Dimethyl oxalate decarbonylation catalyst as well as preparation method and application thereof

Abstract

The invention relates to the technical field of chemical engineering, in particular to a dimethyl oxalate decarbonylation catalyst and a preparation method and application thereof. A catalyst comprising a carrier; the active component is loaded on the carrier; the active component is one or more of Co, Ni and Pd; the loading capacity of the active component is 0.1%-5%. The preparation method of the catalyst comprises the following steps: S1, pretreating the carrier; s2, dipping the pretreated carrier in a transition metal salt solution, and after dipping, obtaining a first precursor loading body; s3, slowly drying the first precursor loading body, heating and continuously drying to obtain a second precursor loading body; the transition metal salt is one or more of nickel nitrate, palladium chloride and cobalt nitrate; and S4, under the protection of nitrogen, carrying out high-temperature roasting on the second precursor carrier to obtain the catalyst. The catalyst can be used for catalyzing decarbonylation reaction of dimethyl oxalate to prepare dimethyl carbonate, the conversion rate of dimethyl oxalate can reach 95% or above, the highest conversion rate can reach 100%, and the yield of dimethyl carbonate exceeds 90%.

Description

Technical Field

[0001] This invention relates to the field of chemical technology, and more specifically, to a dimethyl oxalate decarbonylation catalyst, its preparation method, and its application. Background Technology

[0002] Dimethyl carbonate (DMC), as an important organic chemical raw material and intermediate, possesses excellent non-toxic and environmentally friendly properties, and has wide applications in numerous fields, such as being used as a green and environmentally friendly solvent for paints and coatings, in the preparation of fine chemicals for pharmaceuticals and pesticides, as a gasoline and diesel additive, as a substitute for phosgene in the synthesis of polycarbonate, and as an electrolyte for lithium-ion batteries in the new energy field. With the continuous growth of market demand for DMC, developing efficient, economical, and environmentally friendly synthesis processes and catalysts has become a top priority.

[0003] Currently, the main methods for synthesizing dimethyl carbonate (DMC) include the phosgene method, transesterification, and methanol oxidative carbonylation. However, these methods all have some problems, such as the highly toxicity of the phosgene raw material, the need for large amounts of ethylene glycol in the transesterification method and the difficulty in separation, and the high equipment requirements and selectivity of the methanol oxidative carbonylation method. Dimethyl oxalate (DMO), as an intermediate product in the coal chemical route for ethylene glycol synthesis, is also subject to overcapacity due to the overcapacity of coal-based ethylene glycol production. Converting DMO into high-value-added DMC can not only solve the DMO overcapacity problem but also alleviate the tight supply and demand situation in the DMC market, which has significant economic and strategic importance.

[0004] In recent years, research on the decarbonylation of DMO to DMC has gradually increased, and several related catalyst patents have been published. For example, patent application CN114082430A discloses a decarbonylation catalyst for dimethyl oxalate and a process for producing battery-grade dimethyl carbonate. The catalyst uses activated carbon or all-silica molecular sieves as supports, loaded with alkali metal carbonates and transition metal oxide active agents. While this improves the DMO conversion rate and DMC selectivity to some extent, there is still room for improvement. Patent application CN117680201A discloses a catalyst for the directional decarbonylation of dimethyl oxalate to dimethyl carbonate, using a metal-organic framework material as a support, loaded with alkali metal compounds and alkaline earth metal compounds. It exhibits good activity and selectivity; however, the cost of metal-organic framework materials is relatively high, and their stability and recyclability in large-scale industrial applications require further verification. Patent application CN117583008A discloses a catalyst and its preparation method for the gas-phase decarbonylation of dimethyl oxalate to dimethyl carbonate. The catalyst uses active alumina as a support and loads alkali metal carbonates and transition metal carbonates, exhibiting good gas-phase decarbonylation catalytic performance. However, the performance of this catalyst in liquid-phase decarbonylation reactions and its adaptability to reaction facilities of different scales need to be further investigated. Summary of the Invention

[0005] This invention addresses the problems of low conversion rate, high cost, and insufficient adaptability to different reaction conditions and equipment in existing catalysts for the decarbonylation of dimethyl oxalate to dimethyl carbonate. It provides a decarbonylation catalyst for dimethyl oxalate, its preparation method, and its application.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a dimethyl oxalate decarbonylation catalyst, comprising a support and an active component supported on the support; The active component is one or more of Co, Ni and Pd; the loading of the active component is 0.1% to 5%.

[0007] In a preferred embodiment, the carrier is one or more of activated carbon, silica gel, and molecular sieve.

[0008] In a preferred embodiment, the carrier is activated carbon, and the active component is Ni.

[0009] In a preferred embodiment, the particle size of the active component is 3-5 nm.

[0010] A second aspect of the present invention provides a method for preparing the dimethyl oxalate decarbonylation catalyst according to any of the above embodiments, comprising the following steps: S1. The carrier is soaked in an acidic solution, washed until neutral, and then treated at a high temperature of 600~900℃ under a nitrogen atmosphere to obtain the pretreated carrier; S2. The pretreated carrier is immersed in a transition metal salt solution. After immersion, the first precursor load is obtained. S3. The first precursor load is slowly dried at 60~90℃, and then the temperature is raised to 180~220℃ to continue drying to obtain the second precursor load; S4. Under nitrogen protection, the second precursor support was calcined at high temperature to obtain the dimethyl oxalate decarbonylation catalyst; The transition metal salt solution is one or more of nickel nitrate solution, palladium chloride solution, and cobalt nitrate solution.

[0011] In the preferred embodiment, in step S1, the high-temperature treatment time is 3 hours; in step S4, when the support is silica gel or molecular sieve, after the second precursor support is calcined at high temperature, 5% H2 is introduced to carry out a reduction reaction, and after the reaction is completed, the dimethyl oxalate decarbonylation catalyst is obtained.

[0012] In a preferred embodiment, in step S2, the mass ratio of the carrier to the transition metal salt solution is 1:(0.2~0.4), and the concentration of the transition metal salt solution is 0.024~4.26 mol / L (e.g., 0.024 mol / L, 0.025 mol / L, 0.1 mol / L, 0.3 mol / L, 0.5 mol / L, 0.8 mol / L, 1 mol / L, 2 mol / L, 3 mol / L, 4 mol / L, 4.26 mol / L, etc.).

[0013] In the preferred embodiment, in step S4, the high-temperature calcination temperature is 300~600℃ and the time is 2~5h.

[0014] A second aspect of the present invention provides an application of a dimethyl oxalate decarbonylation catalyst prepared by any of the above methods, characterized in that it is used to catalyze the decarbonylation of dimethyl oxalate to prepare dimethyl carbonate.

[0015] In the preferred embodiment, in the above application, the catalytic process includes a decarbonylation reaction of dimethyl oxalate in a fixed-bed reactor using a catalyst, wherein the liquid hourly space velocity (LHSV) of dimethyl oxalate is 0.5 h⁻¹. -1 .

[0016] The beneficial effects of this invention are as follows: The catalyst provided by this invention can be used to catalyze the decarbonylation reaction of dimethyl oxalate to prepare dimethyl carbonate. The conversion rate of dimethyl oxalate can reach more than 95%, and can be as high as 100%. The yield of dimethyl carbonate exceeds 90%, exhibiting excellent catalytic performance. Moreover, the catalyst has good stability and recyclability, and can be applied to different industrial production scales and reaction facilities. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0018] Unless otherwise stated, scientific and technical terms used herein have the meanings commonly understood by those skilled in the art. Unless otherwise specified, the experimental methods used in the examples are conventional methods. Where specific conditions are not specified in the examples, they should be performed under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0019] Example 1: Activated carbon + Ni (precursor: nickel nitrate) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Carrier pretreatment: Activated carbon was placed in 1 mol / L HNO3 solution and soaked for 4 h. After washing with pure water until neutral, it was placed in a muffle furnace and treated at 800℃ for 3 h under a nitrogen atmosphere.

[0020] S2. Equal volume impregnation: Dissolve nickel nitrate in deionized water to obtain a 2.13 mol / L nickel nitrate solution; impregnate the pretreated activated carbon in the nickel nitrate solution at a mass ratio of 1:0.4 to ensure that the support fully adsorbs the nickel nitrate component in the impregnation solution, thus obtaining the first precursor support.

[0021] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of nickel nitrate on the support, thus obtaining the second precursor support.

[0022] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 400°C at a rate of 10°C / min under nitrogen protection. The calcination is carried out for 3 hours to reduce nickel nitrate to nickel particles with a particle size of about 4 nm. The nickel particles are then loaded onto an activated carbon support to obtain the target catalyst with a loading of 5%, which is designated as catalyst 1.

[0023] Example 2: Activated carbon + Pd (precursor: palladium chloride) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Carrier pretreatment: Activated carbon was placed in 1 mol / L HNO3 solution and soaked for 4 h. After washing with pure water until neutral, it was placed in a muffle furnace and treated at 800℃ for 3 h under nitrogen atmosphere.

[0024] S2. Equal volume impregnation: Dissolve palladium chloride in deionized water to obtain a 0.024 mol / L palladium chloride solution; impregnate the pretreated activated carbon in the palladium chloride solution at a mass ratio of 1:0.4 to ensure that the support fully adsorbs the palladium chloride component in the impregnation solution, thus obtaining the first precursor support.

[0025] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of palladium chloride on the support, thus obtaining the second precursor support.

[0026] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 400°C at a heating rate of 10°C / min under nitrogen protection. The calcination is carried out for 3 hours to reduce palladium chloride to palladium particles with a particle size of about 4 nm. The particles are then loaded onto an activated carbon support to obtain the target catalyst with a loading of 0.1%, which is denoted as catalyst 2.

[0027] Example 3: Activated carbon + Co (precursor: cobalt nitrate) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Carrier pretreatment: Activated carbon was placed in 1 mol / L HNO3 solution and soaked for 4 h. After washing with pure water until neutral, it was placed in a muffle furnace and treated at 800℃ for 3 h under a nitrogen atmosphere.

[0028] S2. Equal volume impregnation: Dissolve cobalt nitrate in deionized water to obtain a 1.06 mol / L cobalt nitrate solution; impregnate the pretreated activated carbon in the cobalt nitrate solution at a mass ratio of 1:0.4 to ensure that the support fully adsorbs the cobalt nitrate component in the impregnation solution, thus obtaining the first precursor support.

[0029] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of cobalt nitrate on the support, thus obtaining the second precursor support.

[0030] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 400°C at a heating rate of 10°C / min under nitrogen protection. The mixture is calcined for 3 hours to reduce cobalt nitrate to cobalt particles with a particle size of about 4 nm. The cobalt particles are then loaded onto an activated carbon support to obtain the target catalyst with a loading of 2.5%, which is designated as catalyst 3.

[0031] Example 4: Silica gel + Ni (precursor: nickel nitrate) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Carrier pretreatment: Place the silica gel in a 1 mol / L HNO3 solution and soak for 4 hours. Then wash with pure water until neutral and place in a muffle furnace. Treat at 900℃ for 3 hours under a nitrogen atmosphere.

[0032] S2. Equal volume impregnation: Dissolve nickel nitrate in deionized water to obtain a 2.13 mol / L nickel nitrate solution; impregnate the pretreated silica gel in the nickel nitrate solution at a mass ratio of 1:0.4 to ensure that the carrier fully adsorbs the nickel nitrate component in the impregnation solution, thus obtaining the first precursor support.

[0033] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of nickel nitrate on the support, thus obtaining the second precursor support.

[0034] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 300°C at a rate of 10°C / min under nitrogen protection. It is calcined for 5 hours and then reduced by 5% H2 for 2 hours. The active component is reduced to nickel particles with a particle size of about 4 nm and loaded onto a silica gel support to obtain the target catalyst with a loading of 5%, which is denoted as catalyst 4.

[0035] Example 5: Silica gel + Pd (precursor: palladium chloride) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Carrier pretreatment: Place the silica gel in a 1 mol / L HNO3 solution and soak for 4 hours. Then wash with pure water until neutral and place in a muffle furnace. Treat at 900℃ for 3 hours under a nitrogen atmosphere.

[0036] S2. Equal volume impregnation: Dissolve palladium chloride in deionized water to obtain a 0.024 mol / L palladium chloride solution; impregnate the pretreated silica gel in the palladium chloride solution at a mass ratio of 1:0.4 to ensure that the support fully adsorbs the palladium chloride component in the impregnation solution, thus obtaining the first precursor support.

[0037] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of palladium chloride on the support, thus obtaining the second precursor support.

[0038] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 300°C at a rate of 10°C / min under nitrogen protection. It is calcined for 5 hours and then reduced by 5% H2 for 2 hours. The active component is reduced to palladium particles with a particle size of about 4 nm and loaded onto a silica gel support to obtain the target catalyst with a loading of 0.1%, which is denoted as catalyst 5.

[0039] Example 6: Silica gel + Co (precursor: cobalt nitrate) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Carrier pretreatment: Place the silica gel in a 1 mol / L HNO3 solution and soak for 4 hours. Then wash with pure water until neutral and place in a muffle furnace. Treat at 900℃ for 3 hours under a nitrogen atmosphere.

[0040] S2. Equal volume impregnation: Dissolve cobalt nitrate in deionized water to obtain a 1.06 mol / L cobalt nitrate solution; impregnate the pretreated silica gel in the cobalt nitrate solution at a mass ratio of 1:0.4 to ensure that the support fully adsorbs the cobalt nitrate component in the impregnation solution, thus obtaining the first precursor support.

[0041] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of cobalt nitrate on the support, thus obtaining the second precursor support.

[0042] S4. High-temperature calcination: The second precursor support was transferred into an atmosphere furnace and heated to 300°C at a rate of 10°C / min under nitrogen protection. It was calcined for 5 hours and then reduced by 5% H2 for 2 hours. The active component was reduced to cobalt particles with a particle size of about 4 nm and loaded onto a silica gel support to obtain the target catalyst with a loading of 2.5%, which is designated as catalyst 6.

[0043] Example 7: Molecular sieve + Ni (precursor: nickel nitrate) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Support pretreatment: The molecular sieve was placed in a 1 mol / L HNO3 solution and soaked for 4 h. After washing with pure water until neutral, it was placed in a muffle furnace and treated at 600℃ for 3 h under a nitrogen atmosphere.

[0044] S2. Equal volume impregnation: Dissolve nickel nitrate in deionized water to obtain a 4.26 mol / L nickel nitrate solution; impregnate the pretreated molecular sieve in the nickel nitrate solution at a mass ratio of 1:0.2 to ensure that the support fully adsorbs the nickel nitrate component in the impregnation solution, thus obtaining the first precursor support.

[0045] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of nickel nitrate on the support, thus obtaining the second precursor support.

[0046] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 600°C at a rate of 10°C / min under nitrogen protection. It is calcined for 2 hours and then reduced by 5% H2 for 2 hours. The active component is reduced to nickel particles with a particle size of about 4 nm and loaded onto a molecular sieve support to obtain the target catalyst with a loading of 5%, which is designated as catalyst 7.

[0047] Example 8: Molecular sieve + Pd (precursor: palladium chloride) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Support pretreatment: The molecular sieve was placed in a 1 mol / L HNO3 solution and soaked for 4 h. After washing with pure water until neutral, it was placed in a muffle furnace and treated at 600℃ for 3 h under a nitrogen atmosphere.

[0048] S2. Equal volume impregnation: Dissolve palladium chloride in deionized water to obtain a 0.048 mol / L palladium chloride solution; impregnate the pretreated molecular sieve in the palladium chloride solution at a mass ratio of 1:0.2 to ensure that the support fully adsorbs the palladium chloride component in the impregnation solution, thus obtaining the first precursor support.

[0049] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of palladium chloride on the support, thus obtaining the second precursor support.

[0050] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 600°C at a rate of 10°C / min under nitrogen protection. It is calcined for 2 hours and then reduced by 5% H2 for 2 hours. The active component is reduced to palladium particles with a particle size of about 4 nm and loaded onto a molecular sieve support to obtain the target catalyst with a loading of 0.1%, which is designated as catalyst 8.

[0051] Example 9: Molecular sieve + Co (precursor: cobalt nitrate) A method for preparing a dimethyl oxalate decarbonylation catalyst includes the following steps: S1. Support pretreatment: The molecular sieve was placed in a 1 mol / L HNO3 solution and soaked for 4 h. After washing with pure water until neutral, it was placed in a muffle furnace and treated at 600℃ for 3 h under a nitrogen atmosphere.

[0052] S2. Equal volume impregnation: Dissolve cobalt nitrate in deionized water to obtain a 2.12 mol / L cobalt nitrate solution; impregnate the pretreated molecular sieve in the cobalt nitrate solution at a mass ratio of 1:0.2 to ensure that the support fully adsorbs the cobalt nitrate component in the impregnation solution, thus obtaining the first precursor support.

[0053] S3. Drying and baking: The first precursor support is slowly dried at 80°C for 12 hours, and then the temperature is raised to 200°C and dried for another 4 hours to form a uniform precursor coating of cobalt nitrate on the support, thus obtaining the second precursor support.

[0054] S4. High-temperature calcination: The second precursor support is transferred into an atmosphere furnace and heated to 600°C at a rate of 10°C / min under nitrogen protection. It is calcined for 2 hours and then reduced by 5% H2 for 2 hours. The active component is reduced to cobalt particles with a particle size of about 4 nm and loaded onto a molecular sieve support to obtain the target catalyst with a loading of 2.5%, which is designated as catalyst 9.

[0055] Example 10: Activated carbon + Ni (precursor: nickel nitrate) The preparation process of this comparative example is basically the same as that of Example 1, except that in step S2, nickel nitrate is dissolved in deionized water to obtain a 1.065 mol / L nickel nitrate solution; the pretreated activated carbon is impregnated in the nickel nitrate solution at a mass ratio of 1:0.4 to ensure that the support fully adsorbs the nickel nitrate component in the impregnation solution, thus obtaining the first precursor support. The obtained target catalyst is designated as catalyst 10.

[0056] Comparative Example 1 The preparation process of this comparative example is basically the same as that of Example 1, except that in step S1, activated carbon is placed in a 1 mol / L HNO3 solution, soaked for 4 hours, washed with pure water until neutral, and then treated at 120°C for 3 hours under a nitrogen atmosphere. The resulting target catalyst is designated as catalyst 11.

[0057] Test case The dimethyl oxalate decarbonylation catalysts prepared in Examples 1-10 and Comparative Example 1 were subjected to catalytic reactions under the same reaction conditions. The reaction conditions were: fixed-bed reactor, reaction temperature 230°C, and dimethyl oxalate liquid hourly space velocity 0.5 h⁻¹. -1 The reaction products were collected periodically, and their composition was analyzed by gas chromatography. The conversion rate of dimethyl oxalate (DMO) and the yield of dimethyl carbonate (DMC) were calculated. The initial reaction results and the results after 72 hours of continuous operation are shown in Table 1 below.

[0058] Table 1

[0059] The experimental data above demonstrate that the catalyst and its preparation method provided by this invention can achieve high conversion and high yield in the decarbonylation of dimethyl oxalate to dimethyl carbonate, and the catalyst exhibits good stability. In particular, a comparison of the data results from Example 1 and Comparative Example 1 proves the crucial role of the high-temperature pretreatment step of the support in improving the catalyst activity and stability.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A catalyst for the decarbonylation of dimethyl oxalate, characterized in that, Includes a carrier; and an active component loaded on the carrier; The active component is one or more of Co, Ni and Pd; the loading of the active component is 0.1% to 5%.

2. The dimethyl oxalate decarbonylation catalyst according to claim 1, characterized in that, The carrier is one or more of activated carbon, silica gel, and molecular sieve.

3. The dimethyl oxalate decarbonylation catalyst according to claim 1 or 2, characterized in that, The carrier is activated carbon, and the active component is Ni.

4. The dimethyl oxalate decarbonylation catalyst according to claim 1, characterized in that, The particle size of the active component is 3~5 nm.

5. A method for preparing the dimethyl oxalate decarbonylation catalyst according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. The carrier is soaked in an acidic solution, washed until neutral, and then treated at a high temperature of 600~900℃ under a nitrogen atmosphere to obtain the pretreated carrier; S2. The pretreated carrier is immersed in a transition metal salt solution. After immersion, the first precursor load is obtained. S3. The first precursor load is slowly dried at 60~90℃, and then the temperature is raised to 180~220℃ to continue drying to obtain the second precursor load; S4. Under nitrogen protection, the second precursor support was calcined at high temperature to obtain the dimethyl oxalate decarbonylation catalyst; The transition metal salt solution is one or more of nickel nitrate solution, palladium chloride solution, and cobalt nitrate solution.

6. The method for preparing the dimethyl oxalate decarbonylation catalyst according to claim 5, characterized in that, In step S1, the high-temperature treatment time is 3 hours; in step S4, when the support is silica gel or molecular sieve, after the second precursor support is calcined at high temperature, 5% H2 is introduced to carry out a reduction reaction. After the reaction is completed, the dimethyl oxalate decarbonylation catalyst is obtained.

7. The method for preparing the dimethyl oxalate decarbonylation catalyst according to claim 5, characterized in that, In step S2, the mass ratio of the carrier to the transition metal salt solution is 1:(0.2~0.4), and the concentration of the transition metal salt solution is 0.024~4.26 mol / L.

8. The method for preparing the dimethyl oxalate decarbonylation catalyst according to claim 5, characterized in that, In step S4, the high-temperature roasting temperature is 300~600℃ and the time is 2~5h.

9. The application of a dimethyl oxalate decarbonylation catalyst prepared by the method according to any one of claims 5 to 8, characterized in that, It is used to catalyze the decarbonylation of dimethyl oxalate to prepare dimethyl carbonate.

10. The application according to claim 9, characterized in that, The catalytic process involves the decarbonylation of dimethyl oxalate in a fixed-bed reactor using a catalyst, with a liquid hourly space velocity (LHSV) of 0.5 h⁻¹. -1 .

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