Nitrile rubber hydrogenation catalyst as well as preparation method and application thereof

Abstract

The invention relates to the field of catalysts, and discloses a nitrile rubber hydrogenation catalyst and a preparation method and application thereof.The nitrile rubber hydrogenation catalyst comprises a carrier and an active metal component loaded on the carrier, and the carrier comprises a composite metal oxide and silicon dioxide; wherein the composite metal oxide is M < 1-x > Al < x > O (x + 2) / 2, x is 0.1-0.4, and M is selected from at least one of Mg, Ni and Zn; wherein the active metal component is Os; wherein in terms of metal elements, the content of the active metal component is 0.01-5wt% on the basis of the total weight of the catalyst. The catalyst provided by the invention is used for preparing hydrogenated butadiene-acrylonitrile rubber by hydrogenation of butadiene-acrylonitrile rubber, and has high selectivity and hydrogenation degree.

Description

Technical Field

[0001] The present invention relates to the field of catalysts, and in particular to a catalyst for hydrogenation of nitrile rubber and a preparation method thereof, hydrogenated nitrile rubber and a preparation method thereof. Background Art

[0002] Hydrotalcite compounds include hydrotalcite and hydrotalcite-like compounds. The main body of hydrotalcite is generally composed of two metal hydroxides, so they are also called layered double hydroxyl composite metal oxides (Layered Double Hydroxide, abbreviated as LDH). The intercalation compound of LDH is called intercalation hydrotalcite. Hydrotalcite, hydrotalcite-like compounds and intercalation hydrotalcites are collectively referred to as hydrotalcite-like intercalation materials (LDHs). This type of material is an inorganic material with unique structural characteristics: such as the adjustable variability of elemental composition in a wide range, the adjustable variability of pore structure, and the designability of interlayer intercalation anion types, which lays the foundation for this type of material to become an industrial catalyst or catalyst precursor with potential application prospects. In particular, after high-temperature calcination of this type of material, the laminar metal cations can be transformed into composite metal oxides with spinel structure uniformly dispersed on the molecular scale. Therefore, catalysts or catalyst carriers with specific catalytic properties can be obtained by designing the types and ratios of laminar metal cations.

[0003] Hydrotalcite is directly or indirectly used as a composite oxide catalyst precursor in organic molecular reactions, and has the advantages of high activity, good selectivity, high dispersion of active metal components, and good regeneration repeatability. Hydrotalcite materials are mainly used as catalysts for base catalysis and redox catalysis. In addition, calcined or uncalcined hydrotalcite-like anionic clays can be used as catalyst carriers, so that the catalytic materials loaded on them have higher catalytic activity and selectivity.

[0004] At present, there is no application of hydrotalcite catalysts in the field of preparing hydrogenated nitrile rubber. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of low catalytic activity and poor hydrogenation degree of catalysts for hydrogenation of nitrile rubber in the prior art, and to provide a catalyst for hydrogenation of nitrile rubber and a preparation method and application thereof. When the catalyst for hydrogenation of nitrile rubber of the present invention is applied to hydrogenation of nitrile rubber, it has high catalytic activity, hydrogenation selectivity and hydrogenation degree, and the catalyst is easy to remove and can be recycled.

[0006] In order to achieve the above object, the present invention provides a catalyst for hydrogenation of nitrile rubber in a first aspect, the catalyst comprising a carrier and an active metal component supported on the carrier,

[0007] The carrier comprises a composite metal oxide and silicon dioxide;

[0008] Wherein, the composite metal oxide is M 1-x Al x O (x+2) / 2 , x is 0.1-0.4, M is selected from at least one of Mg, Ni and Zn;

[0009] Wherein, the active metal component is Os;

[0010] Wherein, calculated as metal elements, based on the total weight of the catalyst, the content of active metal components is 0.01-5wt%.

[0011] Preferably, calculated as oxide, based on the weight of the composite metal oxide, the content of silicon dioxide is 1-10 wt%.

[0012] A second aspect of the present invention provides a method for preparing a nitrile rubber hydrogenation catalyst, the method comprising:

[0013] (1) In the presence of an acid solution, a compound having a structure represented by formula (1) is mixed with a silicon dioxide source, and the mixture is molded, dried, and calcined to obtain a carrier;

[0014] (2) loading the active metal component onto the carrier obtained in step (1), and obtaining a nitrile rubber hydrogenation catalyst after drying and calcining;

[0015] [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O (1)

[0016] wherein M is selected from at least one of Mg, Ni and Zn; x is 0.1-0.4; and m is any number from 2 to 9;

[0017] Wherein, the active metal component is Os;

[0018] Wherein, the amount of the active metal component is such that, based on the total weight of the catalyst, the content of the active metal component is 0.01-5 wt %.

[0019] The third aspect of the present invention provides a nitrile rubber hydrogenation catalyst prepared by the preparation method described above.

[0020] A fourth aspect of the present invention provides use of the nitrile rubber hydrogenation catalyst as described above in hydrogenating nitrile rubber to prepare hydrogenated nitrile rubber.

[0021] The carrier of the catalyst for hydrogenation of nitrile rubber described in the present invention comprises a composite metal oxide and silicon dioxide, wherein the composite metal oxide simultaneously comprises aluminum and at least one element selected from Mg, Ni and Zn elements, and the active metal component is Os, and the active metal component has high dispersibility in the carrier, which can effectively improve the catalytic activity of the catalyst, and the catalyst can be recycled and reused.

[0022] When the catalyst for hydrogenation of nitrile rubber is applied to hydrogenation of nitrile rubber, it has high catalytic activity, hydrogenation selectivity and hydrogenation degree, and the catalyst is easy to remove. DETAILED DESCRIPTION

[0023] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0024] The first aspect of the present invention provides a nitrile rubber hydrogenation catalyst, the catalyst comprising a carrier and an active metal component supported on the carrier,

[0025] The carrier comprises a composite metal oxide and silicon dioxide;

[0026] Wherein, the composite metal oxide is M 1-x Al x O (x+2) / 2 , x is 0.1-0.4, M is selected from at least one of Mg, Ni and Zn;

[0027] Wherein, the active metal component is Os;

[0028] Wherein, calculated as metal element, based on the total weight of the catalyst, the content of active metal component is 0.01-5wt%, for example, it can be 0.01, 0.05, 0.1, 0.5, 1, 2, 3, 4, 5wt% and any range between any two values, preferably 0.05-4wt%.

[0029] Preferably, x is 0.17-0.33, for example, it may be 0.17, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.33 and any range between any two values.

[0030] M is selected from at least one of Mg, Ni and Zn. It should be understood that the valence state of M in the composite metal oxide is +2.

[0031] The carrier can be prepared by any conventional method in the art. In a preferred embodiment of the present invention, the carrier is obtained by calcining a mixture of a compound having a structure represented by formula (1) and silicon dioxide.

[0032] [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O (1)

[0033] Wherein, M is selected from at least one of Mg, Ni and Zn; x is 0.1-0.4, preferably 0.17-0.33; and m is any number of 2-9.

[0034] The specific operation of this method can be found in the second aspect and will not be described in detail here.

[0035] Preferably, calculated as oxide, based on the weight of the composite metal oxide, the content of silicon dioxide is 1-10wt%, for example, it can be 1, 2, 4, 6, 8, 10wt% and any range between any two values, more preferably 2-8wt%.

[0036] A second aspect of the present invention provides a method for preparing a nitrile rubber hydrogenation catalyst, the method comprising:

[0037] (1) In the presence of an acid solution, a compound having a structure represented by formula (1) is mixed with a silicon dioxide source, and the mixture is molded, dried, and calcined to obtain a carrier;

[0038] (2) loading the active metal component onto the carrier obtained in step (1), and obtaining a nitrile rubber hydrogenation catalyst after drying and calcining;

[0039] [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O (1)

[0040] Wherein, M is selected from at least one of Mg, Ni and Zn; x is 0.1-0.4, preferably 0.17-0.33, for example, 0.17, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.33 and any range between any two values; and m is any number from 2 to 9, for example, 2, 3, 4, 5, 6, 7, 8, 9 and any range between any two values;

[0041] Wherein, the active metal component is Os;

[0042] Wherein, the amount of the active metal component used is such that, based on the total weight of the catalyst, the content of the active metal component is 0.01-5wt%, preferably 0.05-4wt%.

[0043] The acid solution may be an acid solution commonly used in the art. Preferably, the acid solution is a nitric acid solution.

[0044] The amount of the acid solution can be selected within a wide range. Preferably, the amount of the acid solution is 10-30 parts by weight relative to 100 parts by weight of the mixture of the compound of formula (1) and the silicon dioxide source.

[0045] The compound having the structure shown in formula (1) used in the present invention can be a commercial product or can be prepared according to the prior art, and its preparation technology is known to those skilled in the art, such as coprecipitation method, nucleation crystallization / isolation method, non-equilibrium crystallization method or hydrothermal synthesis method, etc. The obtained product is usually a nano-scale or submicron-scale layered dihydroxy composite metal oxide particle.

[0046] In a preferred embodiment of the present invention, the compound having the structure shown in formula (1) is prepared by a method comprising the following steps:

[0047] a) Al 3+ Water-soluble salts and M 2+ The water-soluble salt of isocyanate is mixed in the presence of an alkaline precipitant (such as NaOH and / or sodium carbonate) or urea to obtain a mixed slurry, the obtained mixed slurry is added to a crystallization kettle and stirred for crystallization to obtain a crystallized product, and then the obtained crystallized product is fully washed with deionized water to make the pH of the supernatant 7-8, and then dried at a temperature of 50-160° C. to obtain a dry product, which has a structure shown in formula (1).

[0048] As trivalent metal ion Al 3+ Water-soluble salts of 3+ Nitrates, sulfates, chlorides, basic carbonates, etc., preferably nitrates.

[0049] As divalent metal ions M 2+ The water-soluble salts of 2+ Nitrates, sulfates, chlorides, basic carbonates, etc., preferably nitrates.

[0050] As the alkaline precipitant, any alkaline precipitant that can convert trivalent metal ions Al 3+ Water-soluble salts and divalent metal ions M 2+The water-soluble salt of the precipitant is preferably an alkaline agent; preferably, a combination of an alkali and a carbonate is used. For example, the alkali can be sodium hydroxide, potassium hydroxide, ammonia water, etc., and the carbonate can be sodium carbonate, potassium carbonate, etc. Urea can also be used instead of the alkali and carbonate. The amount of the alkaline precipitant or urea can be selected within a wide range, as long as it can make Al 3+ Water-soluble salts and M 2+ The water-soluble salt can be precipitated.

[0051] The silicon dioxide source described in the present invention is silicon dioxide, which can be a commercially available product.

[0052] Preferably, calculated as oxide, based on the weight of the composite metal oxide, the amount of silicon dioxide is 1-10wt%, for example, 1, 2, 4, 6, 8, 10wt% and any range between any two values, preferably 2-8wt%.

[0053] The forming, drying and calcining methods can be any method in the art, and those skilled in the art can choose according to their needs, which will not be described in detail here.

[0054] Preferably, in step (1), the drying conditions include: temperature of 100-160° C. and time of 2-24 h.

[0055] Preferably, in step (1), the calcination conditions include: temperature of 400-600° C. and time of 2-24 h.

[0056] The method for loading the active metal component onto the carrier obtained in step (1) can be a conventional method in the art, such as the active metal component can be loaded onto the carrier by an impregnation method to obtain a nitrile rubber hydrogenation catalyst, which is conventional for those skilled in the art, such as the loading method described in CN1911242A, which is incorporated herein by reference.

[0057] The active metal component can be loaded onto the support by impregnation in the form of an aqueous solution of its inorganic salt. Preferably, the inorganic salt of the active metal component is osmium chloride.

[0058] Preferably, in the aqueous solution of the inorganic salt of the active metal component, the content of the inorganic salt of the active metal component is 0.5-50 g / L, for example, it can be 0.5, 1, 5, 10, 15, 20, 30, 40, 50 g / L and any range between any two values.

[0059] Preferably, the immersion time is 6-12 hours.

[0060] Preferably, in step (2), the drying conditions include: a temperature of 100-160°C, for example, 100, 110, 120, 130, 140, 150, 160°C and any range between any two values, and a time of 2-24h, for example, 2, 6, 10, 14, 18, 20, 24h and any range between any two values.

[0061] Preferably, in step (2), the calcination conditions include: a temperature of 400-600°C, for example, 400, 450, 500, 550, 600°C and any range between any two values; a calcination time of 2-24h, for example, 2, 6, 10, 14, 18, 20, 24h and any range between any two values.

[0062] The third aspect of the present invention provides a nitrile rubber hydrogenation catalyst prepared by the preparation method described above.

[0063] A fourth aspect of the present invention provides use of the nitrile rubber hydrogenation catalyst as described above in hydrogenating nitrile rubber to prepare hydrogenated nitrile rubber.

[0064] In a preferred embodiment of the present invention, the preparation method of hydrogenated nitrile rubber comprises:

[0065] a. dissolving the nitrile rubber in an organic solvent to obtain a nitrile rubber solution;

[0066] b. In the presence of a catalyst for hydrogenation of nitrile rubber, the rubber solution is subjected to a hydrogenation reaction to obtain a hydrogenated nitrile rubber rubber solution;

[0067] c, separating the hydrogenated nitrile rubber solution to obtain hydrogenated nitrile rubber;

[0068] The catalyst for hydrogenation of nitrile rubber is the catalyst for hydrogenation of nitrile rubber provided in the first aspect of the present invention and the third aspect of the present invention.

[0069] In the present invention, there is no particular limitation on the organic solvent, and it can be any conventional organic solvent in the art, such as methanol, ethanol, toluene, chlorobenzene, acetone, etc. Chlorobenzene is preferred in the present invention.

[0070] Furthermore, dissolving the nitrile rubber in an organic solvent can improve the dispersibility of the nitrile rubber, further improve the smooth progress of the hydrogenation reaction, and improve the hydrogenation degree and hydrogenation selectivity.

[0071] In the present invention, there is no particular limitation on the usage of the organic solvent and the nitrile rubber, as long as the organic solvent can dissolve the nitrile rubber.

[0072] According to the present invention, based on the mass of the nitrile rubber, the amount of the catalyst for hydrogenation of the nitrile rubber is 0.1-10wt%.

[0073] In the present invention, when the amount of the catalyst for hydrogenation of nitrile rubber meets the above range, a product with a higher degree of hydrogenation can be obtained while reducing the cost.

[0074] Furthermore, based on the mass of the nitrile rubber, the amount of the catalyst for hydrogenation of the nitrile rubber is 0.3-10wt%.

[0075] According to the present invention, the conditions of the hydrogenation reaction include: temperature of 50-200° C., hydrogen pressure of 2-10 MPa, and time of 2-18 h.

[0076] According to the present invention, there is no particular limitation on the separation method of the hydrogenated nitrile rubber solution, and it may be centrifugal separation, filtration, etc.

[0077] In the present invention, the method further comprises evaporating or drying the liquid after separating the hydrogenated nitrile rubber liquid.

[0078] According to a specific implementation of the present invention, the following steps are included:

[0079] (1) dissolving the nitrile rubber in an organic solvent to obtain a hydrogenated nitrile rubber solution;

[0080] (2) adding the catalyst for hydrogenation of nitrile rubber provided by the first aspect and / or the third aspect of the present invention to the rubber solution, and performing a catalytic hydrogenation reaction at 50-200° C. and a hydrogen pressure of 2-10 MPa for 2-18 hours to obtain a hydrogenated nitrile rubber solution, wherein the amount of the catalyst for hydrogenation of nitrile rubber added is 0.1-10 wt% of the mass of the hydrogenated nitrile rubber;

[0081] The solution is centrifuged and the liquid is evaporated to obtain hydrogenated nitrile rubber.

[0082] The present invention will be described in detail below by way of examples. In the following examples,

[0083] The degree of hydrogenation was measured by hydrogen nuclear magnetic resonance (HNMR) method;

[0084] The hydrogenation selectivity was measured by infrared spectroscopy (FT-IR);

[0085] The content of active components was measured by inductively coupled plasma spectrometer (IPC) method;

[0086] The following raw materials are all commercially available.

[0087] Preparation Example 1

[0088] This preparation example is used to illustrate the preparation method of the compound having the structure represented by formula (1).

[0089] [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O (1)

[0090] Weigh 61.51g Mg(NO3)2·6H2O and 45.03g Al(NO3)3·9H2O and dissolve them in deionized water to prepare 300mL mixed salt solution; then weigh 23.03g NaOH and 25.43g Na2CO3 and dissolve them in deionized water to prepare 300mL mixed alkali solution. Add the above two mixed solutions into the full backmixed liquid membrane reactor at the same time, adjust the slit width between the reactor rotor and the stator to 0.02mm, the working voltage to 100V, the rotor speed to 4500rpm, and mix for 2-3min to obtain a mixed slurry. Add the obtained mixed slurry into the crystallization kettle and stir, keep the temperature of the mixed slurry in the kettle at 100℃ and reflux crystallize for 6 hours to obtain a crystallized product. Wash the crystallized product thoroughly with deionized water to make the pH of the supernatant 7-8, and then dry it at 120℃ for 12 hours to obtain Mg4Al2(OH) 12 The compound shown by CO3·6H2O.

[0091] Preparation Example 2

[0092] This preparation example is used to illustrate the preparation method of the compound having the structure represented by formula (1).

[0093] [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O (1)

[0094] The operation was carried out according to the method described in Preparation Example 1, except that 71.38 g Zn(NO3) was used. 2· 6H2O replaces 61.51g Mg(NO3)2·6H2O to obtain Zn4Al2(OH) 12 The compound shown by CO3·6H2O.

[0095] Preparation Example 3

[0096] This preparation example is used to illustrate the preparation method of the compound having the structure represented by formula (1).

[0097] [M 2+1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O(1)

[0098] The method described in Preparation Example 1 was followed except that 69.77 g Ni(NO3) was used. 2· 6H2O replaces 61.51g Mg(NO3)2·6H2O to obtain Ni4Al2(OH) 12 The compound shown by CO3·6H2O.

[0099] Preparation Example 4

[0100] This preparation example is used to illustrate the preparation method of the compound having the structure represented by formula (1).

[0101] [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O(1)

[0102] The method described in Preparation Example 1 was followed except that 92.26 g of Mg(NO3)2·6H2O was used instead of 61.51 g of Mg(NO3)2·6H2O to obtain Mg6Al2(OH) 16 The compound shown by CO3·4H2O.

[0103] Examples 1-7

[0104] This example is used to illustrate the preparation method of the nitrile rubber hydrogenation catalyst of the present invention.

[0105] The compound having the structure shown in formula (1) was mixed with silicon dioxide, and a nitric acid solution with a concentration of 2wt% was added and kneaded, and extruded into strips, wherein the amount of the nitric acid solution added was 20wt% of the solid mixture. Then, the mixture was dried at 120°C and calcined at 500°C for 4h to obtain a carrier. The carrier was immersed in a 0.2mol / L osmium chloride solution for 8 hours, washed, dried at 120°C, and calcined at 500°C for 12h to obtain nitrile rubber hydrogenation catalysts Y1-Y7, the composition of which is shown in Table 1.

[0106] Comparative Examples 1-3

[0107] This comparative example is used to illustrate the preparation method of a reference nitrile rubber hydrogenation catalyst.

[0108] The operation was carried out according to the method described in Example 1, except that SiO2 was not used. The compositions of catalysts DY1-DY3 are shown in Table 1. The results of isobutane conversion and isobutene selectivity of the obtained catalysts are shown in Table 1.

[0109] Test Example 1

[0110] 2 g of nitrile rubber was dissolved in 100 mL of chlorobenzene solvent to obtain a rubber solution. 0.1 g of the catalyst for hydrogenation of nitrile rubber prepared in Example 1-7 or Comparative Example 1-3 was added to the rubber solution. A catalytic hydrogenation reaction was carried out in a high-pressure hydrogenation reactor at 100° C. and a hydrogen pressure of 6 MPa for 5 h. After the reaction was completed, the catalyst was recovered by centrifugation (the recovered catalyst can be reused), and the hydrogenated nitrile rubber product was obtained after removing the solvent.

[0111] Among them, the hydrogenation degree and hydrogenation selectivity of nitrile rubber are shown in Table 1.

[0112] Table 1

[0113]

[0114]

[0115] Test Example 2

[0116] The catalyst obtained by centrifugal separation after the reaction in Test Example 1 was placed in an organic solvent acetone, stirred and washed for 6 hours, and centrifuged. The catalyst was added back into the reaction system under the same reaction conditions as in Test Example 1, and the hydrogenation performance of the recovered catalyst was investigated. See Table 2.

[0117] Test Example 3

[0118] The catalyst after the reaction in Test Example 2 was recovered by centrifugation, washed with stirring in an organic solvent acetone for 6 hours, and centrifuged. The catalyst was added back into the reaction system under the same reaction conditions as in Test Example 1, and the hydrogenation performance of the recovered catalyst was investigated. See Table 2.

[0119] Test Example 4

[0120] The catalyst after the reaction in Test Example 3 was recovered by centrifugation, washed with stirring in an organic solvent acetone for 6 hours, and centrifuged. The catalyst was added back into the reaction system under the same reaction conditions as in Test Example 1, and the hydrogenation performance of the recovered catalyst was investigated. See Table 2.

[0121] Test Example 5

[0122] The catalyst after the reaction in Test Example 4 was recovered by centrifugation, washed with stirring in an organic solvent acetone for 6 hours, and centrifuged. The catalyst was added back into the reaction system under the same reaction conditions as in Test Example 1, and the hydrogenation performance of the recovered catalyst was investigated. See Table 2.

[0123] Table 2

[0124]

[0125]

[0126] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A nitrile rubber hydrogenation catalyst, characterized in that The catalyst comprises a carrier and an active metal component supported on the carrier. The carrier comprises a composite metal oxide and silicon dioxide; Wherein, the composite metal oxide is M 1-x Al x O (x+2) / 2 , x is 0.1-0.4, M is selected from at least one of Mg, Ni and Zn; Wherein, the active metal component is Os; Wherein, calculated as metal elements, based on the total weight of the catalyst, the content of active metal components is 0.01-5wt%.

2. The catalyst according to claim 1, wherein Calculated as metal elements, the content of active metal components is 0.05-4 wt % based on the total weight of the catalyst.

3. The catalyst according to claim 1 or 2, wherein x is 0.17-0.

33.

4. The catalyst according to claim 1, wherein The carrier is obtained by calcining an acidic mixture of a compound having a structure represented by formula (1) and silicon dioxide. [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O(1) wherein M is selected from at least one of Mg, Ni and Zn; x is 0.1-0.4, preferably 0.17-0.33; and m is any number from 2 to 9; Preferably, the calcination conditions include: a temperature of 400-600° C. and a time of 2-24 h.

5. The catalyst according to claim 1, wherein Calculated as oxide, based on the weight of the composite metal oxide, the content of silicon dioxide is 1-10wt%, preferably 2-8wt%.

6. A method for preparing a nitrile rubber hydrogenation catalyst, characterized in that: The method includes: (1) In the presence of an acid solution, a compound having a structure represented by formula (1) is mixed with a silicon dioxide source, and the mixture is molded, dried, and calcined to obtain a carrier; (2) loading the active metal component onto the carrier obtained in step (1), and obtaining a nitrile rubber hydrogenation catalyst after drying and calcining; [M 2+ 1-x Al x (OH)2] x+ ·(CO3 2- ) x / 2 ·mH2O (1) wherein M is selected from at least one of Mg, Ni and Zn; x is 0.1-0.4, preferably 0.17-0.33; and m is any number from 2 to 9; Wherein, the active metal component is Os; Wherein, the amount of the active metal component used is such that, based on the total weight of the catalyst, the content of the active metal component is 0.01-5wt%, preferably 0.05-4wt%.

7. The preparation method according to claim 6, wherein: The acid solution is a nitric acid solution.

8. The preparation method according to claim 6, wherein: Calculated as oxide, based on the weight of the composite metal oxide, the amount of silicon dioxide used is 1-10wt%, preferably 2-8wt%.

9. The preparation method according to claim 6, wherein: In step (1), the drying conditions include: a temperature of 100-160° C. and a time of 2-24 h; and / or The calcination conditions include: a temperature of 400-600° C. and a time of 2-24 hours.

10. The preparation method according to claim 6, wherein: In step (2), the drying conditions include: a temperature of 100-160° C. and a time of 2-24 h; and / or The calcination conditions include: a temperature of 400-600° C. and a calcination time of 2-24 hours.

11. The nitrile rubber hydrogenation catalyst prepared by the preparation method according to any one of claims 6 to 10.

12. Use of the nitrile rubber hydrogenation catalyst described in any one of claims 1 to 5 and 11 in preparing hydrogenated nitrile rubber by hydrogenating nitrile rubber.

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