46results about How to "Meeting the needs of industrial applications" patented technology

The invention discloses a CHA molecular sieve, a synthesis method thereof, and a denitration SCR catalyst synthesized by using the CHA molecular sieve. In the CHA molecular sieve, the molar ratio of silicon dioxide to aluminum oxide ranges from 5 to 75, the grain size ranges from 0.3 micrometer to 2 micrometers, after CHA molecular sieve raw powder is subjected to saturated steam treatment at thetemperature of 600 DEG C to 850 DEG C, tetra-coordinated aluminum accounts for more than or equal to 92 percent of the total aluminum amount, and the hexa-coordinate aluminum accounts for less than orequal to 8% of the total aluminum amount. The synthesis method comprises the step of synthesizing by using a composite organic template agent formed by a quaternary ammonium onium compound containingtetrahydronaphthalene or decahydronaphthalene groups and an N, N, N-dimethyl ethyl cyclohexyl quaternary ammonium onium compound. The molecular sieve disclosed by the invention has high hydrothermalstability under the condition of not having a large grain diameter, and the SCR catalyst disclosed by the invention also shows high nitrogen oxide reduction characteristics after being exposed at hightemperature and high humidity, and particularly shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The invention discloses a CHA type aluminum-silicon molecular sieve and a preparation method and application of an SCR catalyst, and belongs to the field of chemical synthesis technology and application thereof. The CHA type aluminosilicate zeolite molecular sieve is synthesized by adopting an N,N,N-trialkylbicyclo[2.2.2]octylammonium compound as an organic template agent, wherein the molar ratiorange of silicon dioxide to aluminum oxide in the product is 6-80, the average grain diameter is less than or equal to 500 nm, the total specific surface area is more than or equal to 400m2/g, the total pore volume is more than or equal to 0.20 ml/g, the micropore volume is not less than 0.10 ml/g, and the grain diameter in the crystal face (-210) direction of the molecular sieve is 50-160 nm. After hydrothermal treatment of the molecular sieve at 600-800 DEG C, the tetra-coordinated aluminum accounts for more than or equal to 90% of the total aluminum amount, and the hexa-coordinated aluminumaccounts for less than or equal to 10% of the total aluminum amount. The molecular sieve provided by the invention has high hydrothermal stability without large crystal grains, shows high nitrogen oxide reduction characteristics, and especially shows a catalyst with high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The invention discloses a CHA type chabazite molecular sieve and a synthesis method and application thereof, and belongs to the field of chemical synthesis technology and application thereof. The CHAtype chabazite molecular sieve is synthesized from N, N, N-trialkyl-N-phenyl quaternary ammonium salt or quaternary ammonium base compound as an organic template agent. The molar ratio of silicon dioxide to aluminum oxide of the CHA type chabazite molecular sieve ranges from 5 to 80, wherein the average grain diameter is less than or equal to 500 nm. The BET method determines that the total specific surface area is greater than or equal to 400 m <2>/g, the total pore volume is greater than or equal to 0.20 ml/g, the micropore pore volume is greater than or equal to 0.10 ml/g, and the grain diameter in the crystal face (-210) direction is 50-160 nm. The molecular sieve provided by the invention has high hydrothermal stability under the condition of no large crystal grains, and shows high nitrogen oxide reduction characteristics after being exposed at high temperature and high humidity, especially shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The invention discloses a CHA type molecular sieve synthesized by using a quaternary ammonium onium template agent containing double cyclic groups, a catalyst, a preparation method and an applicationof the catalyst, and belongs to the field of chemical synthesis technologies and application thereof. The CHA type zeolite molecular sieve is synthesized by forming a composite organic template agentfrom a quaternary ammonium onium compound containing double cyclic groups and alkyl substituted quaternary ammonium base. The molar ratio range of the product silicon dioxide relative to aluminum oxide is 5-80, the average grain diameter is smaller than or equal to 500 nm, the total specific surface area is larger than or equal to 400 m <2>/g, the total pore volume is larger than or equal to 0.20ml/g, the micropore pore volume is larger than or equal to 0.10 ml/g, snd the grain diameter in the crystal face (-210) direction is 50-160nm. The molecular sieve provided by the invention has high hydrothermal stability under the condition of no large grain diameter, shows high nitrogen oxide reduction characteristics after high-temperature and high-humidity exposure, and especially shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The invention discloses a simplified multi-pulse rectifier based on a double-switch power electronic phase-shifting transformer, and belongs to the technical field of power electronics. The simplifiedmulti-pulse rectifier solves the problem that an existing isolation type phase-shifting transformer is large in size/weight, meanwhile, the pulse number of the rectifier is multiplied in a simple mode, input current harmonic waves are effectively restrained, and continuous adjustment of the output voltage of the rectifier is achieved. The simplified multi-pulse rectifier comprises a first group of rectifier bridges with clamping circuits, a second group of rectifier bridges with clamping circuits, a phase-shifting transformer, a first group of three-phase rectifier bridges, a second group ofthree-phase rectifier bridges, a balance reactor with a secondary winding, a single-phase rectification circuit, a post-stage filter circuit and a control circuit, wherein a turn ratio of a primary side winding to the secondary side winding of the balance reactor with the secondary side winding is 0.246, and at the moment, the balance reactor with the secondary side winding and the single-phase rectification circuit form a pulse multiplication balance reactor which is used for realizing the pulse number multiplication of the rectifier. The simplified multi-pulse rectifier is mainly used for converting three-phase alternating current into direct current.

The invention discloses a CHA structure molecular sieve and a preparation method and application of a tail gas denitration catalyst of the CHA structure molecular sieve, and belongs to the field of chemical synthesis technology and application thereof. An N,N,N-trialkyl-(norcamphane-2-yl)-quaternary ammonium onium compound is used as an organic template agent to synthesize the CHA structure molecular sieve, the molar ratio of silicon dioxide to aluminum oxide ranges from 6 to 80, the average grain diameter is smaller than or equal to 500 nm, the total specific surface area is larger than or equal to 400 m2/g, the total pore volume is larger than or equal to 0.20 ml/g, the micropore volume is larger than or equal to 0.10 ml/g, and the grain diameter size in the crystal face (-210) directionis 50-160 nm. After the molecular sieve is subjected to hydro-thermal treatment at 600-850 DEG C, the tetra-coordinated aluminum accounts for more than or equal to 90% of the total aluminum amount, and the hexa-coordinated aluminum accounts for less than or equal to 10% of the total aluminum amount. The molecular sieve provided by the invention has high hydrothermal stability without large crystal grains, shows high nitrogen oxide reduction characteristics after being exposed at high temperature and high humidity, and especially shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The invention discloses a preparation method of a multi-grain-scale lamellar structure aluminum alloy. The preparation method comprises the steps of pretreatment, casting, plastic deformation, multi-grain scale formation and the like, two or more kinds of aluminum alloys with different alloy components are selected, solid-liquid embedding casting is carried out, and the multi-layer composite aluminum alloy is formed. Plastic deformation and subsequent annealing treatment are performed to form phases with different grain sizes between adjacent layers to obtain the multi-grain-scale reinforced lamellar structure aluminum alloy material.

The invention discloses a CHA molecular sieve synthesized by a novel structure template agent and an SCR catalyst and application thereof, and belongs to the field of chemical synthesis technology andapplication thereof. The CHA molecular sieve is synthesized by adopting one or more of N,N,N-trialkyl-(indan-5-yl)quaternary ammonium onium, N,N,N-trialkyl-(indan-1-yl)quaternary ammonium onium or N,N,N-trialkyl-(indan-4-yl)quaternary ammonium onium compounds as an organic template agent, wherein the molar ratio range of silicon dioxide to aluminum oxide is 6-80, the average grain diameter is less than or equal to 500nm, the total specific surface area is greater than or equal to 400m2/g, the total pore volume is greater than or equal to 0.20 ml/g. the micropore volume is greater than or equal to 0.10 ml/g, and the grain diameter size in the crystal face (210) direction is 50-160 nm. The molecular sieve provided by the invention has high hydrothermal stability under the condition of no large crystal grains, also shows high nitrogen oxide reduction characteristics after high-temperature and high-humidity exposure, and especially shows a catalyst with high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The application relates to the field of materials science, and in particular to a preparation method of a precious metal compound and an application thereof. The preparation method of the precious metal compound includes the following steps of: providing a substrate, and depositing a precious metal film on the surface of the substrate to form a first intermediate product with a flat surface; and performing a selenization reaction or a tellurization reaction on the surface of the first intermediate product to form a precious metal compound. The structural formula of the precious metal compoundis AB or AB2, wherein A is one or more of gold, silver, platinum, ruthenium, rhodium, palladium, osmium or iridium, and B is a selenium element or a tellurium element. The precious metal compound prepared by the method can break away from the limitations of substrate materials in the preparation of the precious metal compound in the prior art. That is, the method can prepare the precious metal compound on any substrate material. In addition, the method can produce a large-sized precious metal compound, and the size of the precious metal compound can meet the needs of industrial applications.

The invention discloses an AEI/AFX topological structure symbiotic composite molecular sieve and a preparation method of an SCR catalyst, the AEI/AFX topological structure symbiotic composite molecular sieve is formed by symbiosis of AEI and AFX topological structure molecular sieves, and a characteristic diffraction peak exists at a 2 theta angle in an X-ray diffraction phase spectrogram of the molecular sieve with a symbiotic composite structure; wherein the molar ratio of silicon to aluminum oxide in the symbiotic composite molecular sieve is 10-200. In the preparation process of the symbiotic composite molecular sieve, a composite template agent is adopted; an FAU type silicon-aluminum molecular sieve is used as an aluminum source and a silicon source, other silicon sources and alkalisources can be combined to form mixed sol, an AEI/AFX symbiotic structure molecular sieve is synthesized through dynamic crystallization according to temperature sections, and then the AEI/AFX symbiotic structure molecular sieve exchanges with soluble metal salt cations to obtain the SCR molecular sieve catalyst. The SSZ-39 with the AEI structure and the SSZ-16 with the AFX structure form the symbiotic composite molecular sieve; the composite molecular sieve has more reasonably distributed acidity and good hydrothermal stability, has good catalytic activity and excellent service life in SCR reaction of NOx-containing gas discharged by a moving source and a fixed source, and can well meet the standard requirements of tail gas emission.

The invention discloses a nitrogen oxide purification CHA zeolite molecular sieve as well as a preparation method and application of a catalyst thereof, and belongs to the field of chemical synthesistechnologies and application thereof. The CHA zeolite molecular sieve is synthesized by adopting an N,N,N-trialkyl-quinuclidine-4-quaternary ammonium onium compound as an organic template agent, the molar ratio range of silicon dioxide to aluminum oxide is 6-80, the average grain diameter is less than or equal to 500 nm, the total specific surface area is more than or equal to 400m2/g, the total pore volume is more than or equal to 0.20 ml/g, the micropore volume is more than or equal to 0.10 ml/g, and the grain diameter in the crystal face (-210) direction of the molecular sieve is 50-160 nm.After hydrothermal treatment of the molecular sieve at 600-800 DEG C, the tetra-coordinated aluminum accounts for more than or equal to 90% of the total aluminum amount, and the hexa-coordinated aluminum accounts for less than or equal to 10% of the total aluminum amount. The molecular sieve provided by the invention has high hydrothermal stability without large crystal grains, shows high nitrogen oxide reduction characteristics after being exposed at high temperature and high humidity, and especially shows a catalyst with high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The invention relates to a chopped carbon fiber toughened silicon carbide composite material and a preparation method thereof. The preparation method comprises the following steps of: reacting chopped carbon fibers with a silane coupling agent, absolute ethyl alcohol and deionized water to obtain coupling agent grafted chopped carbon fibers; mixing the coupling agent grafted chopped carbon fibers with an organic solution of a high-carbon-residual-rate binder to obtain high-carbon-residual-rate binder coated chopped carbon fibers; mixing the high-carbon-residual-rate binder coated chopped carbon fibers with silicon carbide powder to obtain mixed powder; performing dry pressing on the mixed powder to obtain a biscuit, and performing degreasing treatment to obtain a preform; and carrying out reactive infiltration on the preform to obtain the chopped carbon fiber toughened silicon carbide composite material.

The invention discloses a CHA structure molecular sieve and a synthesis method thereof, and a nitrogen oxide selective reduction catalyst and application thereof, and belongs to the field of chemicalsynthesis technology and application thereof. An N,N,N-trialkyl-(naphthyl-1-yl)quaternary ammonium onium compound is adopted as an organic template agent to synthesize the CHA structure molecular sieve, the molar ratio range of silicon dioxide to aluminum oxide is 6-80, the average grain diameter is smaller than or equal to 500 nm, the total specific surface area is larger than or equal to 400 m2/g, the total pore volume is larger than or equal to 0.20 ml/g, the micropore volume is larger than or equal to 0.10 ml/g, and the grain diameter in the crystal face (-210) direction of the molecular sieve is 50-160 nm. The molecular sieve provided by the invention has high hydrothermal stability under the condition of no large crystal grains, and shows high nitrogen oxide reduction characteristicsafter being exposed at high temperature and high humidity, especially shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

The invention relates to a glucose dehydrogenase mutant with chemical tolerance and application thereof in coenzyme regeneration, and belongs to the technical field of bioengineering. The invention provides a bacillus megatherium glucose dehydrogenase mutant, a coding gene thereof, a recombinant expression vector containing a sequence of the gene, a recombinant expression transformant, a preparation method of a mutant enzyme preparation, and practical application of the mutant enzyme preparation in participating in regeneration of coenzyme NAD (P) H in oxidation-reduction reaction. According to the invention, the mutant with significantly improved thermal stability and chemical tolerance is obtained, and the requirements of industrial application are met. The mutant disclosed by the invention not only has high activity and thermal stability, but also has good chemical tolerance, is more beneficial to coenzyme regeneration in a biological catalytic reaction system containing a high-concentration organic cosolvent or a high-concentration substrate/product, and shows a wider application prospect in industrial application.

The invention relates to a preparation method of an industrial pure aluminum wire. The preparation method of the industrial pure aluminum wire comprises a three-step process of melt purification treatment, hot extrusion treatment and rotary forging treatment, and particularly the low temperature rotary forging treatment process is used after the melt purification treatment and the hot extrusion treatment. According to the preparation method of the industrial pure aluminum wire, by constructing fine elongated grains in materials, the radial size of the fine elongated grains is small and beneficial to the improvement of the strength of the materials, the axial size greatly increases the electron transport distance, the scattering effect of the grain boundary on an electron is reduced, the conductivity of the materials is improved, the mechanical properties are further improved, so that a conductive aluminum alloy with high dimensional accuracy, good surface finish and excellent conductivity and strength is obtained.

The invention belongs to the field of material preparation, and particularly relates to a preparation method of a multi-crystal-granule-size multi-layer high-entropy alloy. The preparation method of the multi-crystal-granule-size multi-layer high-entropy alloy comprises the following steps of (1) pretreating: selecting more than two high-entropy alloys, wherein each high-entropy alloy is a single phase and cannot happen phase change in the heating process, and each high-entropy alloy at least contains one FCC and BCC-structure single phase; (2) casting: carrying out solid-liquid inlaying and casting on the liquid-state high-entropy alloy and the solid-state high-entropy alloy, and forming a multi-layer high-entropy alloy; (3) rolling: cutting the multi-layer high-entropy alloy to obtain a multi-layer high-entropy alloy block, and rolling to obtain a rolling-state multi-layer high-entropy alloy; and (4) forming a multi-crystal-granule-size: carrying out heat treatment on the rolling-state multi-layer high-entropy alloy, and obtaining the multi-crystal-granule-size multi-layer high-entropy alloy. The preparation method of the multi-crystal-granule-size multi-layer high-entropy alloy provided by the invention adopts a multi-alloy solid-liquid mixed casting and forming method, the prepared high-entropy alloy has toughness and strength of a soft phase and a hard phase to a certain degree, and the high-strength high-toughness double-system or multi-system refined crystalline strengthening high-entropy alloy with a favorable combination property is obtained.

The invention discloses a cotton impurity detection system and method based on machine vision, and belongs to the technical field of cotton impurity image detection. And a machine vision and deep learning technology is utilized, a cotton miscellaneous data set is adopted to train a convolutional neural network, then a weight is output, an optimized convolutional neural network is obtained, and image information of actually detected noil is identified. The convolutional neural network has a complementary search technology and a searchable lightweight and efficient network architecture, has the characteristics of low parameter, high performance and high speed, and can meet the requirements of industrial application. On the basis, the parameter layer and the channel number can be adjusted, the parameter quantity is reduced, and the detection speed is improved, so that the method is more suitable for impurity image detection and classification. The method is high in automation degree, a previous manual sorting mode is replaced, the efficiency is improved, and the cost is reduced. Meanwhile, the cotton impurity detection efficiency and quality are improved, more technical supports are provided for subsequent impurity removal, the finished product quality of cotton textiles is improved, and the method has good application prospects.

The invention belongs to the field of material preparation, and particularly relates to a multi-extrusion device for preparing a layered isomeric magnesium alloy and a method for preparing the layeredisomeric magnesium alloy by utilizing the device A plurality of as-cast magnesium alloy ingot blanks subjected to homogenization treatment are cut into square shapes and subjected to preheating treatment, then the square-shaped as-cast magnesium alloy ingot blanks are put into a mold, the blanks are pressed into a cavity under the acting force applied by a punch, and the punch is extruded to continuously move downwards to push the alloy blanks to continuously enter the cavity. After the cavity is completely filled with a blank, an extrusion insert is taken out, an insert with a larger extrusion ratio is replaced, and a limiting block at the outlet part of the blank is adjusted upwards, so that the magnesium alloy which is forced to be extruded obtains enough space, and the extrusion experiment is repeated. In addition, the insert is replaced with the insert with the larger extrusion ratio, the position of the limiting block is adjusted upwards again, and then the extrusion experimentis repeated again. Through repeating the processes, the layered isomeric magnesium alloy with excellent comprehensive performance, high strength and high toughness is finally obtained.