Luminous flux enhanced photo-thermal catalytic reactor

Abstract

The invention discloses a luminous flux enhanced photo-thermal catalytic reactor, and relates to the technical field of energy chemical industry and photo-thermal catalysis. The reactor comprises a barrel, a heating and heat preservation module, a light guide assembly and a temperature measurement assembly. The core light guide assembly adopts a light guide-diameter change-dispersion three-section integrated structure and is vertically inserted into a catalyst bed layer; wherein the dispersion section inserted into the deep position of the bed layer is matched with the transparent anti-adhesion layer by utilizing a light extraction structure on the side wall, so that deep uniform transmission of light energy in the high-stacking-density bed layer and anti-carbon-deposition self-cleaning are realized; and the variable-diameter irradiation section is configured to eliminate a top illumination blind area. A limiting device and a thermocouple protection sleeve are arranged in the device, and through the design of a light reflection coating and a reflection shielding layer, a photon circulation recovery system is constructed, and photo-thermal decoupling monitoring is achieved. The luminous flux density and the space-time yield of the reactor are remarkably improved, and the reactor has excellent fluid mechanical property and long-period operation stability and is suitable for engineering amplification application of gas-solid phase photo-thermal catalytic reaction.

Description

Technical Field

[0001] This invention relates to the field of multiphase catalytic reaction device technology, and in particular to a light flux-enhanced photothermal catalytic reactor that can significantly improve light energy utilization, achieve three-dimensional uniform illumination of the reaction bed, and has anti-carbon deposition function. Background Technology

[0002] Photothermal synergistic catalysis is a technology that utilizes the thermal and photochemical effects generated by solar or artificial light sources to synergistically drive chemical reactions, showing great promise in fields such as CO2 reduction, methane reforming, and degradation of organic pollutants. In gas-solid phase photothermal reaction research, a fixed-bed reactor is the core equipment.

[0003] Existing fixed-bed photothermal reactors typically employ a simple "top-illuminated" structure, where the light source directly illuminates the catalyst bed below through a flat quartz window at the top. However, this traditional structure suffers from the following significant technical bottlenecks: 1. Limited light penetration depth: Most photocatalysts have strong light absorption and scattering characteristics, which means that incident light can often only penetrate to a depth of micrometers to millimeters on the surface of the bed. Most of the catalyst in the lower layer is in the "dark zone" and cannot be photoexcited, only participating in the thermocatalytic reaction, which severely limits the overall space-time yield of the reactor.

[0004] 2. Low light energy utilization: Traditional top-illuminated light spots are usually larger than the cross-section of the catalyst bed, or the light is scattered and lost during transmission. In addition, if an opaque stirring rod or sleeve is simply inserted to introduce light into the interior, a shadow area will be formed on the catalyst surface, further reducing the light efficiency.

[0005] 3. Carbon buildup causing light window failure: In reactions involving hydrocarbons, carbon buildup easily forms on catalysts and reactor walls. If carbon buildup adheres to the surface of light guide components, it will quickly block the light path, causing a rapid decline in reactor performance within a short period of time.

[0006] 4. Temperature Measurement Distortion: To monitor the reaction temperature, thermocouples are typically inserted into the bed. However, under strong light irradiation, directly exposed thermocouple probes will experience a significant temperature rise due to absorption of light radiation, resulting in measured temperatures that are much higher than the actual reaction temperature of the catalyst, thus misleading the analysis of kinetic data.

[0007] Therefore, there is an urgent need to develop a new type of reactor that can achieve deep light energy transmission, eliminate light dead zones, have self-cleaning capabilities, and achieve photothermal decoupling temperature measurement. Summary of the Invention

[0008] To address the problems existing in the above-mentioned calculations, the present invention aims to provide a light flux-enhanced photothermal catalytic reactor, which significantly improves the light flux density and space-time yield of the reactor, possesses excellent hydrodynamic performance and long-term operational stability, and is suitable for the engineering scale-up application of gas-solid phase photothermal catalytic reactions.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A photothermal catalytic reactor with enhanced light flux includes: a reactor body 1 with an inlet 5 and an outlet 6; a heating and insulation module 7 disposed outside the reactor body 1; a light guide assembly 8 vertically mounted on the top of the reactor body 1; and a catalyst bed 9 filled inside the reactor body 1; the lower part of the light guide assembly 8 is inserted into the catalyst bed 9; the light guide assembly 8 is an integrated light-transmitting component with three-dimensional beam splitting function, and includes, in sequence along the light path, a light guide section 8-1, a variable-diameter irradiation section 8-2, and a diffusion section 8-3; the light guide section 8-1 is located at the top of the reactor and is configured to receive a high-flux parallel beam from an external light source; The variable-diameter irradiation section 8-2 is located above the catalyst bed 9, and its cross-sectional area gradually decreases along the optical path. It is configured to have dual optical modulation function, compressing and converging the light beam into the diffusion section 8-3 while radiating part of the light to the top surface of the catalyst bed 9. The diffusion section 8-3 is located inside the catalyst bed 9, and its sidewall is provided with a light scattering structure 8-3-1 for radially guiding light energy into the interior of the catalyst bed 9.

[0010] Preferably, the variable-diameter irradiation section 8-2 is an inverted conical structure, a frustum-shaped structure, or a curved funnel-shaped structure; the large-diameter end of the variable-diameter irradiation section 8-2 is connected to the light guide section 8-1, and the small-diameter end is connected to the diffusion section 8-3. Its sidewall inclination angle is configured to refract the incident light at the edge to cover the upper surface of the catalyst bed 9, thereby compensating for the lack of top illumination caused by the insertion of the light guide component.

[0011] Preferably, the light scattering structure 8-3-1 is a micro / nano structure layer constructed on the sidewall surface of the dispersion section 8-3; the micro / nano structure layer includes at least one of a rough surface formed by sandblasting, corrosion pits formed by chemical etching, and microgroove structures formed by laser processing. The micro / nano structure layer is used to disrupt the total internal reflection condition of light transmission, thereby guiding the converged high-density photons laterally in the radial direction to uniformly irradiate the catalyst deep within the bed.

[0012] Preferably, the dispersion section 8-3 is a slender cylinder that is coaxially inserted into the interior of the catalyst bed 9. To solve the carbon deposition problem, the surface of the dispersion section 8-3 is covered with a transparent anti-adhesion layer 8-3-2. The transparent anti-adhesion layer 8-3-2 is a high-temperature resistant nano-oxide coating, configured to prevent the adhesion of catalyst particles and reaction byproducts.

[0013] Preferably, it also includes a limiting device 16, which is a cylindrical component fixed inside the reactor body 1, surrounding the catalyst bed 9, and used to define the radial boundary of the catalyst bed 9; the limiting device 16 is provided with a reflective coating 17 on the inner wall surface facing the catalyst bed 9.

[0014] Preferably, the bottom of the catalyst bed 9 is provided with an airflow uniform distribution support plate 11, and a plurality of ventilation holes are distributed on the airflow uniform distribution support plate 11. A quartz wool layer 10 with a microporous structure is laid between the airflow uniform distribution support plate 11 and the catalyst bed 9 to support the catalyst and eliminate the pulsation and channeling phenomenon of the intake airflow; the limiting device 16 is pressed on the airflow uniform distribution support plate 11.

[0015] Preferably, the reflective coating 17 is a silver-plated layer, an aluminum-plated layer, or a white alumina ceramic layer.

[0016] Preferably, it also includes a temperature measuring component, which includes a temperature measuring thermocouple 12 inserted from the bottom of the reactor and extending into the catalyst bed 9, and a protective sleeve 12-1 wrapped around the temperature measuring thermocouple; the top end of the protective sleeve 12-1 is located directly below the diffusion section 8-3 of the light guide component 8, and the top surface of the protective sleeve 12-1 is provided with a high reflectivity shielding layer 12-3, and a thermal expansion buffer gap is reserved between the high reflectivity shielding layer 12-3 and the diffusion section 8-3.

[0017] Preferably, the high-reflectivity shielding layer 12-3 is a white alumina ceramic coating, configured to reflect vertical light emitted from the bottom of the diffusion section 8-3 back to the catalyst bed 9.

[0018] Preferably, the top of the reactor body 1 is sealed and fixed to the light guide component 8 by a flange assembly, and the bottom of the reactor body 1 is sealed and connected to the bottom cover by a flange assembly.

[0019] Compared with the prior art, the present invention has the following significant advantages: (1) Construct a three-dimensional light field across the entire area to eliminate blind spots in illumination. Through the synergistic effect of the "variable diameter section refraction supplement" and "diffuse section lateral scattering" of the light guide component, all-round uniform illumination is achieved on the top surface and deep inside of the catalyst bed. This effectively overcomes the problem of limited light penetration depth caused by the strong light absorption characteristics of the catalyst in traditional top-illuminated systems and the top shading defects of insert-type systems, and significantly increases the effective light-receiving volume.

[0020] (2) Enhanced light flux density and edge recovery; the light-gathering effect of the variable diameter section is used to increase the photon density per unit volume; at the same time, the reflective coating on the inner wall of the limiting device is used to reflect the escaped photons from the edge back to the bed. The combination of the two constitutes a highly efficient light energy recycling system, which greatly improves the light energy utilization rate.

[0021] (3) Excellent anti-carbon deposit stability: A transparent anti-adhesion layer is introduced on the surface of the diffusion section of the light guide component. Its low surface energy characteristics suppress the adhesion of carbon deposit precursors, effectively prevent the light transmittance decay caused by "light window blackening", and ensure the stability of the reactor under long-term operation.

[0022] (4) Achieve accurate temperature measurement with photothermal decoupling; The temperature measurement structure of “bottom insertion + top reflection shielding” physically blocks the direct heating of the thermocouple probe by strong light radiation, eliminates radiation error, and ensures that the measured temperature is the true thermodynamic temperature of the catalyst bed.

[0023] (5) Optimized fluid dynamics performance; bottom air intake combined with airflow distribution support plate and quartz wool pad, combined with axisymmetric annular filling structure, ensures that the reaction gas is uniformly distributed in piston flow, effectively suppresses channeling and wall effect, and enhances gas-solid contact efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic cross-sectional view of the overall structure of the light flux-enhanced photothermal catalytic reactor of the present invention.

[0025] Figure 2 This is a schematic diagram comparing the light path transmission principle with and without a light guide component in this invention; the arrows show the refraction and supplementary light on the surface by the variable diameter irradiation section and the lateral scattering of the interior by the diffusion section.

[0026] Figure 3 for Figure 1 A magnified view of the local microstructure of the diffusion section of the central light guide component inserted into the catalyst bed; showing the light scattering structure of the diffusion section and the transparent anti-adhesion layer.

[0027] Figure 4 The image shows a magnified view of the partial structure of the catalyst bed support and the thermocouple at the bottom of the reactor, revealing the details of the reflective shielding of the temperature sensing component.

[0028] Explanation of reference numerals in the attached drawings: 1-Reactor cylinder; 2-First flange; 3-Second flange; 4-First sealing ring; 5-Air inlet; 6-Air outlet; 7-Heating and insulation module; 7-1 Heating resistance wire; 7-2 Insulation fiber cotton; 8-Light guide assembly; 8-1-Light guide section; 8-2-Variable diameter irradiation section; 8-3-Diffusion section; 8-3-1-Light scattering structure; 8-3-2-Transparent anti-adhesion layer; 9-Catalyst bed; 10-Quartz wool layer; 11-Airflow distribution support plate; 12-Temperature measuring thermocouple; 12-1-Protective sleeve; 12-2-Thermocouple probe; 12-3-High reflectivity shielding layer; 13-Third flange; 14-Second sealing ring; 15-Fourth flange; 16-Limiting device; 17-Reflective coating. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1: Overall Mechanical Structure of the Reactor like Figure 1 As shown, a light flux-enhanced photothermal catalytic reactor has the following main structure: a reactor cylinder 1, a heating and insulation module 7 wrapped around the outside of the reactor cylinder 1, a light guide component 8 installed on the top, a catalyst bed 9 filled inside, and a temperature measuring thermocouple 12 inserted from the bottom.

[0031] The reactor cylinder 1 is a straight tubular container made of high-temperature resistant quartz glass, with a circular longitudinal section. An outlet 6 is connected to the upper part of the side wall of the reactor cylinder 1, and an inlet 5 is connected to the lower part of the side wall. The inlet 5 is connected to an external gas source to introduce the reaction gas into the bottom of the reactor; the outlet 6 is connected to an external gas analyzer or collection device to discharge the reaction products. A heating and insulation module 7 is tightly wrapped around the outside of the reactor cylinder 1. The heating and insulation module 7 includes an inner layer of resistance heating wire 7-1 and an outer layer of insulation fiber cotton 7-2, used for temperature-controlled heating of the reaction area inside the reactor cylinder 1, providing the thermal environment required for the photothermal synergistic reaction.

[0032] A first flange 2 and a second flange 3 are provided at the top of the reactor body 1. The first flange 2 and the second flange 3 are fastened together by bolts, and a first sealing ring 4 is provided between them. The first sealing ring 4 is preferably a fluororubber O-ring, which is embedded in the flange groove to achieve an airtight seal between the light guide assembly 8 and the reactor body 1. A third flange 13 and a fourth flange 15 are provided at the bottom of the reactor body 1. The third flange 13 is fixed to the bottom end of the reactor body 1, and the fourth flange 15, as a bottom cover, is bolted to the third flange 13. A second sealing ring 14 is provided between them to seal the bottom opening of the reactor body 1.

[0033] Example 2: Structure and Optical Configuration of the Light Guide Component like Figure 1 and Figure 2 As shown, the light guide component 8 is an integrally formed quartz glass component, which is vertically and coaxially mounted on the central axis of the reactor cylinder 1. The light guide component 8 is divided into a light guide section 8-1, a variable diameter irradiation section 8-2, and a diffusion section 8-3 from top to bottom along the light path propagation direction.

[0034] The light guide section 8-1 is cylindrical, with its upper end extending through the central hole of the first flange 2 to the outside of the reactor to receive parallel light beams emitted by an external light source (such as a xenon lamp). The outer diameter of the light guide section 8-1 matches the inner diameter of the first sealing ring 4 to achieve a sealed fixation.

[0035] The variable-diameter irradiation section 8-2 is located above the catalyst bed 9 and is constructed as an inverted frustum-shaped structure. Its large-diameter end is smoothly connected to the light guide section 8-1, and its small-diameter end is smoothly connected to the diffusion section 8-3. Figure 2 As shown in the optical path trajectory, the variable-diameter irradiation section 8-2 is configured to have dual optical functions: on the one hand, based on the principle of total internal reflection, it compresses and converges the large cross-section light beam transmitted by the light guide section 8-1 and guides it into the diffuse section 8-3 below; on the other hand, based on the principle of refraction, it refracts some of the incident light rays at the edges along the conical sidewall to form a radiated light field covering the top surface of the catalyst bed 9, thereby eliminating the lack of top illumination caused by the insertion of the light guide component 8.

[0036] like Figure 3As shown, the dispersion section 8-3 is a slender cylinder coaxially inserted into the catalyst bed 9. The sidewall surface of the dispersion section 8-3 is constructed with a light scattering structure 8-3-1. The light scattering structure 8-3-1 is a rough surface formed by sandblasting, corrosion pits formed by chemical etching, or a microgroove structure formed by laser processing (such as femtosecond or nanosecond lasers); its surface roughness Ra value is 1.0 μm to 5.0 μm, used to disrupt the total internal reflection condition of light transmission, guiding the converged high-density photons laterally in the radial direction to uniformly irradiate the catalyst deep within the bed. A transparent anti-adhesion layer 8-3-2 is further covered on the surface of the light scattering structure 8-3-1. The transparent anti-adhesion layer 8-3-2 is a nano-oxide coating with a thickness of 50 nm to 200 nm, possessing low surface energy characteristics, configured to allow photon penetration while preventing catalyst particles and carbon deposits from the reaction process from adhering to the surface of the dispersion section 8-3.

[0037] Example 3: Bed support and flow field distribution structure The airflow distribution support plate 11 (a porous sieve plate made of quartz) has several ventilation holes, forming the physical bottom of the entire reaction bed. A quartz wool layer 10 is laid on the upper surface of the airflow distribution support plate 11. The quartz wool layer 10 has a microporous structure, which serves two purposes: firstly, to support the catalyst bed 9 above and prevent catalyst particles from falling off; secondly, as a secondary gas distributor, it rectifies the airflow entering from the inlet 5 into a uniform piston flow, eliminating wall effects and channeling phenomena. A limiting device 16 is provided above the airflow distribution support plate 11 to position the airflow distribution support plate 11 and the catalyst bed 9. The limiting device 16 is preferably a cylindrical sleeve made of high-temperature resistant quartz or stainless steel, with its outer wall tightly fitted to the inner wall of the reactor cylinder 1 and its bottom pressed against the airflow distribution support plate 11. The inner wall of the limiting device 16 (i.e., the surface that directly contacts the catalyst) is polished and coated with a reflective coating 17 (preferably a silver plating layer, an aluminum plating layer, or a white alumina ceramic layer). The light emitted from the diffusion section 8-3 of the light guide component, after penetrating the catalyst bed 9, will have some photons reaching the edge. If there is no limiting device or the limiting device is made of light-absorbing material, these photons will be absorbed and lost by the container wall. In this invention, the limiting device 16 located on the periphery uses its inner wall reflective coating 17 to construct a "ring mirror," reflecting these escaping photons back into the bed, so that the catalyst at the edge can also receive sufficient light, significantly improving the light energy utilization efficiency of the entire bed.

[0038] Example 4: Photothermal Decoupling Temperature Measurement Component like Figure 1 and Figure 4As shown, in order to achieve accurate monitoring of the reaction temperature, the present invention provides a thermocouple 12 inserted at the bottom of the reactor. The thermocouple 12 passes through the central sealing hole of the fourth flange 15, and vertically upward through the airflow distribution support plate 11 and the quartz wool layer 10, with its probe end placed in the central region of the catalyst bed 9.

[0039] The temperature-measuring thermocouple 12 is externally encased in a protective sleeve 12-1. The protective sleeve 12-1 is a closed-top corundum blind tube or a stainless steel blind tube. A high-reflectivity shielding layer 12-3 is provided on the outer surface of the top of the protective sleeve 12-1. The high-reflectivity shielding layer 12-3 is located directly below the bottom end of the diffusion section 8-3 of the light guide assembly 8, with a thermal expansion buffer gap of more than 5 mm reserved between them. The high-reflectivity shielding layer 12-3 is preferably a white alumina ceramic coating, configured to reflect vertical light rays emitted from the bottom end of the diffusion section 8-3 back to the catalyst bed 9, thereby shielding the temperature-measuring thermocouple 12 from direct heating interference by light radiation and ensuring that the temperature measurement data accurately reflects the thermodynamic temperature of the catalyst bed 9.

[0040] Example 5: Working Process When conducting experiments using the reactor described in this invention, firstly, the airflow distribution support plate 11 is horizontally placed at the bottom of the limiting device 16, and a quartz wool layer 10 is evenly laid on the upper surface of the airflow distribution support plate 11. Simultaneously, it is ensured that the temperature measuring thermocouple 12 and its protective sleeve 12-1 have passed through the center of the aforementioned components and are accurately positioned. After the bottom support components are fixed, a measured amount of photothermal catalyst particles are poured from the top of the reactor, filling the cavity enclosed by the limiting device 16 to form a catalyst bed 9. The bottom of the catalyst bed 9 is supported by the quartz wool layer 10, and the sides are constrained by the limiting device 16. Then, the light guide component 8 is inserted from the bottom of the reactor... The top of the reactor is inserted vertically downwards, allowing the diffusion section 8-3 of the light guide assembly 8 to be slowly pushed in and embedded in the center of the catalyst bed 9 until the variable-diameter irradiation section 8-2 is at a predetermined height above the bed. At this point, the first sealing ring 4 is installed, and the first flange 2 and the second flange 3 at the top are locked to complete the seal. Finally, the gas path between the inlet 5 and the outlet 6 is connected, the heating and insulation module 7 is turned on to heat the reaction zone to the predetermined temperature, and the external light source is turned on to introduce light energy through the light guide assembly 8, and the reaction gas is introduced to carry out a photothermal synergistic catalytic reaction. During the reaction, the transparent anti-adhesion layer works continuously to prevent carbon buildup, and the temperature measuring component provides real-time feedback on the actual temperature of the bed. In summary, this invention, through structural optimization and surface functionalization of the light guide assembly, combined with the flow field and temperature measuring design at the bottom, achieves three-dimensional utilization of light energy and precise decoupled measurement of temperature in the photothermal catalytic reaction.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A light flux-enhanced photothermal catalytic reactor, comprising: The reactor cylinder (1) is provided with an air inlet (5) and an air outlet (6). A heating and insulation module (7) is disposed outside the reactor body (1); a light guide assembly (8) is vertically installed on the top of the reactor body (1); and a catalyst bed (9) is filled inside the reactor body (1); characterized in that: the lower part of the light guide assembly (8) is inserted into the catalyst bed (9); the light guide assembly (8) is an integrated light-transmitting component with three-dimensional beam splitting function, and includes, in sequence along the light path direction, a connected light guide section (8-1), a variable diameter irradiation section (8-2), and a diffusion section (8-3); the light guide section (8-1) Located at the top of the reactor, it is configured to receive a high-throughput parallel beam from an external light source; the variable-diameter irradiation section (8-2) is located above the catalyst bed (9), and its cross-sectional area gradually decreases along the optical path direction. It is configured to have dual optical modulation function, compressing and converging the beam into the diffusion section (8-3) while radiating part of the light to the top surface of the catalyst bed (9); the diffusion section (8-3) is located inside the catalyst bed (9), and its sidewall is provided with a light scattering structure (8-3-1) for radially exporting light energy into the interior of the catalyst bed (9).

2. The light flux-enhanced photothermal catalytic reactor according to claim 1, characterized in that: The variable-diameter irradiation section (8-2) is an inverted cone-shaped structure, a frustum-shaped structure, or a curved funnel-shaped structure; the large-diameter end of the variable-diameter irradiation section (8-2) is connected to the light guide section (8-1), and the small-diameter end is connected to the diffusion section (8-3). Its sidewall inclination angle is configured to refract the incident light at the edge to cover the upper surface of the catalyst bed (9).

3. The light flux-enhanced photothermal catalytic reactor according to claim 1, characterized in that: The light scattering structure (8-3-1) is a micro-nano structure layer constructed on the sidewall surface of the diffusion section (8-3); the micro-nano structure layer includes at least one of the following: a rough surface formed by sandblasting, corrosion pits formed by chemical etching, and microgroove structure formed by laser processing.

4. The light flux-enhanced photothermal catalytic reactor according to claim 1, characterized in that: The dispersion section (8-3) is a slender cylinder that is coaxially inserted into the interior of the catalyst bed (9). The surface of the dispersion section (8-3) is covered with a transparent anti-adhesion layer (8-3-2). The transparent anti-adhesion layer (8-3-2) is a high-temperature resistant nano-oxide coating, configured to prevent the adhesion of catalyst particles and reaction byproducts.

5. The light flux-enhanced photothermal catalytic reactor according to claim 1, characterized in that: It also includes a limiting device (16), which is a cylindrical component fixed inside the reactor body (1) and surrounds the catalyst bed (9) to define the radial boundary of the catalyst bed (9); the limiting device (16) has a reflective coating (17) on the inner wall surface facing the catalyst bed (9).

6. The light flux-enhanced photothermal catalytic reactor according to claim 5, characterized in that: The catalyst bed (9) is provided with an airflow distribution support plate (11) at the bottom. The airflow distribution support plate (11) has several ventilation holes. A quartz wool layer (10) with a microporous structure is laid between the airflow distribution support plate (11) and the catalyst bed (9). The limiting device (16) is pressed on the airflow distribution support plate (11).

7. The light flux-enhanced photothermal catalytic reactor according to claim 5, characterized in that: The reflective coating (17) is a silver plating layer, an aluminum plating layer, or a white alumina ceramic layer.

8. The light flux-enhanced photothermal catalytic reactor according to claim 1, characterized in that: It also includes a temperature measuring component, which includes a temperature measuring thermocouple (12) inserted from the bottom of the reactor and extending into the catalyst bed (9) and a protective sleeve (12-1) wrapped around the temperature measuring thermocouple; the top of the protective sleeve (12-1) is located directly below the diffusion section (8-3) of the light guide component (8), and the top surface of the protective sleeve (12-1) is provided with a high reflectivity shielding layer (12-3), and a thermal expansion buffer gap is reserved between the high reflectivity shielding layer (12-3) and the diffusion section (8-3).

9. The photothermal catalytic reactor with enhanced light flux according to claim 8, characterized in that: The high-reflectivity shielding layer (12-3) is a white alumina ceramic coating, configured to reflect vertical light emitted from the bottom of the diffusion section 8-3 back to the catalyst bed (9).

10. The light flux-enhanced photothermal catalytic reactor according to claim 1, characterized in that: The top of the reactor body (1) is sealed and fixed with the light guide assembly (8) by a flange assembly, and the bottom of the reactor body (1) is sealed and connected with the bottom cover by a flange assembly.

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