169 results about "Catalytic function" patented technology

The invention relates to the technical field of air electrode preparation, in particular to a metal-loaded super-hydrophobic air electrode, a preparation method and chlorine production application, the air electrode comprises a high-hydrophobicity gas diffusion layer obtained through polytetrafluoroethylene modification, and the metal-loaded super-hydrophobic air electrode is prepared through a corona etching and electrochemical in-situ deposition technology. A uniform and highly-dispersed metal catalyst layer directly grows on the surface of the polytetrafluoroethylene substrate, so that the gas diffusion electrode with excellent mass transfer performance and an efficient catalytic function is obtained; the prepared electrode is used for carrying out electrochemical catalysis on a water body containing chloride ions by adopting a cyclic voltammetry method, and active chlorine can be efficiently generated in situ; the prepared metal-loaded super-hydrophobic air electrode has the advantages of being low in oxygen mass transfer resistance, high in catalyst utilization rate, free of generation of by-products, capable of efficiently generating active chlorine and the like, and has wide application potential in actual water environment disinfection.

The invention discloses a fusion protein which comprises a first structural domain with an EgtD catalytic function, a second structural domain with an Egt1 catalytic function and a third structural domain with an EgtE catalytic function, and the amino acid sequence of the first structural domain with the EgtD catalytic function is shown as SEQ ID NO.1; the amino acid sequence of the second structural domain with the Egt1 catalytic function is as shown in SEQ ID NO. 2; and the amino acid sequence of the third structural domain with the EgtE catalytic function is as shown in SEQ ID NO. 3. The fusion protein is subjected to heterologous expression in engineering bacteria, so that the yield of ergothioneine is remarkably increased.

The invention belongs to the field of genetic engineering and synthetic biology, and provides a novel cytochrome P450 enzyme derived from cephalotaxus plants, a nucleotide, a carrier and a host of the cytochrome P450 enzyme, and application of the cytochrome P450 enzyme in preparation of cephalotaxane diterpenoid compounds. The cytochrome P450 enzyme provided by the invention has multiple catalytic functions, can efficiently catalyze oxidation of C-5 site and C-19 site of cephalotaxene, lays a solid foundation for analysis of a cephalotaxane diterpene biosynthetic pathway, and provides a new method for obtaining important active molecules such as cephalotaxus hainanensis lactone and the like by adopting a synthetic biological means.

The invention discloses a catalyst for dealkylation in a chlorine-containing environment as well as a preparation method and application of the catalyst, and belongs to the technical field of catalyst reaction. The catalyst comprises a carrier and an active component, wherein the carrier comprises ZrO2 and MgFeO4; the active component comprises an auxiliary agent and a noble metal component, the auxiliary agent comprises a V2O5-WO3 composite oxide and a CeO2-MnO2 composite oxide, and the noble metal component comprises at least three of rhodium, ruthenium, platinum, palladium and gold. The noble metal components grow in mesopores of the carrier in a confined manner, and the auxiliaries with dechlorination and catalytic oxidation functions are uniformly distributed on the surface of the carrier, so that a two-step catalytic strategy of dechlorination and oxidation of chlorine-containing waste gas is realized, the poisoning phenomenon of the catalyst is effectively avoided, and an excellent catalytic effect is formed. Moreover, the catalyst is stable in property, still keeps an excellent catalytic function after being used for a long time, and is higher in practicability and better in economical efficiency.

The invention relates to the technical field of polyurethane coatings, and discloses an antibacterial waterborne polyurethane-chitosan compound, a preparation method thereof and a coating, the antibacterial waterborne polyurethane-chitosan compound comprises the following raw material components: chitosan, oligomeric polyol, diisocyanate, a chain extender, a cross-linking agent, a neutralizer, a catalyst and a modified compound, the modified compound comprises graphene oxide, nano titanium oxide, a sensitizing agent and a dispersing agent. In the technical scheme provided by the invention, the nano titanium oxide can play a role in coordination crosslinking among molecular chains and play a synergistic role with the dispersing agent, so that the dispersion uniformity of the modified compound in polyurethane is improved, and meanwhile, the nano titanium oxide can be used as a catalyst for photocatalytic oxidation reaction to oxidize bacteria and fungi, so that the antibacterial effect is realized; by adopting the sensitizer, the applicable light wavelength range when the nano titanium oxide plays a catalytic function can be expanded, the light aging effect of light on the polyurethane material is reduced, and the antibacterial effect of polyurethane is improved.

The invention discloses a fresh plant directed biotransformation method based on endogenous enzyme activation and a product and application thereof. The core of the preparation method is as follows: fresh plants (tuberous roots, stems or fruits) which are harvested in a ripe state and have metabolism in a dormant state (the respiration rate is lower than 5 mg CO / kg.h) are taken as raw materials, the raw materials are treated in an environment with the specific pressure being 0.02-0.20 MPa, the temperature being 70-121 DEG C and the humidity being 50-95%, a specific impregnating compound can be selectively combined, and the raw materials can be prepared into the plant culture medium. Under the conditions that exogenous microorganisms are not introduced and plant tissue structures are not damaged, the catalytic function of an endogenous metabolic enzyme system is safely and efficiently restarted and maximally promoted, and components of a plant body are driven to realize directional biotransformation. According to the process, conversion of primary metabolites and / or secondary metabolites is remarkably promoted, the content conversion of one or more beneficial components in the primary metabolites and / or the secondary metabolites is improved, and meanwhile, the biological and pharmaceutical structures and inherent metabonomics characteristics of the plants are completely reserved. The biotransformation product can be used as a high-quality raw material to be applied to medicines, common foods, health foods, special diet foods, daily chemical products and disinfection products, and can be further prepared into traditional Chinese medicine decoction pieces, solid preparations, semi-solid preparations and liquid preparations by adding or not adding pharmaceutically acceptable auxiliary materials.

The invention discloses a method for producing ergothioneine by fermentation of a mixed strain. The method comprises a step of performing mixed fermentation on a high-yield histidine EGT strain and a histidine defect type EGT strain to obtain ergothioneine, the high-yield histidine EGT strain and the histidine defect type EGT strain both comprise fusion proteins with EgtD, Egt1 and EgtE catalytic functions. According to the present invention, the fermentation is performed by using the method, such that the yield of the ergothioneine is high, the histidine does not need to be added during the fermentation process so as to save the cost, and the method is suitable for the industrial production of the ergothioneine.

The present disclosure relates to a carbon dioxide reduction reaction (CO2RR) catalytic system having a dual catalysis function for the electroreduction of CO2 into multi-carbon products, the catalytic system comprising: a first catalyst layer comprising a support and a first metal-based catalyst that is configured to sustain reduction of CO2 into CO, wherein the first metal-based catalyst is atomically dispersed on the support; and a second catalyst layer comprising a second metal-based catalyst that is configured to sustain C—C coupling mechanisms to yield multi-carbon products from CO; wherein the first catalyst layer is positioned above the second catalyst layer to generate CO between the first catalyst layer and the second catalyst layer.

The invention discloses a method for detecting the protein catalytic function of carrot lycopene beta-cyclase, and belongs to the technical field of protein catalytic function detection. According to the method for detecting the catalytic function of the carrot lycopene beta-cyclase protein, escherichia coli is used as a heterologous expression host, a lycopene substrate is accumulated in the escherichia coli by expressing pACCRT-EIB plasmids, then lycopene epsilon-cyclase protein and lycopene beta-cyclase are constructed on the same carrier for co-expression, and the lycopene beta-cyclase protein is obtained. A monocyclic carotene intermediate product in the process of converting lycopene into carotene is introduced into a reaction system so as to detect the substrate preference and functional difference of two lycopene beta-cyclase isoenzymes. The method is easy to operate, expression in an escherichia coli system is convenient and rapid, various lycopene beta-cyclase catalytic substrates except lycopene can be provided, and the catalytic function of lycopene beta-cyclase protein can be identified more accurately.

The invention belongs to the technical field of functional metal cluster preparation, and particularly relates to a platinum cluster with nano-enzyme and visible light catalysis functions and a preparation method and application thereof. The platinum cluster takes 6-aza-2-thiothymine as a ligand and platinum salt as a precursor, arginine is added to modify the ligand, and the platinum cluster is synthesized through a hydrothermal method. The platinum cluster is suitable for an environment with a pH value of 3-7.4. The platinum cluster disclosed by the invention has relatively high peroxidase activity and visible light catalytic activity.

The invention provides an environment-friendly dust removal filter bag for waste incineration flue gas, and belongs to the technical field of dust removal filter bags. Comprising a dedusting filter bag body, the dust removal filter bag body is formed by sequentially and fixedly connecting a gradient filter layer, a catalytic functional layer and an anti-corrosion surface layer, and is used for intercepting a large amount of dust and fly ash contained in waste incineration flue gas; the catalytic structure is arranged in the catalytic functional layer and is used for supporting the dust removal filter bag body and carrying out catalytic decomposition on passing harmful gas; the gas guide structure is arranged at the bottom of the gradient filter layer and is used for enabling the flue gas to generate rotational flow, and coarse particles in the flue gas settle in advance. Through the three-layer composite structure of the gradient filtering layer, the catalytic function layer and the anti-corrosion surface layer, the pore diameters of the three-layer composite structure are sequentially decreased, and meanwhile, the gradient filtering function and the catalytic function are integrated in the dustproof filter bag, so that ultralow emission of PM2.5 is achieved, physical interception and chemical purification of waste incineration flue gas are coordinated, and the problem of cooperative treatment of multiple pollutants is solved.

The invention discloses a method for high-temperature solid-phase synthesis of a spessartite ceramic membrane with a catalytic function and application of the spessartite ceramic membrane, and belongs to the technical field of functional ceramic composite materials and preparation of the functional ceramic composite materials. The problems that an existing ceramic membrane with a catalytic function is low in permeation flux and low in catalytic efficiency are solved. Aluminum oxide, silicon dioxide and manganese dioxide are used as raw materials, a high-temperature solid-phase synthesis method is adopted, and in the sintering process of the ceramic membrane, aluminum oxide, silicon dioxide and manganese dioxide in membrane holes are subjected to a solid-phase synthesis reaction to generate spessartite (Mn3Al2 (SiO4) 3) with high catalytic activity, so that the combination of a catalyst and the ceramic membrane is tighter, and the catalytic activity of the catalyst is improved. The problems that the catalyst is lost and the membrane holes are blocked and the permeation flux is reduced due to the fact that the catalyst enters the membrane holes in the traditional ceramic membrane preparation process are effectively prevented. Meanwhile, through the space confinement effect of the membrane holes, the free radical concentration in the membrane holes is improved, and the pollutant removal efficiency is enhanced.

The invention discloses difunctional catalysis-adsorption Chinese art paper based on fiber structure modification and application of the difunctional catalysis-adsorption Chinese art paper in baijiu aging, and belongs to the technical field of baijiu production. According to the Xuan paper, raw Xuan paper serves as a base body, a catalytic function layer containing metal ions, an organic acid catalyst and nano bentonite is formed through an impregnation technology, and esterification reaction can be promoted; an adsorption layer containing a modified ZSM-5 molecular sieve or activated carbon fiber is formed on the surface through electrostatic spinning, and C3-C5 aldehydes, sulfides and other impurities can be selectively adsorbed. A micro-aerobic environment is maintained by utilizing a Chinese art paper porous structure, a synergistic effect of catalysis and adsorption is realized, the ageing period of a white spirit ceramic jar can be shortened, the quality of a white spirit body is improved, and the problems of low efficiency and difficulty in flavor regulation and control of a traditional jar sealing mode are solved.

The invention belongs to the technical field of ion exchange membranes, and relates to a composite membrane with a high ion selective catalytic function and a preparation method thereof. The composite membrane has a three-layer structure, namely a high-ion-selectivity base membrane doped with a microporous material and catalytic functional composite layers doped with a positive electrode catalyst and a negative electrode catalyst on two sides of the base membrane. The preparation method comprises the following steps: firstly, dissolving perfluorinated sulfonic acid resin in an organic solvent, then dividing the obtained solution into three parts, and respectively adding a microporous material, a positive electrode catalyst and a negative electrode catalyst into the three parts for dispersion; after concentration treatment, a step-by-step tape casting mode is adopted to sequentially prepare a high-ion-selectivity base membrane, a positive electrode catalytic function composite layer and a negative electrode catalytic function composite layer, and finally, the three layers are compounded to form the high-ion-selectivity catalytic function composite membrane. The prepared composite membrane endows the flow battery diaphragm with a catalytic function; through fusion of the catalyst and the diaphragm resin, the problem of catalyst shedding is solved, and the conductivity and the ion barrier ability of the diaphragm are improved at the same time.

The invention discloses Cu / CuO / Ag nano-particles and a preparation method and application thereof, and the method successfully prepares the Cu / CuO / Ag nano-particles with regular morphology and uniform dispersion by optimizing a dual-stabilizer system and a step-by-step reduction-replacement process. The material has dual functions of SERS enhancement and catalysis: as an SERS substrate, the enhancement factor of rhodamine 6G reaches 5.3 * 10 < 8 >, the detection limit is as low as 5.0 * 10 <-13 > mol / L, and the reproducibility is good (RSD = 6.2%); meanwhile, as a catalyst for hydrazinolysis and reduction reaction, by optimizing a reaction solvent and the pH value of a system, the reaction efficiency is remarkably improved, and an additional incubation step is not needed. The detection limit on the plasticizer DOTP can reach 2.0 * 10 <-9 > mol / L, and the method has the advantages of simplicity and convenience in operation, good reproducibility, high analysis speed and the like, and is suitable for rapid screening and quantitative analysis of plasticizers in food packaging, environmental water bodies and medical instruments.

The invention discloses a difunctional alcohol dehydrogenase derived from Geobacillus thermodenitrifis, the difunctional alcohol dehydrogenase takes NAD < + > as a cofactor, can specifically catalyze a continuous oxidation reaction of omega-hydroxy fatty acid, and catalyzes the omega-hydroxy fatty acid to synthesize alpha, omega-binary fatty acid through single enzyme catalysis without an aldehyde intermediate. The alcohol dehydrogenase has dual catalytic functions of alcohol oxidation and aldehyde oxidation, the oxidation process from hydroxymethylene to carboxyl can be completed in one step, the reaction steps are simplified, accumulation and separation of intermediate aldehyde are avoided, the conversion efficiency is improved, and the alcohol dehydrogenase is alpha, omega-dibasic fatty acid and is a novel alcohol dehydrogenase. The invention provides a simple and efficient biocatalysis way for biosynthesis of dodecanedioic acid, especially dodecanedioic acid, and has important industrial application value.

The present invention proposes the inhibition of the catalytic function of the SWI / SNF complex in patients with NUT carcinoma, to promote the differentiation and specific death of tumour cells. Specifically, inhibitors of the activity of the SMARCA4 and / or SMARCA2 catalytic subunits of the SWI / SNF complex, for the use thereof in the treatment of NUT carcinoma, are described.

The application provides a preparation method of a Pickering type SCR catalytic functional emulsion containing composite metal oxide particles. The composite metal oxide particles prepared by a wet chemical method are used as emulsifiers, water is used as a continuous phase, and a water-insoluble organic solvent is used as a dispersed phase. The stable O / W type catalytic functional emulsion is obtained by high-speed shearing homogenization and emulsification in a sealed container. The composite metal oxide nanoparticles with no irritation, high low-temperature catalytic activity and easily available raw materials are used as the SCR catalyst and emulsifier to replace the traditional surfactant. The Pickering type SCR catalytic functional emulsion prepared by the application has better dispersion performance and stability than the catalytic functional emulsion stabilized by the traditional surfactant. The preparation method is simple, the prepared emulsion can be uniformly loaded on the surface of various filter carriers, the reaction activity of the catalyst is well reserved, and the binding firmness between the catalyst and the filter carrier is high.

The present application relates to the technical field of conductive foil, specifically to a multilayer composite conductive foil and its preparation method and application, specifically comprising the following steps: S1. aluminum foil is immersed in NaOH solution and then cleaned with deionized water, dried to obtain pretreated aluminum foil; S2. using a magnetron sputtering instrument, using a Ti-Zn-C-Ni composite target material to sputter the pretreated aluminum foil, and obtaining a transition layer conductive foil after deposition; S3. the modified functional slurry is coated on the surface of the transition layer conductive foil by a doctor blade coater, then added to an oven for segmented curing, and then annealed, and after cooling to room temperature, a multilayer composite conductive foil is obtained. The present application forms a strong adhesion bottom layer with the substrate through the composite process design of sputtering and coating, blocks the corrosion of electrolyte to the substrate, and also bears the conductive and catalytic functions. The two functional layers obtained by the two processes are further fused through annealing treatment, forming a gradient interface, eliminating interlayer stress, and improving the overall structural stability.

The invention belongs to the technical field of electrodes, and discloses a preparation method of a titanium-based anti-scaling cathode with an electrolyzed water catalysis function, which comprises the following steps: constructing a microstructure on the surface of a titanium mesh substrate; a transition metal catalyst is loaded on the microstructure; the surface of the microstructure material with the catalytic function is coated with an inert coating. The inert coating on the surface of the cathode can prevent electrons from being in contact with water molecules, so that only the tip of the microstructure which is not covered by the inert coating serves as an initial nucleation site of the crystal. When the crystal grows to a micron order, the adhesive force between the crystal and the tip of the microstructure is weakened. Meanwhile, bubbles generated by electrolyzing water can grow along the inert coating and crack near the tip of the microstructure to push the crystals to fall off spontaneously, so that the crystals are prevented from being deposited and accumulated on the surface of an electrode. And meanwhile, metal cations such as Ni < 2 + > and Co < 2 + > loaded on the microstructure can reduce the overpotential of electrolyzed seawater. Due to the two properties, the cathode can be applied to extraction of magnesium resources in seawater.

The invention belongs to the technical field of tea tree gene application, and particularly relates to application of a tea tree CsPHT gene in improving tea geometrid and colletotrichum gloeosporioides resistance of a tea tree. The invention discloses a tea tree CsPHT gene, the nucleotide sequence of the tea tree CsPHT gene is as shown in SEQ ID NO.1, the tea tree CsPHT gene codes 434 amino acid residues, and the amino acid sequence of the tea tree CsPHT gene is as shown in SEQ ID NO.2. The CsPHT gene is proved to be capable of catalyzing biosynthesis of tea tree defense related compounds such as feruloyl putrescine, coumaroyl putrescine and cinnamoyl putrescine for the first time, and the conservation of the catalytic function of the CsPHT gene is proved through heterologous expression. An in-vivo instantaneous function verification result of a tea tree shows that the over-expression of the CsPHT gene can significantly improve the resistance of the tea tree to tea geometrid and tea anthracnose bacteria. The CsPHT gene is proved to be a key positive regulation factor for regulating the resistance of the tea tree to the tea geometrid and the tea anthracnose fungus. The invention provides important gene resources and molecular targets for cultivating new varieties of high-resistance and multi-resistance tea trees.

The invention relates to a side-arm effect regulated chiral super-crosslinked polymer catalyst and a preparation method thereof, and aims to solve the problem of poor asymmetric catalytic activity caused by too strong rigidity of a super-crosslinked polymer skeleton prepared by taking an aromatic compound as a monomer. The preparation method comprises the following steps: 1, dissolving amine with a catalytic function, an aromatic derivative and a condensing agent in an organic solvent, and carrying out condensation reaction at the temperature of 35-40 DEG C to obtain a chiral super-crosslinking monomer; 2, mixing the chiral super-crosslinking monomer, a ferric trichloride catalyst, a crosslinking agent and a reaction solvent, and reacting at the temperature of 50-100 DEG C to obtain a chiral porous super-crosslinking polymer precursor; and 3, mixing and reacting the chiral porous super-crosslinked polymer precursor, organic alkali and a solvent. Diversified modification of flexible side arm groups in holes is realized by adjusting the structure of the cutting agent. The in-hole microenvironment is adjusted through side arm groups, the activity and catalytic characteristics of the catalyst are regulated and controlled, and the asymmetric catalytic activity and enantioselectivity are improved.

To provide a honeycomb structure that can realize an economical filter with catalytic function. [Solution] The honeycomb structure has multiple channels through which a fluid passes, and comprises a base material and a catalyst. The base material is provided with a first channel whose fluid outlet end face is sealed and a second channel whose fluid inlet end face is sealed. The catalyst is packed into at least one of the first and second channels.

The application provides a key enzyme involved in glycosylation modification of triterpene saponins, and an application thereof, and belongs to the technical field of genetic engineering. The glycosyltransferase gene is screened based on the omics research of the base plant of traditional Chinese medicine Duanxueliu, i.e. clinopodium gracile, and a pET28a-MBP-CcGT-g51295 prokaryotic expression vector is constructed to successfully obtain the glycosyltransferase. It is found that the glycosyltransferase can catalyze Saikogenin A and Saikogenin F to generate Prosaikogenin A and Prosaikogenin F respectively by using a glycosyl donor UDP-fucose; can catalyze Saikogenin A to generate clinopodiside I and clinopodiside X by using UDP-glucose; can catalyze Prosaikogenin A to generate Saikosaponin B1, Saikosaponin c1 and Saikosaponin X by using UDP-glucose; and can catalyze Prosaikogenin F to generate Saikosaponin A and Buddlejasaponin IV by using UDP-glucose, which reveals the catalytic function of the glycosyltransferase and provides a gene component for the biological research of triterpene saponins, and solves the problem of biological resources of rare saponins.

The invention discloses a ship tail gas denitration and decarburization integrated turbulent flow assembly. The assembly comprises a denitration tower and a decarburization tower which are connected in series. A multi-stage active turbulent flow structure is arranged to strengthen the mass transfer process, a first turbulent flow module made of a catalytic material is additionally arranged in the denitration tower and above a first spraying mechanism and a denitration catalyst, a venturi type cavity is formed in the module, a strong vortex is generated through airflow acceleration and diffusion, and the deep mixing and supplementary catalysis functions are achieved. And a second turbulent flow assembly formed by pore plates is arranged in the decarburization tower and is used for optimizing airflow distribution and creating efficient mass transfer conditions for decarburization liquid which is sprayed downwards. According to the assembly, the gas-liquid mixing efficiency and the reaction rate are systematically improved through a precisely designed turbulent flow structure, so that efficient synergistic removal of NOx and CO2 in ship tail gas is realized in a compact space.

The invention discloses a TEMPO-CNT composite membrane based on layer-by-layer assembly, a preparation method and application, and belongs to the technical field of preparation of electrochemical wastewater treatment materials. According to the composite membrane, a layer-by-layer assembly process is adopted, a carbon-based conductive adsorption layer and a TEMPO catalytic function layer are sequentially constructed on a substrate layer, and an ordered layered structure is formed. According to the structure, the high specific surface area and conductivity of the carbon material are fully reserved, TEMPO active sites are uniformly exposed, and efficient cooperation of pollutant adsorption and electrocatalytic degradation is achieved. The composite membrane prepared by the invention can be adapted to various electrochemical systems such as direct current and alternating current (pulse), trace organic pollutants in wastewater can be efficiently removed with low energy consumption by applying corresponding voltage, and the composite membrane has the advantages of flexible operation, wide application scene, good environmental compatibility and the like.

This invention provides an Ag-doped photocatalytic composite membrane, its preparation method, and its application, relating to the field of water treatment membrane technology. The Ag-doped photocatalytic composite membrane of this invention has a composite functional structure consisting of a polyester nonwoven fabric support layer, a PVDF base membrane core layer, an Ag-BaTiO3 / ZnIn2S4 piezoelectric-photocatalytic functional layer, and a polydopamine hydrophilic protective layer, arranged sequentially. By constructing an Ag-doped dual piezoelectric coupled heterojunction system, introducing the surface plasmon resonance effect of Ag ions, and combining plasma-assisted deposition technology with the composite functional structure, this invention achieves a wide spectral response (UV to near-infrared), highly efficient piezoelectric-photocatalytic synergistic degradation, robust catalyst adhesion to prevent detachment, and multiple effects of "separation-degradation-self-cleaning." This solves the problems of traditional piezoelectric-photocatalytic membranes in terms of catalytic efficiency, long-term stability, and industrial adaptability, and has good application prospects.

The invention relates to the technical field of low-temperature NH-SCR denitration catalytic materials and preparation thereof, in particular to a filter bag integrated supported denitration catalyst and a preparation method thereof.The filter bag integrated supported denitration catalyst comprises a modified fiber filter bag and a catalytic material supported on the modified fiber filter bag, and the catalytic material comprises magnesium-aluminum composite oxide and manganese-containing oxide; the content of the magnesium-aluminum composite oxide accounts for 70-90%, the magnesium-aluminum composite oxide is a mixture of a mixed metal oxide and spinel, and the molar ratio of Mg to Al is (2: 1)-(4: 1); the content of the manganese-containing oxide accounts for 10%-30%, and the manganese-containing oxide comprises MnO, MnO and MgMnO; the magnesium-aluminum composite oxide and the manganese-containing oxide are loaded on the surface of the modified fiber filter bag, efficient removal of nitric oxide (NOx) under the low-temperature condition is achieved, meanwhile, the dust removal and catalysis functions are integrated, and the low-temperature catalytic purification device is suitable for low-temperature catalytic purification treatment of nitric oxide in industrial flue gas.

The invention relates to a damascenone synthetase which can catalyze grasshopper ketone to be converted into a damascenone precursor and can have a unique two-way catalytic function. The enzyme and the coding gene thereof can be used for efficiently producing beta-damascenone in microorganisms or plants, and have wide application prospects in flavor improvement and perfume industry.

Provided is a method for forming a graphene structure without forming a catalytic metal layer and activating the same, the graphene structure forming method including: a step of preparing a substrate to be processed; and a step of forming a graphene structure on a surface of the substrate to be processed by using a carbon-containing gas as a film forming raw material gas in a state in which the surface of the substrate to be processed has no catalytic function, and performing remote microwave plasma CVD.