Device for purifying ammonia gas at room temperature

Abstract

The invention discloses a device for purifying ammonia gas at room temperature, and relates to the technical field of air purification devices.The device comprises a shell and a controller, an air inlet is formed in one end of the shell, an air outlet is formed in the other end of the shell, a first fan is arranged in the air inlet, and a second fan is arranged in the air outlet; a filtering device, an ozone generator and a gas reactor are sequentially arranged in the shell in the airflow direction, the gas reactor comprises a first reaction unit and a second reaction unit, and an ozone detector is installed on the shell on the downstream side of the gas reactor and used for detecting the ozone concentration in the shell on the downstream side of the gas reactor. An ammonia gas detector is installed outside the shell, and the first fan, the second fan, the ozone generator, the gas reactor, the ozone detector and the ammonia gas detector are all electrically connected with the controller. The ammonia gas in the air is efficiently removed, meanwhile, secondary pollution of ozone to the environment is avoided, the energy consumption can be reduced, and the service life can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification devices, and in particular to a device for purifying room temperature ammonia. Background Art

[0002] Ammonia is a colorless, corrosive, and toxic gas with a pungent odor. As a nitrogen-containing pollutant, ammonia can irritate the skin and lungs, causing damage and affecting cardiopulmonary function. A certain concentration of ammonia is unavoidable in the air during daily life and industrial production. With socioeconomic development and improved living standards, people are placing higher demands on indoor and outdoor air quality. This shift in demand has led to the emergence of various air purification devices, including ammonia purification units, on the market.

[0003] However, the existing ammonia purification equipment still has the following shortcomings:

[0004] 1. The filter element of the ammonia purifier has a short service life and needs to be replaced frequently;

[0005] 2. Incomplete ozone utilization will cause secondary pollution to the environment;

[0006] 3. The energy consumption caused by the equipment running all the time is high. Summary of the Invention

[0007] The purpose of the present invention is to provide a device for purifying room temperature ammonia to solve the problems existing in the above-mentioned prior art. While efficiently removing ammonia in the air, it avoids secondary pollution of the environment by ozone, reduces energy consumption and prolongs service life.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a device for purifying room-temperature ammonia, comprising a shell and a controller, wherein one end of the shell is provided with an air inlet, and the other end is provided with an air outlet, a No. 1 fan is installed inside the air inlet, and a No. 2 fan is installed inside the air outlet, a filter device, an ozone generator and a gas reactor are sequentially arranged in the shell along the airflow direction, the gas reactor comprises a first reaction unit and a second reaction unit, the first reaction unit and the second reaction unit are arranged in sequence along the airflow direction, the first reaction unit is filled with a silver-based catalyst, the second reaction unit is filled with a cobalt-nickel bimetallic catalyst, and the cobalt-nickel bimetallic catalyst is a nickel-cobalt layered double hydroxide, an ozone detector is installed on the shell on the downstream side of the gas reactor, for detecting the ozone concentration in the shell on the downstream side of the gas reactor, an ammonia detector is installed outside the shell, the No. 1 fan, the No. 2 fan, the ozone generator, the gas reactor, the ozone detector and the ammonia detector are all electrically connected to the controller.

[0010] In one embodiment, the filtering device includes an activated carbon filter, a primary filter, and a HEPA filter sequentially arranged along the airflow direction.

[0011] In one embodiment, the ozone generator is an ultraviolet irradiation ozone generator.

[0012] In one embodiment, universal wheels are installed on the bottom of the housing.

[0013] In one embodiment, a display panel is mounted on the outer surface of the housing, and the display panel is electrically connected to the controller.

[0014] In one embodiment, a push-pull double door is provided on the housing corresponding to the gas reactor.

[0015] In one embodiment, the controller is a single chip microcomputer.

[0016] In one embodiment, the controller is connected to a power cord, and the power cord is provided with a power plug.

[0017] In one embodiment, the silver-based catalyst includes an Al 2 O 3 carrier and metallic silver supported on the Al 2 O 3 carrier.

[0018] In one embodiment, the mass percentage of metallic silver in the silver-based catalyst to the mass percentage of the Al2O3 carrier is 1-2%.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] 1. This invention achieves low-energy operation by integrating an ammonia detector with a controller (i.e., an intelligent control system). When the ambient ammonia concentration detected by the ammonia detector exceeds the system-set ammonia concentration value, the various functional modules of the purification device are automatically activated to purify the air. When the ambient ammonia concentration detected by the ammonia detector is lower than the system-set ammonia concentration value, the system only maintains the ammonia detector in operation, and the remaining modules enter sleep mode.

[0021] 2. The intelligent control of the ammonia detector and controller avoids the long-term operation of the various instrument components inside the device and extends the service life of the device.

[0022] 3. The two catalysts used in the gas reactor can synergistically achieve 100% purification of ammonia and ozone, and completely remove unused ozone, thereby avoiding secondary ozone pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 2 is a front view of a device for purifying room temperature ammonia in an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the internal structure of a device for purifying room temperature ammonia in an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the filtering device in an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the control principle of the device for purifying room temperature ammonia in an embodiment of the present invention;

[0028] Figure 5 This is a comparison chart of NH3 conversion rates;

[0029] Figure 6 This is a comparison chart of N2 selectivity;

[0030] Figure 7 This is a comparison chart of the conversion rate of O3;

[0031] In the figure: 1-controller, 2-ammonia detector, 3-housing, 4-No. 1 fan, 5-air inlet, 6-universal wheel, 7-filter device, 8-ozone generator, 9-first reaction unit, 10-second reaction unit, 11-No. 2 fan, 12-air outlet, 13-ozone detector, 14-UV lamp, 15-power cord, 16-display panel, 17-sliding double door, 18-activated carbon filter, 19-primary filter, 20-HEPA filter. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a device for purifying room temperature ammonia to solve the problems existing in the prior art. While efficiently removing ammonia in the air, it avoids secondary pollution of the environment by ozone, reduces energy consumption, and prolongs service life.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1-Figure 4 As shown, this embodiment provides a device for purifying room temperature ammonia, including a shell 3 and a controller 1. An air inlet 5 is provided at one end of the shell 3, and an air outlet 12 is provided at the other end. The air inlet 5 is arranged on the left side of the shell 3, and the air outlet 12 is arranged on the right side of the shell 3. A first fan 4 is installed inside the air inlet 5, and the model of the first fan 4 can be 4715KL-05W-B50. A second fan 11 is installed inside the air outlet 12, and the model of the second fan 11 can be A3G250-AB00-01. Through the arrangement of the first fan 4 and the second fan 11, an airflow flowing from the air inlet 5 to the air outlet 12 is formed inside the shell 3. A filter device 7, an ozone generator 8 and a gas reactor are sequentially arranged in the shell 3 along the airflow direction. The model of the ozone generator 8 can be 0Z-011. The gas reactor includes a first reaction unit 9 and a second reaction unit 10. The models of the first reaction unit 9 and the second reaction unit 10 can be IQAir GC MultiGas, a first reaction unit 9 and a second reaction unit 10 are arranged in sequence along the airflow direction, the first reaction unit 9 is filled with a silver-based catalyst, and the second reaction unit 10 is filled with a cobalt-nickel bimetallic catalyst, the cobalt-nickel bimetallic catalyst is a nickel-cobalt layered double hydroxide, an ozone detector 13 is installed on the shell 3 on the downstream side of the gas reactor, for detecting the ozone concentration in the shell 3 on the downstream side of the gas reactor (i.e., monitoring the ozone concentration of the gas to be discharged into the environment), the model of the ozone detector 13 can be SPEC Sensors DGS-O3968-035, an ammonia detector 2 is installed outside the shell 3, the model of the ammonia detector 2 can be Aeroqual S500, the No. 1 fan 4, the No. 2 fan 11, the ozone generator 8, the gas reactor, the ozone detector 13 and the ammonia detector 2 are all electrically connected to the controller 1.

[0036] In this embodiment, the housing is square and semi-enclosed.

[0037] In this embodiment, the controller 1 controls the start and stop of the ozone generator, the gas reactor and the ozone detector.

[0038] In this embodiment, the gas outlet of the ozone generator 8 is connected to the gas inlet of the first reaction unit through a pipeline. The ozone generated in the ozone generator 8 is transported to the first reaction unit through the pipeline for reaction.

[0039] In this embodiment, the first reaction unit 9 is filled with a silver-based catalyst. NH3 and O3 react in the first reaction unit 9 under the catalytic action of the silver-based catalyst to produce N2 and H2O. This removes ammonia from ozone. The reaction temperature in the first reaction unit 9 is room temperature (20-30°C).

[0040] In this embodiment, the gas outlet of the first reaction unit 9 is connected to the gas inlet of the second reaction unit 10. After the catalytic oxidation reaction in the first reaction unit 9, the residual ozone and the generated gas products are transported to the second reaction unit 10 through a pipeline.

[0041] In the present invention, the second reaction unit 10 is filled with a cobalt-nickel bimetallic catalyst, which is a nickel-cobalt layered double hydroxide. The second reaction unit 10 is connected in series with the first reaction unit 9. The nickel-cobalt layered double hydroxide in the second reaction unit 10 catalyzes the unreacted ozone in the first reaction unit 9, decomposing it into oxygen.

[0042] like Figure 1 and Figure 2 As shown, in this embodiment, the ozone detector is arranged on the right side of the shell 3.

[0043] In this embodiment, a No. 1 blower is fixedly installed inside the air inlet, forming an airflow channel within the housing. A filter device 7, an ozone generator 8, and a gas reactor are sequentially arranged in the airflow direction along the airflow channel. An ozone detector is installed on the housing downstream of the gas reactor to detect the ozone content in the gas after the reaction in the second reaction unit 10. A No. 2 blower is fixedly installed inside the air outlet.

[0044] like Figure 3 As shown, in this embodiment, the filter device 7 includes an activated carbon filter 18, a primary filter 19, and a HEPA filter 20 arranged in sequence along the airflow direction to achieve graded filtration of the air. In this embodiment, the primary filter can be a 3M Filtrete Pre-Filter produced by 3M Company.

[0045] The present invention uses the monitoring data of the ammonia detector and the intelligent control of the controller, so that the device provided by the present invention does not need to be in a working state at all times, thereby avoiding the filter element from working for a long time and extending the service life of the filter element;

[0046] In this embodiment, the ozone generator 8 is an ultraviolet irradiation type ozone generator. The ozone generator 8 generates ozone by blowing air into it and irradiating it with an ultraviolet lamp 14 .

[0047] In this embodiment, universal wheels 6 are installed at the bottom of the housing 3 to facilitate the movement of the device and provide good flexibility.

[0048] In this embodiment, a display panel 16 is mounted on the outer surface of the housing 3, and the display panel 16 is electrically connected to the controller 1. In this embodiment, the display panel 16 is fixed to the front side of the housing 3. The display panel 16 can display the measured parameters in real time.

[0049] In this embodiment, a push-pull double-opening door 17 is provided on the housing 3 corresponding to the gas reactor to facilitate the loading and replacement of the catalyst. In this embodiment, the push-pull double-opening door 17 is provided on the front side of the housing.

[0050] In this embodiment, the controller 1 is a single chip microcomputer, and the model of the single chip microcomputer 1 may be Microchip PIC18F45K22.

[0051] In an embodiment, the single chip microcomputer is fixedly disposed inside the housing.

[0052] In this embodiment, the controller 1 is connected to a power cord 15 , and the power cord 15 is provided with a power plug.

[0053] In this embodiment, the silver-based catalyst includes an Al2O3 carrier and metallic silver (denoted as Ag / Al2O3) supported on the Al2O3 carrier. The metallic silver is a single substance of silver.

[0054] In this embodiment, the Al2O3 carrier preferably includes γ-Al2O3 and / or α-Al2O3, more preferably γ-Al2O3.

[0055] In this embodiment, in the silver-based catalyst, the percentage of the mass of metallic silver to the mass of the Al2O3 carrier is preferably 1-2%, more preferably 2%.

[0056] In this embodiment, the preparation method of the silver-based catalyst preferably includes the following steps:

[0057] Mixing aluminum oxide powder, water, and water-soluble silver salt to obtain a mixed liquid;

[0058] The mixed liquid is sequentially subjected to solvent removal and drying to obtain a loaded product;

[0059] The supported product is calcined to obtain the silver-based catalyst.

[0060] The present invention mixes alumina powder, water, and a water-soluble silver salt to obtain a mixed liquid. In the present invention, the alumina powder preferably comprises γ-Al2O3 powder and / or α-Al2O3 powder, more preferably γ-Al2O3 powder. The water is preferably deionized water. The water-soluble silver salt is preferably silver nitrate. The mass ratio of the alumina powder to the silver element in the water-soluble silver salt is preferably 10:0.1-0.2, more preferably 10:0.2. The mixing preferably comprises: dispersing the alumina powder in a portion of the water to obtain an alumina dispersion; dissolving the water-soluble silver salt in the remaining water to obtain a silver salt solution; and stirring the alumina dispersion and the silver salt solution. The ratio of the mass of the alumina powder to the volume of the water is preferably 10 g:500 mL. The dispersion is preferably carried out under stirring, preferably at room temperature, for a time of 0.5 to 1 hour. The stirring and mixing is preferably carried out at room temperature, for a time of 1 to 2 hours.

[0061] After obtaining the mixed liquid, the present invention sequentially removes the solvent and dries the mixed liquid to obtain the loaded product. In the present invention, the solvent removal is preferably performed by vacuum rotary evaporation, the temperature of the vacuum rotary evaporation is preferably 75-80°C, and the drying is preferably performed in an oven, the temperature of the drying is preferably 100°C, and the drying time is preferably 12-24 hours.

[0062] After obtaining the supported product, the present invention calcines the supported product to obtain the silver-based catalyst. In the present invention, the calcination is preferably performed in a muffle furnace. The calcination is preferably performed in an air atmosphere. The calcination temperature is preferably 450-500° C., and the calcination time is preferably 2-3 hours.

[0063] In this embodiment, the cobalt-nickel bimetallic catalyst is nickel-cobalt layered double hydroxide (NiCo-LDH). In the present invention, the molar ratio of nickel to cobalt in the nickel-cobalt layered double hydroxide is preferably 2.5 to 3.5:1.

[0064] In this embodiment, the preparation method of nickel-cobalt layered double hydroxide preferably includes:

[0065] mixing a water-soluble nickel salt, a water-soluble cobalt salt and water to obtain a mixed metal salt solution;

[0066] Mix sodium hydroxide, sodium carbonate and water to make an alkaline solution;

[0067] mixing the mixed metal salt solution and an alkaline solution to obtain a mixed solution;

[0068] The pH value of the mixed solution is adjusted to 10-10.5 by using a pH adjuster, and then aged to obtain a reaction liquid;

[0069] The reaction liquid is sequentially subjected to solid-liquid separation, washing and drying to obtain the nickel-cobalt layered double hydroxide.

[0070] The present invention mixes a water-soluble nickel salt, a water-soluble cobalt salt, and water to obtain a mixed metal salt solution. In the present invention, the water-soluble nickel salt is preferably nickel nitrate, and in the embodiment, it can be nickel nitrate hexahydrate. The water-soluble cobalt salt is preferably cobalt nitrate, and in the embodiment, it can be cobalt nitrate hexahydrate. The mass ratio of the water-soluble nickel salt to the water-soluble cobalt salt is preferably 0.0375:0.0125. The water is preferably deionized water, and the ratio of the mass of the water-soluble nickel salt to the volume of the water is preferably 0.0375g:50mL.

[0071] The present invention mixes sodium hydroxide, sodium carbonate, and water to obtain an alkaline solution. In the present invention, the mass ratio of the sodium hydroxide to the sodium carbonate is preferably 3.2:2.65, the water is preferably deionized water, and the mass of the sodium hydroxide to the volume of the water is preferably 3.2g:50mL. The volume of water in the mixed metal salt solution and the volume of water in the alkaline solution are preferably the same.

[0072] After obtaining the mixed metal salt solution and the alkaline solution, the present invention mixes the mixed metal salt solution and the alkaline solution to obtain a mixed solution.

[0073] After obtaining the mixed solution, the present invention uses a pH adjuster to adjust the pH of the mixed solution to 10-10.5, and then ages it to obtain a reaction solution. In the present invention, the pH adjuster is preferably a sodium hydroxide solution. The pH adjuster is preferably added dropwise to the mixed solution, and the pH adjuster is preferably added dropwise for 1-1.5 hours. The aging temperature is preferably room temperature, and the aging time is preferably 4-5 hours.

[0074] After obtaining the reaction liquid, the present invention sequentially performs solid-liquid separation, washing, and drying on the reaction liquid to obtain the nickel-cobalt layered double hydroxide. In the present invention, the solid-liquid separation is preferably performed by suction filtration. The washing is preferably performed on the solid product obtained by the solid-liquid separation. The washing reagent is preferably ethanol, and the washing is preferably performed under suction filtration. The drying is preferably oven drying. The drying temperature is preferably 60-70°C, and the drying time is preferably 12-24 hours.

[0075] like Figure 4As shown, in this embodiment, when the device is connected to a power source, the controller 1 turns on the ammonia detector 2. When the ambient ammonia concentration detected by the ammonia detector 2 exceeds the ammonia concentration value set by the system, the controller 1 controls the No. 1 fan 4, the No. 2 fan 11, the ozone generator 8, the first reaction unit 9, the second reaction unit 10, and the ozone detector 13 to start. The No. 1 fan 4 inside the air inlet 5 blows air into the interior of the housing 3, thereby forming an airflow within the housing 3. The air first passes through the filter device 7, which contains an activated carbon filter 18, a primary filter 19, and a HEPA filter 20. The air first passes through the activated carbon filter 18 to initially absorb odors in the air, and then passes through the primary filter 19 and the HEPA filter 20 to remove impurities in the air. Afterwards, a portion of the air enters the ozone generator 8, where ozone is generated under the irradiation of the ultraviolet lamp 14. The generated ozone enters the gas reactor under the action of wind, while the remaining portion of the air enters the gas reactor directly under the action of wind. The gas reactor contains two reaction units. The first reaction unit 9, loaded with a silver-based catalyst, converts ammonia into nitrogen under the oxidizing action of ozone, achieving the purpose of purifying the ammonia. The second reaction unit 10, loaded with a cobalt-nickel bimetallic catalyst, completely decomposes the incomplete ozone produced by the first reaction unit 9, preventing secondary ozone pollution. Finally, an ozone detector 13 downstream of the gas reactor monitors the gas. If the ozone concentration is below the level that poses a risk to humans, the gas is blown out of the device by the second blower 11. If the ozone concentration exceeds the level that poses a risk to humans, the system will shut down, and all instruments will cease operation.

[0076] The present invention uses a silver-based catalyst and ozone as an oxidant to achieve efficient catalytic oxidation removal of ammonia from air at room temperature. The device for purifying room-temperature ammonia provided by the present invention also integrates an ozone decomposition unit (second reaction unit), which can completely remove unused ozone, thereby avoiding secondary pollution. By combining it with an online ammonia detection system, intelligent process control based on real-time monitoring data is achieved, significantly improving the system's operating efficiency and service life.

[0077] This example studies the catalytic performance of a silver-based catalyst and a cobalt-nickel bimetallic catalyst used in a device for purifying ammonia at room temperature.

[0078] The silver-based catalyst used in this embodiment preferably comprises Ag-Al2O3-γ or Ag-Al2O3-α. Ag-Al2O3-γ comprises a γ-Al2O3 carrier and metallic silver supported on the γ-Al2O3 carrier. Ag-Al2O3-α comprises an α-Al2O3 carrier and metallic silver supported on the α-Al2O3 carrier.

[0079] In this embodiment, the preparation method of Ag-Al2O3-γ is as follows: weigh 10 g of γ-Al2O3 powder, slowly pour it into a beaker filled with 500 mL of deionized water, and stir it at room temperature for 0.5 h to obtain a γ-alumina mixed solution; add a silver nitrate aqueous solution containing 0.2 g of Ag element to the obtained γ-alumina mixed solution, stir it at room temperature for 2 h, and after sufficient stirring and impregnation, transfer it to a vacuum rotary evaporator and dry it at 80°C to remove water. The obtained powder sample is placed in an oven and dried at 100°C for 12 h to obtain γ alumina loaded with active component metal Ag, and then calcined at 500°C in a muffle furnace for 3 h to obtain an Ag-Al2O3-γ catalyst (denoted as 2Ag-Al2O3-γ).

[0080] In this embodiment, the preparation method of Ag-Al2O3-α is as follows: weigh 10 g of α-Al2O3 powder, slowly pour it into a beaker filled with 500 mL of deionized water, and stir it at room temperature for 0.5 h to obtain an α-alumina mixed solution; add an aqueous silver nitrate solution containing 0.2 g of Ag element to the obtained α-alumina mixed solution, stir it at room temperature for 2 h, and after sufficient stirring and impregnation, transfer it to a vacuum rotary evaporator and dry it at 80°C to remove water. The obtained powder sample is placed in an oven and dried at 100°C for 12 h to obtain α-alumina loaded with active component metal Ag, and then calcined at 500°C in a muffle furnace for 3 h to obtain an Ag-Al2O3-α catalyst (denoted as 2Ag-Al2O3-α).

[0081] The catalytic performance of 2Ag-Al2O3-γ and 2Ag-Al2O3-α prepared in this example was studied under the following reaction conditions: 500ppm NH3, 200ppm O3, reaction temperature 30°C, reaction humidity 30%. The NH3 conversion results are shown in Figure 2. Figure 5 As shown, the selectivity results of N2 are as follows Figure 6 As shown. Figure 5 and Figure 6 The results show that the NH3 conversion rate and N2 selectivity of the 2Ag-Al2O3-γ catalyst are better than those of the 2Ag-Al2O3-α catalyst. Therefore, the present invention preferably uses the Ag-Al2O3-γ catalyst.

[0082] The cobalt-nickel bimetallic catalyst used in this embodiment is preferably nickel-cobalt layered double hydroxide, and NiCo-LDH-400 is used as a comparative catalyst.

[0083] In this embodiment, the preparation method of nickel cobalt layered double hydroxide is as follows: weigh 0.0375g of nickel nitrate hexahydrate and 0.0125g of cobalt nitrate hexahydrate, dissolve them in a beaker filled with 50mL of deionized water to make liquid A; weigh 3.2g of sodium hydroxide and 2.65g of sodium carbonate, dissolve them in a beaker filled with 50mL of deionized water to make liquid B; weigh 4g of sodium hydroxide and dissolve them in a beaker filled with 50mL of deionized water to make liquid C; mix liquid A and liquid B in a large beaker, liquid C acts as a buffer solution to regulate the pH value, drop liquid C into a large beaker filled with the mixture of A and B to control the pH value of the solution to 10-10.5, control the titration rate to one and a half hours, and filter after aging for five hours. Filter with ethanol until the precipitate is in the form of a filter cake, transfer the precipitate to a clean beaker, and dry it at 70°C for 24 hours to obtain the NiCo-LDH catalyst.

[0084] In this embodiment, the preparation method of the comparative catalyst NiCo-LDH-400 is as follows: weigh 0.0375g of nickel nitrate hexahydrate and 0.0125g of cobalt nitrate hexahydrate, dissolve them in a beaker filled with 50mL of deionized water to make liquid A; weigh 3.2g of sodium hydroxide and 2.65g of sodium carbonate, dissolve them in a beaker filled with 50mL of deionized water to make liquid B; weigh 4g of sodium hydroxide and dissolve them in a beaker filled with 50mL of deionized water to make liquid C; mix liquid A and liquid B in a large beaker, liquid C acts as a buffer solution to regulate the pH value, and drop liquid C into a large beaker filled with the mixture of A and B to control the pH value of the solution to 10-10.5. The titration rate is controlled for one and a half hours, and after aging for five hours, it is filtered, and ethanol is filtered until the precipitate is in the form of a filter cake. The precipitate is transferred to a clean beaker and dried at 70°C for 24 hours to obtain the NiCo-LDH catalyst. Then, the NiCo-LDH catalyst was calcined in a muffle furnace at 400° C. for 4 h in an air atmosphere to obtain NiCo-LDH-400.

[0085] The catalytic performance of the NiCo-LDH catalyst prepared in this example was studied using NiCo-LDH-400 as a comparative example. The reaction conditions included: 200 ppm O3, reaction temperature 30°C, and reaction humidity 30%. The O3 conversion results were as follows: Figure 7 As shown. Figure 7 The results show that the conversion rate of O3 of NiCo-LDH catalyst is significantly better than that of NiCo-LDH-400 catalyst. Therefore, NiCo-LDH catalyst is more preferably used in the present invention.

[0086] In summary, in this embodiment, the controller is connected to a power cord, and the power cord is provided with a power plug. After the external power supply is connected, the controller turns on the ammonia detector 2. When the ambient ammonia concentration detected by the ammonia detector 2 exceeds the ammonia concentration value set by the controller, the No. 1 fan 4, the No. 2 fan 11, the ozone generator 8, the gas reactor, and the ozone detector 13 controlled by the controller start to start. The No. 1 fan 4 inside the air inlet 5 blows air into the interior of the shell 3, thereby forming an airflow channel. The air first passes through the filter device 7. The filter device 7 is provided with an activated carbon filter 18, a primary filter 19, and a HEPA filter 20 in sequence along the direction of air circulation. Among them, the air first passes through the activated carbon filter 18 to preliminarily absorb the odor in the air, and then passes through the primary filter 19 and the HEPA filter 20 in sequence to remove impurities in the air. Afterwards, a portion of the air enters the ozone generator 8, where ozone is generated under the irradiation of the ultraviolet lamp 14. The generated ozone enters the first reaction unit 9 under the action of wind, and the other portion of the air directly enters the first reaction unit 9 under the action of wind. The first reaction unit 9 is filled with a silver-based catalyst, and ammonia is converted into nitrogen in the first reaction unit 9 under the oxidation action of ozone, thereby achieving the purpose of purifying ammonia; the second reaction unit 10 is filled with the catalyst NiCo-LDH, which completely decomposes the first reaction unit 9 using incomplete ozone, thereby avoiding secondary pollution of the environment by ozone. Finally, the tail gas of the second reaction unit 10 is monitored by the ozone detector 13. If the ozone concentration is lower than the value that causes harm to the human body, the gas is blown out of the device by the No. 2 fan 11; if the ozone concentration exceeds the value that causes harm to the human body, the device for purifying room temperature ammonia provided in this embodiment will stop operating, and all components in the device for purifying room temperature ammonia will stop working. After the shutdown, it is necessary to reset the parameters through the controller, change the ozone output of the ozone generator 8, and / or replace the nickel-cobalt layered double hydroxide in the second reaction unit, and then restart the device.

[0087] In summary, the present invention provides a device for purifying room-temperature ammonia. By optimizing the catalytic material, it achieves efficient removal of ammonia from air while avoiding secondary ozone pollution. By integrating a highly sensitive ammonia detector, an intelligent feedback control system is constructed. The monitoring data generated by the system is used for intelligent applications, reducing energy consumption and extending the service life of the device.

[0088] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A device for purifying room temperature ammonia, characterized in that: It includes a shell and a controller, one end of the shell is provided with an air inlet, and the other end is provided with an air outlet, the inside of the air inlet is installed with a No. 1 fan, and the inside of the air outlet is installed with a No. 2 fan, and the shell is provided with a filter device, an ozone generator and a gas reactor in sequence along the air flow direction, the gas reactor includes a first reaction unit and a second reaction unit, the first reaction unit and the second reaction unit are arranged in sequence along the air flow direction, the first reaction unit is filled with a silver-based catalyst, the second reaction unit is filled with a cobalt-nickel bimetallic catalyst, and the cobalt-nickel bimetallic catalyst is a nickel-cobalt layered double hydroxide, an ozone detector is installed on the shell on the downstream side of the gas reactor, for detecting the ozone concentration in the shell on the downstream side of the gas reactor, an ammonia detector is installed on the outside of the shell, the No. 1 fan, the No. 2 fan, the ozone generator, the gas reactor, the ozone detector and the ammonia detector are all electrically connected to the controller.

2. The device for purifying room temperature ammonia according to claim 1, characterized in that: The filtering device comprises an activated carbon filter, a primary filter and a HEPA filter which are sequentially arranged along the air flow direction.

3. The device for purifying room temperature ammonia according to claim 1, characterized in that: The ozone generator is an ultraviolet irradiation type ozone generator.

4. The device for purifying room temperature ammonia according to claim 1, characterized in that: Universal wheels are installed at the bottom of the shell.

5. The device for purifying room temperature ammonia according to claim 1, characterized in that: A display panel is installed on the outer surface of the shell, and the display panel is electrically connected to the controller.

6. The device for purifying room temperature ammonia according to claim 1, characterized in that: A push-pull double door is provided on the shell corresponding to the gas reactor.

7. The device for purifying room temperature ammonia according to claim 1, characterized in that: The controller is a single chip microcomputer.

8. The device for purifying room temperature ammonia according to claim 1, characterized in that: The controller is connected to a power line, and the power line is provided with a power plug.

9. The device for purifying room temperature ammonia according to claim 1, characterized in that: The silver-based catalyst includes an Al2O3 carrier and metallic silver supported on the Al2O3 carrier.

10. The device for purifying room temperature ammonia according to claim 9, characterized in that: The mass percentage of the metallic silver in the silver-based catalyst to the mass percentage of the Al2O3 carrier is 1-2%.

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