Catalyst, its preparation method and application in reaction of hydrogenation of maleic anhydride to succinic anhydride

Abstract

The application discloses a catalyst, a preparation method thereof and application of the catalyst in a reaction of preparing succinic anhydride by hydrogenation of maleic anhydride. The catalyst comprises the following components: a carrier and an active component supported on the carrier; the active component is Ni, and at least part of the Ni element exists in a Ni-N-C structure; the content of the Ni is 10-40 wt% and the content of the carrier is 60-90 wt% according to the total mass of the active component and the mass of the carrier being 100%. In the preparation process of the catalyst, a nitrogen-containing compound is added, and the nitrogen-containing compound forms the Ni-N-C structure with the Ni after the catalyst matrix is calcined, so that the pore structure of the catalyst is changed, and the catalyst performance is improved. The catalyst is applied to the reaction of preparing succinic anhydride by hydrogenation of maleic anhydride and has high maleic anhydride conversion rate and succinic anhydride selectivity.

Description

Technical Field

[0001] This invention relates to the technical field of catalyst preparation, and more specifically, to catalysts, their preparation methods, and their application in the hydrogenation of maleic anhydride to succinic anhydride. Background Technology

[0002] Succinic anhydride is a food processing aid specified in national standards. It is a raw material for the synthesis of pharmaceuticals, pesticides, esters and resins, and an intermediate in the synthesis of organic compounds in the organic industry.

[0003] In recent years, with the widespread application of biodegradable materials, the demand for succinic acid, as one of its monomers, has been increasing year by year. The production capacity and quality requirements for succinic anhydride, the raw material used to synthesize succinic acid, are also gradually increasing.

[0004] Currently, the industrial methods for producing succinic anhydride include: bio-fermentation, succinic acid dehydration, and maleic anhydride catalytic hydrogenation. While bio-fermentation is environmentally friendly, its purification process is complex and its product yield is low, making it difficult to meet the needs of large-scale industrial production. Succinic acid dehydration has a lower technological threshold, but its production scale is small and its product quality is low, making it difficult to meet the supply of high-purity succinic anhydride raw materials. Maleic anhydride hydrogenation, with its simple process flow, convenient operation, high equipment utilization, low operating costs, and high product purity, is the most promising succinic anhydride production process.

[0005] Patent CN103769117A discloses a catalyst supported on activated carbon with cobalt / nickel as the active metal for the synthesis of succinic anhydride by hydrogenation of maleic anhydride. This catalyst also incorporates other metal additives, making the preparation process complex and requiring a high reaction temperature during the hydrogenation reaction.

[0006] Patent 104399469A discloses a catalyst with alumina as the support and nickel as the active component. Although the preparation process of this catalyst is simple, it can only be used for batch synthesis reactions in the synthesis process of maleic anhydride hydrogenation to succinic anhydride and cannot be applied to continuous large-scale production.

[0007] Patent 105833863A discloses a supported catalyst in which the active metal is palladium, a noble metal. This increases the preparation cost of the catalyst and will also increase the production cost in the large-scale industrial production of succinic anhydride by catalytic hydrogenation.

[0008] Currently, there are many existing technologies for the hydrogenation of maleic anhydride to prepare succinic anhydride. However, existing methods often suffer from drawbacks such as high catalyst preparation costs and poor catalytic performance.

[0009] Therefore, developing a new catalyst with high catalytic activity to meet the production needs of succinic anhydride is of practical significance. Summary of the Invention

[0010] To address the problems in existing technologies, this invention proposes a catalyst, its preparation method, and its application in the hydrogenation of maleic anhydride to succinic anhydride. In this invention, a nitrogen-containing compound is added during catalyst preparation. After calcination of the catalyst matrix, this nitrogen-containing compound forms a Ni-NC structure with Ni, thereby altering the pore structure of the catalyst and contributing to improved catalyst performance.

[0011] One object of the present invention is to provide a catalyst comprising the following components:

[0012] The carrier and the active components loaded on the carrier;

[0013] The active component is Ni, and at least a portion of the Ni element exists in a Ni-NC structure;

[0014] With the sum of the mass of the active component and the mass of the carrier being 100%, the content of Ni is 10-40% by weight, and the content of the carrier is 60-90% by weight.

[0015] In the catalyst described in this invention, preferably,

[0016] The support is selected from at least one of Al2O3 and SiO2; and / or,

[0017] Based on the sum of the mass of the active component and the mass of the support being 100%, the Ni content is 15-35% by weight, and the support content is 65-85% by weight; and / or,

[0018] The molar ratio of Ni to nitrogen in the catalyst is 1:0.5-2, preferably 1:0.5-1.5, and more preferably 1:0.6-0.8.

[0019] In the catalyst described in this invention, preferably,

[0020] The catalyst has a specific surface area of ​​280-380 m². 2 / g, preferably 320-360 m 2 / g, further preferably 335-360 m 2 / g; and / or,

[0021] The catalyst has a pore volume of 0.2-0.8 m³. 3 / g, preferably 0.35-0.7 m 3 / g, further preferably 0.4-0.6m 3 / g; and / or,

[0022] The catalyst has an average pore size of 3-7 nm, preferably 4-6.6 nm, and more preferably 5-6.2 nm.

[0023] A second objective of this invention is to provide a method for preparing a catalyst, comprising the following steps:

[0024] (1) The carrier is added to a solution containing a nitrogen compound to obtain mixture A;

[0025] (2) Add the precursor compound solution of the active component to the mixture A and mix evenly to obtain mixture B;

[0026] (3) The mixture B is dried and calcined to obtain the catalyst;

[0027] The catalyst is preferably used to prepare one of the objectives of this invention.

[0028] In the method for preparing the catalyst described in this invention, preferably,

[0029] Step (1), the nitrogen-containing compound is selected from at least one of aromatic amines or substituted aromatic amines; preferably,

[0030] The nitrogen-containing compound is selected from at least one of aniline or substituted aniline; more preferably,

[0031] The substituted aniline is selected from at least one of N-methylaniline, N-ethylaniline, and 2-hydroxyaniline; and / or,

[0032] The carrier is selected from at least one of Al2O3 and SiO2.

[0033] In the method for preparing the catalyst described in this invention, preferably,

[0034] In the solution of the nitrogen-containing compound,

[0035] The solvent used is an organic solvent; and / or,

[0036] The concentration of the nitrogen-containing compound is 0.2-1.0 mol / L; preferably,

[0037] The organic solvent is selected from at least one of methanol, ethanol, isopropanol, and acetone.

[0038] In the method for preparing the catalyst described in this invention, preferably,

[0039] Step (2),

[0040] The precursor compound solution of the active component is added dropwise to the mixture A; preferably, the dropping rate is 5-20 mL / min; more preferably 8-15 mL / min; and / or,

[0041] The precursor compound of the active component is an inorganic salt of nickel; preferably, the inorganic salt of nickel is selected from at least one of nickel nitrate, nickel sulfate, nickel chloride, basic nickel carbonate, and nickel acetate; and / or,

[0042] In the precursor compound solution of the active component, the concentration of the precursor compound is 0.5-1.5 mol / L; preferably 0.8-1.2 mol / L.

[0043] In the method for preparing the catalyst described in this invention, preferably,

[0044] The molar ratio of the precursor compound to the nitrogen-containing compound of the active component is 1:0.5-2, preferably 1:0.5-1.5; and / or,

[0045] Assuming the sum of the mass of the active component in the precursor compound and the mass of the support is 100%,

[0046] The precursor compound of the active component contains 10-40% by weight of the active component and 60-90% by weight of the support; preferably,

[0047] The active component in the precursor compound of the active component has a mass of 15-35% by weight, and the carrier has a mass of 65-85% by weight.

[0048] In the method for preparing the catalyst described in this invention, preferably,

[0049] Step (3),

[0050] The drying temperature is 100-120℃; preferably 105-115℃; and / or,

[0051] The drying time is 24-36 hours; preferably 28-32 hours; and / or,

[0052] The calcination temperature is 250-550℃; preferably 300-500℃; and / or,

[0053] The roasting time is 2-6 hours; preferably 3-5 hours; and / or,

[0054] The calcination atmosphere is a protective atmosphere; preferably nitrogen and an inert atmosphere; more preferably at least one of nitrogen and helium.

[0055] A third objective of this invention is to provide the application of the catalyst described in one objective of this invention or the catalyst prepared by the preparation method described in another objective of this invention in the reaction of maleic anhydride hydrogenation to succinic anhydride, preferably in the reaction of continuous maleic anhydride hydrogenation to succinic anhydride.

[0056] In the application described in this invention, preferably,

[0057] The conditions for the reaction are:

[0058] The liquid hourly space velocity (LISH) of maleic anhydride is 0.05–0.4 h⁻¹. -1 Preferably 0.1-0.3h -1 ; and / or,

[0059] The molar ratio of hydrogen to maleic anhydride is 5-25:1; preferably 10-20:1; and / or,

[0060] The temperature for hydrogenation reaction is 40-120℃; preferably 50-80℃.

[0061] The present invention does not impose any particular limitation on the specific operation method of the application of the catalyst in the hydrogenation of maleic anhydride to succinic anhydride. Those skilled in the art can use various operation methods conventionally used in the art. Two specific applications are exemplarily listed below, and those skilled in the art should not understand them as limitations on the present invention.

[0062] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values; these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. In the following, various technical solutions can, in principle, be combined with each other to obtain new technical solutions, which should also be considered as specifically disclosed herein.

[0063] Compared with the prior art, the present invention has at least the following advantages:

[0064] The nitrogen-containing compound added in this invention forms a Ni-NC structure with Ni after the catalyst matrix is ​​calcined, thereby changing the pore structure of the catalyst and helping to improve the catalyst performance.

[0065] The catalyst prepared by this invention has high activity and selectivity, and can be applied to the reaction of maleic anhydride hydrogenation to succinic anhydride with high maleic anhydride conversion and succinic anhydride selectivity. Detailed Implementation

[0066] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0067] It should also be noted that the various specific technical features described in the following embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the various possible combinations will not be described separately in this invention.

[0068] Furthermore, various embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention. The resulting technical solutions are part of the original disclosure of this specification and also fall within the protection scope of the present invention.

[0069] Unless otherwise specified, the raw materials used in the examples and comparative examples are all disclosed in the prior art, such as those that can be directly purchased or prepared according to the preparation methods disclosed in the prior art.

[0070] Example 1

[0071] (1) Weigh 55.88 g of aniline and add it to 1000 mL of ethanol. Mix well to obtain a 0.6 mol / L aniline ethanol solution;

[0072] (2) Weigh a certain amount of Al2O3 support, add it to the ethanol solution of aniline, and stir;

[0073] (3) Weigh 174.47 g of nickel nitrate hexahydrate, add it to 600 mL of deionized water, dissolve it, and obtain a nickel nitrate aqueous solution with a concentration of 1 mol / L;

[0074] (4) While stirring, add the nickel nitrate aqueous solution dropwise to the aniline ethanol solution at a rate of 10 mL / min to obtain a mixture;

[0075] (5) After the addition is complete, the mixture is dried at 120°C for 36 h to obtain the matrix catalyst;

[0076] (6) The matrix catalyst was calcined at 450°C for 4 hours in a nitrogen atmosphere to obtain catalyst S1.

[0077] Based on the sum of the mass of the active component and the mass of the support being 100%, the catalyst S1 contains: 25% by weight Ni and 75% by weight Al2O3.

[0078] In catalyst S1, the molar ratio of Ni to N is 1:0.6.

[0079] The specific surface area of ​​catalyst S1 is 354.93 m². 2 / g, with an average pore volume of 0.531m³. 3 / g, with an average pore size of 5.292nm.

[0080] Example 2

[0081] The catalyst was prepared using a method similar to that of Example 1, except that the amount of support used was different. All other aspects were the same as in Example 1, and catalyst S2 was prepared accordingly. Based on the sum of the mass of the active component and the mass of the support being 100%, catalyst S2 contains: 15% by weight Ni and 85% by weight Al2O3.

[0082] In catalyst S2, the molar ratio of Ni to N is 1:0.6.

[0083] The specific surface area of ​​catalyst S2 is 337.21 m². 2 / g, with an average pore volume of 0.565m³. 3 / g, with an average pore size of 5.478nm.

[0084] Example 3

[0085] Catalyst S3 was prepared using a method similar to that in Example 1, except that the amount of support used was different.

[0086] Based on the sum of the mass of the active component and the mass of the support being 100%, the catalyst S3 contains: 35% by weight Ni and 65% by weight Al2O3.

[0087] In catalyst S3, the molar ratio of Ni to N is 1:0.6.

[0088] The specific surface area of ​​catalyst S3 is 341.85 m². 2 / g, with an average pore volume of 0.572m³. 3 / g, with an average pore size of 5.326nm.

[0089] Example 4

[0090] (1) Weigh 55.88 g of aniline and add it to 1000 mL of ethanol. Mix well to obtain a 0.6 mol / L aniline ethanol solution;

[0091] (2) Weigh a certain amount of Al2O3 support, add it to the ethanol solution of aniline, and stir;

[0092] (3) Weigh 106.07 g of nickel acetate, add it to 600 mL of deionized water, dissolve it, and obtain a nickel acetate aqueous solution with a concentration of 1 mol / L;

[0093] (4) While stirring, add the nickel acetate aqueous solution dropwise to the ethanol solution of aniline at a rate of 10 mL / min to obtain a mixture;

[0094] (5) After the addition is complete, the mixture is dried at 120°C for 36 h to obtain the matrix catalyst;

[0095] (6) The matrix catalyst was calcined at 450°C for 4 hours in a nitrogen atmosphere to obtain catalyst S4.

[0096] Based on the sum of the mass of the active component and the mass of the support being 100%, the catalyst S4 contains: 25% by weight Ni and 75% by weight Al2O3.

[0097] In catalyst S4, the molar ratio of Ni to N is 1:0.6.

[0098] The specific surface area of ​​catalyst S4 is 306.44 m². 2 / g, with an average pore volume of 0.637m³. 3 / g, with an average pore size of 6.149nm.

[0099] Example 5

[0100] Catalysts were prepared using a method similar to that in Example 1, except that the amount of support used was different, and catalysts S5 were prepared accordingly.

[0101] Based on the sum of the mass of the active component and the mass of the support being 100%, the catalyst S5 contains: 10% by weight Ni and 90% by weight Al2O3.

[0102] In catalyst S5, the molar ratio of Ni to N is 1:0.6.

[0103] The specific surface area of ​​catalyst S5 is 303.27 m². 2 / g, with an average pore volume of 0.695m³. 3 / g, with an average pore size of 6.342nm.

[0104] Example 6

[0105] Catalyst S6 was prepared using a method similar to that in Example 1, except that the amount of support used was different.

[0106] Based on the sum of the mass of the active component and the mass of the support being 100%, the catalyst S6 contains: 40% by weight Ni and 60% by weight Al2O3.

[0107] In catalyst S6, the molar ratio of Ni to N is 1:0.6.

[0108] The specific surface area of ​​catalyst S6 is 294.18 m². 2 / g, with an average pore volume of 0.714m³. 3 / g, with an average pore size of 6.580nm.

[0109] The amount of carrier added in the above embodiments is shown in Table 1:

[0110] Table 1

[0111]

[0112] Comparative Example 1

[0113] (1) Weigh 174.47 g of nickel nitrate hexahydrate, add it to 600 mL of deionized water, dissolve it, and obtain an aqueous solution of nickel nitrate;

[0114] (2) Under stirring, the nickel nitrate aqueous solution and the same mass of carrier as in Example 1 were mixed to obtain a mixture;

[0115] (3) The mixture was dried at 120°C for 36 h to obtain the matrix catalyst;

[0116] (4) The matrix catalyst was calcined at 450°C for 4 hours in a nitrogen atmosphere to obtain catalyst CS1.

[0117] Based on the sum of the masses of the active components and the support being 100%, the catalyst CS1 contains: 25% by weight Ni and 75% by weight Al2O3. The molar ratio of Ni to N in catalyst CS1 is 1:0.

[0118] The specific surface area of ​​catalyst CS1 is 257.14 m². 2 / g, with an average pore volume of 0.826m³. 3 / g, with an average pore size of 7.345nm.

[0119] Comparative Example 2

[0120] The catalyst was prepared using a method similar to that in Example 1, except that the calcination in this comparative example was carried out in an air atmosphere to prepare catalyst CS2.

[0121] Based on the sum of the masses of the active components and the support being 100%, the catalyst CS2 contains: 25% by weight NiO and 75% by weight Al2O3. The molar ratio of Ni to N elements in catalyst CS2 is 1:0.

[0122] The specific surface area of ​​catalyst CS2 is 263.58 m². 2 / g, with an average pore volume of 0.841m³. 3 / g, with an average pore size of 7.211nm.

[0123] Test Example 1

[0124] The catalysts prepared in the above examples and comparative examples were evaluated for activity using the following methods:

[0125] (1) The catalysts prepared in the above examples and comparative examples were packed into a stainless steel fixed-bed reactor;

[0126] (2) In the presence of the activated catalyst, hydrogen and maleic anhydride are reacted in a contact reaction (this hydrogenation reaction is a continuous reaction), and the liquid hourly space velocity of maleic anhydride is 0.2 h⁻¹. -1 The molar ratio of hydrogen to maleic anhydride was 15:1, and the contact reaction conditions included: reaction temperature 60℃ and pressure 2.0MPa.

[0127] (3) The product after the reaction in step (2) was condensed to obtain a liquid product. The conversion rate of maleic anhydride and the selectivity of succinic anhydride under the catalysis of the catalysts prepared in each example and comparative example were tested. The specific results are shown in Table 2.

[0128] In this invention, the maleic anhydride conversion rate and the succinic anhydride selectivity are calculated using the following formulas:

[0129] (1) Maleic anhydride conversion rate = ;

[0130] (2) Selectivity of succinic anhydride = ;

[0131] Wherein, Mo—the amount of substance of the raw material maleic anhydride, in mol;

[0132] Ma—the amount of maleic anhydride remaining after the reaction, in mol;

[0133] Mi—The amount of succinic anhydride produced after the reaction, in mol.

[0134] Table 2

[0135]

[0136] The results above demonstrate that the catalyst provided by this invention exhibits high activity and selectivity, making it suitable for the hydrogenation of maleic anhydride to succinic anhydride, with both high maleic anhydride conversion and high succinic anhydride selectivity. This hydrogenation reaction is continuous; under the same conversion conditions, a longer reaction time results in a longer catalyst lifetime.

[0137] The catalyst of this invention incorporates a nitrogen-containing compound during its preparation. After calcination of the catalyst matrix, this compound forms a Ni-NC structure with Ni, thereby altering the catalyst's pore structure and improving its performance. Comparative Example 1, however, did not incorporate a nitrogen-containing compound during catalyst preparation, and its corresponding catalyst does not contain a Ni-NC structure. In Comparative Example 2, the catalyst was prepared by calcination in air, where the N and C in aniline were oxidized to NO2 and CO2, respectively, preventing the formation of a Ni-NC structure with the active metal Ni. Therefore, the catalysts prepared in Comparative Example 2 were not as effective as those prepared under an inert atmosphere in the embodiments of this invention.

[0138] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0139] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0140] When this specification uses the prefixes “known to those skilled in the art,” “prior art,” or similar terms to derive materials, substances, methods, steps, apparatus, or components, the objects derived from such prefixes cover those commonly used in the art at the time of this application’s filing, but also include those that are not currently commonly used but will become generally recognized in the art as suitable for similar purposes.

[0141] In the context of this specification, except where expressly stated otherwise, any matters or issues not mentioned shall apply directly to those known in the art without any modification.

Claims

1. A catalyst, characterized in that, The catalyst comprises the following components: The carrier and the active component loaded on the carrier; The active component is Ni, and at least a portion of the Ni element exists in a Ni-NC structure; Based on the sum of the mass of the active component and the mass of the support being 100%, the content of Ni is 10-40% by weight, and the content of the support is 60-90% by weight. The method for preparing the catalyst includes the following steps: (1) The carrier is added to a solution of a nitrogen-containing compound to obtain a mixture A; the nitrogen-containing compound is selected from at least one of aromatic amines or substituted aromatic amines; (2) Add the precursor compound solution of the active component to the mixture A and mix evenly to obtain mixture B; (3) The mixture B is dried and calcined to obtain the catalyst.

2. The catalyst according to claim 1, characterized in that: The support is selected from at least one of Al2O3 and SiO2; and / or, Based on the sum of the mass of the active component and the mass of the support being 100%, the Ni content is 15-35% by weight, and the support content is 65-85% by weight; and / or, The molar ratio of Ni to nitrogen in the catalyst is 1:0.5-2.

3. The catalyst according to claim 2, characterized in that: The molar ratio of Ni to nitrogen in the catalyst is 1:0.5-1.

5.

4. The catalyst according to claim 3, characterized in that: The molar ratio of Ni to nitrogen in the catalyst is 1:0.6-0.

8.

5. The catalyst according to claim 1, characterized in that: The catalyst has a specific surface area of ​​280-380 m². 2 / g; and / or, The catalyst has an average pore size of 3-7 nm.

6. The catalyst according to claim 5, characterized in that: The catalyst has a specific surface area of ​​320-360 m². 2 / g; and / or, The catalyst has an average pore size of 4-6.6 nm.

7. The catalyst according to claim 6, characterized in that: The catalyst has a specific surface area of ​​335-360 m². 2 / g; and / or, The catalyst has an average pore size of 5-6.2 nm.

8. A method for preparing a catalyst, characterized in that, Includes the following steps: (1) The carrier is added to a solution containing a nitrogen compound to obtain mixture A; (2) Add the precursor compound solution of the active component to the mixture A and mix evenly to obtain mixture B; (3) The mixture B is dried and calcined to obtain the catalyst; Used to prepare the catalyst according to any one of claims 1-7.

9. The method for preparing the catalyst according to claim 8, characterized in that: Step (1), The nitrogen-containing compound is selected from at least one of aniline or substituted aniline.

10. The method for preparing the catalyst according to claim 9, characterized in that: The substituted aniline is selected from at least one of N-methylaniline, N-ethylaniline, and 2-hydroxyaniline; and / or, The carrier is selected from at least one of Al2O3 and SiO2.

11. The method for preparing the catalyst according to claim 8, characterized in that: In the solution of the nitrogen-containing compound, The solvent used is an organic solvent; and / or, The concentration of the nitrogen-containing compound is 0.2-1.0 mol / L.

12. The method for preparing the catalyst according to claim 11, characterized in that: The organic solvent is selected from at least one of methanol, ethanol, isopropanol, and acetone.

13. The method for preparing the catalyst according to claim 8, characterized in that: Step (2), The precursor compound solution of the active component is added dropwise to the mixture A; And / or, The precursor compound of the active component is an inorganic salt of nickel; And / or, In the precursor compound solution of the active component, the concentration of the precursor compound is 0.5-1.5 mol / L.

14. The method for preparing the catalyst according to claim 13, characterized in that: Step (2), The dropping rate is 5-20 mL / min; and / or, The inorganic salt of nickel is selected from at least one of nickel nitrate, nickel sulfate, nickel chloride, basic nickel carbonate, and nickel acetate; and / or, In the precursor compound solution of the active component, the concentration of the precursor compound is 0.8-1.2 mol / L.

15. The method for preparing the catalyst according to claim 14, characterized in that: Step (2), The dripping rate is 8-15 mL / min.

16. The method for preparing the catalyst according to claim 8, characterized in that: The molar ratio of the precursor compound to the nitrogen-containing compound of the active component is 1:0.5-2; and / or, Assuming the sum of the mass of the active component in the precursor compound and the mass of the support is 100%, The active component in the precursor compound of the active component has a mass of 10-40% by weight, and the support has a mass of 60-90% by weight.

17. The method for preparing the catalyst according to claim 16, characterized in that: The molar ratio of the precursor compound to the nitrogen-containing compound of the active component is 1:0.5-1.5; and / or, Assuming the sum of the mass of the active component in the precursor compound and the mass of the support is 100%, The active component in the precursor compound of the active component has a mass of 15-35% by weight, and the carrier has a mass of 65-85% by weight.

18. The method for preparing the catalyst according to claim 8, characterized in that: Step (3), The drying temperature is 100-120℃; and / or, The drying time is 24-36 hours; and / or, The calcination temperature is 250-550℃; and / or, The roasting time is 2-6 hours; and / or, The roasting atmosphere is a protective atmosphere.

19. The method for preparing the catalyst according to claim 18, characterized in that: Step (3), The drying temperature is 105-115℃; and / or, The drying time is 28-32 hours; and / or, The calcination temperature is 300-500℃; and / or, The roasting time is 3-5 hours; and / or, The roasting atmosphere is nitrogen and an inert atmosphere.

20. The method for preparing the catalyst according to claim 19, characterized in that: The roasting atmosphere is at least one of nitrogen and helium.

21. The use of a catalyst according to any one of claims 1-7 or a catalyst prepared by any one of claims 8-20 in the hydrogenation of maleic anhydride to succinic anhydride.

22. The application according to claim 21, characterized in that: Application of the catalyst in the continuous hydrogenation of maleic anhydride to succinic anhydride.

23. The application according to claim 21, characterized in that: The conditions for the reaction are: The liquid hourly space velocity (LISH) of maleic anhydride is 0.05–0.4 h⁻¹. -1 ; and / or, The molar ratio of hydrogen to maleic anhydride is 5-25:1; and / or, The temperature for hydrogenation reaction is 40-120℃.

24. The application according to claim 23, characterized in that: The conditions for the reaction are: The liquid hourly space velocity (LISH) of maleic anhydride is 0.1–0.3 h⁻¹. -1 ; and / or, The molar ratio of hydrogen to maleic anhydride is 10-20:1; and / or, The temperature for hydrogenation reaction is 50-80℃.

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