CN209979572U - Catalyst performance evaluation device - Google Patents
Catalyst performance evaluation device Download PDFInfo
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- CN209979572U CN209979572U CN201920765004.7U CN201920765004U CN209979572U CN 209979572 U CN209979572 U CN 209979572U CN 201920765004 U CN201920765004 U CN 201920765004U CN 209979572 U CN209979572 U CN 209979572U
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Abstract
The utility model discloses a catalyst performance evaluation device, which comprises a gas distribution system, a gas mixing system, a reaction system and an analysis system, wherein the gas distribution system, the gas mixing system, the reaction system and the analysis system are sequentially connected from upstream to downstream along a gas circuit; the air distribution system comprises at least one air source, wherein an air suction pump for sucking air is arranged at an inlet of the air source, and an air source valve is arranged at an outlet of the air source; the air mixing system comprises an air mixing cylinder, and an air mixing fan is arranged in the air mixing cylinder; an inlet pipeline of the reaction system is provided with a circulating pump, the pipeline is divided into a blank gas path and a reaction gas path through an inlet three-way valve, the reaction gas path is provided with a catalytic module, the blank gas path and the reaction gas path are converged into an outlet pipeline of the reaction system through an outlet three-way valve, and the inlet side of the inlet three-way valve and the outlet side of the outlet three-way valve are both provided with organic matter sensors; the analysis system comprises a mass spectrometry and chromatography workstation.
Description
Technical Field
The utility model relates to a catalyst field, especially a catalyst performance evaluation device.
Background
At present, the problem of indoor environmental pollution is serious, and the photocatalysis technology is a purification technology which is very popular in the years and can treat organic pollutants in the air. The photocatalysis technology means that under the condition of illumination, the semiconductor catalyst can thoroughly degrade indoor air pollutants into carbon dioxide and water, and the reaction condition is mild. In recent years, the development and research development of the catalyst in the aspect of photocatalytic air purification are rapid, but most of the existing testing devices adopt high-purity gas cylinders for gas distribution, so that the cost is high, the pipelines are complex, and the testing results are deviated from the real environment. In addition, most of the catalyst evaluation devices extract a certain amount of gas at regular time to perform off-line analysis and detection, so that the experimental error is large, the experimental precision is influenced, and the purpose of accurately evaluating the performance of the catalyst cannot be achieved.
Therefore, the utility model is especially provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a catalyst evaluation device that is fit for real environment especially air purification performance.
In order to achieve the above object, the utility model provides a catalyst performance evaluation device, catalyst performance evaluation device includes gas distribution system, gas mixing system, reaction system and analytic system, and gas distribution system, gas mixing system, reaction system and analytic system set gradually the connection along the gas circuit from upstream to downstream;
the air distribution system comprises at least one air source, an air pump for pumping air is arranged at an inlet of the air source, and an air source valve is arranged at an outlet of the air source;
the air mixing system comprises an air mixing cylinder, and an air mixing fan is arranged in the air mixing cylinder;
an inlet pipeline of the reaction system is provided with a circulating pump, the pipeline is divided into a blank gas path and a reaction gas path through an inlet three-way valve, the reaction gas path is provided with a catalytic module, the blank gas path and the reaction gas path are converged into an outlet pipeline of the reaction system through an outlet three-way valve, and the inlet side of the inlet three-way valve and the outlet side of the outlet three-way valve are both provided with organic matter sensors;
the analysis system comprises a mass spectrometry and chromatography workstation.
Preferably, the mixing cylinder is a transparent glass cylinder.
Preferably, a temperature sensor and a humidity sensor are further arranged in the mixing cylinder.
Preferably, a mass flow meter is further arranged at the inlet pipeline of the reaction system.
Preferably, the catalytic module comprises a reaction tube, a reaction frame and a light source, the reaction tube is connected to the pipeline through a micro-reactor joint arranged at two ends of the reaction tube, the reaction frame is sleeved outside the reaction tube, and the light source is arranged inside the reaction frame.
Preferably, the reaction tube is a quartz tube.
Preferably, the catalytic module further comprises a radiator, and the radiator is arranged on the outer side of the reaction frame and at a position corresponding to the light source installation position.
The utility model provides a catalyst performance evaluation device has following beneficial effect:
the common organic solvent is used as an air source, the organic gas is blown out in an air bubbling mode, the air distribution is simple, different organic matters only need to change the organic solvent in the gas storage cylinder, and the operation is convenient. A plurality of gas sources can be used for realizing the configuration of organic gas with different components and different concentrations;
the concentration of the organic matter is monitored by adopting a sensor, and the concentration change of the organic matter is monitored on line in real time in the process of carrying out the photocatalytic reaction, so that compared with the traditional off-line sampling detection method, the experimental error is reduced, and the evaluation accuracy is improved;
the adsorption performance and the photocatalytic performance of the catalyst can be detected; when the airflow passes through the photoreaction module and the light source is turned off, the adsorption performance of the catalyst can be tested; the photocatalytic performance of the catalyst can be tested under the illumination condition;
the influence of factors such as light source, light intensity, humidity and flow velocity on the catalytic efficiency of the catalyst can be researched, the photocatalytic reaction kinetics can be researched, and the real-time, high-precision and objective evaluation on the performance of the photocatalyst can be realized.
Drawings
Fig. 1 is the utility model provides a catalyst performance evaluation device schematic structure.
Fig. 2 is a schematic structural diagram of a catalytic module in the catalyst performance evaluation apparatus provided by the present invention.
Fig. 3 shows the result of the test of the adsorption performance of titanium oxide P25 on formaldehyde in the present invention.
Fig. 4 shows the result of the photocatalytic performance test of the titanium oxide P25 on formaldehyde in the embodiment of the present invention.
In the figure:
1. the system comprises a gas distribution system 11, a gas source 12, a suction pump 13, a gas source valve 2, a gas mixing system 21, a gas mixing cylinder 22, a gas mixing fan 3, a reaction system 31, a mass flow meter 32, a circulating pump 33, a blank gas path 34, a reaction gas path 35, a catalytic module 351, a reaction tube 352, a micro-reactor joint 353, a reaction frame 354, a light source 355, a radiating fin 356, a cooling fan 4 and an analysis system
Detailed Description
Referring to fig. 1-2, the present invention provides a catalyst performance evaluation device.
The catalyst performance evaluation device comprises a gas distribution system 1, a gas mixing system 2, a reaction system 3 and an analysis system 4, wherein the gas distribution system 1, the gas mixing system 2, the reaction system 3 and the analysis system 4 are sequentially connected from upstream to downstream along a gas path.
Gas distribution system 1 includes at least one air supply 11, and every air supply 11 corresponds a component in the reaction gas, when containing multiple organic matter in the reaction gas, then adopts a plurality of air supplies 11, consequently, the utility model discloses it is right the quantity of air supply 11 does not do specifically and restricts, and the skilled in the art can select according to actual need.
The gas source 11 is a closed container for containing organic reagents, a pipeline serving as a gas source inlet is provided with a suction pump 12, the pipeline is communicated to the bottom end of the closed container, and fresh air is pumped into the gas source 11 through the suction pump 12 to blow out gas containing organic matters. An air source valve 13 is arranged at an outlet of the air source 11, and the concentration of the gas containing the organic matters blown out can be adjusted by adjusting the air pump 12 and the air source valve 13.
If a plurality of gas sources 11 are adopted, the gas containing organic matters generated by each gas source is converged through one or more paths and is introduced into the gas mixing system 2.
The gas mixing system 2 comprises a gas mixing cylinder 21, a gas mixing fan 22 is arranged in the gas mixing cylinder 21, and when the gas containing organic matters enters the gas mixing cylinder 21, the gas mixing fan 22 is started to uniformly mix the gas containing organic matters in the gas mixing cylinder 21.
In this embodiment, the mixing cylinder 21 is a transparent glass cylinder so as to observe the real-time status in the cylinder.
Further, a temperature sensor and a humidity sensor (not shown) are provided in the air mixing cylinder 21 to monitor the state of the air in the cylinder and improve the evaluation accuracy.
An inlet pipeline of the reaction system 3 extends into the mixing cylinder 21 and is internally provided with a circulating pump 32 and a mass flow meter 31, the pipeline is divided into a blank gas path 33 and a reaction gas path 34 through an inlet three-way valve, the reaction gas path 34 is provided with a catalytic module 35, the blank gas path 33 and the reaction gas path 34 are converged into an outlet pipeline of the reaction system through an outlet three-way valve, and the inlet side of the inlet three-way valve and the outlet side of the outlet three-way valve are respectively provided with an organic matter sensor 36.
In this embodiment, the catalyst module 35 includes a reaction tube 351, a reaction frame 353, and a light source 354.
The reaction tube 351 is connected to a pipeline through the micro-reactor joint 352 provided at both ends of the reaction tube 351 so that the reaction tube 351 can be conveniently disassembled to add a catalyst thereto while ensuring sealing performance. The reaction frame 353 is sleeved outside the reaction tube 351 and is used for fixing the light source 354 irradiating the reaction tube 351.
In this embodiment, the reaction tube 351 is a quartz tube, the reaction frame 353 is assembled by a polished aluminum plate, and the light source 354 is fixed to the inner side of the reaction frame 353. The polished aluminum plate is favorable for light to be reflected back and forth in the reaction frame so as to fully utilize the light source.
The intensity of the light from the light source 354 can be adjusted by adjusting the voltage and current of the power source used for the light source.
Further, a heat sink is disposed outside the reaction frame 353 corresponding to the light source 354 to prevent the light source from overheating, and in this embodiment, the heat sink is a heat sink 355 having a cooling fan 3565.
The outlet pipeline of the reaction system 3 is connected with an analysis system 4.
In the present invention, the analysis system 4 includes a mass spectrometer and a chromatography workstation. For analyzing the contents of the respective components in the gas passing through the reaction system.
The following will further explain the method of using the catalyst performance evaluation apparatus provided by the present invention with reference to specific use examples.
50mg of P25 titanium oxide powder is weighed and put into a quartz tube with the diameter of 8mm, two ends of the quartz tube are fixed by quartz wool, and the quartz tube is connected into a reaction gas circuit. A three-way valve in the reaction system is tangential to a gas mixing gas circuit, an air pump and a valve of a formaldehyde gas generating bottle are opened, and the configured concentration is 0.5mg/m3When the reading of the inlet sensor is 0.5, the air pump is closed. When the readings of the inlet and outlet sensors are consistent, the gas mixing is uniform, the flow rate is stable, and the air pump and the valve are closed. A three-way valve in a reaction system is tangential to a reaction gas circuit, organic matters are adsorbed on the surface of a catalyst after passing through the catalyst, the reading of an outlet sensor is reduced, and when the reading of the outlet sensor is stable, adsorption-desorption balance is indicated. The light source is turned on, and the formaldehyde is degraded by P25 under the illumination condition. In the testing process, the sensor works continuously to monitor the concentration change of the organic matters in the gas circuit on line in real time.
The results of the adsorption performance test of titanium oxide P25 on formaldehyde are shown in fig. 3, and the results of the photocatalytic performance test of titanium oxide P25 on formaldehyde are shown in fig. 4.
The utility model provides a catalyst performance evaluation device and method can adopt ordinary organic solvent to do the air supply, blows off organic gas through the mode of air tympanic bulla, and the distribution is simple, and different organic matters only need change organic solvent in the gas bomb, convenient operation. A plurality of gas sources can be used for realizing the configuration of organic gas with different components and different concentrations;
the concentration of the organic matter is monitored by adopting a sensor, and the concentration change of the organic matter is monitored on line in real time in the process of carrying out the photocatalytic reaction, so that compared with the traditional off-line sampling detection method, the experimental error is reduced, and the evaluation accuracy is improved;
the adsorption performance and the photocatalytic performance of the catalyst can be detected; when the airflow passes through the photoreaction module and the light source is turned off, the adsorption performance of the catalyst can be tested; the photocatalytic performance of the catalyst can be tested under the illumination condition;
the influence of factors such as light source, light intensity, humidity and flow velocity on the catalytic efficiency of the catalyst can be researched, the photocatalytic reaction kinetics can be researched, and the real-time, high-precision and objective evaluation on the performance of the photocatalyst can be realized.
The present invention has been described in detail with reference to specific embodiments, and the description of the embodiments is only for the purpose of helping understanding the core idea of the present invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The catalyst performance evaluation device is characterized by comprising a gas distribution system, a gas mixing system, a reaction system and an analysis system, wherein the gas distribution system, the gas mixing system, the reaction system and the analysis system are sequentially connected from upstream to downstream along a gas path;
the air distribution system comprises at least one air source, an air pump for pumping air is arranged at an inlet of the air source, and an air source valve is arranged at an outlet of the air source;
the air mixing system comprises an air mixing cylinder, and an air mixing fan is arranged in the air mixing cylinder;
an inlet pipeline of the reaction system is provided with a circulating pump, the pipeline is divided into a blank gas path and a reaction gas path through an inlet three-way valve, the reaction gas path is provided with a catalytic module, the blank gas path and the reaction gas path are converged into an outlet pipeline of the reaction system through an outlet three-way valve, and the inlet side of the inlet three-way valve and the outlet side of the outlet three-way valve are both provided with organic matter sensors;
the analysis system comprises a mass spectrometry and chromatography workstation.
2. The catalyst performance evaluation apparatus according to claim 1, characterized in that the mixing cylinder is a transparent glass cylinder.
3. The catalyst performance evaluation apparatus according to claim 1, wherein a temperature sensor and a humidity sensor are further provided in the mixing cylinder.
4. The catalyst performance evaluation apparatus according to claim 1, wherein a mass flow meter is further provided at an inlet line of the reaction system.
5. The catalyst performance evaluation device according to claim 1, wherein the catalytic module comprises a reaction tube, a reaction frame, and a light source, the reaction tube is connected to the pipeline through a microreactor joint arranged at both ends of the reaction tube, the reaction frame is sleeved outside the reaction tube, and the light source is arranged inside the reaction frame.
6. The catalyst performance evaluation apparatus according to claim 5, wherein the reaction tube is a quartz tube.
7. The catalyst performance evaluation apparatus according to claim 5, wherein the catalyst module further comprises a heat sink provided outside the reaction frame at a position corresponding to a light source mounting position.
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| CN201920765004.7U CN209979572U (en) | 2019-05-24 | 2019-05-24 | Catalyst performance evaluation device |
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| CN201920765004.7U CN209979572U (en) | 2019-05-24 | 2019-05-24 | Catalyst performance evaluation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045057A (en) * | 2019-05-24 | 2019-07-23 | 北京北大明德科技发展有限公司 | Catalyst performance evaluation device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045057A (en) * | 2019-05-24 | 2019-07-23 | 北京北大明德科技发展有限公司 | Catalyst performance evaluation device and method |
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