50results about How to "Facilitate desorption" patented technology

The invention relates to the technical field of catalysts for gas purification, in particular to a hierarchical pore metal-based catalytic adsorbent as well as a preparation method and application thereof. The invention discloses an integrated preparation method combining a sol-gel method and a template method, which comprises the following steps of: adding a template agent before forming gel, adding a proper amount of ammonia water in an aging process, accurately controlling other reaction conditions and a raw material ratio, and controlling a spatial confinement effect of the template method and a chemical reaction in a sol-gel process to obtain a sol-gel composite material. The morphology and size of the catalytic adsorbent can be accurately regulated and controlled, the hierarchical pore metal-based catalytic adsorbent with a microporous structure as a main material and mesopores and macropores as coexistence is finally prepared, the hierarchical pore structure provides rich adsorption sites and catalytic activity centers, and the hierarchical pore metal-based catalytic adsorbent has high adsorption capacity, high selectivity, good catalytic activity, good stability and easy regeneration.

The invention provides a preparation method and application of magnesium L-threonate, and belongs to the technical field of medicines. The preparation method comprises the following steps: dissolving L-ascorbic acid in water, adding magnesium hydroxide and alkaline magnesium carbonate, stirring, dropwise adding hydrogen peroxide, heating, stirring and reacting, filtering a product, purifying and concentrating by temperature-sensitive molecularly imprinted hydrogel while the product is hot, adding an ethanol water solution into a concentrated solution, standing, crystallizing, filtering, washing and drying to obtain the magnesium L-threonate. And cooling the temperature-sensitive molecularly imprinted hydrogel after adsorption to room temperature, washing and repeatedly using the temperature-sensitive molecularly imprinted hydrogel. The magnesium L-threonate is simple in preparation method, high in purity and high in yield, meanwhile, the slow-release magnesium L-threonate is prepared, and the magnesium L-threonate is low in toxicity, good in biocompatibility, large in drug loading capacity, low in economic cost and good in drug effect and has wide application prospects in preparation of anti-depression drugs.

The invention discloses a method for increasing the yield of coal seam gas through cooperation of water jet slotting and hot flue gas displacement, which comprises the following steps: firstly, drilling in a low-permeability coal seam to form a slotting gas injection drill hole and an extraction drill hole, and performing high-pressure hydraulic slotting on the slotting gas injection drill hole to form an annular slotting groove; then a gas injection pipe and an extraction pipe are arranged in the slotted gas injection drill hole and the extraction drill hole correspondingly, and hole sealing operation is completed; the method comprises the following steps: firstly, extracting free gas in the slotted gas injection drill hole, then injecting hot flue gas into the slotted gas injection drill hole, and promoting desorption and flow of gas in coal body hole fractures by utilizing high temperature property and displacement property of the hot flue gas to form a new gas migration channel. And finally, the desorbed gas is subjected to secondary extraction in the extraction drill hole. Water jet slotting and hot flue gas displacement are combined, the breathability of the coal seam is preliminarily improved through high-pressure water jet by means of hydraulic slotting, generation of new pores is promoted through hot flue gas injection, gas is driven to flow out, a large amount of CO2 is sealed in the coal seam, and the gas extraction efficiency of the coal seam difficult to extract is improved.

The invention provides an acoustic compatibilization material, a preparation method thereof, a loudspeaker module and electronic equipment. The acoustic compatibilization material comprises a living carrier and a porous material, the living carrier has a pore structure, and the pore structure comprises mesopores and macropores; the porous material is loaded or embedded in the pore structure of the living carrier; the porous material is provided with # imgabs0 two-dimensional pore channels and / or three-dimensional pore channels, and the pore channels are communicated with one another. The invention also provides a preparation method of the acoustic compatibilization material, which comprises the following steps: immersing the living carrier in a solution of a porous material precursor, and crystallizing to obtain the acoustic compatibilization material, the preparation method does not comprise a roasting step. The invention further provides a loudspeaker module which comprises the acoustic compatibilization material. The invention further provides an electronic device. The electronic device comprises the loudspeaker module. The acoustic compatibilization material provided by the invention has a hierarchical pore structure, has a relatively good acoustic compatibilization effect, and can effectively improve the low-frequency effect of a loudspeaker.

The invention provides a preparation method of a gradient porous material loaded noble metal catalyst. The method comprises the following steps: preparing hydroxyapatite powder; the preparation method comprises the following steps: taking hydroxyapatite powder, adding absolute ethyl alcohol, performing ultrasonic dispersion to prepare a suspension, adding polyvinyl butyral, and stirring with a magnetic stirrer to uniformly disperse the polyvinyl butyral to form hydroxyapatite slurry; taking three kinds of Pt catalyst loaded polylactic acid / glycolic acid copolymer microspheres with different particle sizes, and laying the microspheres in a mold according to the particle sizes; pouring the hydroxyapatite slurry into a mold, applying a certain pressure to fill gaps of microspheres with the hydroxyapatite slurry, and completely drying; and sintering in a sintering furnace to obtain the gradient porous material loaded noble metal catalyst. According to the invention, the noble metal catalyst is loaded on the gradient porous material, and the gradient aperture structure can promote the reactants to be guided by the capillary tube and quickly transfer the mass to each active site, so that the rate and efficiency of the selective hydrogenation performance are improved.

The invention discloses a method for synthesizing a biomass-based carbon material by coupling activation through a molten salt method, which comprises the following steps: (1) crushing a biomass raw material into powder, and pre-carbonizing at high temperature in an inert atmosphere to obtain biochar; (2) mixing biochar, chlorate molten salt and an activating agent, and calcining at high temperature in an inert atmosphere to obtain a carbon material; and (3) washing the obtained carbon material with water, carrying out suction filtration after water washing, then carrying out acid washing, carrying out suction filtration after acid washing, then carrying out water washing until eluate is neutral, and then drying to obtain the biomass-based carbon material. The invention also discloses an application of the carbon material prepared by the method in preparation of a supercapacitor. The biomass-based capacitor carbon material prepared by the invention has a graded porous structure, micropores are beneficial to improving the surface adsorption capacity of ions, mesopores can provide more active sites and enhance the ionic conductivity, and macropores can provide a rapid substance transmission channel and reduce the mass transfer resistance; through an electrochemical performance test, when the material is used as a supercapacitor electrode material, the material has excellent capacity and cycling stability.

The invention relates to a method for repairing polycyclic aromatic hydrocarbon contaminated soil, which comprises the following specific steps: S1, eluting the polycyclic aromatic hydrocarbon contaminated soil by using a surfactant to obtain eluted soil; s2, modifying the biochar by adopting a modification solution to obtain modified biochar; and S3, the modified charcoal obtained in the step S2, MoS2 and monopersulfate are mixed and put into the eluted soil obtained in the step S1, and remediation of the polycyclic aromatic hydrocarbon contaminated soil is completed. Compared with the prior art, when the surface active agent, the biochar and the MoS2 technology are comprehensively applied to remediation of the polycyclic aromatic hydrocarbon contaminated soil, the surface active agent is firstly used for enhancing the solubility and the bioavailability of the PAHs; then, the modified biochar is combined with a MoS2 or PMS system to form a composite remediation system, and the removal efficiency and the remediation effect of polycyclic aromatic hydrocarbons (PAHs) can be improved.

The application discloses a titanium nitride supported osmium platinum catalyst with a gradient polarization effect, a preparation method of the catalyst and application of the catalyst in fuel cells, and belongs to the field of new energy materials and electrocatalysis technology. The catalyst comprises a TiN carrier and a Pt-Os alloy cluster supported on the carrier, wherein Os is doped in the form of a single atom in a Pt nanocluster. A gradient polarization architecture is constructed inside the catalyst, electrons are directionally transferred in TiN-Pt-Os, and electron-rich Os single atoms act as oxygenophilic sites to capture OH ‑ , adjacent Pt sites dissociate H2, through two-site cooperation and interface water network regulation, significantly accelerating the kinetics of alkaline hydrogen oxidation reaction. The mass activity of the catalyst reaches 11337 A / g, which is 24.7 times that of commercial Pt / C; when applied to an AEMFC single cell, the peak power density reaches 1.49 W / cm 2 , which is 2.7 times that of commercial Pt / C, and has excellent practical application prospect.

The invention provides a preparation method of a hydrogenation catalyst and a method for preparing trimethyl hydroxyethyl propane diamine by using the catalyst. A carrier of the catalyst is a bimetallic oxide carrier, active components of the catalyst are Pd and Ni, and auxiliaries are selected from chromium, manganese, lithium, tin, iron and cerium. The catalyst can be used for preparing trimethyl hydroxyethyl propane diamine by taking N, N-dimethylaminopropionitrile, N-methylethanolamine and hydrogen as raw materials, and is high in activity, high in selectivity, stable in performance and long in service life. In addition, a new reaction route is adopted, ethylene oxide is not used, the risk of the process can be reduced, in addition, raw materials are cheap and easy to obtain, reaction conditions are mild, the product yield is high, the production cost is low, economical efficiency is good, and good industrial application prospects are achieved.

The application belongs to the field of chemical catalysis technology, and specifically discloses application of a rare earth metal doped modified white clay mesoporous composite material as an ethanol dehydrogenation catalyst carrier. The preparation method of the rare earth metal doped modified white clay mesoporous composite material comprises the following steps: after alkali modification of active white clay powder, the active white clay powder is dispersed in silica sol, an aqueous solution of a rare earth metal salt is added dropwise, and then hydrothermal crystallization treatment and calcination treatment are performed to obtain the rare earth metal doped modified white clay mesoporous composite material. The modified white clay-mesoporous silica composite substrate is selected, and the rare earth metal is chemically bonded to the interface of the composite substrate to form an inlaid cross-linked multi-level pore network, thereby breaking through the limitation of a conventional porous carrier that relies on physical adsorption to load active metals. The prepared ethanol dehydrogenation catalyst reduces carbon deposition by virtue of the rare earth interface modification, greatly delays the rapid deactivation rate of the catalyst, significantly enhances the operation stability of the catalyst and prolongs the service life, and meets the needs of industrial continuous production.

The present application relates to the field of ammonia decomposition catalyst preparation, discloses a supported nickel-based catalyst, a preparation method and application thereof, and a method for hydrogen production by ammonia decomposition.A supported nickel-based catalyst, the catalyst containing a barium titanate carrier and a nickel element supported on the barium titanate carrier; the content of nickel is 2-15 wt% based on the total weight of the catalyst in terms of nickel oxide; wherein the average particle size of the catalyst is 1-10 microns.The catalyst has high activity, and when applied to hydrogen production by ammonia decomposition, it has high ammonia decomposition conversion rate at low temperature and large space velocity.

The invention belongs to the technical field of catalysts, and particularly relates to a composite carrier dehydrogenation catalyst for preparing gamma-butyrolactone through dehydrogenation of 1, 4-butanediol as well as a preparation method and application of the composite carrier dehydrogenation catalyst. According to the composite carrier dehydrogenation catalyst disclosed by the invention, a Y-type molecular sieve / gamma-Al2O3 is used as a composite carrier, and an active component copper oxide is loaded on the composite carrier; wherein the mass ratio of the Y-type molecular sieve to the gamma-Al2O3 is (1-2): 1, the copper element content is 10%-20% according to the weight ratio of the composite carrier, and the zinc element content is 6%-10% according to the weight ratio of the composite carrier. By adopting a composite carrier structure, the dispersity and stability of active metals Cu and Zn are effectively enhanced. The composite carrier dehydrogenation catalyst prepared by the preparation method provided by the invention has the advantages of high catalytic activity, high selectivity and high stability.

The invention relates to the technical field of preparation of methanol through hydrogenation, in particular to a preparation method and application of a hydrophobic supported catalyst, and the preparation method comprises the following steps: S1, preparing a mesoporous gamma-Al2O3 carrier by adopting an evaporation-induced self-assembly method; s2, carrying out hydrophobic modification on the gamma-Al2O3 carrier by adopting a method of heating in a water bath kettle at a constant temperature and a low temperature and adopting silane reagents such as dimethyl diethoxy silane, propyl trimethoxy silane, octyl trimethoxy silane and the like; s3, loading Cu and ZnO by adopting a wet impregnation method or an easy impregnation-capture method; the surface property of the gamma-Al2O3 material is improved through hydrophobic modification of a methyl group, and the catalyst prepared by the method has higher hydrophobicity and has higher methanol selectivity and reaction stability compared with an unmodified catalyst in the reaction of synthesizing methanol through co-hydrogenation of carbon monoxide and carbon dioxide.

This invention discloses a method for methane extraction and closed-loop carbon fixation in coal seams using hot flue gas-driven combustion-explosion fracturing. First, each horizontal branch well is divided into sections, and perforations are constructed in each section. Then, CH4 is used in each section. 4 Combustion-explosive fracturing technology utilizes in-situ synergistic combustion-explosion reactions to generate gas impact perforation fractures, allowing them to further develop and expand into a fracture network. Then, hot flue gas is sequentially injected into each horizontal branch well. Due to its high temperature, the hot flue gas promotes CH4 (chemical oxygen demand) in the coal seam. 4 Gas desorption, and CO in hot flue gas 2 SO 2 NO 2 Due to its competitive adsorption advantage, it can displace a large amount of CH4 adsorbed in extra-thick coal seams. 4 Gas, then hot flue gas and CH 4 The gas continues to be utilized in a closed loop, improving the efficiency of coal seam methane extraction while simultaneously achieving hot flue gas sequestration. Through this continuous closed-loop utilization process, the efficiency of methane combustion and fracturing, hot flue gas sequestration, and CH4 extraction in various areas of extra-thick coal seams is maximized. 4 Extraction efficiency.

The application belongs to the technical field of ship exhaust purification, and particularly relates to a catalyst for decomposing N2O in the exhaust of a ship ammonia internal combustion engine and a preparation method thereof. 3+ By replacing Co ions in the Co3O4 spinel lattice into the lattice, the doping behavior can effectively reduce the number of hydroxyl groups on the surface of the catalyst, significantly weaken the adsorption and combination ability of water molecules, and thus improve the stability of the catalyst in a high-humidity exhaust environment. As an additive, CeO2 uses its oxygen storage capacity to promote the migration and desorption of oxygen species in the reaction, preventing the deactivation of active sites due to oxygen poisoning. The molecular sieve carrier not only provides a highly dispersed surface for the active component to prevent sintering, but also optimizes the adsorption and activation path of N2O and alleviates the poisoning effect of nitrogen-containing intermediate species or impurities in the exhaust on the Co active center during the reaction.

The invention relates to a copper-indium-silver catalyst, a preparation method thereof and a method for preparing synthesis gas with an adjustable ratio of carbon monoxide to hydrogen through electrocatalysis of carbon dioxide. The preparation method comprises the following steps: dispersing a multi-walled carbon nanotube in water to obtain a dispersion liquid A; dispersing copper nitrate trihydrate, indium nitrate hydrate and silver nitrate in water to obtain dispersion liquid B; mixing the dispersion liquid A and the dispersion liquid B to obtain dispersion liquid C; adding alkali into the dispersion liquid C to obtain a mixed solution D; and filtering and drying the mixed solution to obtain the copper-indium-silver electrocatalyst. The invention also provides the copper-indium-silver catalyst prepared by the method and a method for preparing synthesis gas with an adjustable ratio of carbon monoxide to hydrogen by electrocatalysis of carbon dioxide. According to the copper-indium-silver electrocatalyst provided by the invention, an electron-rich Cu site is formed by utilizing the synergistic effect of three metals, CO2 adsorption and CO desorption are promoted, and HER is inhibited, so that CO2RR and HER are balanced, and the selectivity of carbon monoxide synthesis gas is effectively improved.

The invention relates to the technical field of catalytic oxidation, and discloses a method for catalytic oxidation of carbon monoxide. The invention relates to a carbon monoxide catalytic oxidation method, which comprises: in the presence of a catalytic oxidation catalyst, carrying out a catalytic oxidation reaction on a carbon monoxide-containing reaction raw material and oxygen, the catalytic oxidation catalyst comprises an amino and propyl modified carrier, and the carrier is a manganese oxide and / or a copper-manganese composite oxide. The method can improve the conversion rate and long-period operation stability of carbon monoxide.

The application belongs to the technical field of solid oxide fuel cell anode catalyst, and particularly relates to a preparation of a multi-doped layered perovskite anode and application thereof in ammonia solid oxide fuel cells. x Ba 1–x Mn 1–y TM y O 3–δ (0.4<=x<=0.6, 0<=y<=0.3, TM=Co, Fe, Cu), the precursor is phase changed under a reducing atmosphere to form a PrBaMn2O 5+δ layered perovskite with rich oxygen vacancies, and the doped transition metal is precipitated in the form of an alloy and anchored on the surface of the layered perovskite. The anode catalyst has a simple synthesis method, low cost, rich and flexible adjustable element composition. The obtained anode catalyst is made into a slurry and then assembled into a solid oxide fuel cell single cell sheet. The solid oxide fuel cell prepared by the application has good power output, electrical conductivity and stability at medium and high temperatures.

This invention provides a method for preparing an amphiphilic Janus nanoflotation agent and its application in foam flotation to remove perfluorinated compounds (PFOCs) from water, relating to the technical field of PFOC removal in water. The method for preparing the amphiphilic Janus nanoflotation agent involves grafting hydrophobic and hydrophilic functional groups onto the surface of an SNP (spatial nucleus polymer) to achieve an amphiphilic Janus structure. The introduction of long C-F chains and amino groups respectively yields the hydrophobic and hydrophilic amphiphilic structures, enabling the flotation agent to irreversibly adsorb at the gas-liquid interface and thus exert a highly efficient foam-stabilizing effect. The amphiphilic Janus nanoflotation agent provided by this invention not only generates stable foam during foam flotation but also effectively captures PFCs, thereby achieving the removal of PFOS and PFOA.

The invention relates to the technical field of composite electroplating, in particular to an electroplating method for preparing a high-wear-resistance self-lubricating plating layer, which comprises the following steps: firstly, carrying out pretreatment of oil removal and acid pickling activation on a metal workpiece; then preparing a nano composite nickel plating solution in which a nickel plating basic solution contains a nano particle composite phase subjected to pre-dispersion treatment, and the total concentration of composite particles is 10-60g / L; then the dispersion stability of the nano-composite nickel plating solution is maintained in a circulating filtration and mechanical stirring combined mode, and the pretreated workpiece is electroplated; and finally, after electroplating is completed, the workpiece is cleaned and dried. According to the electroplating process for preparing the nickel-based composite coating with high wear resistance and low friction coefficient, the pulse current is adopted, and the high instantaneous current density and turn-off time of the pulse current are utilized, so that desorption and rearrangement of adsorbed particles are facilitated, uniform embedding of the particles is promoted, nickel matrix crystal grains are refined, and the compactness and comprehensive mechanical properties of the coating are further optimized.

The invention discloses an industrial robot vision sensor measuring device, which belongs to the field of industrial robot detection, and comprises a plurality of vision measuring units mounted on the outer wall of the moving end of a manipulator, the vision measurement unit comprises a support fixedly connected to the outer wall of the moving end of the manipulator, a second buffer pad fixedly connected to one side of the support, a box fixedly connected to the upper end of the second buffer pad, a vision sensor fixedly connected to the inner wall of the box, an opening formed in one side of the box, a clamping groove formed in the inner wall of the opening and transparent glass located in the clamping groove. The visual sensor is separated from an industrial environment through the box body and the transparent glass, a lens of the visual sensor is prevented from being polluted by dust, oil stains and welding sparks in the working process of the manipulator, meanwhile, attachments attached to the surface of the glass can be regularly removed through airflow and vibration, and the visual sensor can be cleaned in some environments with liquid splashing or oil mist. Greasy dirt, water drops or condensate water are prevented from gathering on the glass surface, and the glass surface is kept clean.

This invention belongs to the field of detection technology, specifically relating to a method for detecting the heavy metal content in food additives. The detection method includes the following steps: (1) sample pretreatment; (2) preparing a series of heavy metal standard solutions of different concentrations, testing their net strength using an ICP-MS instrument, and obtaining a standard working curve; (3) testing the net strength of the sample solution and blank solution using an ICP-MS instrument, and obtaining the concentration of heavy metals in the food additives by combining the standard working curves, and further obtaining the content of heavy metals in the food additives. The detection method of this invention can be used to detect the heavy metal arsenic in compound meat product thickeners. Through enzymatic hydrolysis-assisted extraction and ultrasonic synergistic extraction, gradient ultrasound combined with temperature control is used to further destroy the sample structure and improve the arsenic dissolution efficiency; EDTA and citric acid are used to complex metal ions, and multiple components synergistically reduce the fixation effect of other ions on arsenic. Through synergistic effect, the accuracy of the detection results is improved.

The present application relates to a kind of underground gasification system of gas-containing coal seam and its gasification method, including multiple groups of vertical and interval arrangement U-shaped pipeline, the U-shaped opening of U-shaped pipeline is all upwards, and the bottom of U-shaped pipeline is gasification passage, and multiple through holes are formed screen pipe in gasification passage;First switch valve is arranged and installed in the opening of both ends of U-shaped pipeline, and the same end portion between adjacent two groups of U-shaped pipeline is also all connected by the connecting pipe with second switch valve, the communication position of connecting pipe and U-shaped pipeline is all below first switch valve, and detection tube is communicated on each connecting pipe, both ends of detection tube are communicated with connecting pipe, and the communication position of both ends of detection tube and connecting pipe is on the side of second switch valve, gas composition detection device, gas temperature detection device, exhaust pipe and third switch valve are also sequentially installed on detection tube, fourth switch valve is installed on exhaust pipe, and the present application can realize the efficient underground gasification operation of gas-containing coal seam.

This invention belongs to the field of automotive interior material testing technology and discloses a VOC release detection device for automotive interior materials. The device includes: a rotating support frame; a detection chamber assembly rotatably mounted on the rotating support frame, the detection chamber assembly including a main housing and a sealing cover mechanism, which cooperate to form a sealed detection chamber; and a suspension clamping assembly disposed within the detection chamber for clamping the sheet-like test material and physically dividing the detection chamber into a first chamber and a second chamber. This invention constructs a breathing circulation system through an oil-free pump suction mechanism combined with a bellows buffer mechanism, driving gas to reciprocate through the test material. Combined with a rotating inverted structure, gravity is used to accumulate the excitation medium on the material surface. Under the action of alternating airflow, cyclic excitation of fluidized suspension and compaction contact is generated, thereby effectively destroying the gas boundary layer under microscopic hammering and friction, significantly improving the deep VOC desorption rate and detection accuracy.

A method for strengthening methane in-situ combustion fracturing, liquid carbon dioxide is pressurized and heated to form supercritical carbon dioxide, which is then sent into the fracturing channel to form a complex fracture network around the fracturing channel; mixed fracturing fluid formed by mixing supercritical carbon dioxide and fly ash is injected into the well bottom; combustion-supporting agent is injected into the wellbore and mixed with the mixed fracturing fluid at the well bottom to enter the complex fracture network together, so that a multiphase mixed fluid is formed in the complex fracture network; the annulus valve is closed to promote mineralization reaction of supercritical carbon dioxide and fly ash under the temperature and pressure conditions of the reservoir, and to form high-strength minerals; the mineralization reaction is used to promote the desorption of methane in the reservoir and into the complex fracture network, so that methane-combustion-supporting agent mixed gas is formed in the complex fracture network; the combustion process is used to promote the dust cloud formed by the mixing of fly ash and gas in the complex fracture network, to strengthen the effect of methane in-situ combustion; and the fracturing reconstruction of all layers is completed. The fracturing effect of the method is ideal.

The application discloses a preparation method of a dehydrogenation catalyst carrier. Pseudo-boehmite, esculin gum and alkali metal salt are mixed and then added into water to form a suspension, an acid solution is used to perform sol treatment on the suspension to obtain a sol solution, a gelling agent is added into the sol solution and then placed on a dispersion drop head above an oil column to perform oil column molding, and after aging, washing with water, drying and roasting, alumina small balls are obtained; wherein the pseudo-boehmite is composed of pseudo-boehmite A and pseudo-boehmite B with a mass ratio of 1: (0.1-10), the pore volume of the pseudo-boehmite A is 0.1-0.3 mL / g, and the pore volume of the pseudo-boehmite B is 1.0-2.0 mL / g. Meanwhile, the application also discloses application of the dehydrogenation catalyst carrier in a dehydrogenation catalyst and dehydrogenation application of the dehydrogenation catalyst. The prepared carrier makes the service life of the dehydrogenation catalyst better and the catalyst activity better.

The invention relates to the technical field of MOFs materials, in particular to a modified metal organic framework material and a preparation method and application thereof. The modified metal organic framework material comprises: a metal center; and at least two organic ligands coordinated to the at least two binding sites of the metal center to form an at least partially crystalline network structure having a plurality of internal pores; wherein the modified metal organic framework material crystal is provided with a wrinkled outer surface, and the contact angle between the modified metal organic framework material and water is 40-120 degrees. The modified metal organic framework material is used for catalytically preparing an N-substituted pyrrole compound (such as a 2, 5-dimethyl-N-substituted pyrrole compound) and has the outstanding characteristics of high reaction efficiency, high product yield and the like.

The application discloses a closed-loop extraction and isotope tracing method for hot flue gas displacement of coal bed methane, which comprises the following steps: first, using CH4 combustion and explosion fracturing technology to form a crack network in the in-situ coal seam by synergistic combustion and explosion reaction impact fracturing; then, injecting hot flue gas into the combustion and explosion fractured coal seam; the hot flue gas can promote the desorption of CH4 gas in the coal body due to its high temperature; the CO2, SO2 and NO2 in the hot flue gas can replace a large amount of CH4 gas adsorbed in the in-situ coal seam due to the competitive adsorption advantage; the extracted CH4 and hot flue gas can be continuously used in a closed loop; the hot flue gas storage is realized, and the coal bed methane extraction efficiency is improved; in addition, the combustion and explosion gas and the hot flue gas are marked by specific isotopes, and the migration characteristics and interaction of the combustion and explosion gas, the hot flue gas and the extracted CH4 gas in the target deep coal seam can be analyzed and reversed; therefore, the injection parameters of the combustion and explosion gas and the hot flue gas can be dynamically regulated and controlled, and the hot flue gas storage and CH4 extraction efficiency of the deep in-situ coal seam are maximized.

The application discloses a coal seam permeability enhancement system and method based on zeolite-assisted carbon dioxide intensification cavitation, and relates to the technical field of gas extraction. The method first segments and blocks the drilling hole through a packer, and under the premise of hydraulic fracturing, combines high-speed rotation of an impeller, heating and temperature rise, and cooperation of zeolite powder porous gas release foaming and carbon dioxide medium, breaks the micro-pore structure of the coal body by means of high-energy shock waves generated by bubble collapse, breaks the fracturing water lock effect and penetrates the coal seam fracture network, and greatly improves the overall permeability of the coal seam. Secondly, after injecting high-pressure carbon dioxide gas into the coal rock mass, the free gas and water in the pore and fracture are gradually displaced by the pressure pushing, adsorption displacement and seepage migration effect. The technical problems of limited improvement of coal seam permeability, low concentration of extracted gas methane, and inhibition of gas desorption by water lock effect after hydraulic fracturing are solved.