Catalyst experiment system and experiment method

Abstract

The invention relates to the technical field of catalyst experiments, and particularly discloses a catalyst experiment system and an experiment method.The catalyst experiment system comprises a catalytic treatment module, the catalytic treatment module is provided with at least two catalytic units which are connected in series through gas paths, and the interior of each catalytic unit is detachably connected with filler of the same mass and multiple specifications; at least two specifications of catalyst fillers are arranged in the same-mass multi-specification filler, the catalyst specifications comprise volume and type, and a gas detection module is used for collecting the concentration of gas discharged from the tail end of the catalytic unit and transmitting data to the interior of a data processing module; according to the system, series-connection same-mass multi-specification catalysts are selected for concerted catalysis, original gas with the concentration not lower than the maximum concentration of the catalysts is injected, the gradient type concerted treatment effect of various mixed catalysts is generated along with reduction of the concentration after treatment, and a brand new mixed catalysis scheme is obtained according to the subsequently judged carbon deposition effect; and the performance of the catalyst is diversified.

Description

Technical Field

[0001] The present invention relates to the technical field of catalyst experiments, in particular to a catalyst experiment system and an experiment method. Background Art

[0002] Mordenite molecular sieve is also known as MOR, please refer to Figure 2 The MOR backbone consists of a 12-membered ring channel and an 8-membered ring channel. The Bronsted acid sites on the 8-membered ring channel are active sites for dimethyl etherification, and their confinement effect contributes to the selective formation of the target product, methyl acetate. However, the Bronsted acid sites on the 12-membered ring channel contribute to carbon deposition, as the rate of carbon deposition increases in direct proportion to the deactivation rate of the molecular sieve.

[0003] Carbon deposits primarily originate from activated dimethyl ether (DME) or methyl acetate (MA) molecules during the MOR-catalyzed DME carbonylation reaction. Therefore, carbon deposits are partially due to the DME concentration in the feed gas. Furthermore, higher CO concentrations increase the rate of methyl acetate formation, accelerating carbon deposit formation and increasing the deactivation rate of MOR.

[0004] The Bronsted acid sites within the 12-membered ring pore of MOR are currently being optimized. For example, efforts are underway to modify the active site and reduce the number of Bronsted acid sites within the 12-membered ring pore using pyridine adsorption, thereby reducing activity and increasing service life. Consequently, new and improved MORs are constantly being developed for market selection.

[0005] The Dalian Institute of Chemical Physics has completed long-term experiments and regeneration performance tests on dimethyl ether carbonylation and methyl acetate hydrogenation catalysts. The dimethyl ether carbonylation catalyst uses mordenite molecular sieve, with a catalyst life of 4,000-6,000 hours. This demonstrates the catalyst's long lifespan.

[0006] To summarize, before a catalyst can be used, carbon deposition and deactivation must first be considered. Secondly, the catalyst's concentration ratio relative to the dimethyl ether and carbon monoxide in the feed gas must be considered. Finally, to minimize losses from repeated use, catalyst particle size must be considered. If experiments were conducted using existing feed gas ratio parameters, the existing feed gas ratio would have been sufficient to achieve a catalyst lifespan of over 4,000 hours. This would result in excessively long catalyst testing cycles, making it impossible to generate a large number of test samples due to aging, resulting in suboptimal compatibility and unsuitability for the current market environment where modified MOR products are frequently appearing. Summary of the Invention

[0007] The purpose of the present invention is to provide a catalyst experimental system and experimental method. The system selects multiple specifications of catalysts of the same mass to be connected in series for synergistic catalysis, and starts to inject the original gas with a concentration not lower than the maximum concentration of the catalyst. As the concentration decreases after treatment, a gradient synergistic treatment effect of multiple types of mixed catalysts is produced. With the high-concentration catalytic effect as the critical point, multiple types of catalysts are comprehensively evaluated and independently classified and analyzed for temperature rise. In the series connection process, no waste of filtered gas is generated, thereby generating a new coordination method, and a new mixed catalytic scheme is obtained based on the carbon deposition effect judged subsequently, so that the performance of the catalyst is diversified, thereby improving the economy of the catalyst, and the combined use of the catalyst has a positive effect on the coupling of the catalyst and the production line to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: A catalyst experimental system includes a catalytic treatment module, wherein the catalytic treatment module has at least two catalytic units with gas paths connected in series, each catalytic unit is detachably connected to a packing of multiple specifications of the same mass, wherein the packing of the multiple specifications of the same mass has at least two specifications of catalyst packing, wherein the catalyst specifications include volume and type, and further includes: A gas detection module collects the gas concentration emitted from the end of the catalytic unit and transmits the data to the data processing module; an air supply module connected between an air source and an air inlet of the catalytic unit, wherein the data processing module regulates the concentration and flow rate of carbon monoxide and dimethyl ether in the gas entering the catalytic unit through the air supply module, and the intake air concentration of the catalytic unit gradually decreases according to the series gas flow sequence; The TPO module is used to classify and independently analyze the catalysts in the same mass and multi-specification fillers according to particle size, and to heat the catalysts to 200°C-300°C through the initial temperature-raising and reduction unit, to 300°C-400°C through the middle temperature-raising and reduction unit, and to 400°C-600°C through the terminal temperature-raising and reduction unit to collect test samples.

[0009] As a further solution of the present invention: the catalytic unit at the end is provided with an exhaust pipeline, and a series gas path is provided between two adjacent catalytic units. The number of the gas detection module is 1, and the air inlet end of the gas detection module is respectively connected to the series gas path and the exhaust pipeline.

[0010] As a further solution of the present invention: the gas source includes original gas and supplementary gas, the original gas enters through the catalytic unit at the front end of the airflow movement direction, the supplementary gas is arranged in the series gas path, and the data processing module controls the supplementary gas concentration and supplementary gas flow rate according to the gas parameters in the series gas path collected by the gas detection module.

[0011] As a further solution of the present invention: during the circulation experiment, the initial temperature rising reduction unit independently treats the catalyst, the middle temperature rising reduction unit and the terminal temperature rising reduction unit stop operating, and the treated catalyst continues to be filled into the multi-specification fillers of the same mass and continues to be used, and is detected by the gas detection module, and finally the data processing module processes the data of the gas detection module to obtain the difference in the gas treatment effect of the secondary use of the catalyst.

[0012] As a further solution of the present invention: the mass change of the reduced catalyst after being treated by the initial temperature reduction unit is obtained by a weighing module, and the data processing module combines the parameters of the weighing module and the gas detection module to analyze the use effect of the catalyst.

[0013] As a further solution of the present invention: the catalytic treatment module independently controls the reaction environment inside the catalytic unit, and the reaction environment includes temperature, pressure, and gas time-space velocity.

[0014] As a further solution of the present invention: comprising the following steps: Step 1: Select multiple types of catalysts with the same particle size and stack them evenly or in layers in a packing of multiple specifications with the same mass. Zone the catalysts according to the maximum and minimum intake air concentrations specified in their specifications. Select multiple catalytic units based on the area range and connect them in series. Place the loaded packing of multiple specifications with the same mass into the catalytic units. Step 2: The gas supply module injects the raw gas with a concentration not less than the maximum intake concentration into the catalytic unit. The concentration of the gas after being processed by the catalytic unit is collected by the gas detection module. The residual gas is transported to the subsequent catalytic unit by pressurized transportation, and the gas with a concentration corresponding to the detection result of the gas detection module is replenished by the supplementary gas. Step 3: When the gas detection module detects that the intake air concentration of the catalytic unit is lower than the required concentration or the set concentration, the gas supply module adjusts the supplementary gas concentration; Step 4: The gas detection module collects the highest concentration of gas. After the gas concentration changes after passing through the catalytic unit and shows a continuous increase, the catalysis stops; Step 5: After taking out the same mass and multiple specifications of fillers and sorting them by type, they are processed through the TPO module. The initial temperature reduction unit heats the catalyst to 300°C, and the catalyst mass change and the release concentrations of dimethyl ether and methyl acetate are detected. Steps 1 to 3 are repeated, and the catalyst mass loss, carbon deposition amount, and the release concentrations of dimethyl ether and methyl acetate are compared multiple times to determine the optimal one. Step 6: After step 4, the catalyst is treated by a middle temperature reduction unit and a terminal temperature reduction unit, and the amount of carbon deposits is determined based on the H2O and CO2 reaction peaks.

[0015] Step 7: Obtain the corresponding intake concentration parameters for the single-category catalyst optimized in step 6. Further divide the optimal intake concentration parameters into multiple intervals through step 1, and load catalysts of various particle sizes for secondary experiments to determine the optimal particle size.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This system selects the synergistic catalysis of multiple specifications of catalysts of the same mass connected in series, and starts to inject the original gas with a concentration not lower than the maximum concentration of the catalyst. As the concentration decreases after treatment, a gradient synergistic treatment effect of multiple types of mixed catalysts is produced. With the high-concentration catalytic effect as the critical point, a comprehensive evaluation of multiple types of catalysts is carried out and an independent classification temperature analysis is performed. There is no waste of filtered gas during the series connection, thus generating a new coordination method, and a new hybrid catalytic scheme is obtained based on the subsequent judgment of the carbon deposition effect, which diversifies the performance of the catalyst, thereby improving the economy of the catalyst, and the combined use of the catalyst has a positive effect on the coupling of the catalyst and the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of a catalyst experimental system; Figure 2 Schematic diagram of the MOR skeleton.

[0019] In the figure: 1. Catalytic treatment module; 11. Catalytic unit; 12. Multi-specification fillers of the same mass; 13. Series gas circuit; 14. Exhaust pipe; 2. Data processing module; 3. Gas supply module; 4. Gas detection module; 5. TPO module; 51. Initial temperature rise and reduction unit; 52. Middle temperature rise and reduction unit; 53. Terminal temperature rise and reduction unit; 6. Weighing module. DETAILED DESCRIPTION

[0020] See also Figure 1-Figure 2 , Example 1: In order to solve the problem of long experimental cycles during practical applications when conducting experiments within the applicable range of the catalyst, the following system is designed. The improvements are as follows: This embodiment includes a catalytic treatment module 1, which has no less than two catalytic units 11 connected in series with gas paths. Each catalytic unit 11 is detachably connected to a filler 12 of different specifications and weights. The filler 12 of different specifications and weights has at least two catalyst fillers of different specifications. The catalyst specifications include volume and type, and also include: The gas detection module 4 collects the gas concentration emitted from the end of the catalytic unit 11 and transmits the data to the data processing module 2; The air supply module 3 is connected between the air source and the air inlet of the catalytic unit 11. The data processing module 2 controls the concentration and flow rate of carbon monoxide and dimethyl ether in the gas entering the catalytic unit 11 through the air supply module 3. The intake air concentration of the catalytic unit 11 gradually decreases according to the series gas flow sequence. The TPO module 5 is used to classify and independently analyze the catalysts in the same-mass and multi-specification fillers 12 according to particle size, and to collect test samples by heating the catalysts to 200°C-300°C through the initial temperature-raising and reduction unit 51, to 300°C-400°C through the middle temperature-raising and reduction unit 52, and to 400°C-600°C through the terminal temperature-raising and reduction unit 53.

[0021] Improvement principle: After obtaining multiple types of catalysts, each catalyst has an optimal gas concentration, including carbon monoxide concentration and / or dimethyl ether concentration. Different catalysts have different effects at different concentrations. Therefore, first of all, the present technical solution sets up a catalytic treatment module 1, which has two catalytic units 11 connected in series inside the catalytic treatment module 1, and the catalytic unit 11 is filled with multi-specification fillers 12 of the same mass. In addition, if the multi-specification fillers 12 of the same mass are spherical with the same particle size, they can be layered and arranged in an orderly manner through positioning trays to ensure that the quality of each type of catalyst is the same and distributed in an orderly manner. If the catalyst type is the same, when screening different particle sizes, they can be placed in an orderly manner by means of trays, or they can be evenly distributed and then obtained by screening. This method is more convenient for the natural mass loss of the experimental catalyst after screening, simulating the use loss of the catalyst, and thus determining the optimal particle size.

[0022] Secondly, the intake air concentration of the catalytic unit 11 gradually decreases according to the order of gas flow in series, and the catalysts are divided into zones according to the maximum and minimum intake air concentrations specified in the specifications for the various catalyst types. During the experiment, raw gas with a concentration no less than the maximum intake air concentration was injected into the first catalytic unit 11, based on the maximum and minimum intake air concentrations. The gas detection module 4 detected the gas concentration after treatment by the catalytic unit 11 to determine the catalyst's treatment effect. Because fewer catalysts are suitable for the maximum intake air concentration, catalysts suitable for low concentrations are rapidly adsorbed, accelerating carbon deposition. This results in a faster carbon deposition rate within the preceding, multi-specification packing 12 of the same mass than within the subsequent, multi-specification packing 12 of the same mass. After the series connection, the gas concentration decreases, allowing the gas to continue flowing into the subsequent catalytic unit 11, gradually reaching a concentration suitable for the catalyst with lower concentration requirements. When the adsorption efficiency within the first catalytic unit 11 decreases or becomes unavailable, the exhaust gas concentration detected by the gas detection module 4 begins to rise, and the experiment is terminated. The catalysts within the multi-specification packing 12 of the same mass are classified and heated for reduction using the TPO module 5.

[0023] Oxygen is injected into the catalyst for oxidation. Within the temperature range of the initial temperature reduction unit 51, desorption peaks for dimethyl ether and methyl acetate are observed. Within the temperature range of the intermediate temperature reduction unit 52, partially adsorbed H₂O and hydrogen-rich carbon precursors undergo oxidative combustion. In the terminal temperature reduction unit 53, carbon deposits on the catalyst undergo oxidative combustion. This information is captured using O₂-TPO spectrometry. The O₂-TPO spectrometry allows carbon deposition to be assessed based on the normalized integrated area of ​​the CO₂ mass spectrometry signal obtained within the high-temperature range of the terminal temperature reduction unit 53. The desorption of dimethyl ether and methyl acetate is measured in the initial temperature reduction unit 51, thereby assessing adsorption effectiveness.

[0024] During the cyclic experiment, the concentration of the gas treated by the preceding catalytic unit 11 decreases, and the low-concentration mixed gas enters the subsequent catalytic unit 11 for secondary treatment. After multiple series connections, the same filler 12 of the same mass and specifications forms different adsorption effects at different concentrations, thereby forming gradient data, which makes it easier to find problems.

[0025] Gas detection module 4 is an online gas chromatograph capable of detecting gas concentrations. This module can measure the combined effects of different catalyst types, creating novel coordination methods. Based on the subsequent assessment of carbon deposition effects, a new hybrid catalytic solution can be developed, diversifying catalyst performance and improving catalyst economics. The combined use of catalysts also positively impacts the coupling between catalysts and the production line. Gas supply module 3 primarily controls the supply of dimethyl ether and carbon monoxide, thereby controlling the intake air concentration.

[0026] For example: substance A, substance B, and substance C have the same particle size but different categories, and are filled with the same mass into the same mass and multi-specification fillers 12. The catalytic units 11 connected in series form gases of various mixed concentrations that enter the catalytic unit 11 and are tested simultaneously. When the adsorption effect of the front-end catalytic unit 11 decreases and the concentration of the gas discharged through the catalytic unit 11 rises again, the equipment is stopped and detection is started. The desorption effect is obtained based on the exhaust gas concentration of the catalytic unit 11 detected by the gas detection module 4, and the adsorption amount and carbon deposition amount are obtained through the weighing module 6. From the above content, it can be known that the best treatment effect of substance A, substance B, and substance C at a certain gas concentration, the carbon deposition effect and adsorption effect of the three substances at different gas concentrations, and that carbon deposition is more likely to occur in a high-concentration state, thereby obtaining the carbon deposition rate of the three substances at different concentrations, and providing multiple references for the user's application.

[0027] Furthermore, the catalytic treatment module 1 independently controls the reaction environment inside the catalytic unit 11 , and the reaction environment includes temperature, pressure, and gas time-space velocity.

[0028] If other parameters are needed for experiments, the catalytic environment of each catalytic unit 11 can be changed independently, mainly for the purpose of more accurate screening.

[0029] Example 2:

[0030] Based on the first embodiment, this embodiment makes the following improvements to prevent the gas concentration after being treated by the catalytic unit 11 from being lower than the subsequent use standard and to reduce gas waste: The catalytic unit 11 at the end is provided with an exhaust pipe 14, and a series gas path 13 is provided between the two adjacent catalytic units 11. The number of gas detection modules 4 is 1, and the air inlet end of the gas detection module 4 is connected to the series gas path 13 and the exhaust pipe 14 respectively. The gas source includes original gas and supplementary gas. The original gas enters through the front end of the catalytic unit 11 in the direction of air flow movement. The supplementary gas is set at the series gas path 13. The data processing module 2 controls the gas concentration and gas flow of the supplementary gas according to the gas parameters in the series gas path 13 collected by the gas detection module 4.

[0031] Improved Principle: Gas concentration parameters collected by gas detection module 4 are transmitted to data processing module 2. This data processing module controls the gas supply module to adjust the concentration of dimethyl ether and / or carbon monoxide in the supplemental gas, thereby enabling a multi-interval gradient experiment. A small amount of gas enters gas detection module 4 for sampling, while a larger amount is transported to subsequent stages, reducing gas waste.

[0032] Example 3:

[0033] This embodiment is based on the first embodiment and is mainly used to determine the application effect under the cyclic use state. The improvements are as follows: During the circulation experiment, the initial temperature-raising reduction unit 51 independently treats the catalyst, the middle temperature-raising reduction unit 52 and the terminal temperature-raising reduction unit 53 stop operating, and the treated catalyst continues to be filled into the same-mass multi-specification filler 12 for continued use, and is detected by the gas detection module 4. Finally, the data processing module 2 processes the data of the gas detection module 4 to obtain the difference in the gas treatment effect of the secondary use of the catalyst.

[0034] During the cycle experiment, mainly to detect carbon deposition, dimethyl ether and methyl acetate are desorbed only through the initial temperature reduction unit 51. The adsorption efficiency changes after multiple cycles, and the increase in carbon deposition is judged by the adsorption efficiency.

[0035] Example 4:

[0036] The weighing module 6 is added, and its main purpose is to use quality to judge the quality loss problem based on the appearance loss.

[0037] The mass change of the reduced catalyst after being processed by the initial temperature-raising reduction unit 51 is obtained by the weighing module 6 , and the data processing module 2 combines the parameters of the weighing module 6 and the gas detection module 4 to analyze the use effect of the catalyst.

[0038] Although the catalyst will lose mass during use and a small amount of carbon deposits will adhere to the catalyst, causing the catalyst's mass to decrease, a small amount of carbon deposits will also increase its mass to a certain extent. Therefore, it can be calculated by the following: A: The mass of the catalyst remains unchanged, and the catalytic effect decreases under the same concentration of gas. At this time, the mass of the catalyst decreases and the amount of carbon deposits increases.

[0039] B: The quality of the catalyst decreases and the catalyst is lost.

[0040] C: The mass of the catalyst increases, and the catalytic effect of the subsequent gas with the same concentration decreases. The mass of the catalyst decreases slightly or remains unchanged.

[0041] The specific implementation process is as follows: Step 1: Select multiple types of catalysts with the same particle size and stack them evenly or in layers in a packing 12 of multiple specifications with the same mass. Partition the catalysts according to the maximum and minimum intake air concentrations specified in the specifications. Select multiple catalytic units 11 for series connection based on the area range, and place the loaded packing 12 of multiple specifications with the same mass into the catalytic units 11. Step 2: The gas supply module 3 injects the raw gas with a concentration not less than the maximum intake concentration into the catalytic unit 11. The concentration of the gas after being processed by the catalytic unit 11 is collected by the gas detection module 4. The residual gas is transported to the subsequent catalytic unit 11 by pressurized transportation, and the gas with a concentration corresponding to the detection result of the gas detection module 4 is replenished by the supplementary gas. Step 3: When the gas detection module 4 detects that the intake air concentration of the catalytic unit 11 is lower than the required concentration or the set concentration, the gas supply module 3 adjusts the supplementary gas concentration; Step 4: The gas detection module 4 collects the highest concentration of gas after passing through the catalytic unit 11. When the gas concentration changes and continues to rise, the catalysis stops. Step 5: After taking out the fillers 12 of the same mass and specifications and sorting them by type, the fillers are processed by the TPO module 5. The catalyst is heated to 300° C. by the initial temperature reduction unit 51. The change in catalyst mass and the released concentrations of dimethyl ether and methyl acetate are detected. Steps 1 to 3 are repeated, and the catalyst mass loss, carbon deposition amount, and released concentrations of dimethyl ether and methyl acetate are compared multiple times to determine the optimal value. Step 6: After step 4, the catalyst is processed by the middle temperature reduction unit 52 and the terminal temperature reduction unit 53, and the amount of carbon deposits is determined based on the H2O and CO2 reaction peaks.

[0042] Step 7: Obtain the corresponding intake concentration parameters for the single-category catalyst optimized in step 6. Further divide the optimal intake concentration parameters into multiple intervals through step 1, and load catalysts of various particle sizes for secondary experiments to determine the optimal particle size.

[0043] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A catalyst experimental system, comprising a catalytic treatment module (1), characterized in that: The catalytic treatment module (1) has no less than two catalytic units (11) connected in series with gas paths, each of the catalytic units (11) is detachably connected with a filler (12) of multiple specifications of the same mass, and the filler (12) of multiple specifications of the same mass has at least two specifications of catalyst fillers, and the catalyst specifications include volume and type, and also include: A gas detection module (4) collects the concentration of gas emitted from the end of the catalytic unit (11) and transmits the data to the inside of the data processing module (2); An air supply module (3) is connected between the air source and the air inlet of the catalytic unit (11), and the data processing module (2) regulates the concentration and flow rate of carbon monoxide and dimethyl ether in the gas entering the catalytic unit (11) through the air supply module (3), and the intake concentration of the catalytic unit (11) gradually decreases according to the series gas flow sequence; The TPO module (5) is used to analyze the catalyst in the same mass and multi-specification fillers (12) independently according to particle size classification, and to heat the catalyst to 200°C-300°C through the initial temperature-raising and reduction unit (51), to 300°C-400°C through the middle temperature-raising and reduction unit (52), and to 400°C-600°C through the terminal temperature-raising and reduction unit (53), and collect test samples.

2. A catalyst experimental system according to claim 1, characterized in that: The catalytic unit (11) at the end is provided with an exhaust pipe (14), and a series gas circuit (13) is provided between two adjacent catalytic units (11). The number of the gas detection module (4) is one, and the air inlet end of the gas detection module (4) is respectively connected to the series gas circuit (13) and the exhaust pipe (14).

3. A catalyst experimental system according to claim 2, characterized in that: The gas source includes original gas and supplementary gas. The original gas enters through the catalytic unit (11) at the front end of the air flow direction. The supplementary gas is set at the series gas path (13). The data processing module (2) controls the supplementary gas concentration and the supplementary gas flow rate according to the gas parameters in the series gas path (13) collected by the gas detection module (4).

4. A catalyst experimental system according to claim 1, characterized in that: During the cycle experiment, the initial stage temperature-raising reduction unit (51) independently processes the catalyst, the middle stage temperature-raising reduction unit (52) and the terminal stage temperature-raising reduction unit (53) stop operating, and the treated catalyst is continuously filled into the same-mass multi-specification filler (12) for continued use, and is detected by the gas detection module (4). Finally, the data processing module (2) processes the data of the gas detection module (4) to obtain the difference in the gas treatment effect of the second use of the catalyst.

5. A catalyst experimental system according to claim 4, characterized in that: The mass change of the reduced catalyst after being processed by the initial temperature-raising reduction unit (51) is obtained through a weighing module (6), and the data processing module (2) combines the parameters of the weighing module (6) and the gas detection module (4) to analyze the use effect of the catalyst.

6. A catalyst experimental system according to claim 1, characterized in that: The catalytic treatment module (1) independently controls the reaction environment inside the catalytic unit (11), and the reaction environment includes temperature, pressure, and gas time-space velocity.

7. The experimental method of a catalyst experimental system according to any one of claims 1 to 6, characterized in that: include: Step 1: Select multiple types of catalysts with the same particle size and stack them evenly or in layers in a packing (12) with the same mass and specifications, divide the area according to the maximum intake concentration and the minimum intake concentration in the instructions of the multiple types of catalysts, select multiple catalytic units (11) according to the area range and connect them in series, and place the loaded packing (12) with the same mass and specifications into the catalytic unit (11); Step 2: The gas supply module (3) injects the original gas with a concentration not less than the maximum intake concentration into the catalytic unit (11), the concentration of the gas after being processed by the catalytic unit (11) is collected by the gas detection module (4), and the residual gas is transported to the subsequent catalytic unit (11) in the form of pressurized transportation, and the gas with a concentration corresponding to the detection result of the gas detection module (4) is supplemented by the supplementary gas; Step 3: When the gas detection module (4) detects that the intake concentration of the catalytic unit (11) is lower than the required concentration or the set concentration, the gas supply module (3) adjusts the supplementary gas concentration; Step 4: The gas detection module (4) collects the highest concentration of gas after passing through the catalytic unit (11). When the gas concentration changes and continues to rise, the catalysis stops; Step 5: Take out the fillers (12) of the same mass and specifications and distinguish them by type, then process them through the TPO module (5), heat the catalyst to 300°C by the initial temperature reduction unit (51), detect the change in catalyst mass and the release concentrations of dimethyl ether and methyl acetate, and repeat steps 1 to 3, compare the catalyst mass loss, carbon deposition amount and the release concentrations of dimethyl ether and methyl acetate multiple times to determine the best; Step 6: After step 4, the catalyst is treated by a middle temperature-raising reduction unit (52) and a terminal temperature-raising reduction unit (53), and the amount of carbon deposits is determined based on the H2O and CO2 reaction peaks; Step 7: Obtain the corresponding intake concentration parameters for the single-category catalyst optimized in step 6. Further divide the optimal intake concentration parameters into multiple intervals through step 1, and load catalysts of various particle sizes for secondary experiments to determine the optimal particle size.

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