1695 results about "Acetylene" patented technology

The invention relates to the field of lithium battery negative electrode materials, and particularly discloses a silicon-carbon composite negative electrode material for a lithium ion battery and a preparation method of the silicon-carbon composite negative electrode material. The method comprises the following steps: preparing a porous carbon substrate, and depositing silicon nanoparticles in pores and on the surface of the porous carbon substrate by adopting a fluidized bed chemical vapor deposition process and taking silane as a silicon source to obtain a silicon-carbon core material; continuously carrying out carbon coating on the surface of the silicon-carbon core material in the fluidized bed by taking acetylene as a carbon source to form a carbon coating layer; and leading out the obtained material from the fluidized bed, taking acetylene as a carbon source, and carrying out carbon coating on the surface of the primary carbon coating layer again by adopting the rotary furnace to form a secondary carbon coating layer. According to the preparation method, a porous carbon matrix and double-layer functional carbon coating process is adopted, so that the volume expansion of silicon in the circulation process is remarkably inhibited, the interface side reaction is reduced, and the circulation stability of the material is effectively improved.

The invention discloses a preparation method and application of a conjugated microporous polymer microsphere filler with a hollow structure, silicon dioxide nanospheres are placed in an organic solvent, after uniform ultrasonic dispersion, 1, 3, 5-triacetylene benzene and 2, 6-dibromo-3-aminopyridine are added, after a catalyst is added, a stirring reaction is carried out in a nitrogen atmosphere to obtain yellow powder, and the yellow powder is dried to obtain the conjugated microporous polymer microsphere filler with the hollow structure. Etching with hydrofluoric acid, cleaning the treated product until the filtrate is transparent and colorless, and drying in vacuum to obtain the conjugated microporous polymer microsphere filler with the hollow structure. Nanoscale holes are formed in the hollow-structure conjugated microporous polymer microsphere filler, so that the hollow-structure conjugated microporous polymer microsphere filler has good heat insulation performance and good heat stability at high temperature, and can be used as a heat-resistant performance enhancing filler.

The invention discloses a coal gasification slag-based backfill material for replacing flow-state solidified soil, a preparation method and an application, utilizes a synergistic gelling effect among three raw materials, breaks through a material strength forming mechanism of traditional flow-state solidified soil, solves the problems of multiple components and high cost of a flow-state solidified soil material in the prior art, and has the advantages of low raw material cost, low raw material cost, low raw material cost, low raw material cost and the like. And the product popularization is facilitated. The specific scheme is as follows: the coal gasification slag-based backfill material for replacing the fluidized stabilized soil comprises coal gasification slag, carbide slag and titanium gypsum, the ratio of the coal gasification slag to the carbide slag to the titanium gypsum is 6-8: 1.5-3.5: 0.5-1.5, and an alkaline activator is also added; the coal gasification slag is a slag block with a set particle size formed after slag at the bottom of a gasification furnace is cooled, the carbide slag is waste slag which takes calcium oxide as a main component after acetylene gas is obtained by hydrolyzing calcium carbide, and under the action of an exciting agent, the coal gasification slag and the carbide slag are fully activated to release polyhedrons; part of the polyhedrons form a gelling product so as to improve the early strength of the coal gasification slag-based backfill material.

The invention is applicable to the technical field of nano material preparation, and provides a preparation method of a two-dimensional acetylene-rich carbon / molybdenum sulfide heterostructure hydrogen production catalyst, which comprises the following steps: adding molybdenum sulfide into a solution to prepare a suspension A; adding soluble cuprous salt into the turbid liquid A in an inert atmosphere to obtain a mixed liquid B; alkynyl benzene is added into an organic solvent, and a mixed solution C is obtained; dropwise adding the mixed solution C into the mixed solution B under a continuous stirring condition, and reacting to obtain a mixed solution D; centrifuging the mixed solution D to obtain a precursor E; and cleaning the precursor E, and carrying out vacuum drying to obtain the two-dimensional acetylene-enriched carbon / molybdenum sulfide heterostructure hydrogen production catalyst. No additive is needed in the preparation process, and the product purity is high; by constructing a special two-dimensional heterostructure, the problem of molybdenum sulfide is solved, and the intrinsic activity and stability of the material are remarkably improved. The preparation method has the advantages of easily available raw materials, simple process, low cost and environmental protection, and is suitable for industrial production.

The invention relates to the technical field of lithium ion batteries, in particular to a carbon source mixed gas CVD coated silicon-carbon negative electrode material, a preparation method and a lithium ion battery. The preparation method comprises the following steps: 1) preparation of a silicon-carbon material: placing porous carbon in equipment, regulating and controlling the gas speed and the dynamic rotation speed of the equipment to uniformly disperse the porous carbon, heating to 380-650 DEG C, and introducing silane mixed gas with the concentration of 5-50% to form the silicon-carbon material; and 2) coating the silicon-carbon material with mixed gas carbon: introducing mixed gas sources with different proportions into equipment, regulating and controlling the gas speed and the dynamic rotation speed of the equipment to uniformly disperse the mixed gas sources, and heating to 450-700 DEG C to realize uniform carbon coating on the surface of the silicon-carbon material. According to the invention, the problem of explosion caused by self-polymerization reaction of single acetylene is solved; and moreover, the uniform carbon coating isolates the side reaction problem caused by direct contact between the electrolyte and the nano silicon, and the stability of the silicon-carbon material is improved.

A liquid crystal element includes two substrates with a transparent conductive film, the substrates being arranged such that transparent conductive films face each other, and a liquid crystal-polymer composite film which is sandwiched between the two substrates with a transparent conductive film, in which the liquid crystal-polymer composite film contains an acetylene alcohol.

The invention provides a metal doped silicon carbon negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: a modified amorphous carbon material and a metal silane precursor are respectively prepared, the particle size of the modified amorphous carbon material is 7-8 [mu] m, and the internal pore size of the modified amorphous carbon material is 0.1-10 nm; the modified amorphous carbon material is placed in a chemical vapor deposition reactor, nitrogen is introduced, the temperature is increased to 500-700 DEG C, then composite gas is introduced, the deposition reaction is carried out for 100-800 minutes, a pre-product is obtained, the composite gas comprises a metal silane precursor, doping auxiliary gas and acetylene gas, and the doping auxiliary gas is used for regulating and controlling growth of sediments; and heating the pre-product to 750-850 DEG C for 10-30 minutes, cooling the pre-product to 500-600 DEG C, introducing acetylene gas again, and keeping the temperature for 30-300 minutes to obtain the metal-doped silicon-carbon negative electrode material. Therefore, the electrochemical performance and the cycle life are effectively improved.

The invention relates to the field of new energy battery buffer parts, in particular to an anti-static foaming silica gel buffer part for a new energy battery and a preparation method of the anti-static foaming silica gel buffer part. The anti-static foaming silica gel buffer part is prepared by mixing and foaming anti-static mixed rubber, a foaming agent, hydrogen-containing silicone oil, an inhibitor and a platinum catalyst, the anti-static rubber compound is prepared from the following raw materials in percentage by weight: 37-50% of methyl vinyl silicone rubber raw rubber, 38-45% of white carbon black, 8-15% of anti-static filler and 1-3% of hydroxyl silicone oil; the antistatic filler is composed of an antistatic agent and a silane-containing active agent; the antistatic agent is composed of acetylene carbon black and a single-walled carbon nanotube. Under the action of the silane-containing active agent, the acetylene carbon black and the single-walled carbon nanotubes are interwoven to form a stable supporting antistatic skeleton structure, so that static electricity can be effectively conducted, static electricity accumulation is avoided, the structure is kept stable in long-term use, and the compression resilience and antistatic durability of the buffer part are ensured.

The invention discloses a system for preparing acetylene by partial oxidation of natural gas, which comprises a natural gas preheating furnace, an oxygen preheating furnace and an acetylene furnace, both the natural gas preheating furnace and the oxygen preheating furnace are communicated with the acetylene furnace, the acetylene furnace is communicated with a quenching water inlet pipe, and a pyrolysis gas outlet of the acetylene furnace is directly connected with a YT membrane dust remover. According to the scheme, the problems that in the prior art, a carbon black water system is large in carbon black removal difficulty and high in carbon black post-treatment cost, VOCs and carbon black floating influence the environment when carbon black is removed through an open-type carbon black water tank, waste heat of the system is difficult to utilize, and wet carbon black adheres to the inner wall of a pyrolysis gas pipeline and blocks the pipeline are solved.

This invention relates to a method for using a low-content ruthenium-based catalyst modified with nitrogen and oxygen ligands in the hydrochlorination of acetylene. The invention utilizes 2-pyridine carboxylate as a ligand, commercial activated carbon as a support, trace amounts of ruthenium as the main active component, and water as a solvent. An improved synthesis procedure yields a low-content ruthenium-based catalyst with ruthenium ions coordinated by a modifier and commercial activated carbon as a support, significantly improving catalyst performance while reducing ruthenium content. This catalyst exhibits high activity and vinyl chloride selectivity in the fixed-bed hydrochlorination of acetylene to vinyl chloride, and its low cost makes it highly valuable for industrial applications. The ruthenium loading is 0.1%, and the reaction gas space velocity is 170 h⁻¹. ‑1 V (C2H2) / V (HCl) With a ratio of 1:1.05 and a reaction temperature of 180℃, the acetylene conversion rate can reach 84.3%, the vinyl chloride selectivity is greater than 99%, and the activity remains basically unchanged within 10 hours.

The invention discloses a preparation method of an all-solid-state lithium-sulfur battery composite positive electrode, which comprises the following steps: weighing raw materials of sodium thiosulfate, hydrochloric acid and a conductive agent (such as one or more of graphene, carbon nanotubes, conductive carbon black and acetylene black) according to a certain proportion, stirring, precipitating, washing and drying to obtain a sulfur-carbon precursor; and performing mechanical ball milling on the precursor and an electrolyte according to a certain proportion, and grinding with a binder to obtain a composite positive electrode, and taking the composite positive electrode as the positive electrode of the all-solid-state lithium-sulfur battery. According to the invention, the problem of non-uniform lithium ion transmission caused by large particle size of active substance sulfur is solved, so that the utilization rate of the active substance is improved; meanwhile, the problem of non-uniform dispersion of the active substance sulfur and the conductive agent carbon is solved, so that the cycle stability of the battery is improved; in addition, the addition of the binder enhances the contact of each component in the composite positive electrode, thereby obtaining more excellent electrochemical performance.

The invention relates to the field of lithium battery negative electrode materials, and particularly discloses a high-energy silicon-carbon composite negative electrode material for a lithium ion battery and a preparation process of the high-energy silicon-carbon composite negative electrode material. The preparation method comprises the following steps: mixing resin-based activated carbon and biomass activated carbon with specific pore volume and compressive strength according to a mass ratio of 1: (0.2-0.3) to obtain a porous carbon matrix; depositing silicon nanoparticles on the porous carbon substrate by adopting a fluidized bed chemical vapor deposition process; depositing a thin carbon layer on the surface of the silicon-carbon core material by taking acetylene as a carbon source; and carrying out secondary carbon coating by adopting a rotary furnace to form the silicon-carbon negative electrode material. According to the composite negative electrode material prepared by the process, the resin-based activated carbon is used as a main matrix, so that the influence of more impurities and non-uniform pore structure distribution of biomass activated carbon on the cycling stability and conductivity of the silicon-carbon negative electrode material is reduced, and the problems of volume expansion and conductivity of the silicon-based negative electrode material are solved.

The invention discloses a transformer fault detection method and device, a transformer and a storage medium. The transformer fault detection method comprises the following steps: acquiring hydrogen gas concentration, methane gas concentration, ethylene gas concentration, ethane gas concentration and acetylene gas concentration of dissolved gas in transformer oil, and determining a target transformer fault area corresponding to the dissolved gas according to the acetylene gas concentration; and determining a decision coordinate value corresponding to the dissolved gas according to the hydrogen gas concentration, the methane gas concentration, the ethylene gas concentration, the ethane gas concentration and the acetylene gas concentration, and determining a current transformer fault of the transformer according to the decision coordinate value and the target transformer fault area. According to the method, the dissolved gas in the transformer oil is effectively identified and quantified, the method is suitable for low-cost online fault detection of the transformer, and the accuracy of fault detection and identification of the transformer is improved.

The invention provides a preparation method for preparing a diamond-like carbon protective film on the surface of glass, the diamond-like carbon protective film and the glass.The preparation method for preparing the diamond-like carbon protective film on the surface of the glass comprises the steps that mixed gas of silane, acetylene and argon with the flow ratio being 10: 5: 1-20: 10: 1 is introduced into a reaction chamber; the pressure intensity in the reaction chamber is adjusted to 0.1-10 Pa; the power of a pulse ionization power supply is set to be 100-2000 W; the plasma auxiliary voltage is set to be 10-1000 V; and depositing the diamond-like carbon protective film with Si-H functional groups on the surface of the glass under the conditions that the deposition temperature is 50-200 DEG C and the deposition time is 10-120 minutes. By applying the technical scheme provided by the invention, the problems of poor hydrophobicity and light transmission of glass in the prior art can be effectively solved.

The invention discloses a metal organic framework material as well as a preparation method and application thereof, and belongs to the technical field of chemical separation. The preparation method of the metal organic framework material provided by the invention comprises the following steps: taking water and methanol as solvents, taking 4, 4 '-dipyridyl and malic acid as organic ligands, adding a zinc source, reacting, and in the reaction process, connecting oxygen atoms on the malic acid with zinc ion bonds on the zinc source to form a 2D layered network structure, the two-dimensional layered network structures are bridged through 4, 4 '-dipyridyl to form a 3D rigid network framework, and after the reaction is finished, the metal organic framework material is prepared. The metal organic framework prepared by the invention has a superstrong capture effect and a large storage space on acetylene molecules, and also has an excellent separation effect on an acetylene and carbon dioxide mixed system, so that the aim of purifying acetylene in the acetylene and carbon dioxide mixture at high purity and high yield is achieved.

The invention discloses an in-situ real-time non-intrusive acetylene content monitoring gas relay and device in the technical field of transformers of power transmission and transformation equipment, two inspection windows are symmetrically arranged on the gas relay along the flowing direction of oil flow, each inspection window adopts a circular three-layer composite structure, and each inspection window adopts a three-layer composite structure. The middle layer is a light-transmitting magnetic fluid cavity filled with magnetic fluid, a Halbach permanent magnet array ring is bonded outside the inspection window, an electromagnetic coil is arranged on the outer side of the ring, and the device comprises a light source unit, a photoacoustic detection unit and a magnetic fluid control device. The problem that acetylene gas cannot be detected in situ in real time in the prior art is solved by additionally arranging a light beam analyzer and a smudginess sensor, and the beneficial effects of improving the monitoring accuracy and real-time performance and enhancing the fault early warning capability are achieved.

The invention belongs to the technical field of carbon nanomaterials, and particularly relates to a highly graphitized carbon tube grid of a scaffold-like structure and a preparation method and application of the highly graphitized carbon tube grid. The preparation method comprises the following steps: taking aluminum oxide with interconnected pore channels inside as a template, and obtaining a three-dimensional interconnected nickel nanorod grid film through an electro-deposition method; by utilizing the catalytic graphitization property of metal nickel and regulating and controlling parameters of acetylene when the acetylene is decomposed on the surface of the metal nickel, the problem that three-dimensional highly-graphitized carbon with controllable morphology and size cannot be synthesized due to nickel deformation caused by a catalytic mechanism is solved, and the highly-graphitized carbon tube grid with a scaffold-like structure is obtained; and the crystallinity of the carbon tube grid film is effectively improved at a relatively low temperature. The preparation process is simple, feasible and environment-friendly, and equipment is low in cost and common. A smooth ion transport channel provided by the vertical carbon tube array and a rapid electron conduction network provided by the highly graphitized interconnected carbon tube structure are expected to be used in the fields of alternating current filtering, high power output and the like.

The utility model discloses a scorched particle crushing device for an acetylene carbon black production process, and relates to the technical field of acetylene carbon black production, the scorched particle crushing device comprises a device main body and an acetylene carbon black scorched particle crushing mechanism, the acetylene carbon black scorched particle crushing mechanism is arranged above the device main body, and the acetylene carbon black scorched particle crushing mechanism is arranged above the device main body. Acetylene carbon black is put into a smashing tank, then a servo motor is started to drive a driving rod to rotate, acetylene carbon black coke particles in the smashing tank are smashed through a smashing cutter set, the smashed filter screen can filter the acetylene carbon black through the filter screen, and meanwhile a filtering and stirring rod rotates together to stir the acetylene carbon black on the filter screen; the acetylene carbon black coke particles are prevented from being adhered to the filter screen, the acetylene carbon black filtering effect is ensured, the pressurizing water pump is started to pump water in the water tank into the crushing tank while the acetylene carbon black coke particles are crushed, then the interior is humidified to a certain degree through the atomizing spray head, a wet crushing environment is formed, and dust is effectively inhibited when the acetylene carbon black is crushed.

The embodiment of the invention provides a power transformer oil paper insulation discharge fault detection device, which comprises a characteristic parameter acquisition unit and a calculation unit, and is characterized in that the characteristic parameter acquisition unit is used for acquiring target electric energy data and oil sample dissolved gas component data of an oil product in a target transformer; the electric energy data and oil sample dissolved gas component data are transmitted to a calculation unit, and the oil sample dissolved gas component data comprise component data of hydrogen, acetylene, total hydrocarbon, carbon monoxide and carbon dioxide; the calculation unit is used for importing the target electric energy data and the oil sample dissolved gas component data into a trained fault recognition model to generate a fault type result, and the fault recognition model is obtained by training a preset power transformer oil paper insulation discharge fault experiment system. According to the embodiment of the invention, the reliability and real-time performance of fault diagnosis are remarkably improved, the health state of the power transformer can be monitored in time, and early warning and processing can be carried out in time.

The invention relates to an acetylene purification system and method, in particular to a method for removing impurities in acetylene to an electronic-grade acetylene level through a membrane separation technology coupled rectification process, and belongs to the field of gas separation. Aiming at the characteristics of an industrial grade acetylene material, the invention provides a technology for preparing electronic grade acetylene based on membrane separation coupling rectification, the membrane separation technology and the rectification technology are organically coupled, and a safe solvent is introduced into a rectification tower, so that the thermal stability of liquid acetylene is effectively improved, and the explosion risk is remarkably reduced. According to the technology, efficient preparation of the electronic-grade acetylene (the purity is greater than or equal to 99.9999%) is realized, and the method has a good industrial application prospect and popularization value.

The present invention provides a method for preparing an organostannane compound catalyzed by diethylzinc, belonging to the technical field of preparing stannane compounds. The method can solve the problems urgently needed to be solved in the preparation method of such stannane compounds. The method comprises: mixing an acetylene compound, a tin hydrogen compound, and a diethylzinc catalyst under an inert atmosphere; reacting the reaction system at 60 to 70°C for 18 to 24 hours, then exposing the reaction system to air to terminate the reaction, and purifying the organostannane compound by column chromatography, wherein the inert atmosphere is nitrogen. The stannane compound is a vinyl stannane compound or an ethynyl stannane compound, and the acetylene compound is an aliphatic acetylene compound or an aromatic acetylene compound. The present invention solves the problems urgently needed to be solved in the preparation method of such organostannane compounds, such as the high cost of the catalyst used, the environmentally unfriendly nature of the catalyst, and the complex operation process.

The invention relates to the technical field of electrode materials, in particular to a CuO-coated PVDF electrode material and a preparation method and application thereof.The preparation method comprises the following steps that a waste solar photovoltaic back plate is smashed and hydrolyzed under the alkaline condition, a polyethylene glycol terephthalate layer on the surface of the photovoltaic back plate reacts with alkali to generate ethylene glycol and terephthalic acid salt, and then a CuO-coated PVDF electrode material is obtained; pVDF in the photovoltaic backboard is separated in a precipitation form, and PVDF is prepared; the preparation method comprises the following steps: dissolving a cupric salt and a cationic surfactant in water, carrying out a co-precipitation reaction at room temperature in an alkaline environment to generate a nano Cu (OH) 2 precipitate, and drying and decomposing to obtain a CuO precursor; cuO, PVDF, acetylene black and an organic solvent are mixed and stirred, in the stirring process, the surface of CuO is coated with PVDF in situ, acetylene black is evenly distributed, and the CuO-coated PVDF electrode material with CuO nanoparticles as an inner core, PVDF as a shell and acetylene black evenly distributed is formed.

The invention provides a metal element doped zinc-aluminum spinel catalyst as well as a preparation method and application thereof. Lattice sites on the surface of the zinc-aluminum spinel are accurately anchored by metal elements in a monatomic form, a lattice atom substitution or gap doping strategy is realized, and the technical problem of preparation of the metal element doped zinc-aluminum spinel in the prior art is mainly solved. The preparation method of the metal element doped zinc-aluminum spinel comprises the following steps: dissolving a zinc source, an aluminum source, a metal M (Ni / Cu / Pt / Pd) precursor and a precipitator in water, stirring and mixing, carrying out hydrothermal treatment, separating solids, filtering, drying, and calcining to obtain the metal element doped zinc-aluminum spinel catalyst (M-ZnAl2O4). Wherein the nickel metal element is doped with the zinc-aluminum spinel catalyst, so that larger nickel particles are more favorably formed, the particle size distribution is uniform, and the catalytic activity and the stability are greatly improved in the reaction of preparing ethylene through acetylene hydrogenation; the copper-nickel metal element doped zinc-aluminum spinel catalyst also shows good catalytic activity and stability in a methanol reforming hydrogen production reaction.

To provide a method for producing a triazole skeleton-containing polymer having a desired substituent, and to provide the triazole skeleton-containing polymer.SOLUTION: The present invention provides a method for producing a triazole-skeleton-containing polymer, the method including a step of reacting an acetylene group contained in a starting material polymer with an azide group-containing compound to obtain the triazole-skeleton-containing polymer, the starting material polymer being a polymer containing a first monomer unit 1A derived from a monomer having the acetylene group and a second monomer unit derived from a second monomer, the triazole-skeleton-containing polymer having a triazole-skeleton-containing monomer unit and the second monomer unit.SELECTED DRAWING: None

The invention relates to the technical field of special cables, and discloses a high and low temperature resistant composite insulating layer cable and a preparation method thereof.The cable comprises a conductor core and a composite insulating layer wrapping the conductor core, and the composite insulating layer comprises a high temperature resistant heat conduction core layer and a low temperature resistant elastic layer; the high-temperature-resistant heat-conducting core layer is prepared from the following raw material: polyamide acid; hexagonal boron nitride; alpha-phase silicon carbide; the preparation method comprises the following steps: adding gamma-amino propyl triethoxy silane; nano barium titanate; the low-temperature-resistant elastic layer is prepared from the following raw materials: vinyl terminated polydimethylsiloxane; performing hydrophobic treatment on fumed silica; a Karstedt catalyst; a hydrogen-containing silicone oil crosslinking agent; the average particle size D50 of the 1-ethynyl-1-cyclohexanol and the alpha-phase silicon carbide is 0.5 to 2 mu m. According to the invention, by adopting a microwave selective heating and interlayer heat conduction mechanism, efficient and high-quality integrated curing of the composite insulating layer is realized.

The invention relates to the technical field of transition metal catalysts, in particular to a transition metal / alkali metal bimetallic monatomic catalyst for catalyzing acetylene hydrochlorination reaction and a preparation method and application of the transition metal / alkali metal bimetallic monatomic catalyst. After dipping in an alkali metal nitrate solution, the alkali metal is firstly converted into a metal oxide through two-stage calcination, and then the metal oxide is converted into a super-strong alkali metal monatomic material containing a high defect site. And dipping the alkali metal monatomic catalyst in a transition metal salt solution to obtain the transition metal / alkali metal bimetallic monatomic catalyst. Transition metal monatomic serves as a main active center, alkali metal monatomic serves as a super alkali auxiliary, the microenvironment of active sites is greatly improved, the adsorption capacity of the transition metal sites to reactants is enhanced, meanwhile, carbon deposition side reaction can be inhibited, and synergistic catalysis between transition metal and alkali metal monatomic is achieved; the catalyst shows high catalytic activity and stability on acetylene hydrochlorination reaction.

The invention is suitable for the technical field of water electrolysis hydrogen production, and provides an alkyne-rich carbon-ruthenium nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: simultaneously adding a ruthenium salt solution, a nickel salt solution and an organic molecule solution into an alkyne-enriched carbon dispersion liquid for reaction; and carrying out centrifugation, cleaning and vacuum drying treatment on the reacted mixed solution to obtain the alkyne-rich carbon-ruthenium nickel alloy catalyst. According to the invention, the acetylene-rich carbon-ruthenium nickel alloy catalyst uniformly loaded with ruthenium nickel (RuNi) clusters is successfully prepared. In the performance evaluation of hydrogen production by water electrolysis in a simulated seawater environment, the material shows excellent hydrogen evolution activity as a cathode catalyst. Experimental results show that under the applied potential of-0.6 V (relative to a reversible hydrogen electrode, RHE), the absolute value of the current density can reach 0.847 A cm <-2 > to 0.896 A cm <-2 >. The invention provides a feasible material solution for developing a high-performance water electrolysis hydrogen production catalyst suitable for a complex water quality environment.

The invention discloses a preparation method of a hydrophobic modified copper-based monatomic catalyst. The preparation method comprises the following steps: S1, dissolving Cu (NO3) 2 and L-alanine in deionized water; dissolving trimesic acid in an ethanol solution; s2, mixing the two solutions, and stirring at regular time at normal temperature to obtain a Cu-BTC precursor; s3, grinding and uniformly mixing the Cu-BTC precursor and dicyandiamide, and then putting the mixture into a tubular furnace for high-temperature pyrolysis treatment to obtain Cu-N-C-Pre powder; s4, the Cu-N-C-Pre powder is subjected to acid leaching impurity removal treatment in an acid solution, and the copper-based monatomic catalyst is obtained; and S5, dissolving the Cu-N-C catalyst and triacetylene benzene in an organic solvent, adding pyridine, uniformly stirring, and carrying out a hydrothermal reaction to obtain the hydrophobic modified copper-based monatomic catalyst. Hydrophobic modification is performed on the surface of the Cu-N-C monatomic catalyst, so that the hydrophobicity of the surface of the catalyst is enhanced, the catalytic activity of the catalyst in a reaction for preparing phenol by activating a benzene C-H bond by taking H2O2 as an oxidizing agent is improved, and the yield of phenol is increased.

The embodiment of the invention provides an acetylene filling pipeline straight pipe butt joint positioning tool and a using method thereof, and relates to the technical field of pipeline butt joint. The acetylene filling pipeline straight pipe butt joint positioning tool comprises a lifting mechanism, a transmission mechanism and a checking mechanism. The transmission mechanism is connected with the lifting mechanism and used for driving the lifting mechanism to do linear motion, two first clamping mechanisms are arranged on the lifting mechanism, and the two first clamping mechanisms are used for clamping a first straight pipe; the device further comprises two fixing seats, second clamping mechanisms are arranged on the two fixing seats, a second straight pipe is clamped on the two second clamping mechanisms, and the proofreading mechanism is arranged between the first straight pipe and the second straight pipe. The acetylene filling pipeline straight pipe butt joint positioning tool does not need to carry extra detection instruments, operation is more convenient and faster, butt joint precision and efficiency are improved, and the problems that in the prior art, manual detection errors are large, and operation is complex are effectively solved.

The utility model relates to the technical field of coal bunker fire monitoring, and discloses a coal bunker fire monitoring and early warning system, which comprises a steel pipe fixed on the wall body of a coal bunker in a penetrating manner; one end of the monitoring pipe is open, the other end of the monitoring pipe is closed, and the closed end is detachably connected with one end, in the coal bunker, of the steel pipe; the circuit board is arranged in the monitoring pipe, and a gas sensor is integrated on the circuit board. According to the coal bunker fire monitoring and early warning system, content changes of gases such as carbon monoxide, carbon dioxide, oxygen, methane, acetylene and ethylene in a coal bunker can be monitored through the gas sensors on the circuit board, data are transmitted to the upper computer outside the coal bunker, and the upper computer monitors the gas content and sends the monitored data to the coal bunker. According to the method, the coal piling area which is rapidly heated in the coal bunker can be found more accurately and timely in the early stage, and then the timeliness and accuracy of fire monitoring are improved.