A vinyl acetate catalyst and its preparation method and application

Abstract

The present invention discloses a vinyl acetate catalyst, its preparation method, and application. The method comprises the following steps: crushing a carbonized raw material, adding an acidic solution, soaking for a period of time, washing and drying, then adding an alkaline solution and stirring, isolating the mixture from air to obtain a base carbon material; mixing the base carbon material with a Y-type molecular sieve, then calcining the mixture in stages, and then introducing an appropriate amount of a mixed gas of water vapor, carbon dioxide, and nitrogen to obtain a composite catalyst carrier; mixing the composite catalyst carrier with sodium hydroxypropanesulfonic acid methacrylate, adding deionized water, and stirring to obtain a carrier suspension; simultaneously adding a palladium chloride solution and a tungsten chloride solution dropwise to the carrier suspension, stirring, centrifuging, drying, grinding, and calcining to obtain a modified catalyst carrier; and mixing the modified catalyst carrier with zinc acetate and an additive, stirring, insulating, filtering, and drying to obtain a vinyl acetate catalyst. The vinyl acetate catalyst provided by the present invention has a good conversion rate.

Description

Technical Field

[0001] The present invention relates to the technical field of catalysts, and in particular to a vinyl acetate catalyst, a preparation method and an application thereof. Background Art

[0002] Vinyl acetate (VAC) is an important chemical raw material widely used in the production of polymers, coatings, and adhesives. The fixed-bed vapor-phase synthesis of VAC via the acetylene process is currently one of the main industrial synthetic pathways. This process uses acetylene and acetic acid as raw materials over a zinc acetate-loaded activated carbon catalyst (Zn(AC)2). This exothermic reaction is accompanied by the occurrence of numerous side reactions, leading to the formation of various byproducts such as benzene derivatives, acetaldehyde, and crotonaldehyde, which affect the yield and purity of VAC.

[0003] Catalyst selection is crucial in the synthesis of vinyl acetate. High-quality catalysts not only improve reaction selectivity and conversion, but also significantly extend catalyst life and reduce reactor operating costs. Fixed-bed catalysts often face challenges during operation, such as reduced activity, low VAC yield, and high byproduct production. Research has shown that the specific surface area, pore structure, and distribution characteristics of the support significantly influence catalyst activity and stability.

[0004] Chinese invention patent publication number CN103934030A relates to a method for producing a catalyst for synthesizing vinyl acetate via the acetylene process. The method utilizes a catalyst for synthesizing vinyl acetate, comprising a support and an active component supported on the support. The active components are zinc acetate and bismuth subcarbonate. The zinc acetate content in the catalyst is 90-180 g / L, and the bismuth subcarbonate content is 0.1-0.3 g / L. The catalyst support is a porous carbon material, wherein pores with pore diameters of 3-10 nm account for 20%-80% of the total pore volume, and pores with pore diameters of 30-40 nm account for 10%-60% of the total pore volume. This method uses conventional activated carbon as a support and operates at atmospheric pressure, which does not allow for carrier expansion. The zinc acetate content is low, and the auxiliary agent is solely bismuth subcarbonate, resulting in an insufficiently rich pore structure and a small reaction space. This results in low catalytic conversion efficiency and mediocre performance for the synthesis reaction. Therefore, developing new catalysts to improve reaction efficiency and economic benefits has become a research priority. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a vinyl acetate catalyst and its preparation method and application, so as to solve the technical problems that the existing catalysts are easy to lose activity, have low VAC yield, and produce many by-products.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a method for preparing a vinyl acetate catalyst, comprising the following steps:

[0008] S1. Crush the carbonized raw material to obtain carbonized particles, add an acidic solution, soak for a period of time, wash, dry, then add an alkaline solution, stir, isolate from air, and obtain a base carbon material;

[0009] S2, mixing the carbon-based material and the Y-type molecular sieve, and then calcining them in stages, and then introducing a mixed gas of water vapor, carbon dioxide and nitrogen to obtain a composite catalytic carrier;

[0010] S3, mixing the composite catalyst support and sodium hydroxypropanesulfonate methacrylate, adding deionized water, and stirring to obtain a support suspension;

[0011] S4, adding palladium chloride solution and tungsten chloride solution to the support suspension simultaneously, stirring, centrifuging, drying, grinding, and calcining to obtain a modified catalyst support;

[0012] S5. Mixing the modified catalyst support, zinc acetate and an auxiliary agent, stirring, heat-insulating, filtering and drying to obtain a vinyl acetate catalyst.

[0013] Preferably, in step S1, the carbonized raw material includes any one of coconut shell carbonized material powder, sawdust, coal powder, petroleum coke, apricot shell, and bamboo processing debris.

[0014] Preferably, in step S1, the acidic solution includes at least one of acetic acid, dilute hydrochloric acid, and nitric acid, and the mass fraction of the acidic solution is 1% to 5%;

[0015] The immersion time is 100 to 150 minutes;

[0016] The alkaline solution includes at least one of sodium hydroxide, potassium hydroxide, and barium hydroxide, and the mass fraction of the alkaline solution is 2% to 6%;

[0017] The air isolation treatment is carried out in an anti-corrosion pressure vessel, the time of the air isolation treatment is 100 to 150 minutes, and the temperature of the air isolation treatment is 300 to 500°C.

[0018] Preferably, in step S2, the mass ratio of the base carbon material to the Y-type molecular sieve is (8-10):(2-3).

[0019] Preferably, in step S2, the specific steps of the staged calcination are: calcining at 800-1000°C for 0.5-1.5h, then heating to 1000-1100°C for 1.5-2.5h;

[0020] The flow rate of the mixed gas is 5 to 20 m3 / min.

[0021] Preferably, in step S3, the usage ratio of the composite catalyst support, sodium hydroxypropanesulfonate methacrylate and deionized water is (5-8 g): (2-5 g): (10-20 mL).

[0022] Preferably, in step S4, the concentration of the palladium chloride solution is 0.1-0.2 mol / L, the concentration of the tungsten chloride solution is 0.1-0.2 mol / L, and the volume ratio of the carrier suspension, the palladium chloride solution and the tungsten chloride solution is (6-10): (2-3): (2-3);

[0023] The stirring time is 2 to 4 hours;

[0024] The calcination temperature is 500-550°C.

[0025] Preferably, in step S5, the mass fraction of zinc acetate is 6 to 12%;

[0026] The auxiliary agent includes any one of ammonium paramolybdate solution, lanthanum acetate solution, and acidic barium solution;

[0027] The drying temperature is 170-240°C.

[0028] The present invention also provides a vinyl acetate catalyst, which is prepared by the above-mentioned preparation method.

[0029] The present invention further proposes an application of the above vinyl acetate catalyst in the acetylene process fixed-bed gas-phase synthesis of vinyl acetate.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The present invention provides a method for preparing a vinyl acetate catalyst. The method comprises the following steps: adding an acidic solution to a carbon-containing material such as anthracite, sawdust, and coconut shell for impregnation treatment, thereby improving the pyrolysis and gasification capabilities of the material. The material is then subjected to an alkalization treatment to obtain a base carbon material. The base carbon material is then mixed with a Y-type molecular sieve, calcined and activated in stages, and then mixed with a surfactant, sodium methacrylate hydroxypropanesulfonate. The catalyst is then loaded with palladium and tungsten, thereby improving the conversion rate and selectivity of the catalyst.

[0032] (2) The method for preparing vinyl acetate catalyst provided by the present invention is to mix the base carbon material with the Y-type molecular sieve and perform staged calcination, combining the high specific area characteristics of the carbon material with the molecular screening ability of the molecular sieve to form a composite catalytic carrier. By mixing with the dispersant sodium methacrylate hydroxypropyl sulfonate, it not only helps to uniformly distribute the loaded components, but also plays a bonding role, so that the loaded components are more firmly loaded on the carrier, and the carrier is doped with sulfur to improve the catalytic activity and stability of the catalyst. By loading the active component palladium and the auxiliary component tungsten to prepare a modified catalyst carrier, the catalytic activity, thermal stability, durability and anti-poisoning ability of the catalyst carrier are synergistically improved, which can effectively promote the synthesis reaction of vinyl acetate. This bimetallic loading method not only improves the activity of the catalyst, but also improves its stability under high temperature and complex reaction conditions. This composite structure can effectively improve the selectivity and stability of the catalyst, ensuring good catalytic activity in the vinyl acetate synthesis process.

[0033] (3) The vinyl acetate catalyst provided by the present invention has a VAC yield of up to 120 g / ml·h, which is much higher than that of traditional catalysts, indicating that this method has significant advantages in improving the efficiency of vinyl acetate synthesis. The concentrations of acetaldehyde and crotonaldehyde in the by-products are less than 0.2% and 0.003%, respectively, ensuring the purity of the product and meeting the requirements of high-end applications. Its high strength and low average resistance (40 kPa) enable the output of a single-row reactor to reach 145 t / d, further demonstrating the superiority of this catalyst in industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a process flow chart of the method for preparing vinyl acetate catalyst provided by the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0036] It should be noted that, unless otherwise specified, all chemical reagents involved in the present invention were purchased through commercial channels.

[0037] In the present invention, the SiO2 / Al2O3 ratio in the Y-type molecular sieve is 5.0.

[0038] Example 1

[0039] A method for preparing a vinyl acetate catalyst comprises the following steps:

[0040] (1) 150 g of anthracite was crushed to obtain carbonized particles, added with a 3% by mass acetic acid solution, immersed for a period of time, washed and dried, and then added with a 3% by mass sodium hydroxide solution with stirring, and treated at 400° C. in an airtight state for 120 min to obtain a base carbon material;

[0041] (2) 100 g of the carbon material and 25 g of Y-type molecular sieve were mixed, and then calcined at 900 ° C for 1 h, and then heated to 1050 ° C for 2 h, and then a mixed gas of water vapor, carbon dioxide and nitrogen with a volume ratio of 1:1:1 was introduced to obtain a composite catalytic support;

[0042] (3) 120 g of the composite catalyst support and 60 g of sodium hydroxypropanesulfonate methacrylate were mixed, 300 mL of deionized water was added, and the mixture was stirred to obtain a support suspension;

[0043] (4) 80 mL of 0.15 mol / L palladium chloride solution and 80 mL of 0.12 mol / L tungsten chloride solution were added dropwise to 300 mL of the support suspension, stirred for 3 h, centrifuged, dried, ground, and calcined at 520° C. to obtain a modified catalyst support;

[0044] (5) 120 g of the modified catalyst support was mixed with 50 mL of 6% by mass zinc acetate and 30 mL of 4% by mass ammonium paramolybdate, stirred, kept at 40° C. for 4 h, filtered, and dried at 170° C. under nitrogen gas protection to obtain a vinyl acetate catalyst.

[0045] Example 2

[0046] A method for preparing a vinyl acetate catalyst comprises the following steps:

[0047] (1) 150 g of coconut shell carbonized material was crushed to obtain carbonized particles, added with a 3% by mass dilute hydrochloric acid solution, immersed for a period of time, washed and dried, and then added with a 3% by mass potassium hydroxide solution with stirring, and treated at 400° C. in an airtight state for 120 min to obtain a base carbon material;

[0048] (2) 100 g of the carbon-based material and 20 g of Y-type molecular sieve were mixed, and then calcined at 800 ° C for 1 h, and then heated to 1000 ° C for 2 h, and then a mixed gas of water vapor, carbon dioxide and nitrogen with a volume ratio of 1:1:1 was introduced to obtain a composite catalytic support;

[0049] (3) 120 g of the composite catalyst support and 60 g of sodium hydroxypropanesulfonate methacrylate were mixed, 300 mL of deionized water was added, and the mixture was stirred to obtain a support suspension;

[0050] (4) 80 mL of 0.15 mol / L palladium chloride solution and 80 mL of 0.12 mol / L tungsten chloride solution were added dropwise to 300 mL of the support suspension, stirred for 3 h, centrifuged, dried, ground, and calcined at 500° C. to obtain a modified catalyst support;

[0051] (5) 120 g of the modified catalyst support was mixed with 50 mL of 6% by mass zinc acetate and 30 mL of 4% by mass ammonium paramolybdate, stirred, kept warm at 40° C. for 4 h, filtered, and dried at 200° C. under nitrogen gas protection to obtain a vinyl acetate catalyst.

[0052] Example 3

[0053] A method for preparing a vinyl acetate catalyst comprises the following steps:

[0054] (1) 150 g of coconut shell carbonized material was crushed to obtain carbonized particles, added with a 3% by mass nitric acid solution, immersed for a period of time, washed and dried, and then added with a 3% by mass barium hydroxide solution with stirring, and treated at 400° C. in an airtight state for 120 min to obtain a base carbon material;

[0055] (2) 100 g of the carbon-based material and 30 g of Y-type molecular sieve were mixed, and then calcined at 1000 ° C for 1 h, and then heated to 1100 ° C for 2 h, and then a mixed gas of water vapor, carbon dioxide and nitrogen with a volume ratio of 1:1:1 was introduced to obtain a composite catalytic support;

[0056] (3) 120 g of the composite catalyst support and 60 g of sodium hydroxypropanesulfonate methacrylate were mixed, 300 mL of deionized water was added, and the mixture was stirred to obtain a support suspension;

[0057] (4) 80 mL of 0.15 mol / L palladium chloride solution and 80 mL of 0.12 mol / L tungsten chloride solution were added dropwise to 300 mL of the support suspension, stirred for 3 h, centrifuged, dried, ground, and calcined at 550° C. to obtain a modified catalyst support;

[0058] (5) 120 g of the modified catalyst support was mixed with 50 mL of 6% by mass zinc acetate and 30 mL of 4% by mass ammonium paramolybdate, stirred, kept at 40° C. for 4 h, filtered, and dried at 240° C. under nitrogen gas protection to obtain a vinyl acetate catalyst.

[0059] Comparative Example 1

[0060] A method for preparing a vinyl acetate catalyst comprises the following steps:

[0061] (1) 150 g of anthracite was crushed to obtain carbonized particles, added with a 3% by mass acetic acid solution, immersed for a period of time, washed and dried, and then added with a 3% by mass sodium hydroxide solution with stirring, and treated at 400° C. in an airtight state for 120 min to obtain a base carbon material;

[0062] (2) 100 g of the carbon material and 25 g of Y-type molecular sieve were mixed, and then calcined at 900 ° C for 1 h, and then heated to 1050 ° C for 2 h, and then a mixed gas of water vapor, carbon dioxide and nitrogen with a volume ratio of 1:1:1 was introduced to obtain a composite catalytic support;

[0063] (3) 120 g of the composite catalyst support was mixed with 300 mL of deionized water and stirred to obtain a support suspension;

[0064] (4) 80 mL of 0.15 mol / L palladium chloride solution and 80 mL of 0.12 mol / L tungsten chloride solution were added dropwise to 300 mL of the support suspension, stirred for 3 h, centrifuged, dried, ground, and calcined at 520° C. to obtain a modified catalyst support;

[0065] (5) 120 g of the modified catalyst support was mixed with 50 mL of 6% by mass zinc acetate and 30 mL of 4% by mass ammonium paramolybdate, stirred, kept at 40° C. for 4 h, filtered, and dried at 170° C. under nitrogen gas protection to obtain a vinyl acetate catalyst.

[0066] Compared with Example 1 and Comparative Example 1, the composite catalyst support is not mixed with the surfactant in step (3).

[0067] Comparative Example 2

[0068] A method for preparing a vinyl acetate catalyst comprises the following steps:

[0069] (1) 150 g of anthracite was crushed to obtain carbonized particles, added with a 3% by mass acetic acid solution, immersed for a period of time, washed and dried, and then added with a 3% by mass sodium hydroxide solution with stirring, and treated at 400° C. in an airtight state for 120 min to obtain a base carbon material;

[0070] (2) 100 g of the carbon material and 25 g of Y-type molecular sieve were mixed, and then calcined at 900 ° C for 1 h, and then heated to 1050 ° C for 2 h, and then a mixed gas of water vapor, carbon dioxide and nitrogen with a volume ratio of 1:1:1 was introduced to obtain a composite catalytic support;

[0071] (3) 120 g of the composite catalyst support and 60 g of sodium hydroxypropanesulfonate methacrylate were mixed, 300 mL of deionized water was added, and the mixture was stirred to obtain a support suspension;

[0072] (4) 80 mL of 0.12 mol / L tungsten chloride solution was added dropwise to 300 mL of the support suspension, stirred for 3 h, centrifuged, dried, ground, and calcined at 520° C. to obtain a modified catalyst support;

[0073] (5) 120 g of the modified catalyst support was mixed with 50 mL of 6% by mass zinc acetate and 30 mL of 4% by mass ammonium paramolybdate, stirred, kept at 40° C. for 4 h, filtered, and dried at 170° C. under nitrogen gas protection to obtain a vinyl acetate catalyst.

[0074] Compared with Example 1, in Comparative Example 2, no palladium chloride solution was added to the carrier suspension in step (4).

[0075] Comparative Example 3

[0076] A method for preparing a vinyl acetate catalyst comprises the following steps:

[0077] (1) 150 g of anthracite was crushed to obtain carbonized particles, added with a 3% by mass acetic acid solution, immersed for a period of time, washed and dried, and then added with a 3% by mass sodium hydroxide solution with stirring, and treated at 400° C. in an airtight state for 120 min to obtain a base carbon material;

[0078] (2) 100 g of the carbon material and 25 g of Y-type molecular sieve were mixed, and then calcined at 900 ° C for 1 h, and then heated to 1050 ° C for 2 h, and then a mixed gas of water vapor, carbon dioxide and nitrogen with a volume ratio of 1:1:1 was introduced to obtain a composite catalytic support;

[0079] (3) 120 g of the composite catalyst support and 60 g of sodium hydroxypropanesulfonate methacrylate were mixed, 300 mL of deionized water was added, and the mixture was stirred to obtain a support suspension;

[0080] (4) 80 mL of 0.15 mol / L palladium chloride solution was added dropwise to 300 mL of the support suspension, stirred for 3 h, centrifuged, dried, ground, and calcined at 520° C. to obtain a modified catalyst support;

[0081] (5) 120 g of the modified catalyst support was mixed with 50 mL of 6% by mass zinc acetate and 30 mL of 4% by mass ammonium paramolybdate, stirred, kept at 40° C. for 4 h, filtered, and dried at 170° C. under nitrogen gas protection to obtain a vinyl acetate catalyst.

[0082] Compared with Example 1, in Comparative Example 3, no tungsten chloride solution was added to the carrier suspension in step (4).

[0083] Comparative Example 4

[0084] A method for preparing a vinyl acetate catalyst comprises the following steps:

[0085] (1) 150 g of anthracite was crushed to obtain carbonized particles, added with a 3% by mass acetic acid solution, immersed for a period of time, washed and dried, and then added with a 3% by mass sodium hydroxide solution with stirring, and treated at 400° C. in an airtight state for 120 min to obtain a base carbon material;

[0086] (2) 100 g of the carbon material and 25 g of Y-type molecular sieve were mixed, and then calcined at 900 ° C for 1 h, and then heated to 1050 ° C for 2 h, and then a mixed gas of water vapor, carbon dioxide and nitrogen with a volume ratio of 1:1:1 was introduced to obtain a composite catalytic support;

[0087] (3) 120 g of the composite catalyst support and 60 g of sodium hydroxypropanesulfonate methacrylate were mixed, 300 mL of deionized water was added, and the mixture was stirred to obtain a support suspension;

[0088] (4) 300 mL of the support suspension was centrifuged, dried, ground, and then calcined at 520° C. to obtain a catalyst support;

[0089] (5) 120 g of the catalyst carrier was mixed with 50 mL of 6% by mass zinc acetate and 30 mL of 4% by mass ammonium paramolybdate, stirred, kept at 40° C. for 4 h, filtered, and dried at 170° C. under nitrogen gas protection to obtain a vinyl acetate catalyst.

[0090] Compared with Example 1, in Comparative Example 3, no palladium chloride solution and tungsten chloride solution were added to the carrier suspension in step (4).

[0091] Vinyl acetate was synthesized in a fixed-bed gas phase using the acetylene method. The specific conditions were: catalyst loading volume: 40 ml; reaction raw material composition (in molar ratio): acetylene: acetic acid = 6:1; reaction raw material volume space velocity: 300 h -1 ; Reaction pressure: 0.3atm; Reaction temperature: 180℃; Reaction time: 100h; After 100h of reaction, the content of each component in the reaction product was analyzed by gas chromatography, and the space-time yield of the catalyst was calculated. The results are shown in Table 1 below.

[0092] Table 1 Summary of experimental results of Examples 1 to 3 and Comparative Examples 1 to 3

[0093]

[0094]

[0095] As can be seen from the above table, compared with Comparative Examples 1 to 3, the vinyl acetate catalyst prepared by the present invention has a better space-time yield, less catalytic by-product content, higher purity and higher selectivity.

[0096] Finally, it should be noted that the above embodiments do not limit the present invention in any form. Those skilled in the art will appreciate that modifications and improvements can be made based on the present invention. Therefore, any modifications or improvements made without departing from the spirit of the present invention are intended to fall within the scope of protection claimed in the present invention.

Claims

1. A method for preparing a catalyst for synthesizing vinyl acetate, characterized in that: The following steps are involved: S1. Crush the carbonized raw material to obtain carbonized particles, add an acidic solution, soak for a period of time, wash, dry, then add an alkaline solution, stir, isolate from air, and obtain a base carbon material; S2, mixing the carbon-based material and the Y-type molecular sieve, and then calcining them in stages, and then introducing a mixed gas of water vapor, carbon dioxide and nitrogen to obtain a composite catalytic carrier; S3, mixing the composite catalyst support and sodium hydroxypropanesulfonate, adding deionized water, and stirring to obtain a support suspension; S4, adding palladium chloride solution and tungsten chloride solution to the support suspension simultaneously, stirring, centrifuging, drying, grinding, and calcining to obtain a modified catalyst support; S5, mixing the modified catalyst support with zinc acetate and an additive, stirring, keeping warm, filtering, and drying to obtain a vinyl acetate catalyst; The auxiliary agent is ammonium paramolybdate solution.

2. The method for preparing a catalyst for synthesizing vinyl acetate according to claim 1, wherein: In step S1, the carbonized raw material includes any one of coconut shell carbonized material powder, sawdust, coal powder, petroleum coke, apricot shell, and bamboo processing debris.

3. The method for preparing a catalyst for synthesizing vinyl acetate according to claim 1, wherein: In step S1, the acidic solution includes at least one of acetic acid, dilute hydrochloric acid, and nitric acid, and the mass fraction of the acidic solution is 1% to 5%; The immersion time is 100 to 150 minutes; The alkaline solution includes at least one of sodium hydroxide, potassium hydroxide, and barium hydroxide, and the mass fraction of the alkaline solution is 2% to 6%; The air isolation treatment is carried out in an anti-corrosion pressure vessel, the time of the air isolation treatment is 100 to 150 minutes, and the temperature of the air isolation treatment is 300 to 500°C.

4. The method for preparing a catalyst for synthesizing vinyl acetate according to claim 1, wherein: In step S2, the mass ratio of the base carbon material to the Y-type molecular sieve is (8-10): (2-3).

5. The method for preparing a catalyst for synthesizing vinyl acetate according to claim 1, wherein: In step S2, the specific steps of the staged calcination are: calcining at 800-1000°C for 0.5-1.5h, then heating to 1000-1100°C for 1.5-2.5h; The flow rate of the mixed gas is 5 to 20 m 3 / min.

6. The method for preparing a catalyst for synthesizing vinyl acetate according to claim 1, wherein: In step S3, the usage ratio of the composite catalyst carrier, sodium hydroxypropanesulfonate methacrylate and deionized water is (5-8 g): (2-5 g): (10-20 mL).

7. The method for preparing a catalyst for synthesizing vinyl acetate according to claim 1, wherein: In step S4, the concentration of the palladium chloride solution is 0.1-0.2 mol / L, the concentration of the tungsten chloride solution is 0.1-0.2 mol / L, and the volume ratio of the carrier suspension, the palladium chloride solution and the tungsten chloride solution is (6-10): (2-3): (2-3); The stirring time is 2 to 4 hours; The calcination temperature is 500-550°C.

8. The method for preparing a catalyst for synthesizing vinyl acetate according to claim 1, wherein: In step S5, the mass fraction of zinc acetate in the solution is 6 to 12%; The drying temperature is 170-240°C.

9. A vinyl acetate catalyst, characterized in that: The product is prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the vinyl acetate catalyst according to claim 9, characterized in that: It is used in the fixed-bed gas-phase synthesis of vinyl acetate by the acetylene process.

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