Ion-doped catalyst for synthesizing hexafluoro-1, 3-butadiene as well as preparation method and application of ion-doped catalyst

Abstract

The invention relates to the technical field of synthesis of hexafluoro-1, 3-butadiene, in particular to an ion-doped catalyst for synthesis of hexafluoro-1, 3-butadiene as well as a preparation method and application of the ion-doped catalyst. The preparation method comprises the following steps: carrying out mechanical ball milling treatment on a first metal sulfate and a second metal fluoride or a second metal oxide, and then transferring into a hydrothermal kettle for hydrothermal treatment to realize ion doping; after the hydrothermal treatment is finished, washing and drying a product, and finally putting the product into a muffle furnace for roasting treatment to obtain the ion-doped catalyst. The preparation method provided by the invention is simple and good in repeatability, and raw materials are cheap and easy to obtain; the prepared ion-doped catalyst has the advantages of large number of active sites and high catalytic activity.

Description

Technical Field

[0001] The invention relates to the technical field of hexafluoro-1,3-butadiene synthesis, and in particular to an ion-doped catalyst for hexafluoro-1,3-butadiene synthesis, and a preparation method and application thereof. Background Art

[0002] Perfluorobutadiene, also known as hexafluoro-1,3-butadiene, is a perfluorinated compound containing two double bonds. It is a colorless and odorless liquefied gas with a density of 1.553 g / cm 3 , boiling point is 6 ℃, melting point is -132 ℃, molecular weight is 162. Perfluorobutadiene is a new type of dry etching gas with excellent etching performance. It is used to etch and produce rectifier circuit boards containing Cu and low dielectric constant. Perfluorobutadiene is mainly used for precision etching of key dimensions, with better selectivity and aspect ratio than other etching gases. At the same time, hexafluorobutadiene has excellent environmental performance. Its short existence time in the atmosphere (1.9d) and GWP are (100) =290 and ODP (ozone depletion potential) is zero, with extremely low greenhouse effect and green environmental protection. The GWP (global warming potential) of hexafluorobutadiene emitted during the etching process is reduced by 80% and 82% respectively, making it the best substitute for saturated fluorocarbon etching gas in terms of performance and environmental protection requirements. Therefore, it has high market potential and is an important product in the future high-end etching gas market.

[0003] At present, the main method for preparing hexafluoro-1,3-butadiene is the trifluorovinyl zinc bromide method, in which the trifluorovinyl zinc bromide reagent is reacted in a non-protonic polar solvent containing a copper or iron ion catalyst to generate hexafluorobutadiene through coupling polymerization. The reaction conditions are mild and are usually coupled with the process of preparing an organic zinc reagent, saving physical treatment steps such as intermediate product purification. The preparation of organic zinc reagents is mainly obtained by zincation of trifluorobromoethylene or 1,1-dibromotetrafluoroethane, and the reaction is usually carried out in an environment of zinc powder, organic solvent, and a catalyst or initiator. Among them, 1,1-dibromotetrafluoroethane can be prepared from tetrafluoroethylene by bromine addition and isomerization, and can also be prepared from 1,1,1,2-tetrafluoroethane by bromine substitution reaction, but the selectivity of the reaction product is low. The invention patent with application number 202310905061.1 discloses a method for reacting trifluorovinyl phenyl ether with hydrogen halide to generate halogenated trifluoroethylene, and then zincating and coupling it to prepare hexafluorobutadiene. This method involves trifluorovinyl zinc bromide, trifluorovinyl zinc chloride and trifluorovinyl zinc iodide, and the raw material cost is relatively high.

[0004] Another method for preparing hexafluoro-1,3-butadiene is to prepare hexafluoro-1,3-butadiene by hydrogenation dechlorination coupling using chlorotrifluoroethylene as a raw material. The Chinese invention patent with application number 202310702745.1 discloses a preparation process for converting chlorotrifluoroethylene into hexafluorobutadiene in one step by sodium dechlorination coupling. The specific operation steps of the preparation process are: first, remove the moisture and oxygen in the device by vacuum-nitrogen replacement operation, then add sodium wire and toluene solvent treated with anhydrous and oxygen-free treatment, heat to 80~120 ℃, stir until the sodium wire is completely converted into sodium sand, then pass ammonia to activate metallic sodium, and finally pass chlorotrifluoroethylene. After reacting at 80~120 ℃ for 1~4 hours, the hexafluorobutadiene gas product can be obtained, and the hexafluorobutadiene yield can reach 88.6% and the purity is 96.2%. This synthesis method has the advantages of short process route, controllable reaction conditions, high product yield and low output of three wastes. However, in addition to the reaction raw material chlorotrifluoroethylene, the entire process also requires auxiliary raw materials such as sodium wire (dechlorinating agent), toluene (solvent), ammonia (activator) and desiccant (phosphorus pentoxide or calcium oxide, etc.), anhydrous ethanol, benzophenone and magnesium sulfate. The reaction requires metallic sodium wire and an anhydrous and oxygen-free operating environment. The flammable properties of sodium wire and the maintenance of an anhydrous and oxygen-free operating environment bring difficulties to its industrial scale-up.

[0005] In summary, current research mainly focuses on the synthesis of hexafluoro-1,3-butadiene by synthesizing trifluorovinyl zinc reagents and by solvent dechlorination. However, the existing processes have the disadvantages of complicated routes, high operating conditions and difficult to obtain raw materials. Therefore, the development of new hexafluoro-1,3-butadiene synthesis processes is a key issue that needs to be solved urgently. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, which has a simple route, low operating conditions and easily available raw materials, and a preparation method and application thereof.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: mechanically ball-milling a first metal sulfate and a second metal fluoride or a second metal oxide, and then transferring them to a hydrothermal kettle for hydrothermal treatment to achieve ion doping; after the hydrothermal treatment, washing and drying the product, and finally placing it in a muffle furnace for calcination to obtain the ion-doped catalyst.

[0008] Another technical solution adopted by the present invention is: the ion-doped catalyst is prepared by adopting the preparation method of the ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene.

[0009] Another technical solution adopted by the present invention is: the above-mentioned ion-doped catalyst is used in the reaction of co-cracking and dehydrohalogenating 1,1,2,3,3-pentafluoropropylene (CF2=CFCHF2) and difluoromonochloromethane (CHClF2) to generate hexafluoro-1,3-butadiene in one step.

[0010] The beneficial effects of the present invention are as follows: the present invention provides an ion-doped catalyst with a large number of active sites and high catalytic activity for the one-step generation of hexafluoro-1,3-butadiene by co-cracking 1,1,2,3,3-pentafluoropropylene and difluoromonochloromethane to dehydrohalogenate. The ion-doped catalyst is obtained by sequentially performing ball milling, hydrothermal treatment and calcination, and the preparation method is simple, the repeatability is good, and the raw materials are cheap and readily available. DETAILED DESCRIPTION

[0011] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes.

[0012] A method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene comprises the following steps: subjecting a first metal sulfate and a second metal fluoride or a second metal oxide to mechanical ball milling treatment, and then transferring them to a hydrothermal kettle for hydrothermal treatment to achieve ion doping; after the hydrothermal treatment, washing and drying the product, and finally placing it in a muffle furnace for calcination treatment to obtain the ion-doped catalyst.

[0013] From the above description, it can be seen that the beneficial effect of the present invention is that the present invention performs preliminary ion doping of the first metal sulfate and the second metal oxide or fluoride by ball milling, and then obtains a lattice-doped ion-doped catalyst by hydrothermal and calcination treatment, thereby increasing the number of catalyst active sites and thus improving the catalytic activity. The preparation method is simple and has good repeatability. The first metal sulfate and the second metal oxide or fluoride used in the preparation process are cheap and easy to obtain, and have excellent industrial application prospects.

[0014] Furthermore, the first metal sulfate is any one of BaSO4, SrSO4, CaSO4, NiSO4·6H2O, ZnSO4·H2O and Bi2(SO4)3; the second metal fluoride is AlF3 or MgF2; the second metal oxide is any one of Cr2O3, Al2O3, MgO, V2O5, Co3O4 and ZrO2.

[0015] Preferably, the first metal sulfate is any one of BaSO4, SrSO4 and ZnSO4·H2O; the second metal fluoride is MgF2; and the second metal oxide is any one of Cr2O3, Al2O3 and V2O5.

[0016] Furthermore, the molar ratio of the first metal sulfate to the second metal fluoride is 10:1-1:10, and the molar ratio of the first metal sulfate to the second metal oxide is 10:1-1:10.

[0017] Preferably, the molar ratio of the first metal sulfate to the second metal fluoride is 5:1 to 1:3, and the molar ratio of the first metal sulfate to the second metal oxide is 5:1 to 1:3.

[0018] Furthermore, the mechanical ball milling treatment time is 1-12 h, the rotation speed is 100-500 r / min, and the mass ratio of grinding balls to raw materials is 10:1.

[0019] Preferably, the mechanical ball milling treatment time is 3 to 8 h, and the rotation speed is 250 to 400 r / min.

[0020] Furthermore, the hydrothermal treatment time is 3~24 h and the temperature is 100~250 ℃.

[0021] Preferably, the hydrothermal treatment time is 6-16 h and the temperature is 120-200 °C.

[0022] Furthermore, a solvent is added during the hydrothermal treatment, and the solvent is a hydrofluoric acid solution with a concentration of 3-20 mol / L.

[0023] Preferably, the solvent is a hydrofluoric acid solution with a concentration of 7 to 13 mol / L.

[0024] Furthermore, washing and drying are specifically as follows: washing and filtering three times with water, and then placing in a forced air drying oven and drying at 120° C. for 12 h.

[0025] Furthermore, the calcination temperature is 400-900 °C and the calcination time is 2-12 h.

[0026] Preferably, the calcination temperature is 500-700°C and the calcination time is 4-8 hours.

[0027] Another technical solution adopted by the present invention is: the ion-doped catalyst is prepared by adopting the preparation method of the ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene.

[0028] Another technical solution adopted by the present invention is: the above-mentioned ion-doped catalyst is used in the reaction of co-cracking and dehydrohalogenating 1,1,2,3,3-pentafluoropropylene and difluoromonochloromethane to generate hexafluoro-1,3-butadiene in one step.

[0029] Embodiment 1 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: 116.7 g of BaSO4 and 15.2 g of Cr2O3 were weighed, and then placed in a ball mill according to the mass ratio of grinding balls to raw materials of 10:1, and the ball milling speed was 250 r / min, and the ball milling treatment was 3 h. Then, the material obtained by ball milling was placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution was 7 mol / L, the hydrothermal temperature was 120 ℃, and the hydrothermal time was 6 h. After the hydrothermal treatment was completed, the obtained product was washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. Then, the obtained product was placed in a muffle furnace and calcined at 500 ℃ for 4 h, and finally a BaCr ion-doped catalyst was obtained, which was recorded as S-1.

[0030] Embodiment 2 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: Weigh 68 g of CaSO4 and 4.2 g of AlF3, then place them in a ball mill and add grinding balls according to the mass ratio of grinding balls to raw materials of 10:1, the ball mill speed is 100 r / min, and the ball milling treatment is 1 h. Then the ball milled material is placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution is 3 mol / L, the hydrothermal temperature is 100 ℃, and the hydrothermal time is 3 h. After the hydrothermal treatment is completed, the obtained product is washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. Then the obtained product is placed in a muffle furnace and calcined at 400 ℃ for 2 h, and finally a CaAl ion-doped catalyst is obtained, which is recorded as S-2.

[0031] Embodiment 3 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: 13.1 g of NiSO4·6H2O and 120 g of Co3O4 were weighed and then placed in a ball mill according to the mass ratio of grinding balls to raw materials of 10:1. The ball milling speed was 500 r / min and the ball milling treatment was 12 h. The material obtained by ball milling was then placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution was 20 mol / L, the hydrothermal temperature was 250 ℃, and the hydrothermal time was 24 h. After the hydrothermal treatment was completed, the obtained product was washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. The obtained product was then placed in a muffle furnace and calcined at 900 ℃ for 12 h to finally obtain a NiCo ion-doped catalyst, which was recorded as S-3.

[0032] Embodiment 4 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: 141.2 g of Bi2(SO4)3 and 7.3 g of V2O5 were weighed and then placed in a ball mill according to the mass ratio of grinding balls to raw materials of 10:1. The ball milling speed was 250 r / min and the ball milling treatment was 3 h. The material obtained by ball milling was then placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution was 7 mol / L, the hydrothermal temperature was 120 ℃, and the hydrothermal time was 6 h. After the hydrothermal treatment was completed, the obtained product was washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. The obtained product was then placed in a muffle furnace and calcined at 500 ℃ for 4 h to finally obtain a BiV ion-doped catalyst, which was recorded as S-4.

[0033] Embodiment 5 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: 73.5 g of SrSO4 and 6.2 g of MgF2 were weighed, and then placed in a ball mill according to the mass ratio of grinding balls to raw materials of 10:1, and the ball milling speed was 400 r / min, and the ball milling treatment was 8 h. Then the material obtained by ball milling was placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution was 13 mol / L, the hydrothermal temperature was 200 ℃, and the hydrothermal time was 16 h. After the hydrothermal treatment was completed, the obtained product was washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. Then the obtained product was placed in a muffle furnace and calcined at 700 ℃ for 8 h, and finally a SrMg ion-doped catalyst was obtained, which was recorded as S-5.

[0034] Embodiment 6 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: 17.9 g of ZnSO4·H2O and 30.6 g of Al2O3 were weighed and then placed in a ball mill with a mass ratio of 10:1 between the grinding balls and the raw materials. The ball milling speed was 300 r / min and the ball milling treatment was performed for 4 h. The material obtained by ball milling was then placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution was 9 mol / L, the hydrothermal temperature was 150 ℃, and the hydrothermal time was 8 h. After the hydrothermal treatment was completed, the obtained product was washed and filtered 3 times, and then placed in a blast drying oven for drying at 120 ℃ for 12 h. The obtained product was then placed in a muffle furnace for calcination at 600 ℃ for 5 h, and finally a ZnAl ion-doped catalyst was obtained, which was recorded as S-6.

[0035] Embodiment 7 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: 70 g of BaSO4 and 12.3 g of ZrO2 were weighed, and then placed in a ball mill according to the mass ratio of grinding balls to raw materials of 10:1, and the ball milling speed was 350 r / min, and the ball milling treatment was 5 h. Then, the material obtained by ball milling was placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution was 8 mol / L, the hydrothermal temperature was 180 ℃, and the hydrothermal time was 10 h. After the hydrothermal treatment was completed, the obtained product was washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. Then, the obtained product was placed in a muffle furnace and calcined at 550 ℃ for 6 h, and finally a BaZr ion-doped catalyst was obtained, which was recorded as S-7.

[0036] Embodiment 8 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: Weigh 46.7 g of BaSO4 and 4 g of MgO, then place them in a ball mill and add grinding balls according to the mass ratio of grinding balls to raw materials of 10:1, the ball mill speed is 300 r / min, and the ball milling treatment is 6 h. Then the ball milled material is placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution is 10 mol / L, the hydrothermal temperature is 160 ℃, and the hydrothermal time is 12 h. After the hydrothermal treatment is completed, the obtained product is washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. Then the obtained product is placed in a muffle furnace and calcined at 650 ℃ for 7 h, and finally a BaMg ion-doped catalyst is obtained, which is recorded as S-8.

[0037] Embodiment 9 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: Weigh 55.1 g of SrSO4 and 37 g of V2O5, then place them in a ball mill and add grinding balls according to the mass ratio of grinding balls to raw materials of 10:1, the ball mill speed is 350 r / min, and the ball milling treatment is 7 h. Then the ball milled material is placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution is 11 mol / L, the hydrothermal temperature is 170 ℃, and the hydrothermal time is 14 h. After the hydrothermal treatment is completed, the obtained product is washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. Then the obtained product is placed in a muffle furnace and calcined at 600 ℃ for 6 h, and finally a SrV ion-doped catalyst is obtained, which is recorded as S-9.

[0038] Embodiment 10 of the present invention is: a method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, comprising the following steps: 35.9 g of ZnSO4·H2O and 60.8 g of Cr2O3 were weighed and then placed in a ball mill according to the mass ratio of grinding balls to raw materials of 10:1. The ball milling speed was 400 r / min and the ball milling treatment was 6 h. The material obtained by ball milling was then placed in a hydrofluoric acid solution for hydrothermal treatment. The concentration of the hydrofluoric acid solution was 12 mol / L, the hydrothermal temperature was 180 ℃, and the hydrothermal time was 15 h. After the hydrothermal treatment was completed, the obtained product was washed and filtered 3 times, and then placed in a blast drying oven at 120 ℃ for 12 h. The obtained product was then placed in a muffle furnace and calcined at 550 ℃ for 8 h to finally obtain a ZnCr ion-doped catalyst, which was recorded as S-10.

[0039] Embodiment 11 of the present invention is: an ion-doped catalyst prepared by the preparation methods of embodiments 1 to 10 respectively.

[0040] Example 12 of the present invention: Application of the ion-doped catalyst prepared in Example 1-10 in the reaction of co-cracking and dehydrohalogenating 1,1,2,3,3-pentafluoropropylene and difluoromonochloromethane to generate hexafluoro-1,3-butadiene in one step, the catalyst activity evaluation was carried out in a fixed bed reactor at normal pressure, the steps are as follows: The reaction tube of the tubular reactor is a stainless steel tube with an inner diameter of 25 mm and a length of 1200 mm. 20 mL of ion-doped catalyst particles are loaded into the tubular reactor. The particle size of the ion-doped catalyst is 20-40 mesh. After the catalyst is loaded, 100 mL / min of N2 is introduced and the temperature is raised to 300 °C for dehydration and activation for 2 h. After the dehydration and activation are completed, the temperature is raised to 500 °C, and then a mixed gas of 1,1,2,3,3-pentafluoropropylene and difluorochloromethane is introduced for reaction. The volume ratio of 1,1,2,3,3-pentafluoropropylene to difluorochloromethane is 1:4, and the catalytic reaction space velocity is 900 h -1 The reaction pressure is normal pressure. The tail gas generated by the reaction is washed with alkali, washed with water, and dried before being analyzed and detected online by gas chromatography. The analysis results are shown in Table 1.

[0041] Table 1 lists the catalysts prepared in Examples 1 to 10 according to the above process conditions (i.e., normal pressure, 500 °C reaction temperature, 900 h -1 The catalyst activity test results at 37 °C space velocity (sampling results after 50 h of reaction, with the conversion rate of 1,1,2,3,3-pentafluoropropylene and the selectivity of hexafluoro-1,3-butadiene as indicators).

[0042] Table 1

[0043] It can be seen from the activity results in Table 1 that when the ion-doped catalyst provided by the method of the present invention is used for the co-cracking and dehydrohalogenation of 1,1,2,3,3-pentafluoropropylene and difluorochloromethane to generate hexafluoro-1,3-butadiene in one step, it has a high conversion rate and selectivity, and the catalyst life is long.

[0044] In summary, the preparation method of the ion-doped catalyst provided by the present invention is simple, easy to repeat, and the raw materials are cheap and easily available; when it is used for the co-cracking and dehydrohalogenation of 1,1,2,3,3-pentafluoropropylene and difluoromonochloromethane to generate hexafluoro-1,3-butadiene in one step, it has a high conversion rate and selectivity, and the catalyst life is long.

[0045] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the specification of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene, characterized in that: The following steps are involved: The first metal sulfate and the second metal fluoride or the second metal oxide are subjected to mechanical ball milling treatment, and then transferred to a hydrothermal kettle for hydrothermal treatment to achieve ion doping; after the hydrothermal treatment, the product is washed and dried, and finally placed in a muffle furnace for calcination to obtain an ion-doped catalyst.

2. The method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to claim 1, characterized in that: The first metal sulfate is any one of BaSO4, SrSO4, CaSO4, NiSO4·6H2O, ZnSO4·H2O and Bi2(SO4)3; the second metal fluoride is AlF3 or MgF2; the second metal oxide is any one of Cr2O3, Al2O3, MgO, V2O5, Co3O4 and ZrO2.

3. The method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to claim 1, characterized in that: The molar ratio of the first metal sulfate to the second metal fluoride is 10:1-1:10, and the molar ratio of the first metal sulfate to the second metal oxide is 10:1-1:

10.

4. The method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to claim 1, characterized in that: The mechanical ball milling treatment time is 1-12 h, the rotation speed is 100-500 r / min, and the mass ratio of the grinding balls to the raw materials is 10:

1.

5. The method for preparing the ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to claim 1, characterized in that: The hydrothermal treatment time is 3 to 24 hours, and the temperature is 100 to 250°C.

6. The method for preparing the ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to claim 1, characterized in that: A solvent is added during the hydrothermal treatment, and the solvent is a hydrofluoric acid solution with a concentration of 3-20 mol / L.

7. The method for preparing the ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to claim 1, characterized in that: The washing and drying is specifically as follows: washing with water and filtering for 3 times, and then placing in a forced air drying oven for drying at 120° C. for 12 h.

8. The method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to claim 1, characterized in that: The calcination process is performed at a temperature of 400 to 900°C and a time of 2 to 12 hours.

9. An ion-doped catalyst prepared by the method for preparing an ion-doped catalyst for the synthesis of hexafluoro-1,3-butadiene according to any one of claims 1 to 8.

10. Use of the ion-doped catalyst according to claim 9 in the reaction of co-cracking and dehydrohalogenating 1,1,2,3,3-pentafluoropropylene and difluoromonochloromethane to produce hexafluoro-1,3-butadiene in one step.

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