A catalyst experiment system and experiment method

Abstract

The present application relates to the technical field of catalyst experiment, and specifically discloses a catalyst experiment system and experiment method, which comprises a catalytic treatment module, the catalytic treatment module has not less than two catalytic units in series connection in a gas circuit, each catalytic unit is detachably connected with same mass and multiple specifications of fillers, the same mass and multiple specifications of fillers have at least two specifications of catalyst fillers, the specifications of catalysts include volume and type, a gas detection module collects the gas concentration discharged from the end of the catalytic unit, and data is transmitted to the inside of a data processing module; the system selects the same mass and multiple specifications of catalysts in series connection for collaborative catalysis, raw gas with not less than the maximum concentration of catalyst is injected, and the concentration is reduced after treatment, thereby producing a gradient type collaborative treatment effect of multiple types of mixed catalysts, a brand-new mixed type catalytic scheme is obtained according to the subsequent judged carbon deposition effect, and the performance of the catalyst is diversified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of catalyst experiment, in particular to a catalyst experiment system and experiment method. BACKGROUND

[0002] Molecular sieve of mordenite is also called MOR, please refer to Figure 2 The framework of MOR is composed of 12-membered ring channels and 8-membered ring channels. The Bronsted acid site on the 8-membered ring channel is the active site for dimethyl ether group, and the confinement effect plays a positive role in selectively generating target product methyl acetate. However, the Bronsted acid site on the 12-membered ring channel plays a positive role in carbon deposition, and the growth rate of carbon deposition is proportional to the deactivation rate of the molecular sieve.

[0003] Carbon deposition is mainly derived from the activated dimethyl ether or methyl acetate molecules in the process of dimethyl ether carbonylation reaction catalyzed by MOR, so part of the reason for carbon deposition is the dimethyl ether concentration in the raw gas. In addition, the higher the concentration of carbon monoxide, the faster the generation rate of methyl acetate, thereby accelerating the generation of carbon deposition and increasing the deactivation rate of MOR.

[0004] At present, the Bronsted acid site on the 12-membered ring channel of MOR is being continuously optimized, such as changing the active site, using pyridine adsorption to reduce the number of Bronsted acid sites on the 12-membered ring channel, reducing activity and increasing service life. Therefore, new improved MOR is continuously produced for market selection.

[0005] Dalian Institute of Chemical Physics completed the long-period experiment and regeneration performance experiment of dimethyl ether carbonylation and methyl acetate hydrogenation catalyst, wherein the dimethyl ether carbonylation catalyst adopts mordenite molecular sieve, and the service life of the catalyst is 4000-6000h. From the above, it can be seen that the service life of the catalyst is very long.

[0006] In summary: in order to apply the catalyst, firstly, the problem of carbon deposition deactivation needs to be considered, secondly, the concentration ratio of dimethyl ether and carbon monoxide in the raw gas needs to be considered, and the particle size of the catalyst needs to be considered in order to reduce the loss of repeated use. If the existing raw gas ratio parameters are used for experiment, the original raw gas ratio can meet the service life of 4000+ hours of the catalyst, which leads to a long experiment period of the catalyst, and a large number of experimental samples cannot be produced due to the time limit, so the adaptability cannot be best, which is not suitable for the current market environment of frequent appearance of MOR improved products. SUMMARY

[0007] The purpose of the present application is to provide a catalyst experimental system and experimental method, the system selects the same mass and multiple specifications of catalysts in series to catalyze, starts to inject the original gas with a concentration not lower than the maximum concentration of the catalyst, and generates a gradient type of multiple mixed catalysts with a synergistic treatment effect as the concentration decreases after treatment, takes the high concentration catalytic effect as the critical point, comprehensively evaluates and independently classifies the multiple catalysts, and analyzes the temperature rise, and the waste of filtered gas is not generated in the series process, thereby generating a new matching mode, and obtaining a new mixed catalyst scheme according to the subsequent judgment of the carbon deposition effect, so that the performance of the catalyst is diversified, thereby improving the economy of the catalyst, and the combination of the catalyst and the production line plays a positive effect to solve the problems in the above background technology.

[0008] To achieve the above object, the present application provides the following technical scheme:

[0009] A catalyst experimental system, comprising a catalytic treatment module, the catalytic treatment module has not less than two and gas path series connected catalytic units, each of the catalytic units is detachably connected with the same mass and multiple specifications of fillers, the same mass and multiple specifications of fillers have at least two specifications of catalyst fillers, and the specifications of catalysts include volume and type, and further comprising:

[0010] A gas detection module collects the gas concentration discharged from the end of the catalytic unit and transmits data to the data processing module;

[0011] A gas supply module is connected between the gas source and the gas inlet of the catalytic unit, the data processing module adjusts the concentration and flow of carbon monoxide and dimethyl ether in the gas entering the catalytic unit through the gas supply module, and the inlet concentration of the catalytic unit gradually decreases according to the series gas flow sequence;

[0012] A TPO module is used for independently analyzing the catalysts in the same mass and multiple specifications of fillers according to particle size, and heating to 200-300 DEG C through an initial stage temperature reduction unit, heating to 300-400 DEG C through a middle stage temperature reduction unit, and heating to 400-600 DEG C through a terminal temperature reduction unit, and collecting and detecting samples.

[0013] As a further scheme of the present application: the end of the catalytic unit is provided with an exhaust pipe, two adjacent catalytic units are provided with series gas paths, the number of the gas detection module is 1, and the gas inlet of the gas detection module is respectively communicated with the series gas paths and the exhaust pipe.

[0014] As a further scheme of the present application: the gas source comprises original gas and supplementary gas, the original gas enters through the front end of the catalytic unit in the gas flow direction, the supplementary gas is arranged at the serial gas path, and the data processing module controls the supplementary gas concentration and the supplementary gas flow according to the gas parameters collected by the gas detection module in the serial gas path.

[0015] As a further scheme of the present application: during the circulation experiment, the initial-stage temperature-raised reduction unit independently processes the catalyst, the middle-stage temperature-raised reduction unit and the terminal-stage temperature-raised reduction unit stop working, the processed catalyst continues to be filled into the same mass and multiple specifications of the filler for continuous use, and the gas detection module is used for detection, and finally the data processing module is used for data processing of the gas detection module to obtain the difference of the gas processing effect of the secondary use of the catalyst.

[0016] As a further scheme of the present application: the mass change of the reduction catalyst processed by the initial-stage temperature-raised reduction unit is obtained by the weighing module, and the data processing module is combined with the parameters of the weighing module and the gas detection module to analyze the use effect of the catalyst.

[0017] As a further scheme of the present application: the catalytic processing module independently controls the reaction environment in the catalytic unit, and the reaction environment comprises temperature, pressure and gas space velocity.

[0018] As a further scheme of the present application: comprising the following steps:

[0019] Step one: a plurality of types of catalysts with the same particle size are uniformly or orderly stacked in the same mass and multiple specifications of the filler according to the maximum inlet gas concentration and the minimum inlet gas concentration in the specification of the plurality of types of catalysts, a plurality of catalytic units are selected for series connection according to the region range, and the same mass and multiple specifications of the filler filled are placed into the catalytic unit;

[0020] Step two: the gas supply module injects original gas with an inlet gas concentration not lower than the maximum inlet gas concentration into the catalytic unit, the gas concentration after the catalytic unit processing is collected by the gas detection module, the residual gas is transported to the subsequent catalytic unit in the form of pressure delivery, and the gas with the concentration corresponding to the detection result of the gas detection module is supplemented by the supplementary gas;

[0021] Step three: when the gas detection module detects that the inlet gas concentration of the catalytic unit is lower than the required concentration or the set concentration, the gas supply module adjusts the supplementary gas concentration;

[0022] Step four: after the gas detection module collects the gas concentration change of the highest concentration gas after the catalytic unit processing and the gas concentration change appears persistent rise, the catalysis stops;

[0023] Step five: take the same mass of multi-specification fillers and divide them by type, then process them through the TPO module, heat the catalyst to 300 DEG C by the initial-stage temperature rising reduction unit, detect the catalyst mass change and the release concentration of dimethyl ether and methyl acetate, and repeat steps one to three, compare the catalyst mass loss, carbon deposition and release concentration of dimethyl ether and methyl acetate multiple times to determine the optimum;

[0024] Step six: after step four, the catalyst is processed by the middle-stage temperature rising reduction unit and the terminal temperature rising reduction unit, and the carbon deposition is determined according to the H2O and CO2 reaction peaks.

[0025] Step seven: the single-type catalyst optimized in step six obtains the corresponding inlet concentration parameters, the optimal inlet concentration parameters are further divided into multiple intervals by step one, and multiple particle sizes of catalysts are filled for secondary experiments to determine the optimal particle size.

[0026] Compared with the prior art, the beneficial effects of the present application are:

[0027] The system selects a series of the same mass of multi-specification catalysts for collaborative catalysis, starts to inject the original gas with a concentration not lower than the maximum concentration of the catalyst, and generates a gradient multi-class mixed catalyst collaborative processing effect as the concentration decreases after processing, takes the high concentration catalytic effect as the critical point, comprehensively evaluates and independently classifies the multi-class catalysts, and analyzes the temperature rising, and the waste of filtered gas is not generated in the series process, thereby generating a new matching mode, obtaining a new mixed catalyst scheme according to the subsequent carbon deposition effect, making the performance of the catalyst diverse, 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 DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 It is a system schematic diagram of a catalyst experimental system;

[0030] Figure 2 It is a skeleton schematic diagram of MOR.

[0031] In the figure: 1, catalytic treatment module; 11, catalytic unit; 12, same mass multi-specification filler; 13, series gas path; 14, exhaust path; 2, data processing module; 3, gas supply module; 4, gas detection module; 5, TPO module; 51, initial stage temperature reduction unit; 52, middle stage temperature reduction unit; 53, end stage temperature reduction unit; 6, weighing module. DETAILED DESCRIPTION

[0032] Please refer to Figures 1-2 Example one:

[0033] This embodiment is to solve the problem of long experimental period in the actual application process for the adaptation range of the catalyst, and the following system is designed, and the improvement contents are as follows:

[0034] This embodiment includes a catalytic treatment module 1, the catalytic treatment module 1 has not less than two catalytic units 11 in series, and each catalytic unit 11 is detachably connected with a same mass multi-specification filler 12, and the same mass multi-specification filler 12 has at least two kinds of catalyst fillers, and the catalyst specification includes volume, type, and the following:

[0035] The gas detection module 4 collects the gas concentration discharged from the end of the catalytic unit 11, and transmits the data to the data processing module 2 inside;

[0036] The gas supply module 3 is connected between the gas source and the gas inlet of the catalytic unit 11, and the data processing module 2 adjusts the concentration and flow of carbon monoxide and dimethyl ether in the gas entering the catalytic unit 11 through the gas supply module 3, and the inlet concentration of the catalytic unit 11 gradually decreases according to the series gas flow circulation order;

[0037] The TPO module 5 is used for classifying and independently analyzing the catalysts in the same mass multi-specification filler 12 according to particle size, and heating to 200-300 DEG C through the initial stage temperature reduction unit 51, to 300-400 DEG C through the middle stage temperature reduction unit 52, and to 400-600 DEG C through the end stage temperature reduction unit 53, and collecting and detecting samples.

[0038] Improvement principle:

[0039] After the multi-type catalysts are obtained, each catalyst has an optimal gas concentration, including a carbon monoxide concentration and / or a dimethyl ether concentration. Different catalysts have different effects at different concentrations. Therefore, the technical solution first provides a catalytic treatment module 1, which has two catalytic units 11 connected in series inside the catalytic treatment module 1, and the catalytic units 11 are filled with the same mass multi-specification fillers 12. It is additionally explained that if the same mass multi-specification fillers 12 are spherical balls with the same particle size, they can be placed in layers in an orderly manner through positioning trays to ensure that each type of catalyst has the same mass and is distributed in an orderly manner. If the catalyst types are the same, the different particle sizes can be placed in an orderly manner through the trays or can be uniformly distributed, and then are obtained through subsequent screening. This method is more convenient for the natural mass loss of the experimental catalysts after screening, simulates the use loss of the catalysts, and thus determines the optimal particle size.

[0040] Secondly, the gas concentration of the catalytic unit 11 gradually decreases in the order of gas flow through the series connection, and is divided into zones according to the maximum gas concentration and the minimum gas concentration in the multi-type catalyst specification. During the experiment, the original gas with a concentration not lower than the maximum gas concentration is injected into the first catalytic unit 11, the gas concentration after the treatment of the catalytic unit 11 is detected by the gas detection module 4, and the treatment effect of the catalyst is obtained. Since there are fewer types of catalysts that can adapt to the maximum gas concentration, the catalysts that can adapt to low concentrations quickly adsorb and accelerate carbon deposition. The carbon deposition rate in the same mass multi-specification filler 12 in the front sequence is greater than that in the subsequent same mass multi-specification filler 12. After being connected in series, the gas concentration decreases, and thus continues to move to the rear catalytic unit 11, and the gas concentration gradually adapts to the catalysts with low concentration requirements. When the adsorption efficiency of the first catalytic unit 11 decreases or cannot be adsorbed, the exhaust gas concentration detected by the gas detection module 4 begins to rise, and the experiment is stopped. The catalysts in the same mass multi-specification filler 12 are classified and reduced in temperature through the TPO module 5.

[0041] The temperature oxidation is performed by injecting oxygen. In the temperature range of the initial temperature reduction unit 51, the desorption peaks of dimethyl ether and methyl acetate are obtained. In the temperature range of the middle temperature reduction unit 52, the oxidation combustion of part of the adsorbed H2O and the hydrogen-rich carbon deposition precursor is obtained. In the terminal temperature reduction unit 53, the oxidation combustion of the carbon deposition on the catalyst is obtained, and the O2-TPO spectrum is obtained. The carbon deposition condition can be judged according to the normalized integral area of the CO2 mass spectrum signal obtained in the high-temperature interval of the terminal temperature reduction unit 53. The adsorption effect can be judged according to the dimethyl ether and methyl acetate desorption obtained by the initial temperature reduction unit 51.

[0042] During the cycle experiment, the gas concentration after the pre-catalytic unit 11 treatment decreases, and the low-concentration mixed gas enters the subsequent catalytic unit 11 for secondary treatment. After multiple series, the same mass of multi-specification fillers 12 with the same filler form different adsorption effects under different concentrations, thereby forming gradient data and making it easier to find problems.

[0043] The gas detection module 4 is an online gas chromatograph, and the gas detection module 4 can detect the gas concentration. Through the gas detection module 4, the combination effect of different types of catalysts can be obtained, thereby producing a new matching mode, and a new mixed catalyst scheme is obtained according to the subsequent judgment of the carbon deposition effect, 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. The gas supply module 3 mainly controls the supply amount of dimethyl ether and carbon monoxide, thereby controlling the inlet gas concentration.

[0044] For example, the particle sizes of substances A, B, and C are the same, the categories are different, the same mass is filled into the same mass of multi-specification fillers 12, and a variety of mixed concentrations of gas enter the catalytic unit 11 in series, and the experiment is synchronized. When the adsorption effect of the front-end catalytic unit 11 decreases and the gas concentration discharged from the catalytic unit 11 rises, stop the equipment operation and start detection. The desorption effect is obtained according to the gas concentration of the catalytic unit 11 discharged by the gas detection module 4, and the adsorption amount and carbon deposition amount are obtained by the weighing module 6. The above content can obtain the best treatment effect of substances A, B, and C under a certain gas concentration, the carbon deposition effect and adsorption effect of the three substances under different gas concentrations, and the carbon deposition is more likely to occur under high concentration, thereby obtaining the carbon deposition speed of the three substances under different concentrations, and providing multiple references for the application of users.

[0045] Further, the catalytic treatment module 1 independently controls the reaction environment in the catalytic unit 11, and the reaction environment includes temperature, pressure, and gas space velocity.

[0046] If other parameters need to be tested, each catalytic unit 11 can be independently changed, and the purpose is mainly to more accurately screen.

[0047] Example Two:

[0048] Based on example one, in order to avoid the gas concentration after the catalytic unit 11 treatment being lower than the subsequent use standard, and to reduce the waste of gas, the following improvements are made:

[0049] The end catalytic unit 11 is provided with an exhaust pipeline 14, and two adjacent catalytic units 11 are provided with a series gas path 13. The number of the gas detection module 4 is 1, the gas inlet end of the gas detection module 4 is communicated with the series gas path 13 and the exhaust pipeline 14 respectively, the gas source includes original gas and supplementary gas, the original gas enters through the catalytic unit 11 at the most front end of the gas flow movement direction, and the supplementary gas is arranged at the series gas path 13. The data processing module 2 controls the supplementary gas concentration and the supplementary gas flow according to the gas parameters collected by the gas detection module 4 in the series gas path 13.

[0050] The improvement principle is that the gas concentration parameters collected by the gas detection module 4 are transmitted to the data processing module 2, the supplementary gas concentration of dimethyl ether and / or carbon monoxide is adjusted by the data processing module 2, and the multi-interval gradient experiment is realized. A small amount of gas enters the gas detection module 4 for sampling, and a large amount of gas is transported to the subsequent, thereby reducing the waste of gas.

[0051] Embodiment three:

[0052] This embodiment is based on embodiment one, and mainly aims to judge the application effect in the recycling state. The improvement content is as follows:

[0053] In the recycling experiment, the initial stage temperature reduction unit 51 independently processes the catalyst, the middle stage temperature reduction unit 52 and the end temperature reduction unit 53 stop working, the processed catalyst continues to be filled into the same mass and multi-specification filler 12 for continuous use, and is detected by the gas detection module 4. Finally, the difference of the gas processing effect of the secondary use of the catalyst is obtained by the data processing module 2 processing the data of the gas detection module 4.

[0054] In the recycling experiment, mainly for detecting the carbon deposition, only the initial stage temperature reduction unit 51 is used to desorb dimethyl ether and methyl acetate, the adsorption efficiency changes after multiple recycling, and the increase of carbon deposition is judged by the adsorption efficiency.

[0055] Embodiment four:

[0056] The weighing module 6 is additionally arranged, and the main purpose is to judge the mass loss problem by using the mass on the basis of appearance loss judgment.

[0057] The mass change of the reduction catalyst processed by the initial stage temperature reduction unit 51 is obtained by the weighing module 6, and the use effect of the catalyst is analyzed by the data processing module 2 combining the parameters of the weighing module 6 and the gas detection module 4.

[0058] Although the catalyst will produce mass loss and a small amount of carbon deposition will cause the mass of the catalyst to decrease during use, a small amount of carbon deposition will also cause a certain mass increase. Therefore, the following content can be calculated:

[0059] A: the catalyst quality is unchanged, the catalytic effect is reduced under the same concentration of gas, the catalyst quality is reduced, and the amount of carbon deposition is increased.

[0060] B: the catalyst quality is reduced, and the catalyst is lost.

[0061] C: the catalyst quality is increased, the catalytic effect is reduced under the same concentration of gas, the catalyst quality is reduced, or the catalyst quality is unchanged.

[0062] The specific implementation process is as follows:

[0063] Step one: select multiple types of catalysts of the same particle size and uniformly or orderly stack them in the same mass and multiple specifications of the filler 12, divide them according to the maximum inlet gas concentration and the minimum inlet gas concentration in the multiple types of catalysts, select multiple catalytic units 11 according to the range of the regions, and place the filled same mass and multiple specifications of the filler 12 into the catalytic unit 11.

[0064] Step two: the gas supply module 3 injects the original gas with a concentration not lower than the maximum inlet gas concentration into the catalytic unit 11, the gas concentration after being treated by the catalytic unit 11 is collected by the gas detection module 4, 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.

[0065] Step three: when the inlet gas concentration of the catalytic unit 11 detected by the gas detection module 4 is lower than the required concentration or the set concentration, adjust the concentration of the supplementary gas by the gas supply module 3.

[0066] Step four: after the gas detection module 4 collects the change in the gas concentration of the highest concentration gas after being treated by the catalytic unit 11, the catalysis is stopped when the change appears a persistent rise.

[0067] Step five: take out the same mass and multiple specifications of the filler 12 and divide them by type, process them by the TPO module 5, heat the catalyst to 300°C by the initial-stage temperature reduction unit 51, detect the change in the catalyst quality and the release concentration of dimethyl ether and methyl acetate, and repeat steps one to three to compare the catalyst quality loss, the amount of carbon deposition, and the release concentration of dimethyl ether and methyl acetate multiple times to determine the best.

[0068] Step six: after step four, the catalyst is processed by the middle-stage temperature reduction unit 52 and the end-stage temperature reduction unit 53, and the amount of carbon deposition is determined according to the H2O and CO2 reaction peaks.

[0069] Step seven: the single category catalyst optimized in step six obtains the corresponding intake concentration parameters, the best intake concentration parameters are segmented into multiple intervals by step one, and the catalysts with multiple particle sizes are filled for secondary experiments to determine the best particle size.

[0070] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A catalyst experiment system comprising a catalytic treatment module (1), characterized in that: The catalytic treatment module (1) has not less than two and gas path series catalytic units (11), each of which is detachably connected with the same mass and multiple specifications of fillers (12), at least two specifications of catalyst fillers in the same mass and multiple specifications of fillers (12), and the catalyst specifications include volume, type, and the like: A gas detection module (4) is arranged to collect the gas concentration discharged from the end of the catalytic unit (11) and transmit data to the data processing module (2) inside; A gas supply module (3) is arranged to connect the gas source and the gas inlet of the catalytic unit (11), and the data processing module (2) controls the concentration and flow of carbon monoxide and dimethyl ether in the gas entering the catalytic unit (11) through the gas supply module (3), and the inlet concentration of the catalytic unit (11) gradually decreases in the order of series gas flow. A TPO module (5) is arranged to independently analyze the catalyst in the same mass and multiple specifications of fillers (12) according to particle size, and the catalyst is heated to 200-300℃ by the initial-stage heating reduction unit (51), heated to 300-400℃ by the middle-stage heating reduction unit (52), and heated to 400-600℃ by the end-stage heating reduction unit (53), and the detection sample is collected.

2. The catalyst experimental system according to claim 1, characterized by: The end catalytic unit (11) is provided with an exhaust pipeline (14), and two adjacent catalytic units (11) are provided with a series gas path (13), the number of the gas detection module (4) is 1, and the inlet end of the gas detection module (4) is communicated with the series gas path (13) and the exhaust pipeline (14).

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

4. The catalyst experimental system of claim 1, wherein: During the circulation experiment, the initial-stage heating reduction unit (51) independently processes the catalyst, the middle-stage heating reduction unit (52) and the end-stage heating reduction unit (53) stop working, the processed catalyst continues to be filled into the same mass and multiple specifications of fillers (12) for continuous use, and the catalyst is detected by the gas detection module (4), and finally the difference of the gas treatment effect of the secondary use of the catalyst is obtained by the data processing module (2) processing the data of the gas detection module (4).

5. The catalyst experimental system of claim 4, wherein: The mass change of the reduced catalyst processed by the initial-stage heating reduction unit (51) is obtained by the weighing module (6), and the use effect of the catalyst is analyzed by the data processing module (2) in combination with the parameters of the weighing module (6) and the gas detection module (4).

6. The catalyst experimental system of claim 1, wherein: The catalytic treatment module (1) independently controls the reaction environment in the catalytic unit (11), and the reaction environment includes temperature, pressure, and gas space velocity.

7. The experimental method of a catalyst experimental system according to any one of claims 1-6, characterized in that: Including: Step one: Select the same size of multi-type catalysts uniformly or sequentially according to the layer, and place them into the same mass multi-specification filler (12). According to the maximum inlet gas concentration and the minimum inlet gas concentration in the multi-type catalyst specification, the area is divided, and multiple catalytic units (11) are selected according to the area range for series connection. The same mass multi-specification filler (12) filled is placed into the catalytic unit (11); Step two: The gas supply module (3) injects the original gas with a concentration not lower than the maximum inlet gas concentration into the catalytic unit (11). The gas concentration after the catalytic unit (11) treatment is collected by the gas detection module (4). The residual gas is transported to the subsequent catalytic unit (11) in the form of pressurized delivery, and the gas with a concentration corresponding to the detection result of the gas detection module (4) is supplemented; Step three: When the gas detection module (4) detects that the inlet gas concentration of the catalytic unit (11) is lower than the required concentration or the set concentration, the gas supply module (3) adjusts the concentration of the supplementary gas; Step four: After the gas detection module (4) collects the highest concentration gas after the catalytic unit (11), if the gas concentration changes continuously rise, the catalysis stops; Step five: After taking out the same mass multi-specification filler (12) and dividing it by type, the TPO module (5) is used for processing. The initial stage of the temperature reduction unit (51) is used to heat the catalyst to 300°C. The catalyst quality change and the release concentration of dimethyl ether and methyl acetate are detected. Steps one to three are repeated to compare the catalyst quality loss, carbon deposition, and release concentration of dimethyl ether and methyl acetate multiple times to determine the best; Step six: After step four, the catalyst is processed by the middle stage temperature reduction unit (52) and the end stage temperature reduction unit (53). The carbon deposition is determined according to the H2O and CO2 reaction peaks; Step seven: After the optimization in step six, the single-type catalyst obtains the corresponding inlet gas concentration parameters. The best inlet gas concentration parameters are further divided into multiple intervals by step one, and multiple particle sizes of catalysts are loaded for secondary experiments to determine the best particle size.

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