Multifunctional planar catalytic reaction device and method with high light energy utilization rate

Abstract

The invention relates to the technical field of photocatalysis, and provides a multifunctional planar catalytic reaction device and method with high light energy utilization rate. The catalytic reaction device comprises a reaction layer, a light transmitting layer and a temperature control layer, a flow channel is formed in the reaction layer, an opening communicated with the flow channel is formed in one side of the reaction layer, an optical coating film is arranged on the inner wall of the flow channel, and a catalyst is arranged in the flow channel; the light-transmitting layer is arranged on one side of the reaction layer and blocks the opening; the light-transmitting layer is used for enabling incident light with a preset wavelength to enter the flow channel through the opening; and the temperature control layer is arranged on the other side of the reaction layer. The opening is formed in the side wall of the flow channel to introduce incident light, and the high-reflectivity optical coating film is arranged on the inner wall of the flow channel, so that the scattering path of the incident light is effectively prolonged while the reaction device is kept simple in structure and convenient to operate, and the scattered light is reconverged to the surface of a catalyst, so that the recycling of the scattered light can be realized; therefore, the utilization rate of incident light by the reaction device is improved.

Description

Technical Field

[0001] The present invention relates to the field of photocatalysis technology, and in particular to a multifunctional planar catalytic reaction device and method with high light energy utilization rate. Background Art

[0002] Solar energy is the cleanest energy with the widest coverage and longest availability on the earth. The energy reaching the earth every second is equivalent to burning 5 million tons of coal. Therefore, the effective use of solar energy is crucial to the sustainable development of mankind in the future. Photocatalysis, as an important technical means to directly convert solar energy into chemical energy, can directly turn this clean energy into useful chemicals needed by society, and has received widespread attention from the international academic and industrial circles. After decades of research, the photocatalyst material system based on plasmon metal materials, semiconductor materials, organic polymer materials, metal oxide / sulfide materials, metal organic framework (MOF) materials, covalent organic framework (COF) materials, two-dimensional materials (MXene), quantum dot materials, etc. has been established and greatly developed, involving applications including water decomposition to produce hydrogen, carbon dioxide conversion, methane conversion, organic molecule conversion, nitrogen fixation, water pollution control, air purification, etc., covering energy chemical industry, organic chemical industry, agriculture, environmental governance and other fields.

[0003] At present, although certain breakthroughs have been made in the research on photocatalytic theory and system, there are still many problems to be solved in the design of photocatalytic reactors. One of the key issues is that light, as an electromagnetic wave, will inevitably undergo elastic or inelastic scattering when it interacts with the catalyst. For example, the reflection and refraction phenomena we are familiar with. This results in that the light energy that is ultimately absorbed and utilized by the catalyst in a single incident light only accounts for a small part of the total incident energy. Therefore, how to extend the propagation path of light in the reactor so that it interacts with the catalyst multiple times, thereby increasing the proportion of light energy absorbed and utilized, has become an important issue that needs to be urgently solved to improve the energy conversion efficiency of the photocatalytic reactor. Summary of the invention

[0004] The invention provides a multifunctional planar catalytic reaction device with high light energy utilization rate, which is used to solve the problem of low light energy utilization rate in the prior art.

[0005] The present invention provides a multifunctional planar catalytic reaction device with high light energy utilization rate, comprising:

[0006] A reaction layer, wherein a flow channel is disposed inside the reaction layer, an opening communicating with the flow channel is disposed on one side of the reaction layer, an optical coating is disposed on the inner wall of the flow channel, and a catalyst is disposed in the flow channel;

[0007] A light-transmitting layer is disposed on one side of the reaction layer and blocks the opening; the light-transmitting layer is used to allow incident light of a predetermined wavelength to pass through the opening and enter the flow channel;

[0008] The temperature control layer is arranged on the other side of the reaction layer, and the temperature control layer is used to control the temperature inside the reaction layer.

[0009] A multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention also includes:

[0010] The temperature sensor is arranged inside the reaction layer, and is used to detect the temperature inside the reaction layer.

[0011] A multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention also includes:

[0012] A pressure sensor is disposed in the flow channel, and the pressure sensor is used to detect the pressure in the flow channel.

[0013] According to a multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention, a planar concentrator, a photovoltaic power generation sheet or a photothermal conversion element is arranged on the side of the light-transmitting layer away from the reaction layer, and the planar concentrator is used to converge the incident light into the flow channel; the photovoltaic power generation sheet is one or a combination of several of a silicon solar cell, an inorganic salt multi-compound battery, a functional polymer solar cell, and a nanocrystalline solar cell, an electrode assembly is arranged inside the flow channel, and the photovoltaic power generation sheet is electrically connected to the electrode assembly; the photothermal conversion element is used to convert light energy into thermal energy, and the photothermal conversion element is one or a combination of several of a carbon-based photothermal conversion element, a plasmon photothermal conversion element, a semiconductor photothermal conversion element or a polymer photothermal conversion element.

[0014] According to a multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention, the catalyst is one or a combination of metal nanocatalysts, semiconductor nanocatalysts or composite catalysts; the catalyst is coated on the surface of the optical coating, coated on the surface of the electrode assembly, suspended in the reaction raw materials or combined with a carrier to form a composite catalyst, and the carrier is one or a combination of carbon carriers, silica carriers, alumina carriers, ceramic carriers, molecular sieves, silicon carbide, kaolin, fluoropolymers or quartz glass.

[0015] According to a multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention, the material of the optical coating is foamed polytetrafluoroethylene, barium sulfate or metal crystal surface.

[0016] According to a multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention, the flow channel includes a plurality of flow channel units, the plurality of flow channel units are arranged at intervals along the length direction of the reaction layer, each of the flow channel units extends along the width direction of the reaction layer, and the plurality of flow channel units are connected end to end in sequence to form the flow channel; the width of the opening is less than two-thirds of the maximum width of the flow channel cross section.

[0017] According to a multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention, a raw material inlet is provided at one end of the reaction layer, and the raw material inlet is connected to one end of the flow channel; a reaction product outlet is provided at the other end of the reaction layer, and the reaction product outlet is connected to the other end of the flow channel.

[0018] The present invention also provides a multifunctional planar catalytic reaction method with high light energy utilization rate, the method is based on any of the multifunctional planar catalytic reaction devices with high light energy utilization rate described above, comprising:

[0019] The pre-mixed gaseous or liquid reaction materials are continuously or intermittently input into one end of the flow channel at a predetermined flow rate. The reaction materials undergo a catalytic reaction under the action of the catalyst and the incident light, and the reaction products are output from the other end of the flow channel. The temperature inside the reaction layer is controlled by the temperature control layer.

[0020] According to a multifunctional planar catalytic reaction method with high light energy utilization rate provided by the present invention, the light source of the incident light is one or a combination of the sun, a xenon lamp, an LED lamp, a halogen tungsten lamp, a mercury lamp or an infrared lamp, and the light intensity of the incident light is 5mW / cm 2 -4000 mW / cm 2 ; The pressure in the flow channel is 0.1Mpa-10 MPa, and the temperature in the flow channel is 25℃-600℃.

[0021] The multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention introduces incident light by setting an opening on the side wall of the flow channel, and sets an optical coating with high reflectivity on the inner wall of the flow channel. While keeping the reaction device simple in structure and easy to operate, the scattering path of the incident light is effectively extended. By re-converging the scattered light onto the surface of the catalyst, the scattered light can be reused, thereby improving the utilization rate of the incident light by the reaction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0023] Figure 1 is a schematic diagram of a top view of the structure of the first specific embodiment provided by the present invention;

[0024] Figure 2 is a schematic side cross-sectional structural diagram of a first specific embodiment provided by the present invention;

[0025] Figure 3 is a schematic top view of the structure of a second specific embodiment provided by the present invention;

[0026] Figure 4 is a schematic side cross-sectional structural diagram of a second specific embodiment provided by the present invention;

[0027] Figure 5 is a schematic top view of the structure of a third specific embodiment provided by the present invention;

[0028] Figure 6 It is a schematic diagram of the side cross-sectional structure of the third specific embodiment provided by the present invention.

[0029] Reference numerals:

[0030] 1. Light-transmitting layer; 3. Reaction layer; 4. Flow channel; 5. Optical coating; 6. Temperature sensor; 7. Electrode assembly; 8. Temperature control layer; 9. Photovoltaic power generation cell; 10. Photothermal conversion element. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0033] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] Combine the following Figures 1 to 6 It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute any limitation to the present invention.

[0036] like Figure 1 and Figure 2 As shown, the multifunctional planar catalytic reaction device with high light energy utilization rate includes a reaction layer 3, a light-transmitting layer 1 and a temperature-controlling layer 8. A flow channel 4 is arranged inside the reaction layer 3. An opening communicating with the flow channel 4 is arranged on one side of the reaction layer 3. An optical coating 5 is arranged on the inner wall of the flow channel 4. A catalyst is arranged in the flow channel 4. The light-transmitting layer 1 is arranged on one side of the reaction layer 3 and blocks the opening. The light-transmitting layer 1 is used to allow incident light of a predetermined wavelength to enter the flow channel 4 through the opening. The temperature-controlling layer 8 is arranged on the other side of the reaction layer 3 and is used to control the temperature inside the reaction layer 3.

[0037] The multifunctional planar catalytic reaction device with high light energy utilization rate provided by the present invention introduces incident light by setting an opening on the side wall of the flow channel 4, and sets a high-reflectivity optical coating 5 on the inner wall of the flow channel 4. While keeping the reaction device simple in structure and easy to operate, the scattering path of the incident light is effectively extended. By re-focusing the scattered light on the surface of the catalyst, the scattered light can be reused, thereby improving the utilization rate of the incident light by the reaction device.

[0038] In one embodiment of the present invention, the light-transmitting layer 1 is a transparent medium layer that allows incident light of a predetermined wavelength to pass through. The material of the light-transmitting layer 1 is transparent glass, quartz glass, organic glass or ZnSe glass. The light-transmitting layer 1 can also be glass coated with a reflective film or an anti-reflection film, or the glass can be doped to transmit incident light of a specific wavelength (range).

[0039] In one embodiment of the present invention, the multifunctional planar catalytic reaction device with high light energy utilization rate further includes a temperature sensor 6, which is disposed inside the reaction layer 3 and is used to detect the temperature inside the reaction layer 3. One or more temperature sensors 6 may be provided, and the multiple temperature sensors 6 are provided in different areas to detect the temperature values ​​of different areas.

[0040] Furthermore, the temperature sensor 6 is electrically connected to the control device. When the temperature control layer 8 is a resistance wire, the control device is electrically connected to the temperature control layer 8. The control device controls the heating power of the resistance wire according to the temperature value obtained by the temperature sensor 6, so that the temperature inside the reaction layer 3 remains constant, thereby realizing closed-loop control.

[0041] In one embodiment of the present invention, the multifunctional planar catalytic reaction device with high light energy utilization rate further includes a pressure sensor (not shown), which is disposed in the flow channel 4 and is used to detect the pressure value in the flow channel 4. Preferably, the pressure sensor is disposed at the raw material inlet or the reaction product outlet.

[0042] In one embodiment of the present invention, a plane light concentrator (not shown), a photovoltaic power generation sheet 9 or a photothermal conversion element 10 is provided on the side of the light-transmitting layer 1 facing away from the reaction layer 3. The plane light concentrator is used to converge the incident light into the flow channel 4. The shape of the plane light concentrator can be cylindrical, spherical or other shapes. The specific type of the plane light concentrator can be a Fresnel lens or other lenses. Of course, the shape and specific type of the plane light concentrator are not limited thereto, and are specifically determined according to the shape of the flow channel 4 and the light usage range.

[0043] The photovoltaic power generation sheet 9 is one or a combination of silicon solar cells, inorganic salt (such as gallium arsenide III-V compounds, cadmium sulfide, copper indium selenide, etc.) multi-compound cells, functional polymer solar cells, nanocrystalline solar cells, etc., and an electrode assembly 7 is arranged inside the flow channel 4, and the photovoltaic power generation sheet 9 is electrically connected to the electrode assembly 7; the photovoltaic power generation sheet 9 supplies power to the electrode assembly 7 by converting light energy into electrical energy.

[0044] The photothermal conversion element 10 is used to convert light energy into thermal energy to heat the reaction layer 3 and provide heat for the catalytic reaction. The photothermal conversion element 10 is one or a combination of carbon-based photothermal conversion elements, plasmon photothermal conversion elements, semiconductor photothermal conversion elements, or polymer photothermal conversion elements. The photothermal conversion element 10 can be arranged in a variety of ways. The photothermal conversion element 10 can be coated or embedded on the side of the light-transmitting layer 1 away from the reaction layer 3.

[0045] It should be noted here that the planar light concentrator, photovoltaic power generation sheet 9 or photothermal conversion element 10 is located between the two flow channels 4, which effectively solves the problem that part of the original light cannot be used, and further improves the catalytic conversion efficiency of the reaction device; combined with steady-state temperature control to increase the service life of the catalyst and reduce the side reaction rate, high light energy conversion rate and selective catalytic reaction can be finally achieved. The planar catalytic reaction device of the present invention can be used by connecting multiple planar catalytic reaction devices in parallel or in series to form a photocatalytic reaction array for use to meet the needs of industrial production.

[0046] In one embodiment of the present invention, the specific type of the catalyst can be one or a combination of metal nanocatalysts, semiconductor nanocatalysts or composite catalysts. The catalyst is coated on the surface of the optical coating 5, coated on the surface of the electrode assembly 7, suspended in the reaction raw materials or combined with a carrier to form a composite catalyst, and the carrier is one or a combination of carbon carriers, silicon dioxide carriers, aluminum oxide carriers, ceramic carriers, molecular sieves, silicon carbide, kaolin, fluoropolymers or quartz glass.

[0047] It should be noted that the reaction raw materials undergo a photocatalytic reaction in the flow channel 4. Of course, the catalytic reaction can also be an electrocatalytic reaction or a thermal catalytic reaction.

[0048] In one embodiment of the present invention, the optical coating 5 is made of a material with high reflectivity, and the material of the optical coating 5 is foamed polytetrafluoroethylene, barium sulfate or metal crystal surface. The optical coating 5 can make the light reflect multiple times in the flow channel 4, and re-converge the scattered light to the surface of the catalyst, so as to realize the reuse of the scattered light, thereby improving the utilization rate of the incident light by the reaction device. Furthermore, in order to increase the number of scattering times of the incident light in the flow channel 4, the optical coating 5 can be provided with multiple layers to reflect the incident light multiple times.

[0049] In one embodiment of the present invention, the flow channel 4 includes a plurality of flow channel units, and the plurality of flow channel units are arranged at intervals along the length direction of the reaction layer 3, and preferably, the distance between two adjacent flow channel units is equal. Each flow channel unit extends along the width direction of the reaction layer 3, and preferably, the width of each flow channel unit is equal. Of course, the width of each flow channel unit may also be unequal. A plurality of flow channel units are connected end to end in sequence to form the flow channel 4, so that the flow channel 4 is an S-shaped curved flow channel. Such a structural design can increase the movement distance of the reactants in the flow channel 4, increase the reaction time of the reactants, and ensure that the reactants react fully. Of course, the structural form of the flow channel 4 is not limited thereto, and is determined according to specific requirements such as reaction flow rate and heat exchange requirements.

[0050] Furthermore, in order to reduce the resistance encountered by the fluid during its flow in the flow channel 4, two adjacent flow channel units are connected via an arc-shaped flow channel 4, so that in the process of the fluid entering the next flow channel unit from the previous flow channel unit, the resistance encountered by the flow channel 4 is reduced, which can reduce the pressure requirement for the reaction material when entering the flow channel 4.

[0051] The opening extends along the length of the flow channel 4, and the width of the opening is less than two-thirds of the maximum width of the cross section of the flow channel 4. The cross section of the flow channel 4 is circular, elliptical or other shapes. By making the width of the opening less than two-thirds of the maximum width of the cross section of the flow channel 4, the reflected light is reduced from being emitted through the opening while ensuring that the incident light can enter, ensuring that the light can be reflected multiple times in the flow channel 4.

[0052] It should be noted that the length direction of the reaction layer 3 is Figure 1 The left and right directions in the figure, and the width direction of the reaction layer 3 is Figure 1 The up and down directions in .

[0053] In one embodiment of the present invention, a raw material inlet is provided at one end of the reaction layer 3, and the raw material inlet is connected to one end of the flow channel 4, and the reaction material enters the flow channel 4 through the raw material inlet for reaction. A reaction product outlet is provided at the other end of the reaction layer 3, and the reaction product outlet is connected to the other end of the flow channel 4, and the reaction product outlet is used to discharge the reaction product.

[0054] In one embodiment of the present invention, the temperature control layer 8 is used to control the temperature inside the reaction layer 3 to achieve steady-state regulation of the temperature inside the reaction layer 3. The temperature control layer 8 can be an air heat dissipation fin or a solid semiconductor temperature control device, or a channel is provided inside the temperature control layer 8, and a heat transfer medium flows in the channel. The heat transfer medium is water (steam), oil, molten salt or liquid metal, etc. The temperature inside the reaction layer 3 can be controlled by controlling the flow rate and flow of the heat transfer medium; in addition, a resistance wire or the like can also be used in the temperature control layer 8 for heating.

[0055] Combine the following Figure 1 and Figure 2 A specific embodiment of the present invention is described as follows. Figure 1 and Figure 2 As shown, the multifunctional planar catalytic reaction device with high light energy utilization rate includes a reaction layer 3, a light-transmitting layer 1, a temperature-controlling layer 8 and a temperature sensor 6. In this embodiment, the light-transmitting layer 1 is made of quartz glass, the reaction layer 3 is made of stainless steel, and a channel is provided inside the temperature-controlling layer 8, and water is contained in the channel. An electrode assembly 7 is provided inside the flow channel 4, and the electrode assembly 7 includes a working electrode and a counter electrode. The light-transmitting layer 1 is provided on one side of the reaction layer 3, and the opening is blocked; the light-transmitting layer 1 is used to allow incident light of a predetermined wavelength to enter the flow channel 4 through the opening. The temperature-controlling layer 8 is provided on the other side of the reaction layer 3, and the temperature-controlling layer 8 is used to control the temperature inside the reaction layer 3.

[0056] A flow channel 4 is provided inside the reaction layer 3, and the flow channel 4 includes a plurality of flow channel units, and the plurality of flow channel units are arranged at intervals along the length direction of the reaction layer 3, and the distance between two adjacent flow channel units is equal. Each flow channel unit extends along the width direction of the reaction layer 3, and the width of each flow channel unit is equal. A plurality of flow channel units are connected end to end in sequence to form the flow channel 4, and two adjacent flow channel units are connected through the arc flow channel 4. An opening connected to the flow channel 4 is provided on one side of the reaction layer 3, and the opening extends along the length direction of the flow channel 4.

[0057] The inner wall of the flow channel 4 is provided with an optical coating 5, which is a foamed polytetrafluoroethylene coating, and the surface of the foamed polytetrafluoroethylene coating is uniformly coated with a nano Cu metal catalyst. During the reaction, the saturated carbon dioxide aqueous solution is filled into the flow channel 4 of the reaction layer 3, and the surface of the reaction device is irradiated with sunlight. After reacting for 3 hours under the action of the catalyst, the reaction product is collected from the reaction product outlet, and the reaction product is detected by gas chromatography and nuclear magnetic resonance spectroscopy. By adjusting the flow rate of water in the temperature control layer 8, the temperature of the reaction device can be maintained at 40-50°C.

[0058] Using the multifunctional planar catalytic reaction device in this embodiment, the selectivity of the photocatalytic carbon dioxide reduction reaction is 100%, and the CH4 yield is 10-40 μmol g cat –1 h –1 Compared with the conventional photocatalytic reaction device, the multifunctional planar catalytic reaction device with high light energy utilization rate of the present invention has the advantages of being easy to use and simple to operate, and has a higher incident light utilization rate.

[0059] Combine the following Figure 3 and Figure 4 The first specific embodiment of the present invention is described as follows. Figure 3 and Figure 4As shown, the difference from the first specific embodiment is that the material of the reaction layer 3 in this embodiment is polytetrafluoroethylene, and a photovoltaic power generation sheet 9 is arranged on the side of the light-transmitting layer 1 away from the reaction layer 3. The photovoltaic power generation sheet 9 is a monocrystalline silicon solar cell panel, and the photovoltaic power generation sheet 9 is electrically connected to the electrode assembly 7. In this embodiment, the temperature control layer 8 is an air heat dissipation fin.

[0060] The surface of the working electrode is uniformly coated with 1.3% Pt TiO2 nanocatalyst. During the reaction, a 0.1M sulfuric acid aqueous solution flows into the flow channel at a speed of 1.0-5.0mL / min, and a xenon lamp is used as a simulated sunlight light source at 100-400mW / cm 2 The reaction was carried out under the light intensity of , and the reaction product was detected by gas chromatography. The heat was dissipated by air cooling fins, and the temperature of the reaction device was maintained at about 30°C.

[0061] Using the multifunctional planar catalytic reaction device in this embodiment, the yield of H2 obtained by photolysis of water is 0.5-4mmol g cat –1 h –1 Compared with the conventional photocatalytic reaction device, the multifunctional planar catalytic reaction device in this embodiment can convert the incident light that was previously unusable into electrical energy, greatly accelerate the reaction rate of photolysis of water, and has a significantly higher incident light utilization rate.

[0062] Combine the following Figure 5 and Figure 6 Describe the second specific embodiment of the present invention, as Figure 5 and Figure 6 As shown, the difference from the first specific embodiment is that in this embodiment, a photothermal conversion element 10 is arranged on the side of the light-transmitting layer 1 away from the reaction layer 3, and the photothermal conversion element 10 is a carbon fiber photothermal material loaded with nano Au. In this embodiment, the temperature control layer 8 is a resistance wire heating layer.

[0063] The surface of the foamed polytetrafluoroethylene film is evenly coated with an Al2O3 nanocatalyst loaded with 1% Fe. During the reaction, a mixture of CH4 and CO2 with a gas ratio of 1:1 is flowed into the flow channel at a speed of 12.0-48.0 mL / min. A xenon lamp is used as a simulated sunlight light source at 3000-4000 mW / cm 2 The reaction is carried out under a light intensity of , and the reaction product is detected by gas chromatography. The temperature of the reaction device can be maintained at 400 ℃ -450 ℃ by adjusting the flow rate of water in the temperature control layer.

[0064] Using the multifunctional planar catalytic reaction device in this embodiment, the methane dry reforming reaction produces CO and H2 in a ratio of about 1:0.9, with a yield of 1-6 mmol g cat –1 h–1 Compared with the conventional photocatalytic reaction device, the multifunctional planar catalytic reaction device in this embodiment can convert the incident light that could not be used before into heat energy through the photothermal conversion element 10, and transmit it to the inside of the flow channel 4, thereby increasing the temperature value of the flow channel 4. It can reduce the heating energy consumption of the reaction device, and prevent the byproduct H2O from condensing on the inner surface of the quartz glass, which may cause the reaction tube to be blocked, the incident light path to be changed, the catalyst to be deactivated, and other problems, and it has a significantly higher incident light utilization rate.

[0065] The present invention also provides a multifunctional planar catalytic reaction method with high light energy utilization rate, the method is based on the multifunctional planar catalytic reaction device with high light energy utilization rate described in any one of the above embodiments, and the reaction method comprises:

[0066] The pre-mixed gaseous or liquid reaction materials are continuously or intermittently input into one end of the flow channel at a predetermined flow rate. The reaction materials undergo a catalytic reaction under the action of the catalyst and the incident light, and the reaction products are output from the other end of the flow channel. The temperature inside the reaction layer is controlled by the temperature control layer.

[0067] In one embodiment of the present invention, the light source of the incident light is one or a combination of the sun, a xenon lamp, an LED lamp, a halogen tungsten lamp, a mercury lamp or an infrared lamp, and the light intensity of the incident light is 5 mW / cm 2 -4000 mW / cm 2 ; The pressure in the flow channel is 0.1Mpa-10 MPa, and the temperature in the flow channel is 25℃-600℃.

[0068] It should be noted that the technical solutions in various embodiments of the present invention can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present invention.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multifunctional planar catalytic reaction device with high light energy utilization efficiency, characterized in that: include: A reaction layer (3), wherein a flow channel (4) is arranged inside the reaction layer (3), an opening communicating with the flow channel (4) is arranged on one side of the reaction layer (3), an optical coating (5) is arranged on the inner wall of the flow channel (4), and a catalyst is arranged in the flow channel (4); A light-transmitting layer (1) is arranged on one side of the reaction layer (3) and blocks the opening; the light-transmitting layer (1) is used to allow incident light of a predetermined wavelength to pass through the opening and enter the flow channel (4); A temperature control layer (8) is arranged on the other side of the reaction layer (3), and the temperature control layer (8) is used to control the temperature inside the reaction layer (3).

2. The multifunctional planar catalytic reaction device with high light energy utilization rate according to claim 1 is characterized in that: Also includes: A temperature sensor (6) is arranged inside the reaction layer (3), and the temperature sensor (6) is used to detect the temperature inside the reaction layer (3).

3. The multifunctional planar catalytic reaction device with high light energy utilization rate according to claim 1 is characterized in that: Also includes: A pressure sensor is arranged in the flow channel (4), and the pressure sensor is used to detect the pressure in the flow channel (4).

4. The multifunctional planar catalytic reaction device with high light energy utilization rate according to any one of claims 1 to 3, characterized in that: A plane light concentrator, a photovoltaic power generation sheet (9) or a photothermal conversion element (10) is arranged on the side of the light-transmitting layer (1) facing away from the reaction layer (3); the plane light concentrator is used to converge incident light into the flow channel (4); the photovoltaic power generation sheet is one or a combination of several of a silicon solar cell, an inorganic salt multi-compound cell, a functional polymer solar cell, and a nanocrystalline solar cell; an electrode assembly (7) is arranged inside the flow channel (4), and the photovoltaic power generation sheet is electrically connected to the electrode assembly (7); the photothermal conversion element is used to convert light energy into thermal energy, and the photothermal conversion element is one or a combination of several of a carbon-based photothermal conversion element, a plasmon photothermal conversion element, a semiconductor photothermal conversion element, or a polymer photothermal conversion element.

5. The multifunctional planar catalytic reaction device with high light energy utilization rate according to claim 4 is characterized in that: The catalyst is one or a combination of metal nanocatalysts, semiconductor nanocatalysts or composite catalysts; the catalyst is coated on the surface of the optical coating (5), coated on the surface of the electrode assembly (7), suspended in the reaction raw materials or combined with a carrier to form a composite catalyst, and the carrier is one or a combination of carbon carriers, silicon dioxide carriers, aluminum oxide carriers, ceramic carriers, molecular sieves, silicon carbide, kaolin, fluoropolymers or quartz glass.

6. The multifunctional planar catalytic reaction device with high light energy utilization rate according to claim 5, characterized in that: The material of the optical coating (5) is foamed polytetrafluoroethylene, barium sulfate or metal crystal surface.

7. The multifunctional planar catalytic reaction device with high light energy utilization rate according to any one of claims 1 to 3, characterized in that: The flow channel (4) comprises a plurality of flow channel units, the plurality of flow channel units are arranged at intervals along the length direction of the reaction layer (3), each of the flow channel units extends along the width direction of the reaction layer (3), and the plurality of flow channel units are connected end to end in sequence to form the flow channel (4); the width of the opening is less than two-thirds of the maximum width of the cross section of the flow channel (4).

8. The multifunctional planar catalytic reaction device with high light energy utilization rate according to any one of claims 1 to 3, characterized in that: A raw material inlet is provided at one end of the reaction layer (3), and the raw material inlet is connected to one end of the flow channel (4); a reaction product outlet is provided at the other end of the reaction layer (3), and the reaction product outlet is connected to the other end of the flow channel (4).

9. A multifunctional planar catalytic reaction method with high light energy utilization efficiency, the method is based on the multifunctional planar catalytic reaction device with high light energy utilization efficiency according to any one of claims 1 to 8, characterized in that: include: A pre-mixed uniform gaseous or liquid reaction material is continuously or intermittently input into one end of a flow channel (4) at a predetermined flow rate, and the reaction material undergoes a catalytic reaction under the irradiation of a catalyst and incident light, and a reaction product is output from the other end of the flow channel (4), and the temperature inside the reaction layer (3) is controlled by a temperature control layer (8).

10. The multifunctional planar catalytic reaction method with high light energy utilization rate according to claim 9, characterized in that: The light source of the incident light is one or a combination of the sun, xenon lamp, LED lamp, halogen tungsten lamp, mercury lamp or infrared lamp, and the light intensity of the incident light is 5mW / cm 2 -4000 mW / cm 2 ; The pressure in the flow channel is 0.1Mpa-10 MPa, and the temperature in the flow channel is 25℃-600℃.

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