Method and system for testing dynamic oxygen storage capacity of three-way catalyst

Abstract

The invention provides a method and system for testing the dynamic oxygen storage capacity of a three-way catalyst, and the method comprises the steps: sample preparation: weighing a catalyst sample, measuring and calculating the volume of the catalyst sample, and placing the catalyst sample in a high-temperature reaction furnace; calibration of the mass spectrum analyzer: calibrating the measuring ranges of O2 and CO2, wherein the calibration concentration is not lower than 6 calibration points from high to low; sample pretreatment: controlling the oxidizing atmosphere condition in the high-temperature reaction furnace, and controlling the temperature in the high-temperature reaction furnace to rise from room temperature to test temperature; dynamic oxygen storage capacity testing: controlling a CO-based reducing atmosphere and an O2-based oxidizing atmosphere in the gas distribution device to be alternately introduced into the high-temperature reaction furnace, enabling the catalyst sample to be subjected to oxygen storage and oxygen release reactions, and obtaining a stable CO2 pulse peak through a mass spectrum analyzer; oxygen storage capacity calculation: calculating the dynamic oxygen storage capacity of the catalyst according to the CO2 pulse peak; according to the method, the dynamic oxygen storage capacities of different three-way catalysts are obviously distinguished, and the method is a good method for early-stage development and screening of the catalysts.

Description

Technical Field

[0001] The invention relates to the technical field of catalysts, and in particular to a method and system for testing the dynamic oxygen storage capacity of a three-way catalyst. Background Art

[0002] In application, the three-way catalyst requires extremely strong dynamic oxygen storage and release capabilities to cope with instantaneous changes in working conditions, so as to ensure the ability to eliminate pollutants such as CO, HC and NOx. At present, the test of the oxygen storage capacity of the three-way catalyst mainly starts from the raw materials of the catalyst. One is through H2-TPR (programmed temperature rise); the other is to use the H2-O2 titration method. However, there is still a big difference between the oxygen storage performance of the raw materials and the oxygen storage performance of the finished three-way catalyst, especially for the dynamic oxygen storage capacity of the catalyst cannot be intuitively expressed.

[0003] Therefore, there is an urgent need to develop a method for testing the dynamic oxygen storage capacity of three-way catalysts. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method for testing the dynamic oxygen storage capacity of a three-way catalyst, so as to solve the problems of the dynamic oxygen storage capacity testing of a three-way catalyst in the prior art.

[0005] To achieve the above object and other related objects, the present invention provides a method for testing the dynamic oxygen storage capacity of a three-way catalyst, comprising the following steps:

[0006] S1. Sample preparation: weigh the catalyst sample, measure and calculate the volume of the catalyst sample, and place the catalyst sample in a high-temperature reaction furnace;

[0007] S2. Calibration of mass spectrometer: calibrate the range of O2 and CO2, and the calibration concentration should be no less than 6 calibration points from high to low;

[0008] S3, sample pretreatment: control the oxidizing atmosphere conditions in the high temperature reaction furnace, and control the temperature in the high temperature reaction furnace to rise from room temperature to the test temperature;

[0009] S4. Dynamic oxygen storage test: Control the reducing atmosphere dominated by CO and the oxidizing atmosphere dominated by O2 in the gas distribution device to be alternately introduced into the high-temperature reactor, so that oxygen storage and release reactions occur in the catalyst sample, and a stable CO2 pulse peak is obtained through a mass spectrometer;

[0010] S5. Calculation of dynamic oxygen storage: Calculate the dynamic oxygen storage of the catalyst based on the CO2 pulse peak. The dynamic oxygen storage calculation formula is as follows:

[0011] DOSC cat =(SV*A*Mo) / V 标准 ; Unit: mg[O] / L cat;

[0012] In the above formula, A is the average area of ​​CO2 pulse peak, unit is s; V 标准 is the standard molar gas volume, 22.4L / mol; M O : molar mass of O atoms, 16 g / mol; SV: space velocity, unit h -1 .

[0013] The present invention also provides a three-way catalyst dynamic oxygen storage capacity test system, comprising a gas distribution device, a high-temperature reaction furnace and a mass spectrometer connected in sequence, and also comprising a control device;

[0014] The gas distribution device is used to provide reducing atmosphere and oxidizing atmosphere for the catalyst sample;

[0015] The high temperature reaction furnace is used to provide a place for oxygen storage and oxygen release reaction for the catalyst sample;

[0016] The mass spectrometer is used to obtain a stable CO2 pulse peak;

[0017] The control device includes a regulating module and a calculating module.

[0018] The regulating module is used to calibrate the range of O2 and CO2 of the mass spectrometer so that the calibration concentration is not less than 6 calibration points from high to low; it is also used to control the oxidizing atmosphere conditions in the high-temperature reaction furnace and control the temperature in the high-temperature reaction furnace to rise from room temperature to the test temperature; it is also used to control the reducing atmosphere and the oxidizing atmosphere in the gas distribution device to be alternately introduced into the high-temperature reaction furnace, and based on the oxygen storage and oxygen release reactions occurring in the catalyst sample in the high-temperature reaction furnace, control the mass spectrometer to obtain a stable CO2 pulse peak;

[0019] The calculation module is used to calculate the dynamic oxygen storage capacity of the catalyst according to the CO2 pulse peak.

[0020] The present invention also provides a computer-readable storage medium storing a computer program, which implements steps S2 to S5 in the above-mentioned test method when the computer program is executed.

[0021] The present invention also provides a three-way catalyst dynamic oxygen storage capacity test terminal, comprising a memory and a processor, wherein the memory comprises a computer program, and when the computer program is run by the processor, the method of steps S2 to S5 in the above-mentioned test method is executed.

[0022] The present invention further provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method of steps S2 to S5 in the above-mentioned test method is implemented.

[0023] As described above, the method and system for testing the dynamic oxygen storage capacity of a three-way catalyst of the present invention have the following beneficial effects:

[0024] The dynamic oxygen storage capacity testing method for the three-way catalyst of the present invention generates CO2 according to the reaction of reducing atmosphere with stored oxygen, and calculates the dynamic oxygen storage capacity according to the CO2 peak area. The process is processed by computer software, which can reduce errors and has obvious distinctions between the dynamic oxygen storage capacities of different three-way catalysts. It is a good method for the early development and screening of catalysts.

[0025] The three-way catalyst dynamic oxygen storage capacity testing system of the present invention is easy to operate, low in cost, and has a high degree of differentiation in test results, which is beneficial to the development and screening of early catalysts. The present invention calculates the dynamic oxygen storage capacity based on the CO2 peak area, and the process data is processed by Origin software, thereby reducing human calculation errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic flow chart of the method for testing the dynamic oxygen storage capacity of a three-way catalyst of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the three-way catalyst dynamic oxygen storage capacity testing system of the present invention.

[0028] Figure 3 The following is a curve chart showing the dynamic oxygen storage test results for Examples 1 and 2. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, it should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; and, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0032] Please refer to the attached drawings. It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0033] like Figure 1 As shown, the first aspect of the present invention provides a method for testing the dynamic oxygen storage capacity of a three-way catalyst, comprising the following steps:

[0034] S1. Sample preparation: weigh the catalyst sample, measure and calculate the volume of the catalyst sample, and place the catalyst sample in a high-temperature reaction furnace;

[0035] S2. Calibration of mass spectrometer: calibrate the range of O2 and CO2, and the calibration concentration should be no less than 6 calibration points from high to low;

[0036] S3, sample pretreatment: control the oxidizing atmosphere conditions in the high temperature reaction furnace, and control the temperature in the high temperature reaction furnace to rise from room temperature to the test temperature;

[0037] S4. Dynamic oxygen storage capacity test: Control the reducing atmosphere dominated by CO and the oxidizing atmosphere dominated by O2 in the gas distribution device to be alternately introduced into the high-temperature reactor, so that oxygen storage and oxygen release reactions occur in the catalyst sample, and based on the oxygen storage and oxygen release reactions occurring in the catalyst sample in the high-temperature reactor, a stable CO2 pulse peak is obtained through a mass spectrometer;

[0038] S5. Calculation of dynamic oxygen storage: Calculate the dynamic oxygen storage of the catalyst based on the CO2 pulse peak. The dynamic oxygen storage calculation formula is as follows:

[0039] DOSC cat =(SV*A*Mo) / V 标准 ; Unit: mg[O] / L cat ;

[0040] Where SV = V 气体 / V cat , namely DOSC cat =((A*V气体 ) / V 标准 )*Mo / V cat =(A*V 气体 *Mo) / (V 标准 *V cat )=(SV*A*Mo) / V 标准 , unit: mg[O] / L cat ;

[0041] In the above formula, A is the average area of ​​CO2 pulse peak, unit is s; V 气体 is the total gas flow rate passing through the catalyst, in L / min; V 标准 is the standard molar gas volume, 22.4L / mol; V cat is the volume of the catalyst, in L; M O : molar mass of O atoms, 16 g / mol; SV: space velocity, unit h -1 .

[0042] In the dynamic oxygen storage capacity test method of the three-way catalyst of the present invention, reducing atmosphere and oxidizing atmosphere are alternately introduced into the catalyst at a certain frequency to realize the oxygen storage and oxygen release process of the three-way catalyst. When the gas is an oxidizing atmosphere, the catalyst absorbs and stores oxygen; when the gas is switched to a reducing atmosphere, the oxygen stored in the catalyst reacts with CO to generate CO2, as shown in reaction formula 1: 2CO+O2=2CO2(1). According to reaction formula 1, the amount of generated CO2 can be calculated to obtain the dynamic oxygen storage capacity of the catalyst at that temperature.

[0043] In some embodiments of the present invention, the sample described in step S1 is cylindrical. Specifically, a small cylindrical sample can be drilled from the finished catalyst using a professional sampler, and the height and diameter of the sample taken are measured accurately by a vernier caliper, and the number of measurements is not less than 3 times, and the average value after multiple measurements is taken, accurate to 0.1 mm. The volume of the sample is calculated according to the cylindrical volume formula, in units of L.

[0044] The bottom diameter of the cylinder is 25-26 mm, for example, 25-25.1 mm, 25.1-25.2 mm, 25.2-25.3 mm, 25.3-25.4 mm, 25.4-25.5 mm, 25.5-25.6 mm, 25.6-25.7 mm, 25.7-25.8 mm, 25.8-25.9 mm or 25.9-29 mm.

[0045] The height of the cylinder is 40-80 mm, for example, 40-50 mm, 50-60 mm, 60-70 mm, 70-76.1 mm, 76.1-76.2 mm or 76.2-80 mm.

[0046] In some embodiments of the present invention, the heating rate in step S3 is 10-30°C / min. For example, 10-15°C / min, 15-20°C / min, 20-25°C / min or 25-30°C / min.

[0047] In some embodiments of the present invention, the test temperature in step S3 is 300-600° C. For example, 300-350° C., 350-400° C., 400-450° C., 450-500° C., 500-550° C. or 550-600° C. In a preferred embodiment of the present invention, the isothermal interval test is performed with an interval temperature of 50° C.

[0048] In some embodiments of the present invention, the oxidizing atmosphere in step S3 and the oxidizing atmosphere in step S4 are both 1-4% O2+N2 (balance gas). For example, 1-2% O2+N2, 2-3% O2+N2 or 3-4% O2+N2. In a preferred embodiment of the present invention, the oxidizing atmosphere is 1% O2+N2 (balance gas).

[0049] In some embodiments of the present invention, the CO-based reducing atmosphere in step S4 is 0.5-2% CO+N2 (balance gas). For example, 0.5-1% CO+N2, 1-1.5% CO+N2 or 1.5-2% CO+N2. In a preferred embodiment of the present invention, the oxidizing atmosphere is 0.5% CO+N2 (balance gas).

[0050] In some embodiments of the present invention, the CO-based reducing atmosphere and the O2-based oxidizing atmosphere are alternately introduced into the high-temperature reaction furnace in step S4 for an alternating time of 10 to 20 seconds, for example, 10 to 12 seconds, 12 to 14 seconds, 14 to 16 seconds, 16 to 18 seconds or 18 to 20 seconds.

[0051] Step S4 specifically includes: setting the alternating time of the oxidizing atmosphere and the reducing atmosphere to 10 to 20 seconds, so that the reducing atmosphere and the oxidizing atmosphere are alternately introduced into the catalyst sample, and when the mass spectrometer collects a stable CO2 peak (≥10 CO2 pulse peaks), taking the integrated average data of all CO2 pulse peak areas.

[0052] The CO2 pulse peak data is integrated by Origin software, and the average value A of all peak areas is calculated. The calculation process is as follows: click Analysis-Math-Integrate, then select the area, and then click OK to obtain the area value, which is the peak area of ​​CO2.

[0053] like Figure 2 As shown, the second aspect of the present invention provides a three-way catalyst dynamic oxygen storage capacity test system, comprising a gas distribution device, a high temperature reaction furnace and a mass spectrometer connected in sequence, and also comprising a control device;

[0054] The gas distribution device is used to provide reducing atmosphere and oxidizing atmosphere for the catalyst sample;

[0055] The high temperature reaction furnace is used to provide a place for oxygen storage and oxygen release reaction for the catalyst sample;

[0056] The mass spectrometer is used to obtain a stable CO2 pulse peak;

[0057] The control device includes a regulating module and a calculating module.

[0058] The regulating module is used to calibrate the range of O2 and CO2 of the mass spectrometer, so that the calibration concentration is not less than 6 calibration points from high to low; it is also used to control the oxidizing atmosphere conditions in the high-temperature reaction furnace, and control the temperature in the high-temperature reaction furnace to rise from room temperature to the test temperature; it is also used to control the reducing atmosphere and the oxidizing atmosphere in the gas distribution device to be alternately introduced into the high-temperature reaction furnace, and control the mass spectrometer to obtain a stable CO2 pulse peak;

[0059] The calculation module is used to calculate the dynamic oxygen storage capacity of the catalyst according to the CO2 pulse peak.

[0060] It should be noted that it should be understood that the division of the various modules in the control device embodiment is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or physically separated. Moreover, these modules can be all implemented in the form of software calling through processing elements; they can also be all implemented in the form of hardware; some modules can also be implemented in the form of software calling through processing elements, and some modules can be implemented in the form of hardware.

[0061] For example, each module may be one or more integrated circuits configured to implement the above method, such as: one or more application specific integrated circuits (ASIC), or one or more digital signal processors (DSP), or one or more field programmable gate arrays (FPGA). For another example, when a module above is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0062] A third aspect of the present invention provides a computer-readable storage medium storing a computer program, which implements steps S2 to S5 in the above-mentioned test method when the computer program is executed.

[0063] Optionally, the computer-readable storage medium may include, but is not limited to, a floppy disk, an optical disk, a CD-ROM (Compact Disc Read Only Memory), a magneto-optical disk, a ROM (Read Only Memory), a RAM (Random Access Memory), an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory), a magnetic card or an optical card, a flash memory, or other types of media / machine-readable media suitable for storing machine-executable instructions. The computer-readable storage medium may be a product that is not connected to a computer device, or may be a component that is connected to a computer device for use.

[0064] A fourth aspect of the present invention provides a three-way catalyst dynamic oxygen storage capacity test terminal, comprising a memory and a processor, wherein the memory comprises a computer program, and when the computer program is run by the processor, the method of steps S2 to S5 in the above-mentioned test method is executed.

[0065] Optionally, the number of the memories may be one or more, and the number of the processors may be one or more.

[0066] Optionally, the processor in the three-way catalyst dynamic oxygen storage capacity test terminal will be as follows: Figure 1 In steps S2 to S5, one or more instructions corresponding to the process of the application are loaded into the memory, and the processor runs the application stored in the first memory, thereby achieving the following Figure 1 Various functions of steps S2 to S5 in the detection method.

[0067] Optionally, the memory may include but is not limited to high-speed random access memory and non-volatile memory. For example, one or more disk storage devices, flash memory devices or other non-volatile solid-state storage devices; the processor may include but is not limited to a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0068] Optionally, the processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0069] A fifth aspect of the present invention provides a computer program product, comprising a computer program, which, when executed by a processor, implements steps S2 to S5 in the above-mentioned test method.

[0070] Example 1

[0071] S1. After taking sample 1 (Gotekat, 2450) using a sampling and punching mechanism, use a vernier caliper to measure the length and diameter of the sample, measure three times each and take the average value with an accuracy of 0.1 mm. The sample size is 25.1 mm (bottom diameter) * 76.2 mm (height). Calculate the sample volume Vcat = 0.0377 L based on the measured value. Place the catalyst sample in a high-temperature reactor and check the airtightness.

[0072] S2. According to the instrument operating manual, calibrate the O2 and CO2 ranges of the mass spectrometer, and the calibration concentration should be no less than 6 calibration points from high to low; O2 concentration calibration points, 0%, 0.1%, 0.2%, 0.4%, 0.8%, 1%; CO2 concentration calibration points, 0%, 0.05%, 0.1%, 0.25%, 0.5%, 1%.

[0073] S3. First, the temperature is raised from room temperature to the test temperature of 500°C at a heating rate of 20°C / min in an oxidizing atmosphere.

[0074] S4. After the pretreatment is completed, the gas distribution device is controlled to make the oxidizing atmosphere (1% O2 / N2) and the reducing atmosphere (0.5% CO / N2) oscillate and circulate in the high-temperature reaction furnace at an air velocity of 40,000 h -1 The atmosphere switching frequency is 0.05Hz (20s), and the test ends after collecting 10 cycles. Figure 3 shown.

[0075] S5, the atmosphere switching test is 10 times, the switching interval is 20s, the average value of the CO2 peak area A is 5.47, according to the formula DOSCcat =(SV*A*Mo) / V 标准 =((40000 / 3600)*5.47*16 / 22.4 / 100)*1000=434.13mg[O] / L cat ; Calculated dynamic oxygen storage: 434.13mg[O] / L cat .

[0076] Example 2

[0077] S1. After taking sample 2 (Gotekat, 2440) using a sampling and punching mechanism, use a vernier caliper to measure the length and diameter of the sample, measure three times each and take the average value with an accuracy of 0.1 mm. The sample size is 25.3 mm (bottom diameter) * 76.1 mm (height). The sample volume Vcat = 0.0383 L is calculated based on the measured value. The catalyst sample is placed in a high-temperature reactor and the airtightness is checked.

[0078] S2. According to the instrument operating manual, calibrate the O2 and CO2 ranges of the mass spectrometer. The calibration concentration should be no less than 6 calibration points from high to low. The O2 concentration calibration points are 0%, 0.1%, 0.2%, 0.4%, 0.8%, and 1%; the CO2 concentration calibration points are 0%, 0.05%, 0.1%, 0.25%, 0.5%, and 1%.

[0079] S3. First, the temperature is raised from room temperature to the test temperature of 500°C at a heating rate of 20°C / min in an oxidizing atmosphere.

[0080] S4. After the pretreatment is completed, the gas distribution device is controlled to make the oxidizing atmosphere (1% O2 / N2) and the reducing atmosphere (0.5% CO / N2) oscillate and circulate in the high-temperature reaction furnace at an air velocity of 40,000 h -1 The atmosphere switching frequency is 0.05Hz (20s), and the test ends after collecting 10 cycles. Figure 3 shown.

[0081] S5, the atmosphere switching test is 10 times, the switching interval is 20s, the average value of the CO2 peak area A is 4.70, according to the formula DOSC cat =(SV*A*Mo) / V 标准 =373.33mg[O] / L cat ;

[0082] Calculated dynamic oxygen storage: 373.33 mg [O] / L cat .

[0083] In summary, the method for testing the dynamic oxygen storage capacity of a three-way catalyst of the present invention has obvious differentiation for the dynamic oxygen storage capacity of different three-way catalysts, and is a very good method for the early development and screening of catalysts.

[0084] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for testing the dynamic oxygen storage capacity of a three-way catalyst, characterized in that: The following steps are involved: S1. Sample preparation: weigh the catalyst sample, measure and calculate the volume of the catalyst sample, and place the catalyst sample in a high-temperature reaction furnace; S2. Calibration of mass spectrometer: calibrate the range of O2 and CO2, and the calibration concentration should be no less than 6 calibration points from high to low; S3, sample pretreatment: control the oxidizing atmosphere conditions in the high temperature reaction furnace, and control the temperature in the high temperature reaction furnace to rise from room temperature to the test temperature; S4. Dynamic oxygen storage test: Control the reducing atmosphere dominated by CO and the oxidizing atmosphere dominated by O2 in the gas distribution device to be alternately introduced into the high-temperature reactor, so that oxygen storage and release reactions occur in the catalyst sample, and a stable CO2 pulse peak is obtained through a mass spectrometer; S5. Calculation of dynamic oxygen storage: Calculate the dynamic oxygen storage of the catalyst based on the CO2 pulse peak. The dynamic oxygen storage calculation formula is as follows: DOSC cat =(SV*A*Mo) / V 标准 ; Unit: mg[O] / L cat ; In the above formula, A is the average area of ​​CO2 pulse peak, unit is s; V 标准 is the standard molar gas volume, 22.4 L / mol; M O : molar mass of O atoms, 16 g / mol; SV: space velocity, unit h -1 .

2. The method for testing the dynamic oxygen storage capacity of a three-way catalyst according to claim 1, characterized in that: The sample in step S1 is cylindrical.

3. The method for testing the dynamic oxygen storage capacity of a three-way catalyst according to claim 1, characterized in that: The heating rate in step S3 is 10-30°C / min; And / or, the test temperature in step S3 is 300-600°C.

4. The method for testing the dynamic oxygen storage capacity of a three-way catalyst according to claim 1, characterized in that: The oxidizing atmosphere in step S3 and the oxidizing atmosphere in step S4 are both 1-4% O2+N2.

5. The method for testing the dynamic oxygen storage capacity of a three-way catalyst according to claim 1, characterized in that: The CO-based reducing atmosphere in step S4 is 0.5-2% CO+N2.

6. The method for testing the dynamic oxygen storage capacity of a three-way catalyst according to claim 1, characterized in that: In step S4, the CO-based reducing atmosphere and the O2-based oxidizing atmosphere are alternately introduced into the high-temperature reaction furnace for an alternating time of 10 to 20 seconds.

7. A three-way catalyst dynamic oxygen storage capacity test system, characterized in that: It includes a gas distribution device, a high temperature reaction furnace and a mass spectrometer connected in sequence, and also includes a control device; The gas distribution device is used to provide reducing atmosphere and oxidizing atmosphere for the catalyst sample; The high temperature reaction furnace is used to provide a place for oxygen storage and oxygen release reaction for the catalyst sample; The mass spectrometer is used to obtain a stable CO2 pulse peak; The control device includes a regulating module and a calculating module. The regulating module is used to calibrate the range of O2 and CO2 of the mass spectrometer so that the calibration concentration is not less than 6 calibration points from high to low; it is also used to control the oxidizing atmosphere conditions in the high-temperature reaction furnace and control the temperature in the high-temperature reaction furnace to rise from room temperature to the test temperature; it is also used to control the reducing atmosphere and the oxidizing atmosphere in the gas distribution device to be alternately introduced into the high-temperature reaction furnace, and based on the oxygen storage and oxygen release reactions occurring in the catalyst sample in the high-temperature reaction furnace, control the mass spectrometer to obtain a stable CO2 pulse peak; The calculation module is used to calculate the dynamic oxygen storage capacity of the catalyst according to the CO2 pulse peak.

8. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is run, the method of steps S2 to S5 in the test method according to any one of claims 1 to 6 is implemented.

9. A three-way catalyst dynamic oxygen storage capacity test terminal, comprising a memory and a processor, wherein the memory comprises a computer program, characterized in that: When the computer program is executed by a processor, steps S2 to S5 of the testing method according to any one of claims 1 to 6 are executed.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method of steps S2 to S5 in the testing method according to any one of claims 1 to 6 is implemented.

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