can be regulated and controlled through carboxyl modification, the anti-oxidation activity is prolonged, and the durability of the anti-oxidation layer is remarkably improved.

The invention discloses a FeOOH / BiVO4 composite photo-anode, a temperature synergistic activation method for optimizing the performance of the FeOOH / BiVO4 composite photo-anode and application of the FeOOH / BiVO4 composite photo-anode, and belongs to the technical field of photoelectric catalytic materials and new energy. The FeOOH / BiVO4 composite photo-anode is formed by loading a cocatalyst layer FeOOH on the surface of a BiVO4 nano-structure substrate. The core of the invention lies in finding that the specific composite photo-anode system has a unique temperature-activity synergistic effect at an electrolyte temperature of about 40 DEG C. At the temperature, the FeOOH cocatalyst and the BiVO4 substrate not only exert respective catalytic advantages, but also realize maximization of interface charge transfer efficiency and remarkable acceleration of reaction kinetics through temperature field regulation and control, so that the photoelectrocatalytic water oxidation activity reaches a peak value, and the stability is far superior to that of a single BiVO4 photoanode. According to the method, a composite material system and the optimal working temperature of the composite material system are accurately matched, so that the cooperation of material design and working condition optimization is realized, and a new technical path and theoretical guidance are provided for developing efficient and stable composite photoelectric devices.

A method for improving the denitrification efficiency of a sulfur autotrophic denitrification and anaerobic ammonia oxidation coupling system comprises the following steps: S1, when the denitrification load is limited and the mass transfer rate in particles is reduced, determining the abundance of filamentous bacteria or determining the length of filaments outside sludge through a molecular biological technique to judge whether the filamentous bacteria overgrow or not; when the abundance ratio of the filamentous bacteria reaches 10%-50% or the length (FLA) of the filamentous substances outside the sludge is 10-50 microns, it can be judged that the filamentous bacteria grow excessively; and S2, continuously adding a hydroxylamine conditioning agent and / or a hydrazine conditioning agent into the reactor, and operating the reactor for 10-30 days. According to the method, excessive reproduction of filamentous bacteria in the coupling system can be effectively controlled, more importantly, the denitrification performance of the coupling system can be improved, the anaerobic ammonia oxidation activity is enhanced, and therefore the operation efficiency of the coupling system is promoted.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a diesel vehicle oxidation catalyst with high NO oxidation performance and a preparation method thereof. The catalyst comprises a carrier, the carrier is coated with an active coating, the active coating comprises precious metal, cerium oxide and silicon-aluminum composite oxide, the mass ratio of the cerium oxide to the silicon-aluminum composite oxide is 1: (49-69), and the coating amount of the precious metal is 0.5-0.9 g / L; the noble metal is Pt and Pd, the mass ratio of the noble metal Pt to the noble metal Pd is (3-9): 1, and the precursor of the noble metal is pretreated for 1-2 hours at normal temperature by using a reducing acid solution. The oxidation catalyst for the diesel vehicle is high in NO oxidation activity and excellent in HC / CO ignition performance, and the preparation process is simple and controllable.

This invention belongs to the fields of industrial hazardous waste resource utilization, photothermal synergistic catalytic materials, and VOCs treatment technology. Specifically, it relates to a VN / GaN aerogel photothermal catalyst based on in-situ vanadium nitridation of spent SCR catalyst, its preparation method, and its application. The preparation method includes: selectively leaching vanadium from spent SCR denitrification catalyst; using vanadium-containing DES leachate directly as a vanadium source and spinning aid, compounding it with gallium nitrate and the spinning aid to prepare an electrospinning precursor solution; obtaining precursor fibers through electrospinning; calcining in air to obtain V2O5 / Ga2O3 nanofibers; high-temperature nitriding with ammonia to form VN / GaN composite nanofibers; and ultrasonic dispersion, aging, and freeze-drying to prepare the aerogel photothermal catalyst. This invention achieves green, high-value, closed-loop utilization of vanadium in hazardous waste, and the prepared aerogel catalyst possesses both excellent photothermal conversion performance and toluene catalytic oxidation activity.