System for testing performance of hydrogen-oxygen composite reaction catalyst

Abstract

The invention provides a testing system for performance of a hydrogen-oxygen composite reaction catalyst. The testing system comprises a reaction container, a hydrogen generator and an air bottle, wherein the hydrogen generator and the air bottle are respectively connected with the reaction container through gas pipelines; a mixing plate and a catalyst plate are arranged in the reaction container. The test system can continuously perform fatigue test on the catalyst for a long time so as to evaluate the stability and catalytic activity of the catalyst as a function of continuous high-temperature catalytic hydrogen combustion. The given average temperature value and standard deviation are based on at least 10000 measurements.

Description

Technical Field

[0001] This invention belongs to the field of testing devices, and in particular relates to a testing system for the performance of catalysts used in hydrogen-oxygen complex reactions. Background Technology

[0002] With the rapid development of the global economy and the increase in energy consumption and industrial production activities, the emissions of greenhouse gases and pollutants such as carbon dioxide, nitrogen oxides, sulfur oxides, and volatile organic compounds have risen significantly. These pollutants not only seriously affect the ecological environment but also pose a threat to human health. Therefore, developing efficient and environmentally friendly catalysts to reduce the emissions of these pollutants and improve energy efficiency is an important research topic today.

[0003] Currently, catalysts are widely used in industrial gas reactions, automotive exhaust treatment, and chemical synthesis. Existing catalysts are typically constructed based on noble metals (such as platinum and palladium) or transition metals (such as nickel and copper), and have achieved certain successes in catalytic efficiency and reaction rate.

[0004] However, catalysts still have shortcomings in terms of catalytic efficiency, selectivity, and operational stability. Therefore, developing a catalyst testing device to determine catalyst performance has significant practical importance and application prospects. Summary of the Invention

[0005] In view of this, the present invention aims to overcome the deficiencies in the prior art and propose a testing system for the performance of catalysts for hydrogen-oxygen complex reactions.

[0006] To achieve the above objectives, the technical solution created by this invention is implemented as follows:

[0007] A testing system for the performance of a catalyst in a hydrogen-oxygen complex reaction is provided. The testing system includes a reaction vessel and a hydrogen generator and an air cylinder connected to the reaction vessel via gas pipelines. The reaction vessel is equipped with a mixing plate and a catalyst plate.

[0008] Furthermore, several catalyst plates are arranged longitudinally from left to right inside the reaction vessel.

[0009] Furthermore, the sidewall of the reactor is provided with at least 15 temperature measuring points, and each temperature measuring point is equipped with a thermocouple.

[0010] Furthermore, the reaction vessel is equipped with two hydrogen concentration test points, and each hydrogen concentration test point is equipped with a hydrogen composition transmitter.

[0011] Furthermore, a hydrogen flow controller is installed on the pipe connecting the hydrogen generator and the reaction vessel.

[0012] Furthermore, an air flow controller is installed on the pipe connecting the air bottle and the reaction vessel.

[0013] Furthermore, both the thermocouple and the hydrogen composition transmitter are electrically connected to the data acquisition unit.

[0014] Furthermore, both the hydrogen flow controller and the air flow controller are electrically connected to the computer.

[0015] Furthermore, the reaction vessel is a cuboid, 100mm long, 50mm wide, and 300mm high, with a volume of 1400mL, and is made of synthetic sapphire glass. Compared to existing technologies,

[0016] This invention has the following advantages:

[0017] (1) The testing system described in this invention can continuously perform fatigue tests on the catalyst for a long time to evaluate the catalyst's stability and catalytic activity as a function of continuous high-temperature catalytic hydrogen combustion. The given average temperature values ​​and standard deviations are based on at least 10,000 measurements.

[0018] (2) The test system described in this invention can be premixed, can accurately control the intake speed, and can study the catalytic composite reaction under different intake speeds and different hydrogen and oxygen volumes. Furthermore, the catalyst arrangement position and gas diffusion area can be changed, and the influence of catalyst layer arrangement and diffusion area on hydrogen and oxygen catalytic reaction can be explored.

[0019] (3) The test system described in this invention is equipped with multiple thermocouples, which can collect the temperature of different parts of the reaction vessel and form a temperature gradient of the reaction vessel, which is convenient for studying the temperature effect of catalytic composite reaction.

[0020] (4) The testing system of the present invention is made of synthetic sapphire glass, which can be used for optical and thermal visibility, as well as for containing internal gas settings. At the same time, a high-resolution infrared thermal imager can be used to observe the high-temperature range of the internal catalyst plate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the test system.

[0022] Figure 2 This is a schematic diagram of the internal structure of the reaction vessel;

[0023] Figure 3 The temperature curve is the performance test temperature curve of the hydrogen-oxygen catalytic composite reaction catalyst in Example 1.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Inlet pipe; 11. Inlet port; 2. Mixing plate; 3. Thermocouple; 31. First mounting port; 4. Catalyst plate; 41. Mounting slot; 5. Hydrogen composition transmitter; 51. Second mounting port; 6. Hydrogen flow controller; 7. Air flow controller; 8. Air cylinder; 9. Hydrogen generator; 10. Computer; 11. Data acquisition unit. Detailed Implementation

[0026] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which this invention pertains. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.

[0027] The invention will be described in detail below with reference to specific embodiments.

[0028] This invention provides a testing system for the performance of catalysts used in hydrogen-oxygen recombination reactions, such as... Figure 1 and Figure 2 As shown, it mainly includes a reaction vessel and gas pipes connected to a hydrogen generator 9 and an air cylinder 7 respectively. Specifically, the bottom of the reaction vessel has two air inlets 11, each connected to an air inlet pipe 1. The two air inlets 1 are connected to the hydrogen generator 9 and the air cylinder 7 respectively.

[0029] To enhance experimental safety and reduce potential hazards, hydrogen is supplied by a hydrogen generator 9 instead of a hydrogen cylinder. Oxygen is supplied by a 40L air cylinder 7, and the high pressure of the cylinder is used to ensure stable transport of the gas at the set flow rate during the experiment.

[0030] Gas flow controllers are installed at the connection points of the inlet pipe 1 and the hydrogen generator 9, as well as on the gas pipeline connecting the inlet pipe 1 and the air cylinder 7. An additional gas flow controller, designated as hydrogen flow controller 6 and oxygen flow controller 8, is added to both the hydrogen and air inlet lines. The testing system of this invention precisely controls the inlet flow rates of the two experimental gases using these gas flow controllers, and by changing the inlet time, different integral values ​​of hydrogen gas can be obtained for the experiment. The gas flow controller is an S600 supplied by HORIBA Corporation of Japan, with a linear accuracy of ±0.5% of full scale.

[0031] The reaction vessel is equipped with mounting slots 41 for installing catalyst plates 4, which are arranged longitudinally from left to right in five pieces. Hydrogen and oxygen undergo a catalytic recombination reaction on the catalyst plates 4, which have dimensions of 55mm*52mm*1mm and a sieve mesh size of 1000 mesh.

[0032] Meanwhile, a thermocouple 3 and a hydrogen composition transmitter 5 are also provided on the side wall of the reaction vessel. The side wall of the reaction vessel is provided with a first mounting port 31 for installing the thermocouple 3 and a second mounting port 51 for installing the hydrogen composition transmitter 5. The first mounting port 31 is located above the catalyst plate 4, and the second mounting port 51 is located below the catalyst plate 4.

[0033] Specifically, thermocouple 2 is a type K thermocouple 2, and hydrogen composition transmitter 5 is an H2 composition transmitter. Fifteen temperature measuring points are set on the side wall of the reaction vessel, each equipped with a thermocouple 3. These 15 measuring points are divided into three groups: an upper group, a middle group, and a lower group, used to measure the temperature of the upper, middle, and lower layers of the catalyst plate 4.

[0034] Two hydrogen concentration testing points are set on the side wall of the reaction vessel, and each hydrogen concentration testing point is equipped with a hydrogen composition transmitter 5. Specifically, a type K thermocouple 2 is used to measure the temperature change caused by the exothermic reaction during the experiment. Its measurement range is 0-800℃, and the probe diameter is 1mm.

[0035] This testing system has 15 temperature measurement points, allowing for temperature measurement at multiple locations. An H2 composition transmitter is used to measure the instantaneous change in hydrogen concentration during the experiment, with a measurement range of 0-100 vol%. The hydrogen concentration test points set for this system are C1 and C2. A hydrogen detector, model XLA-BX-H2, is used to detect the remaining hydrogen gas fraction after the reaction is complete and is a pump-suction type hydrogen detector.

[0036] The working process of the testing system described in this invention, i.e., the testing method, is as follows:

[0037] (1) Start the experiment. Turn on the power to the testing equipment and set the air and hydrogen inlet flow rates on the computer 10 terminal. First, introduce air. Calculate the air inlet time based on the set air inlet flow rate and the volume of the reaction vessel, ensuring the reaction vessel is a sealed, atmospheric pressure environment. Open the mechanical valve and gas flow controller of the air inlet line and record the inlet time using a stopwatch. After the air inlet is complete, close the mechanical valve and air flow controller 7 on the air inlet line and turn on the data acquisition unit 11 to start recording. Open the mechanical valve and hydrogen flow controller 6 on the hydrogen inlet line and obtain different hydrogen gas integrals by controlling the hydrogen inlet time. Observe the temperature and H2 concentration signal trends displayed on the data acquisition unit 11 during the experiment. When the temperature drops to room temperature and the H2 concentration signal no longer changes, the reaction is considered complete. Save the temperature and H2 concentration data. Use a hydrogen detector to detect and record the remaining hydrogen concentration.

[0038] (2) After the experiment, use excess argon gas to vent the remaining hydrogen gas outdoors to prevent hydrogen leakage and accumulation indoors. Close the main valve and pressure reducing valve of air cylinder 8, export the data recorded by data acquisition device 11, and then turn off the power to all test equipment.

[0039] The following are specific embodiments using the above-described testing system and testing methods:

[0040] Example:

[0041] To study the performance testing system for the hydrogen-oxygen catalytic composite reaction catalyst of the present invention, the structure of the above-described testing system was used, and a test was conducted for 10 minutes at a hydrogen gas integral of 4% vol and a flow rate of 1 m / s.

[0042] In this test, air and hydrogen were simultaneously introduced, with the air inlet flow rate set at 2400 mL / min and the hydrogen inlet flow rate at 100 mL / min. The Pt / C catalyst mass was 0.3 g, and the catalyst was positioned in the middle of the reaction vessel. The test results of the five thermocouples located in the middle layer are as follows: Figure 3 As shown in the figure, curves 1-5 represent the test results of the five thermocouples in the middle layer group from left to right. From the above embodiments, it can be concluded that the testing system of the present invention can investigate the performance of the catalyst for the hydrogen-oxygen catalytic composite reaction.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A testing system for the performance of catalysts used in hydrogen-oxygen recombination reactions, characterized in that: The testing system includes a reaction vessel and a hydrogen generator and an air cylinder connected to the reaction vessel via gas pipelines; the reaction vessel is equipped with a mixing plate and a catalyst plate.

2. The testing system for the performance of hydrogen-oxygen complex reaction catalysts according to claim 1, characterized in that: Several catalyst plates are arranged longitudinally from left to right inside the reaction vessel.

3. The testing system for the performance of a hydrogen-oxygen complex reaction catalyst according to claim 1, characterized in that: The reactor has at least 15 temperature measuring points on its side wall, and each temperature measuring point is equipped with a thermocouple.

4. The testing system for the performance of a hydrogen-oxygen complex reaction catalyst according to claim 3, characterized in that: The reaction vessel is equipped with two hydrogen concentration test points, and each hydrogen concentration test point is equipped with a hydrogen composition transmitter.

5. The testing system for the performance of a hydrogen-oxygen complex reaction catalyst according to claim 1, characterized in that: A hydrogen flow controller is installed on the pipe connecting the hydrogen generator and the reaction vessel.

6. The method for preparing the testing system for the performance of hydrogen-oxygen complex reaction catalyst according to claim 5, characterized in that: An air flow controller is installed on the pipe connecting the air bottle and the reaction vessel.

7. The testing system for the performance of a hydrogen-oxygen complex reaction catalyst according to claim 4, characterized in that: Both the thermocouple and the hydrogen composition transmitter are electrically connected to the data acquisition unit.

8. The testing system for the performance of a hydrogen-oxygen complex reaction catalyst according to claim 6, characterized in that: Both the hydrogen flow controller and the air flow controller are electrically connected to the computer.

9. The testing system for the performance of a hydrogen-oxygen complex reaction catalyst according to claim 1, characterized in that: The reaction vessel is a cuboid with a length of 100mm, a width of 50mm, a height of 300mm, and a volume of 1400mL. It is made of synthetic sapphire glass.

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