221results about "Chemical analysis using catalysis" patented technology

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 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 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.

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 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.

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 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.

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.

The application provides a detection device for isobutyraldehyde and application and a method for detecting isobutyraldehyde, relates to the technical field of isobutyraldehyde detection, and comprises an automatic sampling part, a catalytic luminescence reactor and a detection instrument; wherein the catalytic layer of the catalytic luminescence reactor comprises nano barium titanate; the detection device has sensitive response, excellent specificity and better stability to isobutyraldehyde, achieves the technical effects of good reproducibility, rapid response, rapid recovery and repeated detection in a short time, and provides guarantee for long-term online accurate detection of the isobutyraldehyde concentration.

The utility model relates to the field of denitration catalyst performance evaluation, in particular to a denitration catalyst arsenic poisoning resistance evaluation device which comprises a mixing preheater, an As2O3 steam reactor, a catalyst reactor, a flue gas analyzer and a collector, and the mixing preheater and the As2O3 steam reactor are both communicated with the front end of the catalyst reactor; the flue gas analyzer and the collector are both communicated with the tail end of the catalyst reactor. The device has high controllability, can accurately adjust and stably maintain key parameters such as arsenide concentration, temperature, humidity and the like, and can simulate complex gas components and dynamic change conditions in actual flue gas. Therefore, a more real and reliable experimental environment is provided for arsenic poisoning resistance evaluation of the catalyst, the research and development process of the efficient arsenic poisoning resistance catalyst is accelerated, and continuous progress, application and popularization of the SCR technology are promoted.

The invention discloses a high-temperature in-situ diffuse reflection infrared device applied to low-temperature plasma, and relates to the technical field of in-situ diffuse reflection infrared measurement. The ceramic cover plate is detachably arranged at the opening of the stainless steel tank body, and a sealed high-temperature accommodating cavity is formed when the ceramic cover plate covers the opening of the stainless steel tank body; the ceramic fixing flange penetrates through a bottom plate of the stainless steel tank body and is in sealed connection with the stainless steel tank body, the top of the ceramic fixing flange is located at the position, close to the center, of the high-temperature containing cavity, and a material containing space with the diameter larger than that of a through hole in the ceramic fixing flange is formed in the top of the ceramic fixing flange; the high-voltage electrode is arranged in the ceramic fixing flange in a penetrating mode, the top of the high-voltage electrode extends into the material containing space, and the top end of the high-voltage electrode is lower than the top of the ceramic fixing flange. The beneficial effects are that the central high-voltage electrode and the annular electrode are cooperatively designed, the central high-voltage electrode is used as a discharge electrode, and the glow-like discharge phenomenon is generated between the central high-voltage electrode and the annular electrode, so that a uniform discharge area is formed.

The invention relates to the field of three-way catalytic converter detection, in particular to a three-way catalytic converter conversion efficiency detection device and method.The three-way catalytic converter conversion efficiency detection device comprises a front oxygen sensor and a rear oxygen sensor which are both fixedly installed on a three-way catalytic converter shell, and the front oxygen sensor is installed on the side close to an engine; the rear oxygen sensor is installed on the side away from the engine, a supporting frame is fixedly installed on the inner wall of the three-way catalyst shell, a transmission rod is rotatably installed on the supporting frame, and one end of the transmission rod is connected with an arc-shaped rotating block. Tail gas generated by an engine is used for driving the transmission rod to rotate, the rotating transmission rod drives the arc-shaped rotating block to rotate, the rotating arc-shaped rotating block cleans the front oxygen sensor, it is avoided that deposited carbon covers the oxygen sensor to affect normal operation of the oxygen sensor, the detection accuracy of the front oxygen sensor is guaranteed, an automobile does not need to be frequently maintained, and the service life of the automobile is prolonged. And the later maintenance cost of the vehicle is greatly reduced.

The invention discloses a performance detection method for a catalytic plate of a passive hydrogen recombiner of a nuclear power plant. The performance detection method comprises the following steps: S1, building a multifunctional simulation experiment platform; s2, performing pre-experiment characterization on the catalytic plate sample to obtain pre-experiment characterization data; s3, placing the catalytic plate sample in a multifunctional simulation experiment platform, and carrying out normal operation environment simulation and serious accident environment simulation in sequence; s4, after the normal operation environment simulation is finished, taking out the catalytic plate sample, and carrying out multi-dimensional performance index detection to obtain a first-stage detection result; after the serious accident environment simulation is finished, taking out the catalytic plate sample again, and carrying out multi-dimensional performance index detection to obtain a second-stage detection result; and S5, based on a detection result, carrying out comprehensive performance evaluation on the catalytic plate sample. According to the invention, the whole life cycle complex service environment of the catalytic plate can be comprehensively simulated, the accident emergency capability and long-term durability of the catalytic plate are verified, and more reliable equipment performance guarantee is provided for safe operation of a nuclear power plant.

This invention primarily relates to the field of ammonia cracking reaction technology. It discloses an ammonia cracking reaction testing system, comprising a temperature control module, an ammonia supply module, an ammonia cracking reaction module, and an analysis module. The temperature control module controls the target temperature for the ammonia cracking reaction. The ammonia cracking reaction module is used to crack the ammonia gas supplied by the ammonia supply module at the target temperature to obtain a mixed gas. The analysis module is used to analyze the composition of the mixed gas and obtain ammonia cracking reaction test data. This application enables detailed testing and analysis of the performance and stability of ammonia cracking reaction devices and catalysts, thereby generating a large amount of low-cost ammonia cracking experimental data.

The utility model discloses a combustible gas detection device and relates to the technical field of detection devices. The device comprises a detector, the rear side of the detector is fixedly connected with a rectangular protective shell, and the device further comprises an adjusting part which is installed on the detector; the self-locking part is arranged in the rectangular protective shell; the adjusting part comprises an adjusting assembly, and the adjusting assembly is arranged on the detector; the guide assembly is mounted in the rectangular protective shell; the adjusting assembly comprises two hinge rods arranged in the rectangular protective shell, and a hinge shaft penetrates through the two hinge rods. By arranging the adjusting part, the gas detection device solves the problems that when an existing gas detection device is used, the distance between holding plates is inconvenient to adjust, the gas detection device is difficult to adapt to the size difference of palms of a plurality of persons, the universality and the comfort degree of equipment holding are reduced, the hand fatigue of workers due to long-time holding is increased, and the working efficiency is improved. And the efficiency and the accuracy of the detection work are influenced.

A CO2 catalytic conversion life support verification system, including gas pressure regulating module, catalytic reaction module, online detection module, direct current secondary conversion power supply, control module and structure module. The present application adopts modular assembly design, and controllably converts carbon dioxide into oxygen and carbon-containing fuel, can realize wide range, high precision independent continuous regulation of gas and liquid flow in space unmanned environment, through the catalytic reaction module, the product gas and liquid can be separated, collected, and through the online monitoring module, the high precision real-time online measurement and analysis of the tested device and the reaction product are realized. The present application can realize high efficient energy conversion efficiency, through gas driven liquid, realizes high precision control of liquid, and has small size, high sensitivity detection capacity.

The present invention further relates to a method for determining the density of radicals of a radical type in a measurement space, the method comprising: a catalytic material (1) that can be brought into contact with the measurement space at least in the region of a first surface (15) of the catalytic material, the catalytic material being suitable for causing an exothermic recombination reaction of radicals of a radical type when the radicals of the radical type are in contact with the first surface; a temperature actuator (2) in thermal contact with the first surface; and a temperature sensor (3) in thermal contact with the first surface, the device being designed to control the temperature actuator by a control signal such that a measured value detected by the temperature sensor is kept at a set value, the control signal being capable of being evaluated to determine the density of radicals of a radical type in the measurement space. The present invention further relates to a method for determining the density of radicals of a radical type in a measurement space.

The invention provides a residual oil hydrocracking conversion degree evaluation method, which comprises: 1, determining the content of a characteristic compound in an aromatic hydrocarbon component in a residual oil raw material, and recording the content as D; 2, carrying out a hydrocracking reaction on the residual oil raw material to obtain a hydrocracking liquid product, determining the content of the characteristic compound in the aromatic hydrocarbon component in the hydrocracking liquid product by using the same method as the step 1, and recording the content as E; 3, the residual oil hydrocracking conversion degree is determined according to the E / D value, and the larger the E / D value is, the higher the residual oil hydrocracking conversion degree is; wherein the characteristic compounds are benzene, naphthalene, phenanthrene, dibenzothiophene and alkyl substitutes thereof. The selected characteristic compound has good representativeness, the chromatographic analysis result of the characteristic compound is easy to identify and process, the proposed parameters and the conversion degree of the residual oil have good relevance, and the method has good operability.