Carbon dioxide photocatalytic reduction device

Abstract

The utility model provides a carbon dioxide photocatalytic reduction device which comprises a shell, the glass tube is arranged in the shell; the xenon lamp light source assembly is arranged in the glass tube, and one end of the xenon lamp light source assembly is connected with the control box; and the glass beads are uniformly coated with a catalyst, the glass beads are all located between the glass tube and the shell, and gas or liquid is injected into the space between the glass tube and the shell through the bottom of the shell, passes through the glass beads and then is output from the upper portion of the shell. The carbon dioxide photocatalytic reduction device disclosed by the utility model is simple in structure, convenient to maintain, high in material yield and wide in application prospect.

Description

Technical Field

[0001] This utility model relates to the field of carbon capture, utilization and storage technology, and in particular to a carbon dioxide photocatalytic reduction device. Background Technology

[0002] Massive carbon dioxide emissions have caused severe ecological problems, including global warming and sea-level rise, impacting Earth's climate conditions in unprecedented ways. Global awareness of the need for carbon neutrality has spurred research into carbon capture, utilization, and storage (CCDS) technologies. Converting carbon dioxide into valuable resources is considered the most promising approach to mitigating the crisis.

[0003] Currently, photocatalytic reduction of carbon dioxide has attracted widespread attention, and its basic reaction systems are divided into two types: liquid-solid and gas-solid. In the liquid-solid system, the catalyst solid powder is dispersed in a carbon dioxide-saturated aqueous solution, and the reaction occurs at the interface between the liquid and the solid catalyst. In the gas-solid system, the catalyst is fixed inside the reaction device, and the reaction occurs at the interface between the gas and the solid catalyst. The liquid-solid system is more widely used due to its easy control of reaction conditions, high efficiency, and suitability for large-scale processing. However, existing carbon dioxide photocatalytic reduction devices suffer from problems such as low light utilization efficiency, small reaction contact area, difficulty in detecting gaseous products, and low yield. Utility Model Content

[0004] This utility model application provides a carbon dioxide photocatalytic reduction device to solve the problems existing in related technologies. The technical solution is as follows:

[0005] This application provides a carbon dioxide photocatalytic reduction device, comprising:

[0006] case;

[0007] A glass tube, wherein the glass tube is disposed within the housing;

[0008] A xenon lamp light source assembly, wherein the xenon lamp light source assembly is disposed inside the glass tube;

[0009] A number of glass microspheres are uniformly coated with a catalyst. The glass microspheres are located between the glass tube and the shell. Gas or liquid is injected between the glass tube and the shell through the bottom of the shell, and after passing through the glass microspheres, it is output from the top of the shell.

[0010] In one implementation,

[0011] The housing has an air inlet, an air outlet, a liquid inlet, and a liquid outlet. The liquid inlet and the air inlet are both located at the bottom of the housing, and the liquid outlet and the air outlet are both located at the top of the housing.

[0012] In one implementation, it further includes:

[0013] A gas detection component is disposed on the housing, the gas detection component is located above the liquid outlet, and the gas detection component is located below the gas outlet.

[0014] In one implementation, it further includes:

[0015] A gas distribution plate is disposed on the housing, located above the liquid inlet and the air inlet, and below the glass tube. Gas or liquid enters between the glass tube and the housing through the gas distribution plate.

[0016] Specifically, the aperture of the gas distribution plate is usually designed to be on the order of micrometers or millimeters, and the aperture size is kept consistent to ensure that the flow velocity is similar when the gas passes through, thus avoiding the generation of high-speed airflow in the large aperture area.

[0017] Because the gas pressure inside the reactor is higher in the central region and lower in the periphery, the gas distribution plate will set the pore density to gradually increase from the center to the edge according to the pressure gradient, reducing the phenomenon of concentrated gas flow and making the airflow evenly distributed on the entire plate surface.

[0018] When gas passes through the gas distribution plate, the channels will create a certain resistance to the gas, resulting in a pressure drop.

[0019] A larger pressure drop can reduce local gas velocity, forcing the gas velocity to become more uniform across the channels of a gas distribution plate, thus reducing localized high-speed airflow. The pressure drop can be controlled by adjusting the orifice size, plate thickness, and pore density, resulting in more uniform airflow. Thicker gas distribution plates or microporous structures typically increase the pressure drop, improving gas distribution.

[0020] In one implementation,

[0021] The gas distribution plate has several tiny through holes.

[0022] In one implementation, it further includes:

[0023] A control box, which is mounted on the housing.

[0024] In one implementation,

[0025] The xenon lamp light source assembly is coaxially arranged with the glass tube.

[0026] In one implementation, it further includes:

[0027] A cover body is disposed on the glass tube.

[0028] In one implementation,

[0029] The housing is made of stainless steel, and the inner surface of the housing is coated with a reflective inert layer.

[0030] In one implementation,

[0031] The shell is cylindrical and can be connected and fixed by a connecting mechanism to achieve series connection.

[0032] Specifically, the connection mechanism may include flange bolts, quick-connect clamps, threaded couplings, or flow guide sleeves, etc., to achieve series fixation, with its core being the integration of sealing connection and fluid flow guidance. The connection mechanism ensures airtightness and leak-free liquid transmission between series units through methods such as flanges and gaskets, clamps and elastic sealing rings, internal and external threads with sealant, or interference fits with flow guide sleeves.

[0033] The advantages or beneficial effects of the above technical solutions include at least the following:

[0034] By placing several glass microspheres between the shell and the glass tube, the reaction contact area is increased, which can significantly improve the mass transfer efficiency. At the same time, the glass microspheres can also help disperse the airflow and ensure that the reactants pass through the reaction device uniformly.

[0035] The above overview is for illustrative purposes only and is not intended to be limiting in any way. Further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description

[0036] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0037] Figure 1 This is a schematic diagram of the structure of this utility model;

[0038] In the picture:

[0039] 100. Reaction apparatus;

[0040] 110. Shell; 111. Air inlet; 112. Air outlet; 113. Liquid inlet; 114. Liquid outlet;

[0041] 120. Glass tube;

[0042] 130. Xenon lamp light source assembly;

[0043] 140. Glass microspheres;

[0044] 150. Gas detection components;

[0045] 160. Gas distribution plate;

[0046] 170. Control box;

[0047] 180. Cover. Detailed Implementation

[0048] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0049] Figure 1 This diagram illustrates the structure of a carbon dioxide photocatalytic reduction device 100 according to an embodiment of this application. Figure 1 As shown, the reaction apparatus 100 may include:

[0050] Casing 110;

[0051] A glass tube 120 is disposed within the housing 110;

[0052] A xenon lamp light source assembly 130 is disposed inside the glass tube 120;

[0053] A plurality of glass microspheres 140 are uniformly coated with a catalyst. The plurality of glass microspheres 140 are located between the glass tube 120 and the housing 110. Gas or liquid is injected into the space between the glass tube 120 and the housing 110 through the bottom of the housing 110, and after passing through the plurality of glass microspheres 140, it is output from the top of the housing 110.

[0054] In this embodiment, the reaction device 100 is first filled with glass microspheres 140, the catalyst is coated on the glass microspheres 140, and the glass microspheres 140 are dispersed inside the fixed bed reaction device 100 to increase the contact area between the liquid and the inner surface of the reaction device 100, so that the reactants can fully contact the photocatalyst when they flow through.

[0055] The surface of the glass microspheres 140 is uniformly coated with a catalyst (BiOBr / TCPP), which serves as both a carrier and a dispersant.

[0056] Liquid and gas (carbon dioxide) are introduced into the housing 110. After the delivery is completed, the bottom of the housing 110 is sealed, the xenon lamp light source assembly 130 is turned on, and the photocatalytic reaction process begins. Under the action of the photocatalyst, CO2 is adsorbed on the catalyst surface and reduced to one or more simple organic compounds, such as methane and methanol, under the excitation of light.

[0057] The xenon lamp light source assembly 130 includes a xenon discharge lamp and its associated drive, cooling and control system. It uses a high-voltage electric arc to excite xenon gas to produce a continuous broadband light source with a spectral distribution similar to sunlight, which is suitable for exciting photocatalysts.

[0058] The xenon lamp light source assembly 130 is housed within the glass tube 120 and is remotely operated and finely controlled via an external control box 170. This external control box 170 manages parameters such as the xenon lamp's on / off state, light intensity, and operating time, ensuring stable and efficient operation of the light source under various reaction conditions. The control box 170 and the xenon lamp light source assembly 130 are reliably connected via electrical and signal connections, enabling the system to possess flexible control capabilities and a high level of safety.

[0059] By setting a number of glass microspheres 140 between the shell 110 and the glass tube 120, the contact area between the liquid and the inner surface of the reaction device 100 is increased, so that the reactants can fully contact the photocatalyst when flowing through, thereby improving the mass transfer efficiency. At the same time, the glass microspheres 140 can also help disperse the airflow and ensure that the reactants pass through the reaction device 100 uniformly.

[0060] It should be noted that the coated catalyst is BiOBr / TCPP, which is prepared by the following method:

[0061] Equimolar concentrations of bismuth nitrate pentahydrate (Bi(NO3)3·5H2O) (manufacturer: Aladdin) and potassium bromide (KBr) (manufacturer: Maclean) were added to an ethylene glycol solution. After thorough stirring, the solution was transferred to a PTFE-lined stainless steel autoclave. The autoclave was heated at 150–200 °C for 12 h. After washing with deionized water and ethanol, the precipitate was collected to obtain BiOBr. An appropriate amount of BiOBr was dissolved in anhydrous ethanol (1:20, w / v), and a small amount of TCPP (20:1, BiOBr:TCPP, w / w) was added. The mixture was stirred at room temperature for 24 h, and the resulting solid sample was collected by centrifugation. The sample was washed several times with anhydrous ethanol and dried overnight to obtain the catalyst.

[0062] Furthermore, in the photocatalytic process, BiOBr can absorb ultraviolet and visible light from sunlight and generate electron-hole pairs (e- / h+). BiOBr absorbs visible light, exciting electrons to enter the conduction band and react with CO2 to generate reduction products (such as CO and CH4); TCPP promotes electron transfer by providing stable active sites, thereby improving catalytic efficiency.

[0063] Furthermore, the glass tube 120 is a quartz glass tube 120;

[0064] Furthermore, the reaction device 100 does not require catalyst recovery after the reaction, and it can increase the contact area between the liquid and the catalyst, which helps to improve the photocatalytic efficiency.

[0065] like Figure 1 As shown, in one embodiment,

[0066] The housing 110 has an air inlet 111, an air outlet 112, a liquid inlet 113, and a liquid outlet 114. The liquid inlet 113 and the air inlet 111 are both located at the bottom of the housing 110, and the liquid outlet 114 and the air outlet 112 are both located at the top of the housing 110.

[0067] In this embodiment, air (carbon dioxide) is supplied to the reaction device 100 through the air inlet 111, liquid is introduced into the liquid inlet 113 and then the reaction system is sealed, and the gas after the reaction is completed is output through the gas outlet 112.

[0068] like Figure 1 As shown, in one embodiment, it further includes:

[0069] A gas detection component 150 is disposed on the housing 110, the gas detection component 150 is located above the liquid outlet 114, and the gas detection component 150 is located below the gas outlet 112.

[0070] In this embodiment, the gas mixture after the reaction is completed is measured by the gas detection component 150 to determine the composition of the gas, such as the concentration of methane and methanol, to evaluate the efficiency and selectivity of the photocatalytic reaction, and then discharged through the gas outlet 112. Based on the data provided by the gas detection component 150, the operator can adjust the on / off state and light intensity of the light source, the CO2 flow rate, or the atmosphere composition to optimize the yield, content, and purity of the product.

[0071] It should be noted that the gas detection component 150 is a common gas detector on the market, which can be used to detect gas composition and gas flow rate.

[0072] like Figure 1 As shown, in one embodiment, it further includes:

[0073] A gas distribution plate 160 is disposed on the housing 110. The gas distribution plate 160 is located above the liquid inlet 113 and the air inlet 111, and below the glass tube 120. Gas or liquid enters between the glass tube 120 and the housing 110 through the gas distribution plate 160.

[0074] In this embodiment, the height of the gas distribution plate 160 inside the housing 110 is higher than the height of the gas inlet 111. The gas distribution plate 160 is made of porous metal material and has micropores that allow gas to pass through, so as to uniformly distribute carbon dioxide gas on the horizontal surface of the reaction interface.

[0075] like Figure 1 As shown, in one embodiment, it further includes:

[0076] Control box 170, which is mounted on the housing.

[0077] In this embodiment, the control box 170 is used to control the opening and closing, light intensity and timing program of the xenon lamp light source assembly 130, so as to facilitate the opening and closing and light intensity adjustment of the xenon lamp light source assembly 130 according to the actual situation.

[0078] like Figure 1 As shown, in one embodiment,

[0079] The xenon lamp light source assembly 130 is coaxially arranged with the glass tube 120.

[0080] In this embodiment, the xenon lamp light source assembly 130 is located at the center of the glass tube 120, thereby ensuring that the light source of the xenon lamp light source assembly 130 is located at the center and ensuring the uniformity of the light source.

[0081] like Figure 1 As shown, in one embodiment, it further includes:

[0082] A cover 180 is disposed on the glass tube 120.

[0083] In this embodiment, after the xenon lamp light source assembly 130 is placed inside the glass tube 120, the xenon lamp light source assembly 130 is sealed inside the glass tube 120 by the cover 180.

[0084] like Figure 1 As shown, in one embodiment,

[0085] The housing 110 is made of stainless steel, and the inner surface of the housing 110 is coated with a reflective inert layer.

[0086] In this embodiment, by setting a reflective inert layer, external light sources are prevented from shining into the housing 110, thereby ensuring the integrity of the reaction.

[0087] It should be noted that the reflective inert layer is a titanium dioxide (TiO2) coating, which exhibits good light scattering characteristics in the ultraviolet and visible light range. This effectively reflects light not absorbed by the photocatalyst, ensuring that more light energy reaches the catalyst surface. Furthermore, the high refractive index of the TiO2 coating effectively increases light reflection and scattering, optimizing light distribution within the reaction device and improving catalytic efficiency. It also possesses good chemical stability, withstanding extreme conditions such as high temperatures, strong acids, and strong alkalis, and will not corrode or react under long-term use. The TiO2 reflective coating does not directly participate in the catalytic reaction but indirectly promotes catalyst efficiency by improving the effective utilization of light. TiO2 coatings can be prepared using methods such as sol-gel methods, spraying methods, and coating methods.

[0088] like Figure 1 As shown, in one embodiment,

[0089] The housing 110 is cylindrical.

[0090] In this embodiment, the housing 110 is set as a cylinder to ensure that the distance from the light source of the xenon lamp light source assembly 130 to the inner edge of the housing 110 is equal, thus ensuring the uniformity of the light source of the xenon lamp light source assembly 130.

[0091] The functions of each module in each device of this utility model embodiment can be found in the corresponding description in the above method, and will not be repeated here.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0094] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for photocatalytic reduction of carbon dioxide, characterized by, It comprises: a shell; a glass tube arranged in the shell; a xenon lamp light source assembly arranged in the glass tube; a plurality of glass beads, each of which is uniformly coated with a catalyst, and each of which is located between the glass tube and the shell, gas or liquid is injected into the space between the glass tube and the shell through the bottom of the shell, and then output from the top of the shell after passing through the glass beads.

2. The carbon dioxide photocatalytic reduction device according to claim 1, wherein the shell is provided with an air inlet, an air outlet, a liquid inlet and a liquid outlet, the liquid inlet and the air inlet are arranged at the bottom of the shell, and the liquid outlet and the air outlet are arranged at the top of the shell.

3. The device for photocatalytic reduction of carbon dioxide according to claim 2, characterized in that, It further comprises: a gas detection assembly arranged on the shell, which is located above the liquid outlet and below the air outlet.

4. The device for photocatalytic reduction of carbon dioxide according to claim 3, characterized in that, It further comprises: a gas distribution plate arranged on the shell, which is located above the liquid inlet and the air inlet and below the glass tube, and gas or liquid enters the space between the glass tube and the shell through the gas distribution plate.

5. The carbon dioxide photocatalytic reduction device according to claim 4, wherein the gas distribution plate is provided with a plurality of micro-holes.

6. The carbon dioxide photocatalytic reduction device according to claim 1, wherein the xenon lamp light source assembly is coaxially arranged with the glass tube.

7. The device for photocatalytic reduction of carbon dioxide according to claim 1, wherein It further comprises: a control box arranged on the shell.

8. The photocatalytic reduction of carbon dioxide device according to claim 1, wherein, It further comprises: a cover arranged on the glass tube.

9. The carbon dioxide photocatalytic reduction device according to claim 1, wherein the shell is made of stainless steel, and the inner surface of the shell is coated with a reflective inert layer.

10. The carbon dioxide photocatalytic reduction device according to claim 1, wherein the shell is cylindrical and can be fixed by a connecting mechanism.

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