In-situ photothermal catalytic reaction gas molecule detection device

Abstract

The utility model relates to a kind of in-situ photo-thermal catalytic reaction gas molecule detection devices, including catalytic reactor, the air inlet and the air outlet being set on the outer side wall of catalytic reactor and with the inside communication of catalytic reactor and the laser detection passageway entrance and laser detection passageway exit being respectively set on the front and back two side walls of catalytic reactor, the laser detection passageway entrance is set with laser emission mechanism away from the side of catalytic reactor, the laser detection passageway exit is set with photoelectric detection mechanism away from the side of catalytic reactor, the positive upper side of catalytic reactor is provided with reaction light source. The utility model has the beneficial effect that staff can conveniently monitor the concentration of reaction gas and product gas in catalytic reactor under closed state or flow state in real time.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, specifically to an in-situ photothermal catalytic reaction gas molecule detection device. Background Technology

[0002] In the field of photothermal catalytic CO2 conversion research, gas chromatography (GC) is the mainstream instrument for gas detection. A special syringe is used to precisely measure the gas sample generated by the catalytic reaction and inject it into the detector of the GC. Inside the instrument, the injected gas sample undergoes complex chromatographic separation and detection processes. Only after the entire reaction process is complete can the gas concentration parameters be obtained. Subsequently, the concentration data must be processed according to specific conversion formulas to finally obtain the detection values ​​related to the catalytic reaction results.

[0003] However, this traditional detection method has significant drawbacks. First, because the gas sample requires a certain amount of time to complete the reaction within the instrument, it is impossible to achieve real-time dynamic monitoring of the catalytic reaction process and to capture instantaneous changes in gas concentration during the reaction. Second, this method lacks spatial resolution and cannot accurately detect and analyze the gas composition and concentration at different spatial locations within the catalytic reaction system. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing an in-situ photothermal catalytic reaction gas molecule detection device that enables workers to conveniently monitor the concentrations of reaction gases and product gases in a catalytic reactor under closed or flowing conditions in real time.

[0005] This utility model is achieved through the following technical solution: providing an in-situ photothermal catalytic reaction gas molecule detection device, including a catalytic reactor, an inlet and an outlet disposed on the outer wall of the catalytic reactor and communicating with the interior of the catalytic reactor, and a laser detection path inlet and a laser detection path outlet respectively disposed on the front and rear side walls of the catalytic reactor. A laser emitting mechanism is disposed on the side of the laser detection path inlet away from the catalytic reactor, and a photoelectric detection mechanism is disposed on the side of the laser detection path outlet away from the catalytic reactor. A reaction light source is disposed directly above the catalytic reactor.

[0006] In use, this invention comprises a catalytic reactor, an inlet and an outlet located on the outer wall of the reactor and connected to its interior, and laser detection pathway inlets and outlets located on the front and rear side walls of the reactor. A laser emitting mechanism is located on the side of the laser detection pathway inlet furthest from the reactor, and a photoelectric detection mechanism is located on the side of the laser detection pathway outlet furthest from the reactor. A reaction light source is positioned directly above the reactor. During use, the operator first adds a catalyst to the reactor and then connects the inlet (farthest from the reactor) and outlet (farthest from the reactor) to the reactor. The external gas injection and collection mechanisms are connected, allowing the gas injection mechanism to supply a certain amount of reactant gas into the catalytic reactor through the inlet. Then, by turning on the reaction light source, the catalyst catalyzes the reactant gas to undergo a photothermal catalytic CO2 conversion reaction within the reactor. Next, by controlling the laser emission mechanism, a laser beam is projected into the catalytic reactor through the laser detection path inlet. After absorption by the reactant and product gases, the laser beam exits through the laser detection path outlet to a photoelectric detection mechanism. This laser beam is detected, and the photoelectric detection mechanism generates a spectral signal, thereby enabling the real-time monitoring of the concentrations of reactant and product gases within the catalytic reactor under closed conditions. Real-time monitoring is performed. When the concentration of reactant and product gases in the catalytic reactor is no longer required, the gas is extracted from the reactor through the outlet via the reactant gas collection mechanism. Alternatively, after adding the catalyst to the reactor, the inlet and outlet, located furthest from the reactor, can be connected to an external reactant gas injection mechanism and reactant gas collection mechanism, respectively. The reactant gas injection mechanism continuously supplies gas into the reactor through the inlet, and the reactant gas collection mechanism continuously extracts gas from the reactor through the outlet, thus allowing the reactant gas to circulate within the reactor. During gas flow, by turning on the reaction light source, the catalyst catalyzes the reaction gas to undergo a photothermal catalytic CO2 conversion reaction in the catalytic reactor. Then, by controlling the laser emission mechanism, the laser is injected into the catalytic reactor through the laser detection channel inlet. After being absorbed by the reaction gas and product gas, the laser is emitted through the laser detection channel outlet to the photoelectric detection mechanism. The laser is detected in this way, and the photoelectric detection mechanism generates a spectral signal. This allows for real-time monitoring of the concentration of reaction gas and product gas in the catalytic reactor under flow conditions. This enables personnel to conveniently monitor the concentration of reaction gas and product gas in the catalytic reactor under both closed and flow conditions in real time.

[0007] Preferably, the laser emitting mechanism includes a laser electrically connected to a signal generator and an optical fiber collimator disposed between the laser and the laser detection path inlet. In use, by activating the signal generator and the laser, the laser beam passes through the optical fiber collimator and enters the laser detection path inlet on the catalytic reactor.

[0008] Preferably, the photoelectric detection mechanism includes a signal acquisition card electrically connected to a computer monitor and a photodetector disposed between the laser detection path outlet and the signal acquisition card and electrically connected to the signal acquisition card. In use, the laser emitted from the laser detection path outlet strikes the photodetector for detection. Data is then acquired by the signal acquisition card and displayed on the computer monitor, facilitating real-time monitoring of the concentrations of the reactant gas and product gas.

[0009] Preferably, the reaction light source can be a xenon lamp light source or a laser light source. Using a xenon lamp light source or a laser light source facilitates the photothermal catalytic conversion of the reactant gases into CO2 within the catalytic reactor.

[0010] Preferably, the catalytic reactor includes a blind tube and an annular plate fixed to the outer wall of the blind tube. A sealing ring, closed circumferentially around the blind tube, is provided at the top of the annular plate. A circular plate, abutting against the top of the sealing ring, is positioned above the blind tube. The circular plate and the annular plate are fixed together by a clamping mechanism. In use, by controlling the clamping mechanism to remove it from fixing the circular plate and the annular plate, the circular plate is lifted upwards, thus relieving it from contact with the sealing ring at the top of the annular plate. This facilitates the addition of catalyst into the blind tube.

[0011] Preferably, the top of the blind tube is aligned with the top of the ring plate. Aligning the top of the blind tube with the top of the ring plate facilitates the clamping mechanism in fixing the circular plate and the ring plate.

[0012] Preferably, the clamping mechanism includes a fixing clamp whose two inner sidewalls abut against the top of the circular plate and the bottom plate of the annular plate, respectively. The clamping mechanism, with its two inner sidewalls abutting against the top of the circular plate and the bottom plate of the annular plate, not only facilitates the fixing of the circular plate and the annular plate by the operator, but also allows the circular plate and the annular plate to be de-fixed by controlling and moving the clamp.

[0013] Preferably, the clamping mechanism includes clamps disposed on the outer circumferential surfaces of the circular plate and the annular plate. The clamps not only facilitate the fixing of the circular plate and the annular plate by workers, but also allow the circular plate and the annular plate to be de-fixed by controlling and moving the clamps.

[0014] Preferably, both the laser detection path inlet and outlet are configured as quartz pillars fixed to the outer wall of the blind tube, with a heating band on the outer circumferential surface of the quartz pillar. In use, the heating band heats the quartz pillar, maintaining its temperature at 100°C. This prevents the condensation of H2O generated during the CO2 conversion reaction at the connection between the blind tube and the quartz pillar during photothermal catalysis, which could affect detection.

[0015] Preferably, both the inlet and outlet are configured as connecting pipes fixed to the outer wall of the blind pipe and communicating with the interior of the blind pipe, with valves provided on the outer circumferential surface of the connecting pipes. The valves allow operators to easily open or close the two connecting pipes, thereby allowing the reactant gas to be transported through the inlet into the blind pipe or the gas inside the blind pipe to be transported through the outlet to the outside of the blind pipe.

[0016] The beneficial effects of this utility model are as follows: By setting up a catalytic reactor, an air inlet and an air outlet set on the outer wall of the catalytic reactor and connected to the inside of the catalytic reactor, and laser detection path inlets and outlets respectively set on the front and rear side walls of the catalytic reactor, a laser emitting mechanism is set on the side of the laser detection path inlet away from the catalytic reactor, and a photoelectric detection mechanism is set on the side of the laser detection path outlet away from the catalytic reactor. A reaction light source is set directly above the catalytic reactor. When using the device, the operator can first put the catalyst into the catalytic reactor, and then connect the end of the air inlet away from the catalytic reactor and the end of the air outlet away from the catalytic reactor respectively to the... The external gas injection and collection mechanisms are connected, allowing the gas injection mechanism to supply a certain amount of reactant gas into the catalytic reactor through the inlet. Then, by turning on the reaction light source, the catalyst catalyzes the reactant gas to undergo a photothermal catalytic CO2 conversion reaction within the reactor. Next, by controlling the laser emission mechanism, a laser beam is projected into the catalytic reactor through the laser detection path inlet. After absorption by the reactant and product gases, the laser beam exits through the laser detection path outlet to a photoelectric detection mechanism. This laser beam is detected, and the photoelectric detection mechanism generates a spectral signal, thereby enabling the real-time monitoring of the concentrations of reactant and product gases within the catalytic reactor under closed conditions. Real-time monitoring is performed. When the concentration of reactant and product gases in the catalytic reactor is no longer required, the gas is extracted from the reactor through the outlet via the reactant gas collection mechanism. Alternatively, after adding the catalyst to the reactor, the inlet and outlet, located furthest from the reactor, can be connected to an external reactant gas injection mechanism and reactant gas collection mechanism, respectively. The reactant gas injection mechanism continuously supplies gas into the reactor through the inlet, and the reactant gas collection mechanism continuously extracts gas from the reactor through the outlet, thus allowing the reactant gas to circulate within the reactor. During gas flow, by turning on the reaction light source, the catalyst catalyzes the reaction gas to undergo a photothermal catalytic CO2 conversion reaction in the catalytic reactor. Then, by controlling the laser emission mechanism, the laser is injected into the catalytic reactor through the laser detection channel inlet. After being absorbed by the reaction gas and product gas, the laser is emitted through the laser detection channel outlet to the photoelectric detection mechanism. The laser is detected in this way, and the photoelectric detection mechanism generates a spectral signal. This allows for real-time monitoring of the concentration of reaction gas and product gas in the catalytic reactor under flow conditions. This enables personnel to conveniently monitor the concentration of reaction gas and product gas in the catalytic reactor under both closed and flow conditions in real time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 2 for Figure 1Schematic diagram of part A in the middle; Figure 3 for Figure 2 Schematic diagram of Part B in the middle section; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model; Figure 5 for Figure 4 Schematic diagram of the structure of part C; Figure 6 for Figure 5 Structural perspective view; As shown in the figure: 1. Signal generator, 2. Laser, 3. Fiber optic collimator, 4. Reaction light source, 5. Heating belt, 6. Quartz column, 7. Signal acquisition card, 8. Air inlet, 9. Blind tube, 10. Air outlet, 11. Valve, 12. Photodetector, 13. Computer monitor, 14. Circular plate, 15. Ring plate, 16. Fixing clamp, 17. Clamp, 18. Sealing ring. Detailed Implementation

[0018] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0019] Example 1: like Figures 1-3 The in-situ photothermal catalytic reaction gas molecule detection device of this utility model includes a catalytic reactor, an inlet 8 and an outlet 10 disposed on the outer wall of the catalytic reactor and communicating with the interior of the catalytic reactor, and a laser detection path inlet and a laser detection path outlet respectively disposed on the front and rear side walls of the catalytic reactor. A laser emitting mechanism is disposed on the side of the laser detection path inlet away from the catalytic reactor, and a photoelectric detection mechanism is disposed on the side of the laser detection path outlet away from the catalytic reactor. A reaction light source 4 is disposed directly above the catalytic reactor.

[0020] The laser emitting mechanism includes a laser 2 electrically connected to the signal generator 1 and an optical fiber collimator 3 positioned between the laser 2 and the laser detection path inlet. During operation, activating the signal generator 1 and laser 2 allows the laser to pass through the optical fiber collimator 3 and enter the laser detection path inlet on the catalytic reactor. The photoelectric detection mechanism includes a signal acquisition card 7 electrically connected to a computer monitor 13 and a photodetector 12 positioned between the laser detection path outlet and the signal acquisition card 7 and electrically connected to the signal acquisition card 7. During operation, the laser emitted from the laser detection path outlet strikes the photodetector 12 for detection. Data is then acquired via the signal acquisition card 7 and displayed on the computer monitor 13, facilitating real-time monitoring of the concentrations of reactant and product gases. The reaction light source 4 can be a xenon lamp or a laser source, enabling the catalyst to catalyze the photothermal CO2 conversion reaction within the catalytic reactor. The catalytic reactor includes a blind tube 9 and an annular plate 15 fixed to the outer wall of the blind tube 9. A sealing ring 18, which closes circumferentially around the blind tube 9, is provided at the top of the annular plate 15. A circular plate 14, which abuts against the top of the sealing ring 18, is located above the blind tube 9. The circular plate 14 and the annular plate 15 are fixed together by a clamping mechanism. During use, by controlling the clamping mechanism, the clamping mechanism is deactivated, and the circular plate 14 is raised upwards, thus relieving it from contact with the sealing ring 18 at the top of the annular plate 15. This facilitates the addition of catalyst into the blind tube 9. Aligning the top of the blind tube 9 with the top of the annular plate 15 facilitates the clamping mechanism's fixation of the circular plate 14 and the annular plate 15. The clamping mechanism includes a fixing clamp 16 whose two inner sidewalls abut against the top of the circular plate 14 and the bottom plate of the annular plate 15, respectively. The fixing clamp 16 not only facilitates the fixation of the circular plate 14 and the annular plate 15 by the operator, but also allows the circular plate 14 and the annular plate 15 to be de-fixed by controlling and moving the fixing clamp 16. Both the laser detection path inlet and outlet are set as quartz pillars 6 fixed to the outer sidewall of the blind tube 9. A heating band 5 is provided on the outer circumferential surface of the quartz pillar 6. During use, the heating band 5 heats the quartz pillar 6, maintaining its temperature at 100℃. This prevents the condensation of H2O generated during the CO2 conversion reaction in the area where the blind tube 9 connects to the quartz pillar 6, thus avoiding interference with detection. Both the inlet 8 and the outlet 10 are configured as connecting pipes that are fixed to the outer wall of the blind pipe 9 and communicate with the inside of the blind pipe 9. A valve 11 is provided on the outer circumference of the connecting pipe. The valve 11 allows the staff to easily open or close the two connecting pipes respectively, so that the reaction gas is transported from the inlet 8 to the blind pipe 9 or the gas in the blind pipe 9 is transported to the outside of the blind pipe 9 through the outlet 10.

[0021] Laser 2 and photodetector 12 can be placed on a telescopic rod or lifting platform. By controlling the telescopic rod or lifting platform to move laterally and adjusting the telescopic rod or lifting platform to change the vertical height of laser 2 and photodetector 12, the concentrations of reactant gas and product gas at different locations within the blind tube 9 can be monitored. For the photothermal catalytic CO2 methanation reaction, a 1064 nm laser can be used as the photothermal catalytic source to carry out the CO2 methanation reaction on the catalyst sheet. The laser 2 includes a distributed feedback laser 2 (DFB laser 2) with a center wavelength of 1650.9 nm and a quantum cascade laser 2 (QCL laser 2) with a center wavelength of 4587.5 nm. The DFB laser 2 and QCL laser 2 can be used to detect the reaction products CH4 and CO from the CO2 methanation reaction. The DFB laser 2, with its strong absorption of CH4 at this wavelength, can accurately detect changes in CH4 concentration. The QCL laser 2, with its strong absorption of CO, can be used to accurately monitor CO formation. During detection, the DFB and QCL lasers 2 emit detection laser beams that pass through the reaction gas and interact with the generated CH4 and CO molecules. Molecular absorption of the laser causes changes in the laser signal intensity. Subsequently, a photodetector 12 collects the laser signal after passing through the reaction gas and analyzes it. The blind tube 9, the circular plate 14, and the ring plate 15 are all made of transparent materials (such as quartz), which allows the reaction light source to irradiate the catalyst inside the blind tube 9, so that the catalyst catalyzes the reaction gas to undergo a photothermal catalytic CO2 conversion reaction inside the blind tube 9.

[0022] Combined with appendix Figure 1-3As can be seen, the usage method of this embodiment 1 is as follows: First, the fixing clamp 16 needs to be controlled and moved so that the circular plate 14 and the ring plate 15 are no longer fixed together. Then, the circular plate 14 is raised so that it is no longer in contact with the sealing ring 18 at the top of the ring plate 15. Then, the catalyst is added into the blind tube 9, and the circular plate 14 is controlled to move downward back to the initial position so that the circular plate 14 and the sealing ring 18 at the top of the ring plate 15 are in contact again. Then, the fixing clamp 16 is controlled and moved so that it also moves back to the initial position, and the circular plate 14 and the ring plate 15 are fixed together again. After the operator puts the catalyst into the catalytic reactor, one end of the connecting pipe away from the blind tube 9 and the other end can be connected to the other end of the connecting pipe. One end of a connecting pipe, away from the blind tube 9, is connected to both an external reaction gas injection mechanism and a reaction gas collection mechanism. By controlling valve 11 on one of the connecting pipes, the gas injection mechanism delivers a certain amount of reaction gas into the blind tube 9 via this connecting pipe. Once the required amount of reaction gas enters the blind tube 9, valve 11 on the connecting pipe is controlled to close it, preventing the gas injection mechanism from delivering further reaction gas into the blind tube 9. Then, the blind tube 9 is irradiated by a xenon lamp or laser light source, causing a catalyst to catalyze a photothermal CO2 conversion reaction within the blind tube 9. Finally, a start signal is activated. The generator 1 and laser 2 transmit a laser beam through an optical fiber collimator 3, passing through one of the quartz pillars 6 on the blind tube 9 into the tube 9. After being absorbed by the reactant and product gases, the laser beam exits through another quartz pillar 6 on the blind tube 9 and is detected by a photodetector 12. Data is then collected by a signal acquisition card 7 and displayed on a computer monitor 13, facilitating real-time monitoring of the concentrations of reactant and product gases within the blind tube 9 in a sealed state. When monitoring of the reactant and product gas concentrations is no longer needed, the valve 11 on another connecting pipe is controlled to open the other connecting pipe, allowing the gas collection mechanism to collect the gas from the blind tube 9 through the other connecting pipe. Alternatively, the gas can be extracted by connecting one end of a connecting pipe away from the blind tube 9 and the other end of a connecting pipe away from the blind tube 9 to an external reaction gas injection mechanism and a reaction gas collection mechanism, respectively. By controlling valve 11 on the connecting pipe, the connecting pipe is opened, and the reaction gas injection mechanism continuously supplies reaction gas into the blind tube 9 through one connecting pipe, while the reaction gas collection mechanism continuously extracts gas from the blind tube 9 through the other connecting pipe. This allows the reaction gas to circulate within the blind tube 9. During this circulation, the blind tube 9 is irradiated by a xenon lamp or laser light source, causing the catalyst to catalyze a photothermal CO2 conversion reaction within the blind tube 9. Then, by activating signal generator 1 and laser 2...A laser beam is directed through an optical fiber collimator 3 and into one of the quartz pillars 6 of the blind tube 9. After being absorbed by the reactant and product gases, the laser beam exits through another quartz pillar 6 on the blind tube 9 and is then projected onto a photodetector 12. This process detects the laser beam. Data is then acquired by a signal acquisition card 7 and displayed on a computer monitor 13, allowing for real-time monitoring of the concentrations of reactant and product gases within the blind tube 9 under flowing conditions.

[0023] Example 2: Unlike Embodiment 1, the clamping mechanism includes a clamp 17 disposed on the outer circumferential surface of the circular plate 14 and the annular plate 15. The clamp 17 not only facilitates the worker to fix the circular plate 14 and the annular plate 15, but also allows the circular plate 14 and the annular plate 15 to be no longer fixed by controlling and moving the clamp 17.

[0024] Combined with appendix Figure 4-6As can be seen, the usage method of this embodiment 2 is as follows: First, by controlling and moving the clamp 17, the circular plate 14 and the annular plate 15 are no longer fixed together. Then, the circular plate 14 is raised upwards so that it no longer abuts against the sealing ring 18 at the top of the annular plate 15. Next, the catalyst is added into the blind tube 9, and the circular plate 14 is controlled to move downwards back to its initial position so that the circular plate 14 and the sealing ring 18 at the top of the annular plate 15 abut together again. Then, by controlling and moving the clamp 17, the clamp 17 is also moved back to its initial position, and the circular plate 14 and the annular plate 15 are fixed together again. After the operator puts the catalyst into the catalytic reactor, one end of the connecting pipe away from the blind tube 9 and the other end of the connecting pipe away from the blind tube 9 can be separated. The system is not connected to external reaction gas injection and collection mechanisms. One of the connecting pipes is opened by controlling valve 11, allowing the reaction gas injection mechanism to deliver a certain amount of reaction gas into the blind tube 9. Once the required amount of reaction gas in the blind tube 9 is reached, the connecting pipe is closed by controlling valve 11, preventing the reaction gas injection mechanism from delivering more reaction gas into the blind tube 9. The blind tube 9 is then irradiated with a xenon lamp or laser source, causing the catalyst to catalyze the photothermal CO2 conversion reaction within the blind tube 9. Finally, the signal generator 1 and laser 2 are activated, and the laser light passes through an optical fiber collimator. 3. The laser beam is injected into the blind tube 9 through one of the quartz pillars 6. After being absorbed by the reactant and product gases, the laser beam is emitted through another quartz pillar 6 on the blind tube 9 and onto the photodetector 12 for detection. The data is then collected by the signal acquisition card 7 and displayed on the computer monitor 13. This allows for real-time monitoring of the concentrations of reactant and product gases in the blind tube 9 under sealed conditions. When the concentrations of reactant and product gases in the blind tube 9 are no longer needed, the valve 11 on the other connecting pipe is controlled to open the other connecting pipe, allowing the gas extraction mechanism to draw the gas out of the blind tube 9 through the other connecting pipe. Alternatively, the gas can be extracted by connecting one end of the connecting pipe away from the blind tube 9 to the other connecting pipe. One end of a connecting pipe, away from the blind tube 9, is connected to both an external reaction gas injection mechanism and a reaction gas collection mechanism. By controlling valve 11 on the connecting pipe, the pipe is opened, and the reaction gas injection mechanism continuously supplies reaction gas into the blind tube 9 through one of the connecting pipes. Simultaneously, the reaction gas collection mechanism continuously extracts gas from the blind tube 9 through the other connecting pipe, allowing the reaction gas to circulate within the blind tube 9. During this circulation, the blind tube 9 is irradiated by a xenon lamp or laser light source, causing a catalyst to catalyze a photothermal CO2 conversion reaction within the blind tube 9. Then, by activating signal generator 1 and laser 2, the laser beam passes through fiber optic collimator 3 and is directed into the blind tube 9 through one of the quartz pillars 6.The laser beam is absorbed by the reactant and product gases and then emitted through another quartz column 6 on the blind tube 9 to the photodetector 12 for detection. Data is then acquired via the signal acquisition card 7 and displayed on the computer monitor 13, thus enabling real-time monitoring of the concentrations of reactant and product gases within the blind tube 9 under flowing conditions.

[0025] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. An in-situ photothermal catalytic reaction gas molecule detection device, characterized in that: It includes a catalytic reactor, an air inlet (8) and an air outlet (10) disposed on the outer wall of the catalytic reactor and connected to the interior of the catalytic reactor, and a laser detection path inlet and a laser detection path outlet disposed on the front and rear side walls of the catalytic reactor, respectively. The laser detection path inlet is provided with a laser emitting mechanism on the side away from the catalytic reactor, and the laser detection path outlet is provided with a photoelectric detection mechanism on the side away from the catalytic reactor. A reaction light source (4) is disposed directly above the catalytic reactor.

2. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 1, characterized in that: The laser emitting mechanism includes a laser (2) electrically connected to the signal generator (1) and an optical fiber collimator (3) disposed between the laser and the laser detection path entrance.

3. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 1, characterized in that: The photoelectric detection mechanism includes a signal acquisition card (7) electrically connected to a computer monitor (13) and a photoelectric detector (12) disposed between the laser detection path outlet and the signal acquisition card and electrically connected to the signal acquisition card.

4. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 1, characterized in that: The reaction light source can be set as a xenon lamp light source or a laser light source.

5. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 4, characterized in that: The catalytic reactor includes a blind tube (9) and an annular plate (15) fixed on the outer wall of the blind tube. A sealing ring (18) is provided on the top of the annular plate and closed around the blind tube. A circular plate (14) is provided above the blind tube and abuts against the top of the sealing ring. The circular plate and the annular plate are fixed by a clamping mechanism.

6. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 5, characterized in that: The top of the blind tube is aligned with the top of the ring plate.

7. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 5, characterized in that: The clamping mechanism includes a fixing clamp (16) whose two inner sidewalls at the clamping end respectively abut against the top of the circular plate and the bottom plate of the ring plate.

8. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 5, characterized in that: The clamping mechanism includes clamps (17) disposed on the outer circumferential surfaces of the circular plate and the annular plate.

9. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 4, characterized in that: The laser detection channel inlet and laser detection channel outlet are both set as quartz pillars (6) fixed to the outer wall of the blind tube, and the outer circumferential surface of the quartz pillar is provided with a heating band (5).

10. The in-situ photothermal catalytic reaction gas molecule detection device according to claim 4, characterized in that: Both the air inlet and the air outlet are configured as connecting pipes that are fixed to the outer wall of the blind pipe and communicate with the inside of the blind pipe. A valve (11) is provided on the outer circumferential surface of the connecting pipe.

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