101 results about "Oxygen adsorption" patented technology

The invention discloses application of a carbon nitride photocatalyst based on multiple asymmetric active sites in hydrogen peroxide production. A sulfur-doped carbon nitride nanotube is synthesized through a thermal polymerization method, and then the photocatalytic material S-CNT-Zn with zinc monatomic loaded on the sulfur-doped carbon nitride nanotube is synthesized through an impregnation-calcination method. The preparation process is simple, and the preparation flow is simple. The carbon nitride photocatalyst with multiple asymmetric active sites can break the symmetry of a carbon nitride material, form gradient charge distribution, realize multi-path charge transfer and promote migration and separation of carriers. And the zinc monatomic as an oxygen adsorption site can promote the adsorption of oxygen and reduce the formation energy barrier of the intermediate. When visible light drives oxygen reduction to synthesize hydrogen peroxide, the carbon nitride photocatalyst with multiple asymmetric active sites keeps the stability of the catalyst and higher hydrogen peroxide yield, so that clean, stable and efficient photocatalytic reduction of oxygen to synthesize hydrogen peroxide is realized.

The invention relates to application of a molybdenum-based electrocatalyst cathode in electrocatalytic degradation of antibiotics in wastewater. According to the cathode, foamed nickel serves as a substrate, and carbon-doped oxygen vacancy-enriched molybdenum oxide C-MoO2-X is loaded on the surface of the substrate. The preparation method of the electrocatalyst is simple to operate, low in cost and environment-friendly, and the NF net structure with excellent performance can effectively avoid MoO2 agglomeration in the calcination process. According to the preparation method, pressure stress is generated by utilizing lattice shrinkage after carbon doping, adjacent O atoms are forced to be separated from lattices, stable oxygen vacancies are formed in MoO2 lattices through electron reconstruction, electron transfer is enhanced, strong Mo-C bonds are formed, Mo atoms are stabilized, oxidation dissolution of the Mo atoms is inhibited, the oxygen adsorption behavior is optimized, and an activation energy barrier from O2 to H2O2 to O2 is reduced. According to the invention, by designing a carbon-doped pyrolysis process, the selective generation of O2 of more than 90% is realized. The research provides a new design scheme for preparing an efficient and cheap non-noble metal ORR catalyst.

The invention discloses an active oxygen electrode material for water purification and disinfection and a preparation method and application thereof, and belongs to the technical field of drinking water purification. The electrode material is based on Ox-CNHs nano conductive particles obtained from treated single-walled carbon nanohorns, is matched with nitrogen-doped polyaniline and other components, and is prepared by innovatively using aniline and coal gasification fine slag through a special process. Due to the unique structure, the oxygen adsorbability is good, the electric conductivity is good, active oxygen groups can be efficiently generated, the water body and air disinfecting and purifying capacity is achieved, repeated use can be achieved, the cost is reduced, and high-value utilization of solid waste is achieved. The electrode material is used for a cathode and an anode of an electrochemical water purification and disinfection device, and by virtue of excellent conductivity and catalytic activity, the cathode and the anode cooperate with a runner plate to guide a water body to flow in an electrochemical reactor, so that the water body is in full contact with the electrode, and the purification and disinfection efficiency on the water body is remarkably improved; the method has wide prospects in the fields of water and air disinfection and purification and environmental protection.

The invention relates to the field of fabric preparation, in particular to a cold-proof and oxygen-resistant fabric applied to extreme working conditions and a preparation method of the cold-proof and oxygen-resistant fabric. The fabric is formed by compounding a honeycomb base body outer layer, a middle buffer layer and a functional inner layer. The outer layer is hexagonal honeycomb grid base cloth formed by weaving basalt filaments and PTFE modified polyimide core-spun yarns, and composite colloid is injected for stepped curing; the middle layer is formed by sewing a silicon dioxide aerogel felt subjected to electrostatic spraying of paraffin microcapsules and a flame-retardant pre-oxidized fiber felt; and the inner layer is an oxygen adsorption layer formed by activating polyimide / flame-retardant viscose blended yarns and then grafting the activated polyimide / flame-retardant viscose blended yarns with a ZIF-8 material. All the layers are separated through polybenzimidazole membranes, and the composite fabric with excellent cold resistance, flame retardance, oxygen resistance and structural stability is finally obtained through gradient hot pressing, water-cooling shaping and surface flame-retardant coating treatment and is suitable for protective equipment in an extreme environment.

The present application provides a kind of biomass gasification coupling SOEC co-electrolysis system and process of green fuel, the present application is coupled with biomass gasification and solid oxide electrolytic cell (SOEC) co-electrolysis synthesis gas path, with forestry waste biomass as raw material, adopt oxygen-carrying-CO2 adsorption functional material, construct gasification-adsorption integrated and SOEC co-electrolysis deep coupling system;System includes gasification unit, first heat exchange unit, gas purification unit, regeneration oxidation unit, SOEC electrolysis unit and fuel synthesis unit;With wind power, photovoltaic and other green electricity as SOEC electrolysis unit driving energy, integration biomass directional conversion, CO2 in situ capture-function material regeneration cycle, SOEC high temperature co-electrolysis is integrated, rely on heat cascade utilization, achieve system material closed loop reuse;By adjusting the amount of water vapor in the system, obtain specific hydrogen carbon ratio synthesis gas, so as to realize the production of green fuel, whole process saves traditional water gas shift process, improve system energy efficiency, avoid carbon loss, reduce high temperature energy consumption.

The invention discloses an opencast coal mine coal spontaneous combustion incubation period prediction method suitable for a negative temperature condition, and relates to the technical field of coal spontaneous combustion prediction. The method comprises the following steps: firstly, carrying out an oxygen adsorption dynamic experiment on a to-be-detected coal sample at a constant temperature of-20 to 100 DEG C to obtain a low-temperature oxygen adsorption rate constant and establishing a function relationship between the low-temperature oxygen adsorption rate constant and the temperature; secondly, calculating ice melting latent heat according to the ice content in the coal sample to be detected, and introducing the ice melting latent heat as a key energy loss item into the heat-mass transfer model of the coal pile; further, establishing a coal pile energy balance equation comprehensively considering oxidation heat release, ice melting latent heat consumption and a heat dissipation process; and finally, solving the equation through a numerical method, and calculating the time required by the coal pile from the initial negative temperature rise to the critical spontaneous combustion temperature so as to obtain the accurate coal spontaneous combustion latency. The method is particularly suitable for mines in cold regions, surface mines and winter coal storage yards.

The present invention provides a bionic structure ceramic catalyst, and the bionic structure ceramic catalyst includes "mesophyll", "vein" and "epidermis" structures; the "mesophyll" is the main structure, which is composed of one of perovskite structure, double perovskite structure or Ruddlesden-Popper structure; the "vein" is a network structure located inside the "mesophyll", the "epidermis" is a coating layer located on the surface of the "mesophyll", and the "vein" and "epidermis" are cubic fluorite structure or perovskite structure. The "epidermis" structure located on the surface of the "mesophyll" has abundant oxygen vacancies, which is beneficial to the processes of oxygen adsorption, dissociation and entering the lattice during the oxygen catalysis process. The network-like "vein" structure located inside the "mesophyll" provides a fast channel for the conduction of oxygen ions, making the catalyst have excellent oxygen ion conduction ability.

The present invention relates to a purification device system and method for oxygen, nitrogen and crude neon and helium gases. Based on non-cryogenic gas purification technology, the dehydrogenation of crude neon and helium gases is coupled with the regeneration of nitrogen deoxygenation adsorbent, and the nitrogen purification is coupled with the regeneration process of oxygen removal of carbon dioxide and water. The oxygen, nitrogen and crude neon and helium gases can be purified and impurities removed in a linked manner, thereby realizing efficient purification of nitrogen, oxygen and crude neon and helium gases.

The invention discloses a bimetallic catalyst for high-selectivity preparation of hexafluoropropylene oxide and application of the bimetallic catalyst, and belongs to the field of catalysts. The active component of the bimetallic catalyst disclosed by the invention is gold-palladium (Au-Pd) alloy nanoparticles loaded on an anatase type TiO2 carrier. Wherein the molar ratio of Au to Pd is (1: 1)-(3: 1), the Au-Pd alloy can give full play to the unique electronic effect within the proportion range, namely, the d-band center of Pd moves downwards, Au is in an electron enrichment state, and the Au-Pd alloy and the Au are in a synergistic effect, so that the oxygen adsorption and activation capacity is remarkably optimized. When the catalyst is applied to preparation of HFPO through HFP gas-phase catalytic oxidation, the bottlenecks of low conversion rate and selectivity, severe reaction conditions and short catalyst life in the prior art can be overcome, and technical support is provided for green and efficient industrial production of HFPO.

The application discloses a lithium type X molecular sieve adsorbent and a preparation method thereof, and belongs to the technical field of adsorption separation. The preparation method of the lithium type X molecular sieve adsorbent comprises two steps of preparing a low-silicon aluminum X molecular sieve and ion exchange. The lithium type X molecular sieve adsorbent prepared by the method has a lithium ion exchange degree of 97.9-99.1%, a molar ratio of SiO2 and Al2O3 of 2.01-2.10, a nitrogen adsorption amount of 32.62-34.94 mL / g, an oxygen adsorption amount of 2.40-2.75 mL / g, and a nitrogen-oxygen separation coefficient of 11.86-14.56.

The utility model belongs to the technical field of air separation, and particularly discloses an internal compression air separation poor krypton xenon extraction device and a start-stop control system, which comprise a lower tower, a main cooler, an upper tower, a gas-liquid separator, a liquid oxygen evaporator, a liquid oxygen adsorber, a liquid oxygen pump and a liquid jet evaporator, all the devices are communicated through pipelines, liquid oxygen is buffered through the gas-liquid separator before entering the liquid oxygen pump, the capacity of rapidly switching two working conditions of producing poor krypton xenon and not producing poor krypton xenon is achieved, and due to the fact that the gas-liquid separator does not participate in heat exchange and rectification, potential safety hazards do not exist in the change of the liquid level of the gas-liquid separator. Therefore, the safety of rapid working condition switching equipment can be guaranteed, and stable working condition operation of the main tower is guaranteed.

The invention provides a high-purity liquid argon purification method and a purification device thereof, and relates to the field of liquid argon purification, the high-purity liquid argon purification method and the purification device thereof are characterized in that a raw material liquid argon supply unit can provide crude liquid argon with the oxygen content of 1-5 ppm, and then the crude liquid argon is gasified through a heat exchange cold box; the method comprises the following steps: blowing hydrogen into a high-purity liquid argon storage tank, pressurizing gasified argon to 0.5-1.0 MPa through an oil-free compressor, reacting the blown hydrogen with oxygen through a catalytic deoxidation unit to produce water molecules, absorbing the water molecules and the oxygen through an adsorption purification unit, liquefying the purified argon through a liquefaction reflux unit, and storing the liquefied argon in the high-purity liquid argon storage tank. According to the invention, the crude liquid argon can be rapidly and stably purified, hydrogenation catalytic deoxidization and adsorption purification are taken as a core, efficient purification is realized through gradient utilization of cooling capacity and intelligent control, and the purification cost can be effectively reduced.

The application provides a Pd-based catalyst and a preparation method and application thereof, and relates to the technical field of catalytic chemistry.The Pd-based catalyst comprises a carrier, Pd and a non-noble metal active component supported on the surface of the carrier; and the non-noble metal of the Pd and the non-noble metal active component is in an atomic-scale spatial separation structure.The Pd-based catalyst has a stable atomic-scale spatial separation structure, and when applied to alcohol catalytic oxidation reaction, alcohol is adsorbed and dehydrogenated on a Pd active site, the removed hydrogen atoms migrate to a non-noble metal active site in an atomic-scale range, and combine with active oxygen adsorbed on the non-noble metal active site to form H2O and are removed, alcohol adsorption and oxygen adsorption are separated on the Pd and the non-noble metal active site, and the catalytic efficiency is improved.

This invention provides a method for detecting the oxygen recombination efficiency of AGM batteries, belonging to the field of lead-acid battery technology. The method first weighs the oxygen adsorption device to obtain m1, and then charges a fully charged battery until a mixed gas is released. The resulting mixed gas is then subjected to deacidification and drying, and then adsorbed by the oxygen adsorption device to obtain the remaining gas. After oxygen testing, the test continues. After t hours of testing, the oxygen adsorption device is weighed to obtain m2. Then, according to n1=(m2-m1) / M 氧 Calculate the amount of oxygen contained in the battery under test, n1; then select a supersaturated battery and determine the oxygen content using the above steps to obtain the amount of oxygen contained in the supersaturated battery, n2; finally, apply the formula η 氧气 The oxygen recombination efficiency of the battery under test can be obtained by calculating (n2-n1) / n2. The detection method of the present invention can ensure that the gas values ​​of collected oxygen are more reliable.

The utility model relates to the technical field of VPSA (Vacuum Pressure Swing Adsorption) oxygen production, in particular to a novel VPSA oxygen production adsorber. According to the novel VPSA oxygen production adsorber, air can be fed in the upper direction and the lower direction at the same time, the air feeding speed is increased, the molecular sieve makes contact with air, and the oxygen production efficiency is improved. A novel VPSA oxygen production adsorber comprises a barrel, a lower seal head, a lower air inlet pipe, an air outlet pipe and the like, the lower side of the barrel is connected with the lower seal head, the lower side of the middle of the lower seal head is connected with the lower air inlet pipe, and the right side of the barrel is connected with the air outlet pipe. Air enters the barrel from the lower air inlet pipeline and the upper air inlet pipeline, so that the air inlet rate is increased, the molecular sieve and the air can be more sufficient and uniform, air can be simultaneously fed from the upper direction and the lower direction, the air inlet rate is increased, the molecular sieve is in uniform contact with the air, and the service life of the molecular sieve is prolonged. And the novel VPSA oxygen production adsorber has the effect of improving the oxygen production efficiency.

The present disclosure relates to a water splitting catalyst including a porous carbon layer, a bimetallic metal alloy core dispersed on the porous carbon layer, and a single-atom precious metal dispersed on the bimetallic metal alloy core, in which oxygen is adsorbed on the surface of the bimetallic metal alloy core.

The invention discloses an ORR catalyst with a flexible structure as well as a preparation method and application of the ORR catalyst, and relates to the field of electro-catalysis. The structure of the electrocatalyst is that supramolecules or macromolecules with flexible structures are anchored on the surfaces of noble metal alloy nanoparticles loaded on a carbon black carrier, which is attributed to the entropy change of anchored molecules caused by oxygen adsorption, so that the desorption of key species in the oxygen reduction process is accelerated, and the reaction activity is obviously improved compared with that of a noble metal alloy catalyst. When the catalyst is used for a cathode of a proton membrane fuel cell, the output power of the catalyst is up to 2.07 W cm <-2 > under the condition that the use amount of the noble metal is as low as 0.1 mg cm <-2 >.

The invention provides a rainwater bioretention facility capable of removing halogenated benzene pollutants, and belongs to the technical field of water treatment.The rainwater bioretention facility comprises a plurality of treatment units which are arranged in a stepped mode and each comprise a pond body, a planting filler layer, a dissolved oxygen adsorption filler layer, a dechlorination filler layer and a first gravel layer, and the planting filler layers, the dissolved oxygen adsorption filler layers, the dechlorination filler layers and the first gravel layers are sequentially arranged in the pond bodies from top to bottom; a water outlet is formed in the lower part of the rear side of the tank body of the lowest treatment unit, and L-shaped pipes arranged at the lower parts of the tank bodies of the rest treatment units are connected with the next-stage treatment unit; except the first-stage treatment unit, transparent step-shaped stop blocks and splash plates are arranged above the planting filler layers of the other treatment units at intervals; and a plurality of herbaceous plants are planted on the planting filler layer. The bioretention facility can effectively remove toxic halogenated benzene series pollutants in rainwater, avoid the toxic action of the halogenated benzene series pollutants on nitrification and denitrification microorganisms, guarantee the efficient denitrification efficiency of the bioretention facility, effectively intercept particulate matters in the rainwater, avoid filler blockage and prolong the service life.

The application relates to the field of coating materials, and discloses a pure titanium material coating sensor for detecting low-concentration ammonia gas as well as a preparation method and application of the sensor. The sensor comprises a pure titanium material, a micro-arc oxidation coating and an electrode; the micro-arc oxidation coating is arranged on the surface of the pure titanium material through micro-arc oxidation of a sodium silicate, sodium stannate trihydrate and zinc acetate electrolyte; and the electrode is arranged on the micro-arc oxidation coating. The SnO2 / TiO2 coating capable of being applied to the detection of low-concentration ammonia gas under a high-humidity environment is formed on the surface of the pure titanium material through micro-arc oxidation of the composite electrolyte of sodium silicate, zinc acetate and sodium stannate trihydrate; the electrode is arranged, and the oxygen adsorption-desorption principle is utilized for detection; compared with conventional gases, the sensor exhibits excellent sensitivity and selectivity to ammonia gas, and therefore can effectively, timely and simply detect ammonia gas.

The invention relates to the technical field of lithium ion batteries, and discloses slurry for a battery diaphragm, the battery diaphragm, application of the battery diaphragm and a lithium ion battery. The slurry contains a main agent and an auxiliary agent, and the main agent contains an oxygen adsorbent and an oxygen fixing agent; the oxygen adsorbent is a zeolite molecular sieve, and the oxygen fixing agent is oxygen-deficient titanium dioxide; the content mass ratio of the oxygen adsorbent to the oxygen fixing agent is 1: (0.1-10). The slurry provided by the invention is coated on a diaphragm, so that oxygen in a battery can be reduced, the problem of battery expansion caused by gas production of a lithium-rich nickel-based lithium supplementing agent is solved, the safety risk of the battery is reduced, and the cycle life and the safety of the battery are improved.

The invention belongs to the technical field of oxygen production, and particularly relates to low-pressure variable-pressure oxygen adsorption equipment which comprises an air compressor, a filter, a buffer tank, an oxygen storage tank and two groups of adsorption towers, and each group of adsorption towers is composed of an initial-end adsorption tower and a tail-end adsorption tower which are connected in series. The device further comprises a first valve assembly, a second valve assembly, a third valve assembly, a fourth valve assembly, a fifth valve assembly, a sixth valve assembly, a seventh valve assembly, an eighth valve assembly and a ninth valve assembly. The first valve assembly switches the two initial-end adsorption towers to be communicated with the buffer tank by collecting the same-end pressure difference of the same-end adsorption towers in the two sets of adsorption towers. The two groups of adsorption towers are automatically switched by using the pressure difference of the same ends of the two adsorption towers at the same end in the two groups of adsorption towers, so that the related structure for realizing the automatic switching is simple, and the cost is relatively low.

The present invention provides an oxygen generator startup method, comprising the following steps: starting an air compressor and an expander and pressurizing an air separation tower; entering a purification phase, opening a main refrigerant discharge valve in front of a liquid oxygen adsorber to discharge liquid enriched oxygen; opening a lower tower liquid air discharge valve to discharge liquid enriched oxygen from the air separation tower; controlling the gas discharge pressure and oxygen product release rate outside the tower, and opening a liquid nitrogen regulating valve to a certain position to return the air separation tower to a normal regulation state; adding crude argon when the oxygen purity of the device rises to a set value A; when the argon fraction exceeds a preset value B and the crude argon tower condenser pressure rises to a preset value C, regulating the crude argon tower condenser pressure to D via a flow valve; and returning the crude argon tower condenser to a normal operating state. The present invention employs a method of discharging some liquid air and liquid oxygen to lower the main refrigerant liquid level during the cold startup of the air separation unit, thereby shortening the cold startup time of the unit.

The invention relates to the technical field of metal materials, in particular to an antioxidant steel component design method based on first principle calculation, which comprises the following steps: constructing an initial surface model, calculating oxygen adsorption energy and adsorption configuration, screening alloy elements and constructing a surface adsorption model. And the influence of alloy elements on the surface adsorption energy of oxygen molecules in the Fe (100) surface model is determined, so that component screening, optimization and design are carried out on the anti-oxidation steel. Through the introduction of first principle calculation, the trial and error cost and period of component design are greatly reduced, the oxidation resistance of the steel is remarkably improved, and the service life of the steel in a high-temperature environment is prolonged.

The present invention relates to an oxygen production adsorption tower with a composite adsorption bed. The composite adsorption bed comprises, from top to bottom, an exhaust port, a composite adsorption bed, a support plate and an air inlet. The outer side of the composite adsorption bed is an air inlet channel, the inner side is an air outlet channel, the top of the air outlet channel is connected to the exhaust port, and the bottom of the air inlet channel is connected to the air inlet. The composite adsorption bed is filled with adsorption material, and the adsorption material comprises Li-LSX molecular sieve and Ca-LSX molecular sieve. A portion of the composite adsorption bed close to the air inlet channel is completely filled with Li-LSX molecular sieve, and a portion close to the air outlet channel is completely filled with Ca-LSX molecular sieve. The volume ratio of Ca-LSX molecular sieve to Li-LSX molecular sieve in the remaining portion of the composite adsorption bed is 1:(1-5.7).

The invention discloses application of a Zn2In2S5 / PDA photocatalytic material with a photo-thermal synergistic effect, and belongs to the technical field of photocatalytic composite materials and hydrogen peroxide (H2O2) production. The Zn2In2S5 / PDA photocatalytic material is used for photocatalytic production of H2O2, and the catalytic rate of the Zn2In2S5 / PDA photocatalytic material can reach 9180 [mu] M.h <-1 >. G <-1 >. The material is prepared through an in-situ polymerization method and comprises the following steps: firstly, carrying out hydrothermal synthesis on Zn2In2S5 nanoflowers, and then adding dopamine hydrochloride into a weakly alkaline solution containing Zn2In2S5 to carry out in-situ auto-polymerization, so as to obtain the PDA modified Zn2In2S5 composite material. According to the invention, the p-n type heterojunction is successfully constructed, the introduction of PDA not only widens the photoresponse range to the full spectrum, but also improves the microcosmic temperature of the surface of the catalyst by using the photothermal effect of PDA, effectively promotes the separation and transmission of photon-generated carriers, and optimizes the oxygen adsorption capacity. Compared with pure Zn2In2S5, the photocatalytic H2O2 production performance of the composite material is remarkably improved, the preparation process is simple, the structure is stable, and a new way is provided for efficient H2O2 production.

The invention relates to the technical field of integrated circuit manufacturing, and discloses a multilayer composite ceramic metal packaging method for a high-temperature pressure sensor, and the method comprises the steps: executing atmosphere chemical potential pinning operation when the temperature of a sintering furnace enters a maximum shrinkage rate temperature region of a metalized functional layer; the dew point is increased to a pinning set value by adjusting the wet-hydrogen ratio of the process gas, so that the oxygen partial pressure is in a metastable state interval of oxidation-reduction reaction balance; according to the method, by introducing a chemical potential control dimension independent of a thermal field and utilizing a metastable state oxygen adsorption micromechanism, excessive shrinkage of the refractory metal in a specific temperature zone is inhibited in a targeted mode, and therefore the thermal field of the refractory metal can be effectively controlled. Transient shear stress generated by dynamic mismatch of a heterogeneous interface is eliminated, and the air tightness and the mechanical stability of the packaging structure under the high-temperature working condition are improved.

The invention relates to the technical field of material engineering, in particular to an anti-oxidation device for high-temperature reduction-liquid phase sintering and a using method of the anti-oxidation device for high-temperature reduction-liquid phase sintering. According to the device, a three-level protection system is constructed, and a deoxidation device, an oxidation sacrifice material and a reduction medium form a functional module. According to the specific implementation architecture, a deoxidation pipe filled with oxygen adsorption particles is arranged between a flow controller and a hearth, and a gradient oxidation sacrificial material is placed between a flange connector in the hearth and a workpiece to be treated; the process method comprises the following key procedures: constructing a reducing medium adsorption system in a hearth; carrying out vacuum sealing operation and then introducing a reducing atmosphere; according to the technical scheme, through the design of a three-dimensional protection structure, the loading density of the sample is improved, meanwhile, a continuous anti-oxidation environment is formed through a dynamic release mechanism of a reducing agent, and the method is particularly suitable for the working condition of long-period high-temperature reduction-liquid phase sintering treatment of the SOFC porous Fe-Cr metal supporting body.

The application discloses a glove box glove leak rate detection device and a detection method, a detection cabin, the detection cabin is provided with a cavity and a glove mounting piece, the glove mounting piece is located at one end of the cavity and is fastened and connected with the cavity; the glove mounting piece is provided with a convex part with a hollow circular opening, a glove to be detected, the convex part and the cavity jointly form a space to be detected; a vacuum pump is used for extracting air in the space to be detected; a nitrogen source cooperates with the vacuum pump and is used for injecting nitrogen into the space to be detected to reduce the oxygen content of the space to be detected; an oxygen adsorption circulation system further adsorbs and purifies oxygen in the cavity on the basis of oxygen removal by the vacuum pump and the nitrogen source, so as to provide a low-oxygen environment. By means of the above-mentioned device, the oxygen concentration changes of standard gloves and gloves to be detected are compared, the glove leak rate is calculated, and through multi-stage parameter correction and multiple sealing design, the background leak rate of the equipment is effectively reduced, and the reliability of the test result is improved.

This invention relates to the field of catalyst preparation, specifically disclosing a PEM water electrolysis hydrogen production catalyst material and its preparation method. Using a manganese-cobalt-samarium metal composite oxide as a support, iridium oxide is loaded onto it, forming a unique catalyst composite material structure. During the preparation process, by precisely adjusting the metal addition ratio and optimizing process parameters and preparation sequence, not only is a low iridium content ensured, but the catalyst's activity and stability are also significantly improved. The excellent electrical conductivity of the manganese-cobalt-samarium metal composite oxide, along with the crystallization of iridium oxide on its substrate, effectively improves electron binding, increases binding sites, and optimizes oxygen adsorption capacity. This allows the catalyst composite material to maintain high catalytic performance while achieving effective cost control, laying a solid foundation for its widespread application.

The present invention provides a supported catalyst for synthesizing methyl methacrylate. The catalyst includes a carrier and an active component arranged on the carrier. The carrier is a Ce-M-N composite oxide treated with glow discharge plasma. The active component is Au, M is selected from one or more of Al, Ni, Cu, and Zr, and N is selected from one or more of K, Ca, Ba, and Mg. The Au loading is 0.5-3.0 wt%. The supported catalyst for synthesizing methyl methacrylate and a preparation method thereof are provided. The Ce-M-N oxide composite is used as a carrier and is composited with M to reduce its oxygen vacancy formation energy, making it easier to form oxygen vacancies. The electrons and negatively charged high-energy particles in the glow discharge plasma are utilized to generate oxygen vacancies in CeO2. The oxygen vacancies are easily activated by oxygen adsorption, thereby facilitating the oxidative esterification reaction of methanol and methacrolein, thereby improving the activity of the catalyst.