Method for solvothermal synthesis of porous CeO2
The preparation of porous CeO2 by solvent thermal synthesis method is solved, and the problems of poor mechanical properties, difficulty in selecting templates and high cost in the preparation of porous CeO2 in the template method are solved, and the energy consumption, cost reduction and material performance improvement of the preparation process are achieved.
Patent Information
- Application Number
- CN202411943915.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-02-18
AI Technical Summary
The existing template method has problems such as poor mechanical properties, difficult template selection, and high cost, which limits its application scope and flexibility.
By using the solvent-thermal synthesis method, porous CeO2 was obtained by mixing cerium nitrate hexahydrate and triethanolamine in anhydrous ethanol to form a Ce-TEA complex, and then undergoing solvent heat treatment and calcination.
This method does not require the selection of templates, and the energy consumption and equipment requirements are low. The prepared porous CeO2 has good continuity, improves the mechanical properties of the porous materials, and reduces production costs.
Smart Images
Figure CN119461457A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of rare earth oxide synthesis, and more specifically, to a method for solvent thermal synthesis of porous CeO 2 method. Background Art
[0002] Cerium is the most abundant metal element in the rare earth group. 2 ) is an important functional inorganic material among rare earth compounds, and has shown attractive prospects in the fields of environmental science, life science, biomedicine, industrial production, etc. Among them, porous CeO 2 Due to its unique structure and excellent performance, such as light weight, high strength, heat insulation, sound insulation, adsorption, catalysis, etc., it has attracted the research and in-depth exploration of many scientific researchers. For example, in the field of materials science, this porous structure is widely used in aerospace and automobile manufacturing as a lightweight and high-strength composite material; in biomedicine, this porous structure is conducive to cell growth and the transportation of nutrients and is used to prepare tissue engineering scaffolds, drug carriers, etc.; in terms of energy and environmental protection, this porous adsorption material can be used for the treatment of wastewater and exhaust gas to remove harmful substances, and this porous catalyst can improve the efficiency and selectivity of chemical reactions.
[0003] At present, porous CeO 2 The main preparation method is the template method, which can control the porous CeO by selecting a suitable template. 2 The pore size, pore structure and specific surface area of the porous materials prepared by the template method are excellent in terms of structure controllability and porosity. 2 , because the discontinuity of its porous structure often leads to poor mechanical properties; secondly, the template method is used to prepare porous CeO 2 It depends on choosing a suitable template. Not all templates are suitable for preparing porous CeO 2 , and the acquisition and pretreatment of templates are also difficult, which greatly limits the application scope and flexibility of the template method; in addition, due to the cost of template materials, energy consumption in the preparation process, and the special equipment that may be required, the template method is difficult to prepare porous CeO 2 The cost is relatively high, and this cost issue will be more prominent for large-scale production. Summary of the invention
[0004] The purpose of this application is to provide a solvent thermal synthesis of porous CeO 2 The porous CeO was synthesized by solvothermal process. 2 Compared with the template method, there is no need to select a template, the energy consumption and equipment of the preparation process are lower, and the porous material obtained has better continuity.
[0005] The embodiment of the present application is implemented as follows:
[0006] The present invention provides a solvent thermal synthesis method for porous CeO 2 methods, including:
[0007] Dissolve cerium nitrate hexahydrate in a portion of anhydrous ethanol to obtain Ce-containing 3+ The precursor solution; the triethanolamine is mixed with another part of anhydrous ethanol to obtain a mixed solution of a precipitant and a solvent; the mixed solution of the precipitant and the solvent is added to a mixture containing Ce 3+ The precursor solution is stirred to form a Ce-TEA complex to obtain a complex mixture; wherein the mass ratio of cerium nitrate hexahydrate to triethanolamine is 1:(0.6-1.5);
[0008] The complex mixture was subjected to solvent thermal treatment to obtain CeO 2 Precursor;
[0009] CeO 2 The precursor is calcined to obtain porous CeO 2 .
[0010] The solvent thermal synthesis of porous CeO provided in the embodiment of the present application 2 The method has at least the following beneficial effects:
[0011] 1. Synthesis of porous CeO by solvothermal process 2 Using cerium nitrate hexahydrate as raw material, anhydrous ethanol as solvent, and triethanolamine as precipitant, the raw materials are mixed and reacted in a specific order, and then subjected to solvent thermal treatment, and then calcined to obtain porous CeO 2 Compared with the template method, there is no need to select a template, the energy consumption and equipment of the preparation process are lower, and it has the advantages of simple operation, low cost and wide range of applications.
[0012] 2. Porous CeO 2 It has good continuity and can improve the mechanical properties of porous materials.
[0013] In some embodiments, the mass ratio of cerium nitrate hexahydrate to triethanolamine is 1:(1.0-1.5).
[0014] In some embodiments, the mass ratio of cerium nitrate hexahydrate to triethanolamine is 1:(1.0-1.1) or 1:(1.3-1.5).
[0015] In some embodiments, the mass ratio of triethanolamine to all anhydrous ethanol is (0.6-1.5):9.09.
[0016] In some embodiments, during the solvothermal treatment, the treatment time is ≥ 1 h.
[0017] In some embodiments, during the solvothermal treatment, the treatment time is ≥ 20 h.
[0018] In some embodiments, during the solvothermal treatment, the treatment time is 20 h to 42 h.
[0019] In some embodiments, during the solvothermal treatment, the treatment time is 20 h to 36 h.
[0020] In some embodiments, during the solvothermal treatment, the treatment temperature is 100°C to 140°C.
[0021] In some embodiments, during the calcination process, the calcination temperature is 450° C. to 550° C., and the calcination time is 0.5 h to 2 h. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 The CeO synthesized in Example 1 of this application 2 XRD patterns and SEM images of
[0024] Figure 2 The CeO synthesized in Example 2 of this application 2 XRD patterns and SEM images of
[0025] Figure 3 The CeO synthesized in Example 3 of this application 2 XRD patterns and SEM images of
[0026] Figure 4 The CeO synthesized in Example 4 of this application 2 XRD patterns and SEM images of
[0027] Figure 5 The CeO synthesized in Example 5 of this application 2 XRD patterns and SEM images of
[0028] Figure 6 The CeO synthesized in Example 6 of this application 2 XRD patterns and SEM images of
[0029] Figure 7The CeO synthesized in Example 7 of this application 2 XRD patterns and SEM images of
[0030] Figure 8 The CeO synthesized in Example 8 of this application 2 XRD patterns and SEM images of
[0031] Fig. 9 XRD and SEM images of the sample synthesized in Comparative Example 1 of the present application;
[0032] Fig.10 XRD and SEM images of the sample synthesized in Comparative Example 2 of the present application;
[0033] Fig.11 XRD and SEM images of the sample synthesized in Comparative Example 3 of the present application;
[0034] Fig.12 These are the XRD and SEM images of the sample synthesized in Comparative Example 4 of the present application. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.
[0036] It should be noted that “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three situations of “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”.
[0037] In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" in "one or more" refers to two or more; the range of "value a ~ value b" includes the two end values "a" and "b", and the "unit" in "value a ~ value b + unit of measurement" represents the "unit of measurement" of both "value a" and "value b".
[0038] The technical solutions of the embodiments of the present application are exemplarily described below.
[0039] The present invention provides a solvent thermal synthesis method for porous CeO 2 methods, including:
[0040] Dissolve cerium nitrate hexahydrate in a portion of anhydrous ethanol to obtain Ce-containing 3+The precursor solution; the triethanolamine is mixed with another part of anhydrous ethanol to obtain a mixed solution of a precipitant and a solvent; the mixed solution of the precipitant and the solvent is added to a mixture containing Ce 3+ The precursor solution is stirred to form a Ce-TEA complex to obtain a complex mixture; wherein the mass ratio of cerium nitrate hexahydrate to triethanolamine is 1:(0.6-1.5).
[0041] The complex mixture was subjected to solvent thermal treatment to obtain CeO 2 Precursor.
[0042] CeO 2 The precursor is calcined to obtain porous CeO 2 .
[0043] The solvent thermal synthesis of porous CeO provided in the embodiment of the present application 2 The method works as follows:
[0044] In the ethanol system, cerium nitrate hexahydrate (chemical formula Ce(NO 3 ) 3 6H 2 O) was dissolved in ethanol to make Ce 3+ Evenly dispersed in the ethanol system. Add triethanolamine (chemical formula C 6 H 15 NO 3 , abbreviated as TEA), there is a lone electron pair on the nitrogen atom in triethanolamine, which has a strong coordination ability and can 3+ The empty orbital of ethanol is coordinated to form a Ce-TEA complex. Further treatment by solvothermal method, under the conditions of high temperature and high pressure, the solvation ability of ethanol is enhanced, which can promote the transformation and crystallization of Ce-TEA complex, so that cerium nitrate hexahydrate and triethanolamine are more completely transformed into Ce-TEA complex to form the preparation of CeO 2 The precursor precipitate is further calcined in a conventional air atmosphere to convert Ce 3+ Oxidation, removal of organic residues, promotion of CeO 2 The crystal structure is formed to obtain pure porous CeO 2 .
[0045] The study found that in the technical solution of the present application, the amount of triethanolamine is controlled to regulate the formation of porous morphology of the induced product. When the amount of cerium nitrate hexahydrate is kept unchanged, if the amount of triethanolamine is too small, triethanolamine is difficult to induce CeO 2 The porous morphology is formed, and the obtained precursor is very small, which makes it difficult to carry out the subsequent calcination operation, and it is difficult to obtain porous CeO 2If the amount of triethanolamine is appropriate, CeO with a stable and clear porous morphology can be obtained. 2 If the amount of triethanolamine used is too much, not only the amount and cost of raw materials will increase, but also the obtained product will not form a porous morphology.
[0046] In the embodiments of the present application, the mass ratio of cerium nitrate hexahydrate to triethanolamine is, for example but not limited to, any one of 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1.0, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5 or a range value between any two of them.
[0047] Exemplarily, the mass ratio of cerium nitrate hexahydrate to triethanolamine is 1:(0.6-0.8).
[0048] Exemplarily, the mass ratio of cerium nitrate hexahydrate to triethanolamine is 1:(1.0-1.5).
[0049] Optionally, the mass ratio of cerium nitrate hexahydrate to triethanolamine is 1:(1.0-1.1) or 1:(1.3-1.5).
[0050] The study found that in the technical solution of the present application, the use of anhydrous ethanol is conducive to forming a porous morphology of the product. Based on the method provided in the embodiment of the present application, when the anhydrous ethanol is replaced with common or similar solvents such as water and methanol under the condition that other experimental conditions remain unchanged, the obtained product does not form a porous morphology.
[0051] In the embodiments of the present application, triethanolamine is an oily liquid with a high density, which is inconvenient to use, and has high operation requirements when controlling the dosage; and the dosage of triethanolamine will affect the formation of its induced products, and the dosage of triethanolamine needs to be accurately controlled. Based on this, anhydrous ethanol is divided into two parts, one part is used to dissolve cerium nitrate hexahydrate, and the other part is used to dissolve triethanolamine, which is conducive to more accurate control of the dosage of triethanolamine.
[0052] It should be noted that, in the examples of the present application, the amount of anhydrous ethanol is required to be sufficient to dissolve cerium nitrate hexahydrate and triethanolamine respectively.
[0053] Optionally, the mass ratio of triethanolamine to all anhydrous ethanol is (0.6-1.5):9.09, and the mass ratio of the two is, for example but not limited to, any one of 0.6:9.09, 0.7:9.09, 0.8:9.09, 0.9:9.09, 1.0:9.09, 1.1:9.09, 1.2:9.09, 1.3:9.09, 1.4:9.09, 1.5:9.09 or a range between any two of them.
[0054] As an example, the mass ratios of cerium nitrate hexahydrate, triethanolamine, and anhydrous ethanol are 1:(0.6-1.5):9.09, respectively.
[0055] Wherein, all anhydrous ethanol refers to the sum of anhydrous ethanol for dissolving cerium nitrate hexahydrate and anhydrous ethanol for dissolving triethanolamine. Based on the usage ratio requirement of anhydrous ethanol, cerium nitrate hexahydrate and triethanolamine can be fully dissolved without causing excessive solvent waste.
[0056] It can be understood that, in the examples of the present application, there is no specific requirement for the usage ratio of the two parts of anhydrous ethanol, as long as the cerium nitrate hexahydrate and triethanolamine are fully dissolved respectively.
[0057] The solvent thermal synthesis of porous CeO provided in the embodiment of the present application 2 The method has at least the following beneficial effects:
[0058] 1. Synthesis of porous CeO by solvothermal process 2 Using cerium nitrate hexahydrate as raw material, anhydrous ethanol as solvent, and triethanolamine as precipitant, the raw materials are mixed and reacted in a specific order, and then subjected to solvent thermal treatment, and then calcined to obtain porous CeO 2 Compared with the template method, there is no need to select a template, the energy consumption and equipment of the preparation process are lower, and it has the advantages of simple operation, low cost and wide range of applications.
[0059] 2. Porous CeO 2 It has good continuity and can improve the mechanical properties of porous materials.
[0060] The study also found that during the solvent thermal treatment process, after 1 hour of reaction, the product had formed a porous structure, but at this time the crystals were in a relatively primitive state and the pores were not completely formed; as the reaction time increased, the morphology of the product gradually improved, for example, the crystals began to become regular, the pores gradually became more uniform, and the pores were formed more completely; and after the product obtained a better morphology, continuing to increase the reaction time no longer had a significant effect on the morphology of the product.
[0061] In some embodiments, during the solvothermal treatment, the treatment time is ≥ 1 h; at this time, the product has begun to form a porous structure.
[0062] Furthermore, during the solvent thermal treatment, the treatment time is ≥12h; based on this, the crystals of the product are more regular and the pores are more uniform.
[0063] In some embodiments, during the solvent thermal treatment, the treatment time is ≥ 20 h; based on this, the crystals of the product are more regular, the pores are more uniform, and the pores are formed more completely.
[0064] In some embodiments, during the solvent thermal treatment, the treatment time is 20h to 42h; further, the treatment time is 20h to 36h; based on this, in order to obtain a porous CeO with better morphology 2 At the same time, it can ensure the reaction efficiency.
[0065] Based on this, the time for solvent thermal treatment can be selected as needed, for example but not limited to any point value among 1h, 3h, 6h, 9h, 12h, 15h, 18h, 20h, 24h, 28h, 32h, 36h, 40h, 42h or a range value between any two of them.
[0066] In order to better control the solvent thermal treatment process, in some embodiments, the temperature of the solvent thermal treatment is specifically selected. Exemplarily, during the solvent thermal treatment process, the treatment temperature is 100°C to 140°C, and the treatment temperature is, for example but not limited to, any one of 100°C, 110°C, 120°C, 130°C, 140°C or a range between any two of them. Based on this, there is enough temperature to ensure that the reaction obtains a porous structure product with stable morphology and uniform distribution; at the same time, it avoids excessively high temperature, which leads to increased equipment costs and energy waste.
[0067] In order to better control the roasting process, in some embodiments, the temperature and time of the roasting treatment are specifically selected. Exemplarily, during the roasting process, the roasting temperature is 450°C to 550°C, and the roasting temperature is, for example but not limited to, any one of 450°C, 460°C, 470°C, 480°C, 490°C, 500°C, 510°C, 520°C, 530°C, 540°C, and 550°C, or a range between any two of them; the roasting time is 0.5h to 2h, and the roasting time is, for example but not limited to, any one of 0.5h, 1.0h, 1.5h, and 2h, or a range between any two of them.
[0068] The features and performance of the present application are further described in detail below in conjunction with the embodiments.
[0069] 1. The experimental conditions of each embodiment and comparative example are as follows:
[0070] Example 1
[0071] A solvothermal synthesis of porous CeO 2 methods, including:
[0072] S1. At room temperature, Ce(NO 3 ) 3 6H 2 O was dissolved in a portion of anhydrous ethanol to obtain Ce 3+ The precursor solution of C 6 H15 NO 3 The mixture of the precipitant and the solvent is then added to the Ce-containing solution which is continuously stirred. 3+ The precursor solution was stirred for 45 minutes to form a milky white Ce-TEA complex to obtain a complex mixed solution.
[0073] Among them, according to the mass ratio, Ce(NO 3 ) 3 6H 2 O:C 6 H 15 NO 3 : anhydrous ethanol = 1: 0.69: 9.09. It should be noted that the mass of anhydrous ethanol in the above ratio corresponds to the total mass of the two parts of anhydrous ethanol.
[0074] S2, the complex mixture was transferred to a tetrafluoroethylene-lined autoclave for solvent thermal treatment; then, the precipitate was washed until the supernatant was neutral, and then dried at 60°C for 24h to obtain CeO 2 Precursor powder.
[0075] The temperature of the solvent thermal treatment is 120°C and the time is 24 hours.
[0076] S3, CeO 2 The precursor powder was transferred to a muffle furnace and calcined at 500°C for 1 h to obtain a light yellow solid powder, i.e., CeO synthesized in this example. 2 sample.
[0077] Example 2
[0078] A solvothermal synthesis of porous CeO 2 The method is different from Example 1 in that:
[0079] In step S1, Ce(NO 3 ) 3 6H 2 O:C 6 H 15 NO 3 : Anhydrous ethanol = 1:1.03:9.09.
[0080] Example 3
[0081] A solvothermal synthesis of porous CeO 2 The method is different from Example 1 in that:
[0082] In step S1, Ce(NO 3 )3 6H 2 O:C 6 H 15 NO 3 : Anhydrous ethanol = 1:1.37:9.09.
[0083] Example 4
[0084] A solvothermal synthesis of porous CeO 2 The method is different from Example 2 in that:
[0085] In step S2, the solvent thermal treatment time is 36 h.
[0086] Example 5
[0087] A solvothermal synthesis of porous CeO 2 The method is different from Example 2 in that:
[0088] In step S2, the solvent thermal treatment time is 12 h.
[0089] Example 6
[0090] A solvothermal synthesis of porous CeO 2 The method is different from Example 2 in that:
[0091] In step S2, the solvent thermal treatment time is 6 h.
[0092] Example 7
[0093] A solvothermal synthesis of porous CeO 2 The method is different from Example 2 in that:
[0094] In step S2, the solvent thermal treatment time is 3 h.
[0095] Example 8
[0096] A solvothermal synthesis of porous CeO 2 The method is different from Example 2 in that:
[0097] In step S2, the solvent thermal treatment time is 1 h.
[0098] Comparative Example 1
[0099] A solvothermal synthesis of porous CeO 2 The method is different from Example 1 in that:
[0100] In step S1, Ce(NO 3 ) 3 6H 2 O:C6 H 15 NO 3 : Anhydrous ethanol = 1:1.72:9.09.
[0101] Comparative Example 2
[0102] A solvothermal synthesis of porous CeO 2 The method is different from Example 1 in that:
[0103] In step S1, C 6 H 15 NO 3 The dosage is 0; that is, according to the mass ratio, Ce(NO 3 ) 3 6H 2 O:C 6 H 15 NO 3 : Anhydrous ethanol = 1:0:9.09.
[0104] Comparative Example 3
[0105] A solvothermal synthesis of porous CeO 2 The method is different from Example 2 in that:
[0106] In step S1, anhydrous ethanol is replaced with an equal volume of methanol.
[0107] Comparative Example 4
[0108] A solvothermal synthesis of porous CeO 2 The method is different from Example 2 in that:
[0109] In step S1, anhydrous ethanol is replaced with an equal volume of water.
[0110] For the convenience of analysis and comparison, the relevant experimental conditions in each embodiment and comparative example are summarized in the following Table 1.
[0111] Table 1. Experimental conditions of examples and comparative examples
[0112]
[0113]
[0114] 2. The products of each embodiment and comparative example were tested, and the results are as follows:
[0115] The CeO synthesized in Examples 1 to 8 2 The samples synthesized in Comparative Examples 1 to 4 were analyzed by XRD patterns and SEM images. Figures 1 to 12 shown.
[0116] Depend on Figures 1 to 3 It can be seen that in Examples 1 to 3, the synthesized CeO 2 It presents a continuous porous network structure, with the range and boundaries of the holes clearly visible.
[0117] Depend on Figure 4 It can be seen that in Example 4, the synthesized CeO 2 Compared with Example 2, in Example 4, the solvent thermal treatment time is too long and the synthesis efficiency is reduced.
[0118] Depend on Figures 5 to 8 It can be seen that in Examples 5 to 8, the synthesized CeO 2 The porous structure is different from that of Example 2 in microstructure. Compared with Example 2, the time of solvent thermal treatment in Examples 5 to 8 is gradually shortened, indicating that shortening the time appropriately will not significantly affect the CeO 2 The formation of a porous structure has an impact on the formation of the microstructure.
[0119] in:
[0120] In Example 8, the solvent thermal treatment time is 1 h, CeO 2 The crystal surface is rough, and the crystals are of different sizes and shapes, indicating that the solvothermal reaction has not yet been fully carried out. The crystals are in a relatively primitive state and are not fully formed.
[0121] In Example 7, the solvent thermal treatment time is 3 hours. After the initial solvent thermal reaction, the crystals begin to become regular compared with Example 8, but some small particles are attached to the surface.
[0122] In Example 6, the solvent thermal treatment time is 6 hours. Compared with Example 7, the crystals grow and become more compact, but the formed pores are still uneven, and there are still some incompletely formed pores.
[0123] In Example 5, the solvent thermal treatment time is 12 hours. Compared with Example 2, Example 5 has better morphological integrity, no excessive holes are exposed, higher diffraction peaks, and better crystallinity than Example 2.
[0124] Depend on Fig. 9 It can be seen that in Comparative Example 1, the synthesized CeO 2 No porous structure was formed. In this comparative example 1, due to the precipitation agent C 6 H 15 NO 3 The dosage is too high, which causes the precipitates to form quickly and pile up together, resulting in insufficient time and space for the precipitates to form a porous structure.
[0125] Depend on Fig.10It can be seen that in Comparative Example 2, the synthesized CeO 2 No porous structure was formed. In this comparative example 2, since there was no precipitant C 6 H 15 NO 3 The addition of , results in the inability to induce the precipitate to form a porous structure.
[0126] Depend on Fig.11 It can be seen that in Comparative Example 3, the synthesized CeO 2 No porous structure is formed, CeO 2 The surface microstructure is blocky.
[0127] Depend on Fig.12 It can be seen that in Comparative Example 4, the synthesized CeO 2 No porous structure is formed, CeO 2 The surface microstructure is densely granular.
[0128] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.
Claims
1. A method for solvent thermal synthesis of porous CeO2, characterized in that: include: Dissolve cerium nitrate hexahydrate in a portion of anhydrous ethanol to obtain Ce-containing 3+ A precursor solution; The triethanolamine is mixed with another part of anhydrous ethanol to obtain a mixed solution of a precipitant and a solvent; the mixed solution of the precipitant and the solvent is added to the Ce-containing 3+ The precursor solution is stirred to form a Ce-TEA complex to obtain a complex mixture; wherein the mass ratio of the cerium nitrate hexahydrate to the triethanolamine is 1:(0.6-1.5); The complex mixture is subjected to a solvent thermal treatment to obtain a CeO2 precursor; The CeO2 precursor is calcined to obtain porous CeO2.
2. The method for solvent thermal synthesis of porous CeO2 according to claim 1, characterized in that: The mass ratio of the cerium nitrate hexahydrate to the triethanolamine is 1:(1.0-1.5).
3. The method for solvent thermal synthesis of porous CeO2 according to claim 2, characterized in that: The mass ratio of the cerium nitrate hexahydrate to the triethanolamine is 1:(1.0-1.1) or 1:(1.3-1.5).
4. The method for solvent thermal synthesis of porous CeO2 according to claim 1, characterized in that: The mass ratio of the triethanolamine to the total anhydrous ethanol is (0.6-1.5):9.
09.
5. The method for solvent thermal synthesis of porous CeO2 according to claim 1, characterized in that: During the solvent thermal treatment, the treatment time is ≥ 1 h.
6. The method for solvent thermal synthesis of porous CeO2 according to claim 5, characterized in that: During the solvent thermal treatment, the treatment time is ≥20h.
7. The method for solvent thermal synthesis of porous CeO2 according to claim 6, characterized in that: During the solvent thermal treatment, the treatment time is 20 hours to 42 hours.
8. The method for solvent thermal synthesis of porous CeO2 according to claim 7, characterized in that: During the solvent thermal treatment, the treatment time is 20 hours to 36 hours.
9. The method for solvothermal synthesis of porous CeO2 according to any one of claims 4 to 8, characterized in that: During the solvent thermal treatment, the treatment temperature is 100°C to 140°C.
10. The method for solvent thermal synthesis of porous CeO2 according to claim 1, characterized in that: During the calcination process, the calcination temperature is 450° C. to 550° C., and the calcination time is 0.5 h to 2 h.