311results about "Chemical analysis using catalysis" patented technology

The invention discloses a catalyst determination method and device and a machine readable storage medium, and relates to the technical field of weather modification. The method comprises the steps that index values of test indexes of a plurality of different types of catalyst samples are obtained respectively, and the index values are the index values of the catalyst samples tested in a preset strong freezing rain simulation environment; the freezing rain key condition is reproduced through the simulation platform, and the deviation between a traditional laboratory and a real scene is overcome. Determining the weight of each test index based on all index values and a weight distribution algorithm; aiming at each type of catalyst samples, based on a multi-criterion decision algorithm and the index value and the weight of each test index, determining an evaluation score of the catalyst samples; and determining the catalyst sample with the highest evaluation score as a target catalyst. By scientifically and comprehensively evaluating the performance of different types of catalysts, a scientific basis is provided for selection and application of the catalysts, and the freezing rain disaster prevention and control cost is reduced.

The present invention relates to a contact combustion gas sensor provided with a coil-exposed detection element for detecting flammable gas leakage, and a method for manufacturing the same, the contact combustion gas sensor being provided with a detection element (210) that reacts with contact gas and a compensation element (260) that does not react with contact gas, the detection element (210) comprising a coil wire (222) and a thermal block (240), the coil wire (222) has a coil shape, an exposed portion of the coil wire (222) that is in direct contact with the outside air performs a direct catalyst combustion reaction with gas in contact with the outside air, and the thermal block (240) is disposed inside the coil wire (222), and a portion of the thermal block (240) is coupled to the coil wire (222) to support the coil wire (222).

The invention relates to a microfluidic reactor for electrocatalytic determination of chemical oxygen demand, and belongs to the field of environmental monitoring. In the reactor, to-be-detected samples are injected from a sample inlet positioned at the front end of a liquid inlet and flow into the reactor formed by stacking three layers of components from the liquid inlet below along with electrolyte, and the to-be-detected samples positioned at different horizontal heights turn along with liquid flow and finally reach the surface of a planar anode at the bottom under the action of a pinch plate distributed with a micro cone group; and the water flows upwards through a hole in one end of the top side of the buckle plate, passes through the auxiliary electrode with the hole and finally flows out of the electrolytic tank through a water outlet in the top. Organic matters in the to-be-detected sample are subjected to electrochemical oxidation reaction under the action of the catalyst on the surface of the planar anode at the bottom of the reactor, and a generated electric signal is used for quantitatively determining the chemical oxygen demand of the to-be-detected water sample. In the invention, the pinch plate distributed with the micro cone group can strengthen organic matters to break through stable horizontal laminar mass transfer, so that the organic matters in the sample to be detected fully reach the surface of the plane anode to generate electrochemical oxidation reaction, thereby improving electric signals and lower limit of detection. According to the characteristics, a more stable and accurate electric signal can be obtained when the reactor is used for measuring the chemical oxygen demand, and the linear range of the measurement is widened, so that the efficient and accurate measurement of the chemical oxygen demand in a sample to be measured is realized.

The invention belongs to the technical field of dry pulverized coal gasifiers, and discloses an experimental method for CaO to catalyze high-temperature coke high-pressure gasification reaction under different atmospheres, which comprises the following specific steps: step 1, preparing experimental raw materials and pretreating to select representative coal types; the diffusion environment of the industrial gasifier is simulated by establishing a cooperative regulation and control mechanism of pressure, gas velocity and pore structure, the thickness of a boundary layer is calculated according to the Fick diffusion law, a diffusion resistance quantitative relational expression is constructed for dynamic correction, and a variable diffusion strength experimental group is designed to quantify diffusion contribution. The diffusion and reaction rate ratio is quantitatively evaluated through a Weber number model, a catalysis and blank control synchronous experiment is carried out at the same time, a catalysis efficiency factor is calculated, a catalysis-diffusion synergistic phase diagram is drawn, and a reaction control region, a diffusion control region and a transition region are definitely defined; and the risk that the reaction stagnation caused by the fact that the high-pressure diffusion retardation effect is misjudged as catalytic activity attenuation or pore collapse is mistakenly attributed to catalyst deactivation is eliminated.

The invention discloses a method for detecting glucose on the basis of cascade catalysis of cerium dioxide / gold nano cluster-Prussian blue nano enzyme (AuNCs-CeO-HMPB). The material is prepared by compounding cerium dioxide (CeO) with similar glucose oxidase activity and hollow Prussian blue nanoparticles (AuNCs-HMPB) modified by gold nanoclusters with similar peroxidase activity through a hydrothermal assembly method. In the presence of glucose, CeO catalyzes oxidation of glucose to generate gluconic acid and H2O2, then AuNCs-HMPB synergistically catalyzes decomposition of newly generated H2O2 to generate high active oxygen species, further a colorless 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) color developing agent is oxidized to generate obvious color change, and based on the cascade catalytic reaction, the enzyme-free glucose colorimetric sensor is successfully constructed. The sensor shows excellent detection performance on glucose under optimized conditions (pH = 4.0, 50 DEG C), the linear detection range is 10.00-90.00 [mu] mol / L, and the detection limit is 2.1 [mu] mol / L (S / N = 3).

The invention belongs to the field of environmental protection, analysis and detection, and relates to a composite catalyst for a total organic carbon tester, and a preparation method, a use method and application thereof. The composite catalyst comprises a carrier-loaded core-shell type catalyst, wherein the core-shell type catalyst comprises a high-entropy oxide shell and a platinum nano core wrapped by the high-entropy oxide shell; the core-shell type catalyst is uniformly distributed on the carrier; the metal elements in the high-entropy oxide shell comprise four elements of Mn, Cr, Ce and Fe, and any one or more of three elements of Co, Ni and Ru. The core-shell structure protects the platinum noble metal in the inner core and enhances the stability and the core durability of the platinum noble metal, the high-entropy oxide shell effectively inhibits diffusion and phase change of crystals, enhances the thermal stability and the sintering resistance of the catalyst and improves the poisoning resistance and the corrosion resistance, and due to the synergistic effect of multiple elements, the performance is far better than that of linear superposition of a single component.

The invention relates to a diatomic catalyst for detecting carbosulfan pesticide residue and a preparation method, and belongs to the technical field of food safety detection. According to the invention, a reducing sulfide generated by breaking a nitrogen-sulfur (N-S) bond of carbosulfan under an acidic condition is used as a specific substance. The reductive sulfide not only can prevent bimetal active sites in the diatomic catalyst, but also consumes hydroxyl radicals generated by catalyzing hydrogen peroxide (H2O2), and the sensing switch enzyme formed by a dual enzyme inhibition mechanism causes the enzyme substrate 3, 4-dihydroxyl-3, 4-dione to be converted into the diatomic catalyst, so that the catalytic activity of the diatomic catalyst is improved. The blue color of the 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) gradually becomes light along with the increase of the concentration of carbosulfan, sensitive visual detection is implemented, and after a blue product is read by using an ultraviolet spectrophotometer, the absorbance value generated by an ultraviolet absorption spectrum at 654 nm is linearly dependent on carbosulfan. The prepared diatomic catalyst effectively improves the detection sensitivity of the carbosulfan pesticide residue, and has good popularization and application prospects.

The invention discloses an on-site catalyst evaluation system and method based on surface detection, and belongs to the technical field of flue gas treatment. According to the technical scheme, the field catalyst evaluation system based on surface detection comprises a gas inlet atmosphere modulation module, a reactor module, a gas detection module and a tail gas treatment module which are connected in sequence; the gas inlet atmosphere modulation module comprises a gas inlet flue, a gas inlet stop valve, a gas inlet adjusting valve, a flue gas mixer, a modulation gas pipeline, a modulation gas stop valve and a modulation gas mass flow meter; the high-density sensor array and the optical imaging unit are combined with a spatial interpolation algorithm to generate an efficiency distribution heat map, real-time monitoring of surface activity distribution of the catalyst is achieved, through parallel testing of multiple reactor components and machine learning life prediction, the evaluation precision and research and development efficiency of the catalyst are remarkably improved, and the research and development cost is lowered. The method has the advantages that the catalyst surface efficiency heterogeneity is captured in real time, multi-channel accelerated testing is supported, and the service life is accurately predicted.

The invention discloses an application of a sensing array based on an MOF-818 nano enzyme in polyphenol substance detection, and the sensing array based on the MOF-818 nano enzyme is composed of an MOF-818-1 nano enzyme prepared by a one-step solvothermal method and an MOF-818-2 nano enzyme prepared by a two-step solvothermal method, the polyphenol substance is a single polyphenol or a mixture of more than two polyphenols. The method has the advantages of high distinguishing capability, high information dimension, high detection efficiency, low detection cost, good polyphenol detection sensitivity, wide linear range (10-800 [mu] M) and reliable detection result, can be applied to analysis of actual samples such as chrysanthemum extract and the like, and has wide application prospect, and the identification capability of polyphenol with similar structures is improved. The method has the advantages of high distinguishing capability, high information dimension, high detection efficiency, low detection cost, high polyphenol detection sensitivity, wide linear range (10-800 [mu] M) and reliable detection result. And good practicability is proved.

The invention relates to the technical field of analytical chemistry and food pharmacy detection, in particular to a rutin antioxidant activity colorimetric determination method based on a composite nano enzyme, which comprises the following steps: mixing a to-be-detected sample solution with an ABTS free radical cation working solution to carry out first reaction, so that an antioxidant substance in a sample and ABTS free radical cations are subjected to scavenging reaction; adding the composite nano enzyme, a 3, 3 ', 5, 5'-tetramethyl benzidine solution and a hydrogen peroxide solution into a system after the first reaction is completed, and initiating a second reaction; and measuring the absorbance value of the system after the second reaction under a specific wavelength, comparing the absorbance value with the standard curve obtained through the treatment in the same step, and calculating the antioxidant activity expressed by the equivalent concentration of rutin in the sample to be detected. By optimizing reaction conditions, the method provided by the invention simplifies operation steps and can provide accurate measurement results in a wider concentration range.

This invention discloses an in-situ infrared characterization cell device based on electromagnetic induction technology and its application in the structural characterization of catalytic materials. The device includes a reaction tube, an electromagnetic heating system, and an infrared spectrometer. The electromagnetic heating system includes an electromagnetic induction coil, which surrounds the outside of the reaction tube. The infrared sample to be tested is placed in the reaction tube. The device adopts a transmission-type optical path mode, where infrared light emitted by the infrared spectrometer passes through the reaction tube and is collected by an infrared detector on the other side. The electromagnetic induction in-situ infrared reaction cell of this invention can explore the structure and reaction mechanism of materials in an electromagnetic induction environment, filling a technological gap in the field of electromagnetic induction in-situ infrared characterization and possessing strong practicality and promotional value.

The invention comprises a catalyst device (1) for hydrogen isotope exchange analysis, wherein the catalyst device (1) consists of a catalyst carrier (10) and a catalyst material (20) applied to a surface (12) of the carrier (10), wherein at least the carrier surface (12) consists of an inorganic material and the catalyst material is sputtered or electrodeposited on at least a part of the surface (12) of the carrier (10). The invention further pertains to a sample vessel (100) for hydrogen isotope exchange analysis, wherein the sample vessel (100) contains one or more catalyst devices (1) according to the invention, wherein a maximum outer diameter (D) of the catalyst device (1) is smaller than a minimum inner diameter (101) of an opening of the sample vessel (100) or of the sample vessel (100) itself. The invention also foresees a method of hydrogen isotope analysis employing the sample vessel (100) and the use of the catalyst device (1) in a method of hydrogen isotope analysis.

The application relates to the technical field of catalytic experiments, and particularly discloses a pre-sulfurization catalyst reaction system and a use method, which comprises a gas supply assembly, a liquid supply assembly, a preheating assembly and a catalysis assembly, the gas supply assembly is connected with a gas channel in parallel, the preheating assembly internally comprises a front-stage spiral pipe and a rear-stage spiral pipe, the width and the length of a static liquid vaporization bin are both greater than the diameter of the front-stage spiral pipe, the bottom surface of the static liquid vaporization bin is a right angle, and a dispersion guide inclined plate is arranged in the static liquid vaporization bin; the process of optimizing the heating conversion of the gas-liquid two-phase into the gas single-phase is achieved, the influence of the unvaporized liquid drops on the catalyst is avoided or reduced, and the optimized structure satisfies the backflush function. The mode satisfies the backflush application, and the discharge channel can also recycle the liquid under the condition that the liquid injection amount is too large, various factors in the whole experimental process are considered, the selection range of the experimental parameters is expanded, and the mode has high applicability to the multi-parameter comparison experiment.

The utility model discloses a humidifier and a desulfurization efficiency detection system for a dry desulfurization catalyst. The technical problems that in the prior art, the humidifying efficiency is low, and the humidifying effect is difficult to meet the requirement for extremely high humidity or low humidity are solved. The humidifier is used for humidifying gas to be desulfurized and comprises a tank body filled with water and a first heating mechanism for heating the tank body, a gas inlet and a gas outlet are formed in the tank body, the humidifier further comprises a porous filler layer, the porous filler layer is arranged below the liquid level, and the periphery of the porous filler layer is connected with the inner wall of the tank body; the atomizing mechanism is arranged above the liquid level, and the atomizing mechanism is used for atomizing water; the air inlet pipeline is connected with the air inlet and extends to the lower part of the porous filler layer, and the lower end of the air inlet pipeline is provided with air outlet holes which are arranged at intervals from top to bottom.

The invention discloses a biogas carbon sequestration hydrogen production simulation device based on biochar catalytic action and a test method. The biogas carbon sequestration hydrogen production simulation device comprises a gas preparation and conveying system, a reaction and temperature control system and a product treatment and analysis system which are connected in sequence, the gas preparation and conveying system comprises a CH4 gas cylinder, a first flow regulator and a mixed gas tank which are sequentially connected through a guide pipe, and a CO2 gas cylinder and a second flow regulator which are sequentially connected through a guide pipe and are connected with the mixed gas tank. According to the biogas carbon sequestration hydrogen production simulation device based on the biochar catalytic action and the test method, the biogas is converted into H2 and the carbon nanomaterial by utilizing a biogas chemical vapor deposition process, the H2 can be stored as clean energy, and the carbon nanomaterial is widely applied in multiple fields due to unique physical, chemical and mechanical energy, so that the biochar catalytic action-based biogas carbon sequestration hydrogen production simulation device can be widely applied to various fields. The problem of high emission of CO2 in the traditional anaerobic digestion and biogas treatment process is solved, meanwhile, carbon recycling is achieved, and high economic value is shown.

The invention provides a 24-hour urine total nitrogen automatic measuring device, which comprises an automatic urine collection module, which is used for continuously introducing urine of a patient into a disposable collection bag in a closed-loop path and homogenizing and weighing the urine in the bag; the automatic sampling module is communicated with a liquid path of the automatic urine collecting module and is used for extracting the homogenized urine in a creeping manner and injecting a sample with a fixed volume into the reaction cabin; the nitrogenous organic matter conversion and ammonia gas measurement module is hermetically connected to the downstream of the automatic sampling module and is used for completely converting a nitrogen source in the sample into ammonia gas and detecting the mass concentration of the ammonia gas in real time; the interaction and total nitrogen calculation module is in signal connection with the three modules and is used for receiving the ammonia gas mass concentration data and automatically calculating and outputting a total nitrogen result of urine by combining the ammonia gas mass concentration data with the 24-hour urine volume; the collection module, the sampling module and the conversion and measurement module are sequentially connected according to the flow direction of urine, and the interaction and total nitrogen calculation module performs cross-module control and synchronizes data to form a closed-loop full-automatic detection path.

The utility model discloses a small-scale test device for evaluating a fixed bed catalyst, which comprises a gas feeding unit, a catalytic reaction unit, a synthetic reaction unit, a product collecting unit and a product online analysis unit, materials in the gas feeding unit are synthesized through the catalytic reaction unit or the synthesis reaction unit, then effectively separated through the product collection unit and finally detected through the product online analysis unit, and the catalytic reaction unit or the synthesis reaction unit adopts a double-channel double-temperature-control mode. And transverse contrast test is realized through different reaction temperature control modes, so that a catalytic reaction and a synthetic reaction of reactants at proper temperature and pressure are ensured, and the reaction efficiency and the product quality are improved.

A device (10) for determining a density of radicals (5) of a radical type in a measuring space (4) comprisesa catalyst material (1) which can be brought into contact with the measuring space at least in the region of a first surface (15) of the catalyst material, wherein the catalyst material is suitable for triggering an exothermic recombination reaction of radicals of the radical type when radicals of the radical type come into contact with the first surface;a temperature actuator (2) in thermal contact with the first surface; anda temperature sensor (3) in thermal contact with the first surface.The device is designed to control the temperature actuator by means of a control signal in such a way that the measured value detected by the temperature sensor is kept at a setpoint value, and wherein the control signal can be evaluated in order to determine the density of radicals of the radical type in the measuring space.The invention is further directed to a method for determining a density of radicals (5) of one radical type in a measuring space.

This invention provides a method for determining the deactivation temperature and deactivation characteristics of a hydroformylation catalyst, comprising: S1. preparing a hydroformylation reaction solution; S2. measuring the reaction solution and placing it in an adiabatic testing instrument to simulate a hydroformylation reaction, stopping the heating when the temperature reaches T0 and incubating the reaction under adiabatic conditions; recording the temperature change and obtaining the highest temperature T. m S3. After cooling the test ball, remove half of the reactant material, add the hydroformylation reaction raw material, and heat up to simulate the hydroformylation reaction. When the temperature reaches T1, stop heating and perform an adiabatic reaction. Record the highest temperature T. mf S4. Compare T1 and T m and T mf If T mf =T1, catalyst deactivation temperature is T m Irreversible inactivation; if T mf =T m The catalyst deactivation temperature is T m Reversible inactivation; if T mf >T m Remove the material from the test sphere and repeat steps S2 to S4. The judgment method of this invention has a short testing cycle, high safety, and eliminates the need for sample separation and component analysis. It provides guidance for research on catalyst operating limits and the selection of homogeneous catalyst recovery temperatures.

The invention relates to an analysis method and an analysis device for the reaction performance degradation characteristic of an SCR (Selective Catalytic Reduction) denitration catalyst, and the method comprises the following steps: deducing and concluding based on the removal efficiency of NO to generate a denitration catalyst reaction performance degradation principle general formula; based on a denitration catalyst reaction performance attenuation principle general formula, analyzing denitration catalyst reaction performance attenuation characteristics including a single time node, double time nodes and multiple time nodes; and determining the residual life of the catalyst according to the reaction performance attenuation characteristics of the denitration catalyst, and generating a reaction performance attenuation curve of the denitration catalyst. Therefore, the problems that quantitative analysis under different working conditions lacks a unified basis and is difficult to adapt to complex scenes of single, double or multiple time nodes and prediction results lacks an imaging attenuation curve due to the fact that catalyst performance detection lacks a unified attenuation principle general formula and a multi-node analysis method in related technologies are solved. And the attenuation trend of the denitration efficiency or potential cannot be visually displayed.

The present invention relates to the technical field of diesel engine after-treatment, and particularly relates to a method for evaluating the catalytic performance of a denitrogenation and deoxidation system for diesel engine after-treatment, comprising the following steps: S1. Obtain n steady-state operating points of the diesel engine; S2. Operate the diesel engine at each steady-state operating point to obtain the conversion efficiency of the catalyst of the denitrogenation and deoxidation system for diesel engine after-treatment and the catalyst response time at each steady-state operating point. The present invention can comprehensively analyze the conversion efficiency and response time of the after-treatment catalyst, better evaluate the catalytic ability of the catalyst under the instantaneous operating conditions of the engine after-treatment system, and provide data support for its design, selection and optimization; moreover, the results of the steady-state point test of the present invention can be considered to have excluded the influence of other factors, and a series of after-treatment emission data can be obtained by adjusting specific engine parameters, which can assist in optimizing the calibration and optimization of engine parameters.

Provided are a composite structure, in which metal nanoparticle-perovskite oxide is bound to metal oxide supports (i.e., sensing materials), and a preparation method thereof. The composite structure has improved durability, in which metal nanoparticles uniform in size are evenly distributed on the surface of perovskite oxide. Provided is also a high-performance gas sensor having excellent target gas detection performances by including the composite structure.

The invention discloses an electrocatalyst high-throughput screening platform for an electrocatalytic reaction system and a method thereof. According to the platform, a flowing electrolytic tank and a high-flux pipetting workstation are taken as cores, and gas chromatography (GC) and nuclear magnetic resonance (NMR) rapid product analysis are integrated. The platform adopts an aluminum alloy gantry type four-axis (XYZ1Z2) moving mechanism to realize space positioning of clamping and pipetting; the high-flux pipetting workstation is provided with a gun head storage module, a reagent bottle storage module, a rotary bottle cap module and an electrocatalyst preparation module, so that accurate liquid proportioning and electrocatalyst preparation are realized; a flowing electrolytic tank and the like are arranged in the electrochemical test workstation, so that continuous flowing electrolysis, automatic sample loading and electrolyte circulation are realized; the GC / NMR module is used for rapidly detecting a product on line. The platform realizes whole-process unmanned and repeatable catalyst preparation and high-throughput screening through a unified control circuit and an upper computer. The electrocatalytic reaction system is a carbon dioxide reduction reaction system.

The invention belongs to the technical field of catalytic luminescence detection, and discloses a carbon monoxide catalytic luminescence detection method which comprises the following steps: respectively preparing alpha-Fe2O3 nanoparticles and an alpha-Fe2O3 / reduced graphene oxide composite material based on ferric chloride hexahydrate, urea, an anhydrous hydrazine solution and graphene oxide powder; respectively carrying out material characterization on the prepared alpha-Fe2O3 nanoparticles and the alpha-Fe2O3 / reduced graphene oxide composite material so as to analyze the structural performance of the alpha-Fe2O3 nanoparticles and the structural performance of the alpha-Fe2O3 / reduced graphene oxide composite material; the prepared alpha-Fe2O3 nanoparticles and the alpha-Fe2O3 / reduced graphene oxide composite material are used as catalytic luminescence gas sensitive materials, and catalytic luminescence detection is carried out on carbon monoxide under preset conditions. The response strength of the composite material to CO is improved by several times under the same condition, the response time and the recovery time can reach the second level respectively, and rapid detection in the true sense is achieved.

An integrated hydrogen sensing microsystem, a manufacturing method, and a data processing method. Belonging to the technical field of integrated hydrogen sensing microsystems. The present invention solves the problem of accurate detection of a wide range that is difficult to solve with a single principle in current hydrogen detection. The alumina ceramic substrate of the present invention is covered with a first semiconductor principle electrode, a second semiconductor principle electrode, and a catalytic principle heating sensitive electrode. The first semiconductor principle electrode is connected to a first platinum pad, and the catalytic principle heating sensitive electrode is connected to a second platinum pad and a third platinum pad. A sensitive semiconductor blackbody silicon carbide anti-infrared radiation packaging layer is formed on the first semiconductor principle electrode and the second semiconductor principle electrode by a semiconductor principle sensitive material, and a sensitive catalytic body blackbody silicon carbide anti-infrared radiation packaging layer is formed on the catalytic principle heating sensitive electrode by a catalytic principle sensitive material. The integrated hydrogen sensing microsystem, the manufacturing method, and the data processing method of the present invention realize wide-range detection of hydrogen concentration.

The invention relates to the technical field of motor vehicle tail gas after-treatment, and discloses a three-way catalyst conversion efficiency online detection method based on infrared spectroscopic analysis. The method comprises the following steps: continuously acquiring and fusing infrared spectrum and working condition data by establishing a data channel, constructing a spectral feature domain representing the intrinsic state of the catalyst, and mapping real-time data into a feature vector sequence; the state of the active site on the surface of the catalyst is estimated by analyzing sequence change, and then the real-time activity degree of each chemical reaction path is deduced. The pollutant conversion amount is distributed based on the path activeness weight, the contribution of each path is calculated, the instantaneous conversion efficiency is summarized and evaluated, and finally an activity attenuation track is drawn and a diagnosis instruction is triggered. According to the technology, transformation from macroscopic efficiency monitoring to microscopic reaction path analysis is realized, the root of efficiency reduction can be accurately positioned, and early warning is realized.

The invention provides a precious metal platinum-doped nano zinc oxide photocatalyst, a preparation method and application, and relates to the technical field of catalyst synthesis. The method specifically comprises the following steps: pretreating a natural biological material with a hierarchical porous structure as a soft template, and freeze-drying to obtain a Zn < 2 + > supported biological template; placing the template in a mixed solvent, performing microwave hydrothermal synthesis to obtain a ZnO (at) biological template, and performing centrifugal washing; preparing a doping solution containing noble metal ions, dissolving the ZnO (at) biological template in the doping solution containing noble metal ions, and irradiating under ultraviolet light; calcining in an air atmosphere, and then immersing a product into a citric acid solution to obtain the catalyst. By combining a natural biological template with microwave-assisted hydrothermal and in-situ photochemical reduction technologies, uniform doping of ultralow noble metals (Pt, Pd, Au and the like) in a ZnO hierarchical porous structure is realized, and material morphology regulation and control and active site construction are synchronously completed.

The invention discloses an in-situ monitoring method for dynamic morphology and activity of a nitrate reduction reaction catalyst, and belongs to the technical field of electro-catalytic material characterization. And in combination with a modified electrolytic tank and a linkage strategy of'potential output-morphology scanning-activity detection ', in-situ co-positioning accurate monitoring of nanoscale morphology evolution and local activity distribution on the surface of the catalyst in the nitrate radical reduction reaction process is realized, and the method has high stability and compatibility and excellent dynamic quantitative characterization capability. According to the in-situ monitoring method developed by the invention, the technical bottleneck that the morphology and the activity are difficult to synchronously monitor by a traditional characterization technology is solved, and a brand-new dynamic analysis platform is provided for dynamic identification of active sites of a nitrate reduction reaction catalyst, analysis of a reaction mechanism and optimization of catalytic performance.

A distance measuring device includes a measuring member holding a length measuring instrument and at least one rail member (base member) on which the measuring member is movably disposed. When a straight line parallel to a direction in which the measuring member disposed on the base member moves is defined as a reference line, an angle formed by a straight line parallel to an axial length direction of a reaction tube and the reference line, which are on an identical plane, is constant for the plurality of reaction tubes disposed side by side along the reference line. A measurement direction of the length measuring instrument is parallel to the axial length direction of the reaction tube in a state where the measuring member is disposed on the base member. The measuring member is disposed on the base member to be able to sequentially move.

The application provides a methanol reforming hydrogen production device test bench, and relates to the technical field of new energy sources.The methanol reforming hydrogen production device is connected with an air supply branch, a methanol water vapor supply branch, a heating branch, a reforming gas treatment branch and a temperature measurement branch.The air supply branch comprises a blower, an air flow meter and a temperature sensor 1.The methanol water vapor supply branch comprises a constant flow pump 1, a liquid flow meter 1 and a temperature sensor 2.The heating branch comprises a constant flow pump 2, a liquid flow meter 2, a temperature sensor 3 and a temperature sensor 4.The temperature measurement branch comprises a temperature sensor 5, a temperature sensor 6, a temperature sensor 7 and a temperature sensor 8.Feedback regulation is realized through the cooperation of a plurality of constant flow pumps, a plurality of liquid flow meters, a blower, an air flow meter and other controllable actuators and sensors, so that the reactant flow entering the methanol reforming hydrogen production device can be accurately controlled, and quantitative analysis on the performance of the methanol reforming hydrogen production device can be realized.