Preparation method of photo-thermal catalyst TbYbCeO2 and application of photo-thermal catalyst TbYbCeO2 in condensation catalytic dry reforming

Abstract

The invention relates to the technical field of photo-thermal catalysts, in particular to a preparation method of a photo-thermal catalyst TbYbCeO2 and application of the photo-thermal catalyst TbYbCeO2 in condensation catalytic dry reforming, and the preparation method comprises the following steps: S1, adding cerium nitrate hexahydrate and chitosan into deionized water to obtain a first mixed solution; s2, continuing to add polyethylene glycol, formaldehyde, urea and polyvinylpyrrolidone into the first mixed solution obtained in the step S1 to obtain a second mixed solution; s3, continuously adding citric acid into the second mixed solution obtained in the step S2 to obtain a third mixed solution; s4, terbium nitrate hexahydrate, ytterbium nitrate hexahydrate and absolute ethyl alcohol are continuously added into the third mixed solution obtained in the step S3, and a fourth mixed solution is obtained; s5, performing centrifugal separation to obtain a crude product; and S6, treating the crude product to obtain the photo-thermal catalyst TbYbCeO2. According to the invention, TbYbCeO2 is successfully synthesized, and the TbYbCeO2 has a good application prospect in condensation catalytic dry reforming and is beneficial to utilization of resources.

Description

Technical Field

[0001] The present invention relates to the technical field of photothermal catalysts, and in particular to a method for preparing a photothermal catalyst TbYbCeO2 and its application in concentrated photocatalytic dry reforming. Background Art

[0002] Solar energy has significant advantages such as being clean, safe, inexhaustible and inexhaustible, but it has the problem of uneven temporal and spatial distribution, making it basically impossible to obtain the maximum solar energy reception effect for stable photothermal conversion utilization.

[0003] Methane dry reforming can convert two greenhouse gases, methane and carbon dioxide, into synthesis gas, which can then be converted into high-quality fuels and platform chemicals such as methanol and long-chain hydrocarbons through Fischer-Tropsch synthesis. It is of great significance to alleviate the shortage of liquid fuels in my country and help achieve the "dual carbon" goal. However, the traditional photothermal catalytic methane dry reforming reaction mainly uses electricity to provide light and heat energy, so that the reaction temperature is above 600°C to drive the dry reforming reaction. This process is not only energy-intensive and not conducive to economic benefits, but the consumed electricity may also cause secondary pollution to the environment. In addition, traditional solar reactors also have problems such as unstable concentration efficiency, instantaneous fluctuations in solar heat sources leading to unstable reactions and low conversion rates. Low-temperature methane dry reforming reactions involving solar energy can effectively reduce energy consumption and reduce the maintenance costs of electrical components. The system can achieve full-spectrum and sustainable utilization of solar energy without an external heat source.

[0004] The reaction temperature of traditional photothermal catalytic methane dry reforming is higher than 600℃, which requires high temperature conditions. However, in the northwest of my country, the area is vast and the sunlight is insufficient, so the traditional high-temperature dry reforming reaction cannot be achieved, and it is not suitable for areas with insufficient sunlight. Therefore, the development of 400~500℃ methane dry reforming reaction can effectively realize the full utilization of solar energy resources in the northwest. If a new type of photothermal catalyst can be developed, which can use solar energy resources to realize low-temperature catalysis of photothermal catalysts, it will be possible to maximize the use of sunlight in the northwest region and obtain high-energy product synthesis gas. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing a photothermal catalyst TbYbCeO2 and its application in concentrated photocatalytic dry reforming to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A method for preparing a photothermal catalyst TbYbCeO2 comprises the following steps: S1, adding cerium nitrate hexahydrate and chitosan into deionized water, stirring and mixing to obtain a first mixed solution; S2, adding polyethylene glycol, formaldehyde, urea and polyvinyl pyrrolidone to the first mixed solution obtained in step S1, heating to 90-110° C., reacting for 5-12 hours, to obtain a second mixed solution; S3, continue to add citric acid to the second mixed solution obtained in step S2, adjust the pH to 3-4.5, cool to 60-80°C and react for 1-3h to obtain a third mixed solution; S4, continuing to add terbium nitrate hexahydrate, ytterbium nitrate hexahydrate and anhydrous ethanol to the third mixed solution obtained in step S3, raising the temperature to 180-220° C. and reacting for 10-13 hours to obtain a fourth mixed solution; S5, centrifuging the fourth mixed solution obtained in step S4 to obtain a crude product; S6. The crude product obtained in step S5 is placed in a muffle furnace for calcination, and then ground. The ground product is washed with a sufficient amount of washing liquid, and finally vacuum dried to obtain the photothermal catalyst TbYbCeO2.

[0007] Furthermore, in step S1, the mass ratio of cerium nitrate hexahydrate, chitosan and deionized water is 1:(1.2-2.2):(8.5-14.6).

[0008] Furthermore, the mass ratio of polyethylene glycol, formaldehyde, urea and polyvinyl pyrrolidone in step S2 to chitosan in step S1 is 1:(0.1-0.3):(0.08-0.2):(0.2-0.9):(2.5-3.4).

[0009] Furthermore, the mass ratio of the anhydrous ethanol, terbium nitrate hexahydrate and ytterbium nitrate hexahydrate in step S4 to the cerium nitrate hexahydrate in step S1 is (6.2-12.3):(0.03-0.15):(0.08-0.2):1.

[0010] Furthermore, in step S6, the calcination temperature in the muffle furnace is 400-550° C., the calcination time is 2-4 hours, and the vacuum drying temperature after the product is washed is 50-80° C.

[0011] Furthermore, the cleaning solution in step S6 is a mixture of anhydrous ethanol and deionized water, and the volume ratio between the anhydrous ethanol and the deionized water is 1:2.

[0012] The photothermal catalyst TbYbCeO2 prepared by the above-mentioned preparation method of the photothermal catalyst TbYbCeO2 is used in concentrated photocatalytic dry reforming.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses cerium nitrate hexahydrate, terbium nitrate hexahydrate and ytterbium nitrate hexahydrate as raw materials, and successfully synthesizes the photothermal catalyst Tb / Yb / CeO2 by hydrothermal method under mild conditions through reasonable reaction conditions and material ratios. The synthesis method is not only low-cost, but also the prepared catalyst can achieve efficient catalytic reaction (in the catalytic dry reforming of methane) under the condition of 400-500°C, reducing the dependence on traditional energy; methane and carbon dioxide are converted into synthesis gas under normal pressure by using concentrated photocatalytic technology. The catalytic process of the entire process consumes almost no non-renewable energy and can convert greenhouse gases, which is fully in line with the development trend of green chemical industry. In addition, the preparation method and application process of the catalyst show significant environmental friendliness, reduce the burden on the environment, and promote the development of the chemical industry in a green and efficient direction; 2. The photothermal catalyst Tb / Yb / CeO2 synthesized by the present invention can effectively absorb the wide spectrum of sunlight, improve the utilization rate of light energy, and thus enhance the photothermal conversion efficiency. The photothermal synergistic effect eliminates the necessity of high temperature. Light irradiation increases the generation of oxygen vacancies and electron transfer, promotes the decomposition of reactants, and significantly improves the reaction efficiency. The metal Tb and Yb structures introduced into the material act as electron acceptors, providing a good transmission channel for local electrons near metal defects, promoting the redistribution and migration of free electrons, and further stabilizing the metal defect structure; 3. In the present invention, when the photothermal catalyst Tb / Yb / CeO2 is formed, chitosan and polyethylene glycol are introduced into the entire reaction solution. The chitosan and polyethylene glycol are cross-linked and combined with the cerium oxide first generated in the hydrothermal reaction process. The cerium oxide is evenly distributed to prevent excessive aggregation of the subsequently formed photothermal catalyst Tb / Yb / CeO2. At the same time, the pH of the solution is adjusted by citric acid, and the positive charge of chitosan is utilized to prevent the subsequently introduced ytterbium ions and terbium ions from combining with the cross-linked product. In addition, citric acid can adjust the cerium oxide, allowing the terbium ions and ytterbium ions to combine with the cerium oxide in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a process flow chart of the present invention; Figure 2 X-ray diffraction patterns of the photothermal catalysts Tb / Yb / CeO2 and the catalyst CeO2 prepared in Example 1 and Comparative Example 4 of the present invention; Figure 3 It is a transmission electron microscope image of the CeO2 catalyst of Comparative Example 4 of the present invention; Figure 4 This is a transmission electron microscope image of the photothermal catalyst TbYbCeO2 in Example 1 of the present invention; Figure 5A comparison chart of the ultraviolet-visible light absorption spectra of the photothermal catalyst Tb / Yb / CeO2 and the catalyst CeO2 prepared in Example 1 of the present invention and Comparative Example 4; Figure 6 This is a diagram showing the change in catalyst surface temperature of the photothermal catalyst Tb / Yb / CeO2 of Example 1 of the present invention under different concentrated light intensities. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figures 1 to 6 , the present invention provides: Example 1 A method for preparing a photothermal catalyst TbYbCeO2 comprises the following steps: S1, adding 13 g of cerium nitrate hexahydrate and 23.4 g of chitosan to 156 g of deionized water, stirring and mixing to obtain a first mixed solution; S2, adding 9.4 g of polyethylene glycol, 1.4 g of formaldehyde, 1.8 g of urea and 3.5 g of polyvinyl pyrrolidone to the first mixed solution obtained in step S1, heating to 95° C., reacting for 10 hours, to obtain a second mixed solution; S3, continue to add citric acid to the second mixed solution obtained in step S2, adjust the pH to 3.5, cool to 65°C and react for 2.5h to obtain a third mixed solution; S4, adding 0.65 g of terbium nitrate hexahydrate, 1.9 g of ytterbium nitrate hexahydrate and 120 g of anhydrous ethanol to the third mixed solution obtained in step S3, heating to 200° C. and reacting for 12 hours to obtain a fourth mixed solution; S5, centrifuging the fourth mixed solution obtained in step S4 to obtain a crude product; S6. The crude product obtained in step S5 is placed in a muffle furnace and calcined at 500° C. for 3 hours, and then ground for 3 hours. The ground product is cleaned with a cleaning solution consisting of anhydrous ethanol and deionized water in a sufficient volume ratio of 1:2, and finally vacuum dried at 65° C. to obtain the photothermal catalyst TbYbCeO2.

[0017] Example 2 A method for preparing a photothermal catalyst TbYbCeO2 comprises the following steps: S1, adding 13 g of cerium nitrate hexahydrate and 15.6 g of chitosan to 110.5 g of deionized water, stirring and mixing to obtain a first mixed solution; S2, adding 4.68 g of polyethylene glycol, 0.46 g of formaldehyde, 0.94 g of urea and 1.56 g of polyvinyl pyrrolidone to the first mixed solution obtained in step S1, heating to 90° C., reacting for 5 hours, to obtain a second mixed solution; S3, continue to add citric acid to the second mixed solution obtained in step S2, adjust the pH to 3, cool to 60° C. and react for 1 h to obtain a third mixed solution; S4, adding 0.39 g of terbium nitrate hexahydrate, 1.04 g of ytterbium nitrate hexahydrate and 80.6 g of anhydrous ethanol to the third mixed solution obtained in step S3, heating to 180° C. and reacting for 10 hours to obtain a fourth mixed solution; S5, centrifuging the fourth mixed solution obtained in step S4 to obtain a crude product; S6. The crude product obtained in step S5 is placed in a muffle furnace and calcined at 400° C. for 2 h, and then ground for 2 h. The ground product is cleaned with a cleaning solution consisting of anhydrous ethanol and deionized water in a sufficient volume ratio of 1:2, and finally vacuum dried at 50° C. to obtain the photothermal catalyst TbYbCeO2.

[0018] Example 3 A method for preparing a photothermal catalyst TbYbCeO2 comprises the following steps: S1, adding 13 g of cerium nitrate hexahydrate and 28.6 g of chitosan to 189.8 g of deionized water, stirring and mixing to obtain a first mixed solution; S2, adding 17.2 g of polyethylene glycol, 2.86 g of formaldehyde, 2.86 g of urea and 8.58 g of polyvinyl pyrrolidone to the first mixed solution obtained in step S1, heating to 110° C., reacting for 12 h, to obtain a second mixed solution; S3, continue to add citric acid to the second mixed solution obtained in step S2, adjust the pH to 4.5, cool to 80° C. and react for 3 hours to obtain a third mixed solution; S4, adding 1.95 g of terbium nitrate hexahydrate, 2.6 g of ytterbium nitrate hexahydrate and 160 g of anhydrous ethanol to the third mixed solution obtained in step S3, heating to 220° C. and reacting for 13 h to obtain a fourth mixed solution; S5, centrifuging the fourth mixed solution obtained in step S4 to obtain a crude product; S6. The crude product obtained in step S5 is placed in a muffle furnace and calcined at 550° C. for 4 hours, and then ground for 4 hours. The ground product is cleaned with a cleaning solution consisting of anhydrous ethanol and deionized water in a sufficient volume ratio of 1:2, and finally vacuum dried at 80° C. to obtain the photothermal catalyst TbYbCeO2.

[0019] Example 4 A method for preparing a photothermal catalyst TbYbCeO2 comprises the following steps: S1, adding 13g of cerium nitrate hexahydrate and 25g of chitosan into 165g of deionized water, stirring and mixing to obtain a first mixed solution; S2, adding 11.2 g of polyethylene glycol, 1.4 g of formaldehyde, 1.8 g of urea and 4.4 g of polyvinyl pyrrolidone to the first mixed solution obtained in step S1, heating to 105° C., reacting for 8 hours, to obtain a second mixed solution; S3, continue to add citric acid to the second mixed solution obtained in step S2, adjust the pH to 4, cool to 70°C and react for 3h to obtain a third mixed solution; S4, adding 1.04 g of terbium nitrate hexahydrate, 1.85 g of ytterbium nitrate hexahydrate and 140 g of anhydrous ethanol to the third mixed solution obtained in step S3, heating to 210° C. and reacting for 11 hours to obtain a fourth mixed solution; S5, centrifuging the fourth mixed solution obtained in step S4 to obtain a crude product; S6. The crude product obtained in step S5 is placed in a muffle furnace and calcined at 500° C. for 3 hours, and then ground for 3 hours. The ground product is cleaned with a cleaning solution consisting of anhydrous ethanol and deionized water in a sufficient volume ratio of 1:2, and finally vacuum dried at 70° C. to obtain the photothermal catalyst TbYbCeO2.

[0020] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the addition of chitosan and polyethylene glycol is eliminated, and the remaining steps are exactly the same as those of Example 1.

[0021] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the addition of citric acid is eliminated, and the remaining steps are exactly the same as those of Example 1.

[0022] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the addition of citric acid is eliminated, and dilute hydrochloric acid is added instead, and the pH is adjusted to the same pH as in Example 1. The remaining steps are exactly the same as in Example 1.

[0023] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the addition of terbium nitrate hexahydrate and ytterbium nitrate hexahydrate is eliminated, and the remaining steps are exactly the same as those of Example 1.

[0024] Before the test, the catalyst powder synthesized in the above embodiment is first placed in a tablet press and pressed into sheets by applying appropriate pressure. Subsequently, the pressed sheet catalyst is screened using a sieve, and particles with a particle size between 50 mesh and 100 mesh are selected as the final test product.

[0025] The specific testing process is as follows: In a device capable of continuously capturing and containing methane molecules and carbon dioxide gas, 0.2 g of Tb / Yb / CeO2 photothermal catalyst prepared in Example 1 was filled. In a concentrated flow phase test system, the light intensity was 60 kW / m2. The concentrated light irradiation produced a thermal effect so that the catalyst surface temperature was stably maintained between 480°C and 500°C. At the same time, a gas chromatograph (Shimadzu GC-8A) equipped with a thermal conductivity detector (TCD) and a hydrogen ion flame detector (FID) was used to analyze the reactant gas and the product gas. The generated product synthesis gas and the conversion rate of methane and carbon dioxide were detected. The volume ratio of methane to carbon dioxide was 1:1, and the flow rate of the reaction gas (CH4:CO2) was controlled at 40 mL min -1 ; In order to study the catalytic stability of the catalyst, a stability test was carried out using Tb / Yb / CeO2 in Example 1 for a total of 40 hours, with sampling every 10 hours. The experimental results are shown in Table 1. The results show that the catalyst can maintain a good catalytic effect and does not lose activity during the cyclic test.

[0026] Table 1: Stability performance test results of Tb / Yb / CeO2 prepared in Example 1 for preparing synthesis gas by concentrated photocatalysis

[0027] In a device capable of continuously capturing and containing methane molecules and carbon dioxide gas, 0.2 g of Tb / Yb / CeO2 photothermal catalyst prepared in Example 1 was filled. In a concentrated flow phase test system, the light intensity was adjusted to 30 kW / m2, 40 kW / m2, 60 kW / m2, and 70 kW / m2 in sequence. The concentrated light irradiation produced a thermal effect so that the catalyst surface temperature was stably maintained between 480°C and 500°C. At the same time, a gas chromatograph (Shimadzu GC-8A) equipped with a thermal conductivity detector (TCD) and a hydrogen ion flame detector (FID) was used to analyze the reactant gas and the product gas, and the generated product synthesis gas and the conversion rate of methane and carbon dioxide were detected. The volume ratio of methane to carbon dioxide was 1:1, and the flow rate of the reaction gas (CH4:CO2) was controlled at 40 mL min-1 ; The specific test results are shown in Table 2 below: Table 2: Catalytic effect of Tb / Yb / CeO2 prepared in Example 1 under different light intensities

[0028] It can be seen from Table 2 above that as the light intensity increases, the catalytic strength of Tb / Yb / CeO2 also increases.

[0029] The same test method as that in Table 1 was used, and the test time was 10 hours. The photothermal catalysts prepared in Examples 2-4 and Comparative Examples 1-4 were subjected to photocatalytic tests. The test results are shown in Table 3 below:

[0030] Comparative Example 4 prepares CeO2, which does not have catalytic performance compared with Tb / Yb / CeO2 prepared in Example 1. In Comparative Example 1, in the absence of the addition of chitosan and polyethylene glycol, the catalytic ability is greatly reduced relative to that of Example 1 due to the lack of formation of a polymer compound carrier. Comparison between Comparative Example 2 and Example 1 shows that the catalytic performance also decreases in the absence of the addition of citric acid. Comparative Example 3 proves that even if citric acid is replaced with hydrochloric acid and adjusted to the same pH, the catalytic activity is reduced. Here, citric acid also plays a role in regulating the surface charge of cerium oxide, facilitating the combination of terbium ions and ytterbium ions.

[0031] Figure 2 The X-ray diffraction patterns of the photothermal catalysts Tb / Yb / CeO2 and CeO2 prepared in Example 1 and Comparative Example 4; Figure 1 It can be seen that the diffraction peaks at 28.6°, 33.1° and 47.5° are the main three strong lines, corresponding to the diffraction peaks of the (111), (200) and (220) crystal planes of the CeO2 standard card (PDF#47-1487), respectively, indicating that the cubic fluorite structured CeO2 material was successfully synthesized; since the doping amounts of Tb and Yb in the tested samples were relatively low, there was no additional effect on the phase structure, so no other diffraction peaks appeared in the XRD diffraction spectrum; the prepared catalyst material has good crystallinity, and the doping of Tb / Yb does not destroy the basic crystal structure of CeO2, which helps to maintain the stability and activity of the catalyst; Figure 3 This is a transmission electron microscope image of the catalyst CeO2 prepared in Comparative Example 4. Figure 3 It can be observed that the catalyst mainly presents a uniform nanoparticle morphology, with a particle size distribution between 5 and 20 nanometers. These nanoparticles have a relatively regular shape, indicating that a relatively uniform crystal structure is formed during the synthesis process. In some areas; Figure 4 is a transmission electron microscope image of the photothermal catalyst Tb / Yb / CeO2 prepared in Example 1. Figure 4 It can be observed that the image shows nanoparticles with a sheet-like stacking structure, with a size of about 200 nanometers, no obvious agglomeration, and possible interlayer spacing between particles, indicating a large surface area, which may enhance its catalytic or optical properties.

[0032] Figure 5 is a comparison chart of the UV-visible absorption spectra of the photothermal catalyst Tb / Yb / CeO2 and the catalyst CeO2 prepared in Example 1 and Comparative Example 4. Figure 5 It can be observed that both have strong absorption in the ultraviolet region of 200-400 nm, and the absorption peak of Tb / Yb / CeO2 is slightly higher, especially at 250 nm, indicating that the composite material has a slightly stronger absorption capacity in ultraviolet light; in addition, the absorption intensity of Tb / Yb / CeO2 in the visible light region is also higher than that of CeO2, showing its potential in applications such as photocatalysis.

[0033] Figure 6 The photothermal catalyst Tb / Yb / CeO2 of Example 1 is analyzed by adjusting the surface temperature change diagram of different light energies. Figure 6 It can be seen that the catalytic reaction system included in the present invention can be used to control the catalyst surface temperature. When the photothermal catalyst Tb / Yb / CeO2 of Example 1 is filled in the reaction system, no matter how the different concentrated light illumination intensities are adjusted, the overall temperature of the reaction system can be stably maintained between 480°C and 500°C; this also reflects that compared to the traditional heat-driven catalytic reaction process, the photothermal catalyst Tb / Yb / CeO2 in the present invention can more reasonably use the light efficiency in the photothermal reaction.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a photothermal catalyst TbYbCeO2, characterized in that: The following steps are involved: S1, adding cerium nitrate hexahydrate and chitosan into deionized water, stirring and mixing to obtain a first mixed solution; S2, adding polyethylene glycol, formaldehyde, urea and polyvinyl pyrrolidone to the first mixed solution obtained in step S1, heating to 90-110° C., reacting for 5-12 hours, to obtain a second mixed solution; S3, continue to add citric acid to the second mixed solution obtained in step S2, adjust the pH to 3-4.5, cool to 60-80°C and react for 1-3h to obtain a third mixed solution; S4, continuing to add terbium nitrate hexahydrate, ytterbium nitrate hexahydrate and anhydrous ethanol to the third mixed solution obtained in step S3, raising the temperature to 180-220° C. and reacting for 10-13 hours to obtain a fourth mixed solution; S5, centrifuging the fourth mixed solution obtained in step S4 to obtain a crude product; S6. The crude product obtained in step S5 is placed in a muffle furnace for calcination, and then ground for 2-4 hours. The ground product is washed with a sufficient amount of cleaning solution, and finally vacuum dried to obtain the photothermal catalyst TbYbCeO2.

2. The method for preparing the photothermal catalyst TbYbCeO2 according to claim 1, characterized in that: In the step S1, the mass ratio of cerium nitrate hexahydrate, chitosan and deionized water is 1:(1.2-2.2):(8.5-14.6).

3. The method for preparing the photothermal catalyst TbYbCeO2 according to claim 1, characterized in that: The mass ratio of polyethylene glycol, formaldehyde, urea and polyvinyl pyrrolidone in step S2 to chitosan in step S1 is 1:(0.1-0.3):(0.08-0.2):(0.2-0.9):(2.5-3.4).

4. The method for preparing the photothermal catalyst TbYbCeO2 according to claim 1, characterized in that: The mass ratio of the anhydrous ethanol, terbium nitrate hexahydrate and ytterbium nitrate hexahydrate in step S4 to the cerium nitrate hexahydrate in step S1 is (6.2-12.3):(0.03-0.15):(0.08-0.2):

1.

5. The method for preparing the photothermal catalyst TbYbCeO2 according to claim 1, characterized in that: In step S6, the calcination temperature in the muffle furnace is 400-550° C., the calcination time is 2-4 hours, and the temperature of vacuum drying after the product is washed is 50-80° C.

6. The method for preparing the photothermal catalyst TbYbCeO2 according to claim 1, characterized in that: The cleaning solution in step S6 is a mixture of anhydrous ethanol and deionized water, and the volume ratio between the anhydrous ethanol and the deionized water is 1:

2.

7. Application of the photothermal catalyst TbYbCeO2 prepared by the preparation method of the photothermal catalyst TbYbCeO2 as described in any one of claims 1 to 6 in concentrated photocatalytic dry reforming.

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