81 results about "Catalytic particle" patented technology

The invention provides a physical response data analysis method and system based on aircraft catalytic operation, and the method comprises the steps: obtaining three-dimensional cloud particle distribution data sets of a catalytic operation region before and after the catalytic operation through airborne cloud particle detection equipment, the three-dimensional cloud particle distribution data set comprises particle characteristic data before catalysis and particle characteristic data after catalysis; performing morphological feature extraction processing on the pre-catalysis particle feature data and the post-catalysis particle feature data by adopting a cloud particle AI image shape recognition algorithm to generate a pre-catalysis particle morphological difference feature set and a post-catalysis particle morphological difference feature set; constructing a dynamic physical response evaluation model, inputting the particle morphological difference feature set into the dynamic physical response evaluation model to execute multi-dimensional response correlation analysis, and generating a dynamic response feature set of the catalytic operation; and generating a catalytic strategy optimization instruction set according to the dynamic response feature set, and transmitting the catalytic strategy optimization instruction set to the airborne catalytic control system for catalytic parameter adjustment operation.

The invention discloses a piezoelectric effect excitation method and application thereof. The piezoelectric effect of piezoelectric catalytic material particles is excited by applying mechanical stress to the piezoelectric catalytic material particles through rotational flow oscillation. According to the piezoelectric effect excitation method provided by the invention, the piezoelectric effect of the piezoelectric catalytic material is excited by adopting rotational flow oscillation, the excitation effect on the piezoelectric effect of the piezoelectric catalytic material particles in the rotational flow field can be realized through relatively low energy input, and no matter how large the reactor exists, the piezoelectric effect can be excited. All the piezoelectric catalytic particles in the rotational flow field can be subjected to large rotational flow oscillation mechanical stress, so that the piezoelectric effect of the piezoelectric catalytic material particles in the rotational flow field in the reactor can be effectively excited, the catalytic efficiency of the piezoelectric catalytic material particles is improved, and a foundation is laid for large-scale application of piezoelectric catalytic materials.

The invention discloses a plasma hydrodynamic cavitation aeration coupled piezoelectric catalysis organic wastewater treatment system and method. The system comprises a wastewater tank, a water pump, a Venturi tube hydrodynamic cavitator, a catalytic oxidation reactor, a piezoelectric particle separator, a piezoelectric catalytic particle bin, a low-temperature plasma generator and an air pump. By coupling piezoelectric catalysis, pressure pulsation mechanical energy generated by hydrodynamic cavitation is converted into chemical energy for driving the piezoelectric effect, on one hand, pollutants are directly oxidized, and on the other hand, plasma by-product H2O2 is efficiently converted into. OH with strong oxidizing property, so that cooperation with plasma advanced oxidation is formed, and the pollutant removal efficiency is improved. The pollutant degradation energy efficiency and the energy utilization rate of the system are greatly improved. Meanwhile, the system realizes efficient recovery and cyclic utilization of the magnetic piezoelectric catalytic particles through the magnetic separation type piezoelectric particle separator, so that secondary pollution of the catalyst is fundamentally avoided.

The invention relates to the technical field of flexible sweat sensors, in particular to a preparation method and application of a laser-induced graphene oxide nanofiber membrane. Comprising the following steps: S1, preparing a graphene oxide nanofiber membrane through an electrostatic spinning process; s2, carrying out laser reduction on the graphene oxide nanofiber membrane, namely engraving an electrode pattern on the graphene oxide nanofiber membrane by adopting a laser, and reducing on the electrode pattern of the graphene oxide nanofiber membrane to generate an LGNF electrode; s3, performing hydrophobic treatment on the graphene oxide spinning fiber membrane; s4, catalytic particles and enzyme are modified on the LGNF electrode, and the laser-induced graphene oxide nanofiber membrane is prepared. The method is simple, efficient, convenient and easy to implement, low in requirement for manufacturing equipment and capable of well achieving mass production, and the sensor prepared through the method can spontaneously absorb sweat to the surface of the electrode to achieve sweat monitoring, so that the hydrophilicity of graphene can be effectively improved, and the electrochemical performance of graphene is improved.

The invention relates to the technical field of degradation-resistant organic wastewater treatment, in particular to a cathode and anode type electro-Fenton coupling wastewater treatment device and method.The cathode and anode type electro-Fenton coupling wastewater treatment method comprises the steps that a titanium electrode or a BDD electrode is adopted in an anode module, 0.05-0.5 mol / L sulfate radical serves as electrolyte, and persulfate is electrically synthesized in situ; a cathode module is a porous carbon electrode, and # imgabs0 # is generated through aeration at the speed of 0.5 L / min to 2 L / min; the space between the cathode modules is filled with three-dimensional invasive plant source biochar catalytic particle electrodes, the H-type double-chamber electrolytic tank separates a cathode chamber and an anode chamber through a proton membrane, and the method comprises an intermittent type (firstly adsorbing trace pollutants and then oxidizing, and biochar is renewable) and a continuous type (synchronously adsorbing and degrading high-concentration wastewater, and pretreating to improve biodegradability). The device realizes the cooperation of adsorption and electrocatalytic oxidation, efficiently treats refractory wastewater, promotes the recycling of invasive plants, and has both environmental protection and economic values.

The present application relates to the field of environmental protection additives, specifically disclosing a natural gas low-temperature combustion-supporting environmental protection additive and its preparation method. The natural gas low-temperature combustion-supporting environmental protection additive comprises the following substances in parts by weight: 10 to 50 parts of dimethyl carbonate, 0 to 10 parts of methyl tert-butyl ether, 10 to 20 parts of methanol, and 15 to 20 parts of dispersed catalytic particles; the dispersed catalytic particles are carbon aerogels adsorbed with nano-Pt particles. The natural gas low-temperature combustion-supporting environmental protection additive of the present application uses dimethyl carbonate, methyl tert-butyl ether, and methanol as liquid matrices, and a carbon aerogel material adsorbed with the precious metal Pt as a catalytic material. The environmental protection additive material is effectively coated and loaded in the boiling gas phase. A uniform bonding form is formed between the gas-phase environmental protection additive and the natural gas, so that the methane in the natural gas opens the gas-hydrogen-oxygen bond under the action of the environmental protection additive at 80 to 100°C, effectively catalyzing the combustion of natural gas in an oxygen-rich state, further improving the activity of natural gas in a low-temperature environment.

The invention belongs to the technical field of advanced oxidation and membrane separation, and particularly relates to a PES / CP / CoCo-PBA composite catalytic membrane and a preparation method and application thereof.The PES / CP / CoCo-PBA composite catalytic membrane comprises a PES basement membrane and a catalytic activity layer combined on the PES basement membrane in situ through a phase inversion method, the catalytic activity layer is made of a CP / CoCo-PBA composite material, and the preparation method of the composite catalytic membrane comprises the steps that the PES basement membrane and the catalytic activity layer are combined in situ through a phase inversion method; the CP / CoCo-PBA composite material is formed by enabling catalytic particles CoCo-PBA to grow on a carbon material in situ through a hydrothermal method. The PES / CP / CoCo-PBA composite catalytic membrane provided by the invention has excellent catalytic degradation performance and good stability, not only has conductivity to realize the effect of electrochemically activating PMS, but also can keep higher mechanical strength and pollution resistance to meet the requirements of long-term operation and large-scale industrial application.

The device disclosed by the invention integrates the photocatalytic reaction area, the diversion area, the settling area and the piezoelectric photocatalytic particle hopper, and the propeller blades are effectively driven to rotate through a dual driving mechanism of water jet and the aeration device, so that the screw rod is driven to work, and piezoelectric photocatalytic particles are lifted to the top of the reactor. In the process, the rotation of the screw rod is linked with the operation of the micro generator, and the generated electric energy is directly supplied to the LED light source and the electrode plate, so that the overall energy consumption of the reaction device is greatly reduced. Under the action of double external forces of aeration and stirring, a strong piezoelectric field is excited inside the piezoelectric material, so that the coupling of a photocatalytic effect and a piezoelectric effect is realized. And then, the photocatalytic particles are continuously and uniformly distributed in the reactor in a circulating manner by virtue of the rotating power of lifting of the baffle and the screw rod. Besides, the aeration device not only enhances the reaction efficiency, but also provides necessary driving force for piezoelectric photocatalytic particles, and realizes the self-cleaning function of the particles, so that the photocatalytic reaction rate and the recycling efficiency of a photocatalyst are remarkably improved.

The piezoelectric electro-catalytic reactor for treating the organic pollutants in the wastewater is constructed, the effects of high light utilization efficiency, energy conservation and environmental protection are achieved, a stainless steel tank-shaped reactor is adopted, LED lamps serve as light sources and are evenly arranged on lamp panels on the two sides of a piezoelectric electro-catalytic area, a magnetic field is added to the lower portion, aeration is used as an auxiliary means, and the energy-saving and environment-friendly effects are achieved. Organic pollutants in a water body are subjected to photocatalytic degradation, the spiral rod is driven to rotate through the pushing effect of kinetic energy of fluid on the propeller, piezoelectric electro-catalytic particles are conveyed to the upper portion of the reactor, meanwhile, self-cleaning of the particles is conducted, and then the piezoelectric electro-catalytic particles are evenly distributed through the baffle by means of the stirring effect of the stirring paddle. And sufficient contact between the particles and the water body is realized. Separation of piezoelectric electro-catalysis particles from the treated water body is completed in the settling area through the flow guide area and the flow baffle, the particles flow back to the particle hopper and participate in the reaction again, an emptying pipe is arranged at the bottom of the reactor, and the piezoelectric electro-catalysis particles can be discharged and replaced.

The device is provided with a photocatalytic reaction area, a diversion area and a settling area piezoelectric photocatalytic particle hopper, a spiral rod is driven to lift piezoelectric photocatalytic particles to the upper part of a reactor by utilizing the driving effect of water flow jet flow on a spiral blade, and meanwhile, a stirring blade is driven to fully mix the particles with a wastewater solution; a piezoelectric field is generated in the piezoelectric material under the action of double external pressure of aeration and stirring to realize coupling of a photocatalytic effect and a piezoelectric effect, then photocatalytic particles are uniformly distributed in the reactor through a baffle by virtue of the rotation action of a screw rod, and the piezoelectric photocatalytic particles can be self-cleaned by hydraulic stirring, so that the photocatalytic effect is greatly improved. Therefore, the efficiency of the photocatalytic reaction and the recycling of the photocatalyst are improved. And low-cost and high-efficiency operation of the photocatalytic reactor is realized.

The invention discloses a width gradient tungsten disulfide nanobelt, a preparation method thereof and an application of the width gradient tungsten disulfide nanobelt in a self-driven photoelectric detector, a Ni film is deposited on a substrate and is annealed to form catalytic particles, and a chemical vapor deposition system is utilized to accurately control the temperature gradient between tungsten trioxide in a central temperature zone and a growth substrate in a downstream temperature zone, so that the width gradient tungsten disulfide nanobelt is obtained. And the solid sulfur source is propelled at a constant rate, the dynamic change of the sulfur / tungsten atomic ratio in the reaction environment is regulated and controlled, and a growth mode is guided to be converted from a gas-liquid-solid mechanism to a gas-solid mechanism, so that controllable preparation of the tungsten disulfide nanobelt with the width continuously and progressively decreased in the axial direction is realized. The width of the nanobelt gradually changes from 150-500 nm to 50-120 nm, the length of the nanobelt reaches 3-12 [mu] m, and the nanobelt has an armchair edge and a 3R phase stacking structure. A self-driven photoelectric detector constructed based on the nanobelt realizes high-sensitivity detection of 532 nm laser under zero bias voltage, the responsivity reaches 5.04 A / W, the detectivity reaches 3.23 * 10 < 12 > Jones, and the nanobelt shows important application value in the fields of optical signal detection, optical switches and wireless optical communication.

The invention relates to a Pt-Pd composite electrode and a preparation method and application thereof. The preparation method comprises the following steps: placing a conductive substrate in an electro-deposition liquid, taking the conductive substrate as a working electrode, sequentially carrying out first electro-deposition and second electro-deposition, and forming a Pt-Pd composite catalyst layer on the surface of the conductive substrate to prepare the Pt-Pd composite electrode, the electro-deposition liquid comprises a platinum source, a palladium source and a supporting electrolyte. The Pt-Pd composite electrode is prepared through cooperation of Pt and Pb, the structural stability of the electrode is remarkably improved, meanwhile, layer-by-layer growth of catalytic particles is achieved in the mode that first electrodeposition and second electrodeposition are combined, it is guaranteed that catalytic active sites are fully exposed, it is also guaranteed that the binding force between a plating layer and a substrate is extremely high, and the service life of the plating layer is prolonged. The electrode is used for electrochemically synthesizing ammonia, has relatively high Faraday efficiency, is particularly suitable for long-term operation under high current density, and has a good industrial application prospect.

The invention belongs to the technical field of catalysts, and particularly relates to a monolithic carbon monoxide adsorption catalyst and a preparation method thereof. The monolithic carbon monoxide adsorption catalyst is loaded with metal catalytic particles, and the metal catalytic particles comprise copper particles, manganese particles and cerium particles; a carrier of the integral carbon monoxide adsorption catalyst is coated with gamma-aluminum oxide, and the catalyst is also loaded with lanthanum oxide. The monolithic carbon monoxide catalyst provided by the invention is relatively high in sulfur resistance and water resistance.

The invention relates to the technical field of printed circuit boards, and discloses a process method for optimizing a copper lattice to improve the binding force of a plating layer, which comprises the following steps of: glue residue removal treatment: carrying out glue residue removal treatment on a drilled printed circuit board to form a roughened structure on the surface of a hole wall; activating treatment: adsorbing palladium catalytic particles on the coarsened pore wall surface to form a uniformly distributed catalytic center; and chemical copper deposition: immersing the activated plate in a chemical copper solution, controlling the reaction temperature to be 41-45 DEG C, maintaining the concentration of copper ions, alkali and a reducing agent through automatic compensation and liquid mixing, and depositing on the hole wall to form an initial copper layer. The technological method for optimizing the copper lattice to improve the coating binding force aims at solving the problems that in high-density interconnection and high-speed and high-frequency printed circuit board manufacturing, due to the fact that a traditional chemical copper plating technology lacks dynamic regulation and control capacity, the coating binding force is insufficient, the lattice structure is loose, and uniformity is poor.

The invention discloses a flue gas denitration agent which comprises the following components in percentage by weight: 30%-50% of organic amine, 45%-60% of polyol, 1%-5% of bio-oil, 0.2%-0.5% of an emulsifier, 0.1%-0.2% of a nanoparticle catalyst and 0.05%-0.1% of a bactericide, and relates to the technical field of flue gas treatment. According to the flue gas denitration agent and the denitration process thereof, various components such as organic amine, polyol, bio-oil, an emulsifier, a nanoparticle catalyst and a bactericide are compounded, all the components have a synergistic effect and give full play to respective advantages, the organic amine serves as a reducing agent to provide a nitrogen source, the polyol plays a role in dispersion and stabilization, and the bio-oil has a synergistic effect. The bio-oil improves the local cracking temperature and promotes the denitration reaction, the emulsifier enables all the components to form a uniform microemulsion structure, the nanoparticle catalyst provides more active sites and improves the reaction rate, the bactericide guarantees the storage stability of the denitration agent, the nano catalytic particles serve as the core, a multi-layer distributed microemulsion structure is formed, and the denitration effect is improved. And uniform distribution of liquid drops in the spraying process is ensured.

The present disclosure provides a system comprising a reactor, a medium temperature heating section and a superheating section. The reactor comprises a moving packed bed of catalytic particles and a feed gas interacting with the catalytic particles. A decomposition and reaction section of the reactor is configured to receive the catalytic particles and the feed gas, and to provide heat transfer between the catalytic particles and the feed gas such that a reaction occurs that generates a gaseous product and a solid product. The medium temperature heating section is configured to heat at least one of gases or catalytic particles to a first defined temperature, and the superheating section is configured to heat the at least one of gases or catalytic particles received from the medium temperature heating section with an electrical system and to provide the at least one of gases or catalytic particles heated to the reactor.

The invention belongs to the field of catalysts, and particularly relates to a monolithic carbon monoxide catalyst as well as a preparation method and application thereof. The monolithic carbon monoxide catalyst comprises a carrier and metal catalytic particles loaded on the surface of the carrier, and the loading capacity of the metal catalytic particles is 90kg / m < 3 >-150kg / m < 3 >. The integral carbon monoxide catalyst is relatively high in sulfur resistance and water resistance, so that the catalyst is high in catalytic stability in sintering flue gas purification. The loading capacity of the metal catalytic particles in the integral carbon monoxide catalyst is 90-150kg / m < 3 >, so that the integral carbon monoxide catalyst has high adsorption capacity on carbon monoxide and is not easy to agglomerate in the catalysis process. Aiming at complex sintering flue gas conditions, synergistic combination of vanadium group elements, chromium group elements, precious metal elements and the like is achieved by adding the auxiliaries, and meanwhile precious metal is promoted to be highly dispersed to the nanometer size, so that the precious metal nanometer catalyst is formed. The catalyst produced by the method not only has high loading strength and excellent catalytic efficiency, but also can keep excellent catalytic performance in a sintering flue gas environment in which various complex components such as water, sulfur, nitrate, ammonium and dust exist. The water-resistant sulfur-resistant rubber has the characteristics of excellent water resistance and sulfur resistance.

A process for fabricating a circuit board uses a catalytic dielectric core having catalytic particles, a foil top surface, and a thin foil bottom surface with a foil backing of sufficient thickness to absorb heat from a laser drilling operation to prevent the penetration of the thin foil bottom surface during laser drilling. A sequence of steps including a laser drilling step, removing the foil backing step, electroless plating step, patterned resist step, electroplating step, resist strip step, tin plate step, and copper etch step are performed, which provide dot vias of fine linewidth and resolution.

The invention relates to a laser activation direct chemical plating sensitized material and application thereof, and belongs to the field of PCB (Printed Circuit Board) manufacturing technology and chemical plating. The method comprises the following steps: firstly, providing a laser-sensitized material which is used as an activated bridging layer on the surface of an epoxy resin substrate; and then a metal catalytic source in the catalytic active agent can be reduced into metal particles with efficient catalytic activity in combination with a laser activation technology, so that the subsequent chemical copper plating reaction is catalyzed. The metal catalytic particles are effectively embedded into the middle modified layer after laser activation, so that the interface incompatibility between the activated bridging layer and the deposited copper layer is weakened, and the binding force between the epoxy resin substrate and the chemical plating layer is improved. The diazo photosensitizer can effectively enhance the utilization rate of laser energy by the substrate in the laser activation treatment process, so that the substrate achieves an excellent activation effect under proper laser power, and the catalytic efficiency in the chemical plating process is improved; and meanwhile, the machining precision of fine copper conductive pattern manufacturing can be obviously improved, and the uniformity of the surface of a chemical deposition copper layer is improved.

This invention discloses a method for preparing a magnetic nanofiber tubular membrane based on the antifouling function of separable magnetic particles, comprising the following steps: 1) thoroughly mixing equal volumes of iron salt solution and fumaric acid solution and then subjecting the mixture to ultrasonic treatment, followed by a hydrothermal reaction; 2) thoroughly mixing the solid product obtained in step 1) with a sulfiding agent-ethanol solution at a certain mass ratio, and then continuing the hydrothermal reaction to obtain Fe3S4 magnetic catalytic particles; 3) weaving polyester fibers into a braided tube and nesting it on axially stacked magnetic tubes to form a magnetic braided tube; 4) dissolving the fiber-forming polymer in a solvent to obtain a uniform and stable spinning solution; using the magnetic braided tube obtained in step 3) as a receiver, the spinning solution obtained in step 4) is spun into a magnetic nanofiber tubular membrane using electrospinning technology; 6) loading the magnetic catalytic particles obtained in step 2) onto the surface of the membrane obtained in step 5), thereby obtaining the Fe3S4 / magnetic nanofiber tubular membrane.

A method for growing ultra-long carbon nanotubes includes operating a chemical vapor deposition (CVD) system to grow a carbon nanotube, monitoring in real-time the behavior of the catalyst (e.g., catalytic particle) of the CVD system, and dynamically adjusting process conditions for operating the CVD system based on said monitoring to maintain the catalyst (e.g., catalytic particle) active for a longer period of time and grow ultra-long carbon nanotubes that can be used to make yarn that can be used to make ropes, fabrics or macroscopic wires with higher strength that can be used in structural applications.

The application discloses a kind of photo-thermal synergic self-heating carbon capture and in-situ conversion method and device, it is related to flue gas carbon dioxide capture and resource utilization technical field, wherein the method includes: the flue gas containing carbon dioxide is passed into the adsorption tower equipped with core-shell type photo-thermal adsorption catalytic particles, and carbon dioxide is adsorbed by particle core layer at normal temperature;After core layer adsorption saturation, adsorption tower is switched to closed cycle, and the light focusing system is started to focus sunlight, so that shell layer photo-thermal material generates plasmonic resonance effect and forms local high temperature, drives core layer to desorb carbon dioxide;Desorbed carbon dioxide and hydrogen occur hydrogenation reaction on the surface of shell layer catalyst, and in-situ generate liquid formic acid and release reaction heat;Relies on the heat to build self-heating cycle, auxiliary adsorbent is completely regenerated, collects tower bottom liquid formic acid, equipment is switched back to adsorption mode, and complete single-tower complete working cycle.The application realizes carbon dioxide adsorption in-situ conversion by photo-thermal coupling self-heating cycle, and reduces regeneration energy consumption.

The invention discloses an aquatic feed processing waste gas treatment device coupled with spraying and catalytic ozonation, and belongs to the technical field of feed processing, the aquatic feed processing waste gas treatment device comprises at least two catalytic oxidation towers, the two catalytic oxidation towers are arranged in series along a waste gas conveying direction; the induced draft fan is arranged at the downstream of the last-stage catalytic oxidation tower; wherein a wet treatment area and a dry treatment area are sequentially arranged in the catalytic oxidation tower in the waste gas conveying direction; a spraying pipeline and a first ozone injection pipeline are arranged in the wet treatment area; and at least one group of catalytic oxidation components and a second ozone injection pipeline are fixedly arranged in the dry treatment region along the waste gas conveying direction. The device adopts a wet spray oxidation and dry ozone catalysis two-stage coupling process, effectively deals with complex working conditions of aquatic feed waste gas, physically isolates a mixing cavity from a catalytic oxidation cavity, fully pre-mixes ozone and waste gas, periodically sucks by a piston, forcibly pushes mixed gas to penetrate catalytic particles, remarkably strengthens gas-solid mass transfer and improves catalytic efficiency.

The invention discloses a periphyton carrier for breeding tail water virus enrichment and killing and a preparation method thereof.The periphyton carrier is of a core-shell structure, the core is a signal layer with catalytic particles loaded on the surface, the shell is a supporting layer, the signal layer is gel with dispersed cyclic diguanylic acid, and the supporting layer is a gel layer with dispersed cyclic diguanylic acid. The catalytic particles are nano-carriers loaded with sodium percarbonate and potassium ferrocyanide, and the supporting layer is a polymer containing pores. By integrating signal molecule regulation and control and a free radical synergistic inactivation mechanism, the virus enrichment capacity of the biological membrane is optimized, and the in-situ killing efficiency is enhanced. According to the periphyton carrier, the pertinence and response speed of virus treatment are improved, the environmental risk and cost bottleneck of a traditional method are overcome, an innovative solution is provided for safe management of aquaculture water, and the virus inactivation rate can be larger than or equal to 99.9%.

The invention aims to prepare a sandy piezoelectric electro-catalytic particle for degrading organic pollutants in wastewater, and the sandy piezoelectric electro-catalytic particle is wrapped by quartz sand serving as an inner core and a TiO2 / BaTiO3 composite material serving as an outer layer. The piezoelectric effect of the piezoelectric electro-catalytic material means that change and strain of charge distribution can be generated in the material when acting pressure is applied to the outside. The photocatalytic effect means that chemical reaction occurs on the surface of the material under the irradiation of an external light source. The two effects are coupled together by preparing the piezoelectric electro-catalytic composite material, the efficiency of degrading refractory organics in water through the photocatalytic reaction is improved, and the quartz sand is granular, so that the recycling of the photocatalytic material is facilitated, and the preparation method belongs to the technical field of environmental protection.

The present invention relates to the field of catalysts, and specifically to a carbon monoxide catalyst, and a preparation method therefor and a use thereof. The carbon monoxide catalyst comprises a carrier and metal catalytic particles supported in the carrier, or the metal catalytic particles and metal oxide catalytic particles; metals in the metal catalytic particles or the metal oxide catalytic particles include a noble metal, titanium, cerium, cobalt, nickel, and molybdenum. Since the selected carrier and metals have high stability to acids, the sulfur tolerance and water tolerance of the carbon monoxide catalyst are high, so that the carbon monoxide catalyst has high catalytic stability in sintering flue gas purification. The carbon monoxide catalyst provided by the embodiment of the present invention has the catalysis principle of promoting oxidation-reduction reaction of a target gas, and thus, the carbon monoxide catalyst provided by the embodiment of the present invention can also be used for catalyzing other combustible gases such as methane, ethanol, hydrogen, and low-volatile organic compounds.

The present invention discloses a levodopa-specific sensing electrode based on local acidification of a hollow confined structure, a preparation method and an application thereof, wherein the sensing electrode comprises a basic conductive layer and a confined microcavity layer. The basic conductive layer is used to transfer the electrons generated during the cyclization reaction of levodopa to an electrochemical measurement circuit; the confined microcavity layer is formed by modifying a confined microcavity on the basic conductive layer, and the local acidification enzyme and levodopa catalytic particles are fixed on the inner surface of the confined microcavity by utilizing the difference in the diameter of the macromolecular protein, the local acidification enzyme and the pores of the confined microcavity. During measurement, the local acidification enzyme forms a local acidification environment with a pH value less than 5 in the confined microcavity, and the levodopa catalytic particles are used to catalyze and accelerate the reaction rate of levodopa on the electrode. The sensing electrode can be used for the determination of the levodopa concentration in body fluids, which solves the problem that the existing electrochemical sensors are difficult to distinguish between levodopa and dopamine in body fluids, and has a good application prospect.

The invention discloses a sulfur trioxide gas standard generation device and method, a gas dilution mixing system inputs double gas sources and can realize accurate regulation and control of reaction gas concentration and flow, and the outlet end of the gas dilution mixing system is connected with a sulfur trioxide generation system; the sulfur trioxide generation system comprises a reaction furnace, a quartz reaction tube and a heater, the quartz reaction tube is arranged in the reaction furnace, the quartz reaction tube is filled with composite catalytic particles, the outer side of the quartz reaction tube is coated with a heating sleeve, and the heater is embedded in the upper part in the reaction furnace; the outlet end of the quartz reaction tube is respectively connected with a detection system and a collection condensation system through a heat-preservation vaporization system, the output end of the collection condensation system is connected with the detection system, and the output end of the detection system is connected with a tail gas absorption system. The problems of lack of SO3 standard gas and poor stability at present can be effectively solved, a reliable standard substance is provided for accurate monitoring of sulfur trioxide gas, and the performance and the quantity value traceability of detection equipment are improved.

The invention belongs to the technical field of carriers, and particularly relates to a catalyst for preparing low-carbon olefin from CO2 as well as a preparation method and application of the catalyst. Based on a new idea of carbon dioxide capture-conversion coupling, a series of bifunctional catalytic particles K / BayFeO3 (y = 0.6-1.2) with an oxygen carrying function are constructed through potassium / barium coordination and barium regulation strategies. Rich oxygen vacancies on the surface promote CO2 adsorption and dissociation, and the catalytic activity is improved; the strong electron donating performance under K / Ba synergism promotes conversion of intermediate species to olefin, inhibits excessive hydrogenation, and reduces methane. The selectivity of low-carbon olefin C2 =-C4 = is 57% or above, and the alkane ratio O / P is 7.36 or above. The K / BayFeO3 prepared by the method takes perovskite as a structural framework, is excellent in stability and is not inactivated after being continuously used for more than 500 hours, and the catalytic performance is in a stable increasing trend along with the prolonging of the reaction time.