Method for preparing liquid fuel or high-value product by catalyzing efficient hydrogenation of plastic waste

Abstract

A method for preparing liquid fuel or high-value products by catalyzing efficient hydrogenation of plastic waste relates to the technical field of plastic waste conversion, and comprises the following steps: placing plastic waste and a catalyst in a mechanical stirring kettle, then filling hydrogen, and carrying out hydrogenation reaction on the plastic waste under pressure and temperature to prepare the liquid fuel or the high-value products; the plastic waste comprises polystyrene, polyallylbenzene, polyethylene and polyethylene glycol terephthalate; the liquid fuel is a C5-30 hydrocarbon substance, and the high-value product is terephthalic acid; the preparation method comprises the following steps: uniformly dispersing a molecular sieve in an aqueous solution of a metal salt, heating, stirring, refluxing, carrying out centrifugal washing, drying, and finally carrying out hydrogen reduction, thereby obtaining the catalyst. Plastic wastes such as polyethylene, polypropylene, polystyrene, polyethylene glycol terephthalate and the like can be efficiently and stably catalytically converted, and the target product selectivity is high. In addition, the preparation method of the catalyst is simple and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic waste conversion, and in particular to a method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products. Background Art

[0002] Plastics are widely used in all walks of life due to their low cost, light weight, good durability and strong stability. However, their large-scale production, single-use, slow decomposition and damage to sensitive ecosystems have caused increasingly serious "white pollution". The main destination of these plastic wastes is to enter the land and ocean through landfills, or enter the atmosphere through incineration, destroying the ecological balance. Therefore, the upgrading and recycling of waste plastics is imminent. One of the strategies is to develop new catalysts to efficiently convert waste plastics into liquid fuels or high-value products, thereby reducing the impact of plastics on the environment and human health, as well as human dependence on oil, and ultimately turning waste into treasure. Therefore, the reaction of hydrogenating waste plastics to prepare liquid fuels or high-value products has received widespread attention.

[0003] At present, ordinary supported catalysts are used as catalysts for hydrogenating waste plastics to produce liquid fuels. Such catalysts have the disadvantages of high metal loading, large catalyst dosage, low reaction activity, long reaction time, and poor stability in the hydrogenation of waste plastics to produce liquid fuels or high-value products. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and provide a method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products. The metal catalyst is encapsulated by molecular sieve to achieve metal protection and improve reaction activity. It can be used for the degradation of various plastics to stably produce liquid fuel and high-value products. The liquid fuel is C 5-30 Hydrocarbon substances, the high-value product is terephthalic acid.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products, wherein plastic waste and a catalyst are placed in a mechanical stirring kettle, and then hydrogen is filled in, and the plastic waste is hydrogenated under pressure and temperature to produce liquid fuel or high-value products; the plastic waste includes polystyrene (PS), polyphenylene propylene (PP), polyethylene (PE), and polyethylene terephthalate (PET); the catalyst is a catalyst of molecular sieve encapsulated metal, and the preparation method is as follows: the molecular sieve is uniformly dispersed in an aqueous solution of a metal salt, heated and stirred to reflux, then centrifuged and washed, dried, and finally reduced with hydrogen.

[0007] The metal is at least one of Ru, Rh, Pd, Au, Pt, and Ni, the metal loading is 0.01% to 5%, the molecular sieve is at least one of ZSM-5, MCM-22, Y, USY, Beta, and MCM-41, and the silicon-aluminum ratio is 3 to 500.

[0008] The molecular sieve is hydrogen type, ammonia type, sodium type or potassium type. The metal salt is a chloride, nitrate, carbonyl compound, acetylacetonate compound of the metal; for example, chloride, nitrate, carbonyl compound, acetylacetonate compound, etc., for example, palladium chloride, ruthenium chloride, rhodium chloride, nickel chloride, chloroauric acid, palladium nitrate, ruthenium nitrate, rhodium nitrate, nickel nitrate, carbonyl ruthenium, carbonyl rhodium, carbonyl nickel, acetylacetonate ruthenium, acetylacetonate platinum, acetylacetonate palladium, acetylacetonate rhodium, acetylacetonate nickel, etc.

[0009] The temperature of the heating, stirring and reflux is 100-160°C, the time is 1-24h. The temperature of the hydrogen reduction is 250-600°C, the hydrogen flow rate is 10-100mL / min, the hydrogen concentration is 99.99%, and the reduction time is 1-6h.

[0010] The mass ratio of the plastic waste to the catalyst is 20 to 100:1.

[0011] The reaction temperature is 260-290° C.; the reaction pressure is 0.1-5 MPa; and the reaction time is 0.5-5 h.

[0012] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0013] The preparation method of the present invention is simple. By preparing a molecular sieve encapsulated metal catalyst, which is used to catalyze the reaction of efficiently hydrogenating plastic waste to produce liquid fuel or high-value products, the conversion efficiency of waste plastics can be significantly improved. The selectivity of liquid fuel can be as high as 91%, and the selectivity of high-value products can be as high as 95%.

[0014] The molecular sieve encapsulated metal catalyst prepared by the present invention has metal nanoparticles inside that improve the ability to activate hydrogen under actual reaction conditions, thereby significantly improving the performance of hydrogenating waste plastics to prepare liquid fuels or high-value products.

[0015] The catalyst prepared by the present invention encapsulates the metal inside the commercial molecular sieve, so that in the actual reaction, the metal is separated from the waste plastics participating in the reaction, that is, the metal only plays the role of activating hydrogen, which greatly improves the ability of the metal to activate hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a transmission electron microscopy image of a frozen section of Ru@Beta molecular sieve encapsulated with metal catalyst. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] The method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products of the present invention comprises the following steps: the catalyst is a molecular sieve encapsulated metal catalyst, the composition of which can be recorded as M@Zeolite, wherein M is Ru, Rh, Pd, Au, Pt, Ni, etc., the loading amount of M is 0.01% to 5%, the zeolite is ZSM-5, MCM-22, Y, USY, Beta, MCM-41, etc., and the silicon-aluminum ratio is 3 to 500.

[0019] The plastic waste includes polystyrene (PS), polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET); the plastic waste is mixed with the catalyst and placed in a mechanically stirred high-temperature and high-pressure reactor to react and convert at a certain temperature and pressure to finally obtain liquid fuel or high-value products.

[0020] The method comprises the following steps:

[0021] (1) Prepare 1 mol / L ammonium chloride or sodium nitrate, potassium nitrate aqueous solution, then add a certain amount of commercial molecular sieve (silicon-aluminum ratio of 3-500) in the ratio of 1g molecular sieve: 50mL ammonium chloride, sodium nitrate, potassium nitrate aqueous solution, stir and disperse evenly, and then stir at 80℃ for 2h. Centrifugal wash, and bake at 110℃ for 6h. Repeat the above steps 3 times, grind into powder for use, and mark it as NH4-Zeolite, Na-Zeolite, K-Zeolite. Weigh 5.0g NH4Cl-Zeolite and roast it in a porcelain boat. The roasting conditions are to increase the temperature to 550℃ at 5℃ / min, maintain for 6h, and naturally cool to room temperature for use, and mark it as H-Zeolite.

[0022] (2) Prepare a certain concentration of metal precursor aqueous solution, heat and stir until it is completely dissolved, then add a certain amount of NH4-Zeolite or Na-Zeolite or K-Zeolite or H-Zeolite and stir until it is evenly dispersed, place it in an oil bath and heat and reflux it at a certain temperature for a certain time. After cooling to room temperature, centrifuge and wash it with water until it is colorless, dry it at 110°C overnight, grind it into powder, and put it into a quartz tube. The temperature of heating, stirring and reflux is 100-160°C; the hydrogen reduction temperature is 250-600°C, the hydrogen flow rate is 10-100mL / min, the hydrogen concentration is 99.99%, and the reduction time is 1-6h.

[0023] (3) The reaction performance evaluation of the catalyst-catalyzed hydrogenation of waste plastics to prepare liquid fuels or high-value products is carried out in a mechanically stirred high-temperature and high-pressure autoclave, and the products are detected by gas chromatography. A certain amount of plastic waste and a certain amount of catalyst are placed in a mechanically stirred autoclave, and then 99.99% hydrogen is filled in, and the waste plastics are hydrogenated to prepare liquid fuels or high-value products at a certain pressure and temperature; the mass ratio of the plastic waste to the catalyst is 20 to 100:1; the reaction time is 0.5 to 5 hours, the reaction temperature is 260 to 290°C, and the reaction pressure is 0.1 to 5MPa. The reaction products are analyzed and detected by gas chromatography, and TCD and FID detectors are used for quantitative analysis of the products.

[0024] Example 1

[0025] Weigh 42.5g of sodium nitrate and dissolve it in 500mL of deionized water to prepare a 1mol / L sodium nitrate aqueous solution. Add 10.0g of commercial ZSM-5 molecular sieve (silicon-aluminum ratio of 13) to the aqueous solution and stir to disperse evenly. Stir the mixed solution at 80℃ for 2h. After cooling to room temperature, wash with deionized water 4 to 5 times. Bake at 110℃ for 6h, then heat to 550℃ at 5℃ / min, maintain for 6h, and cool naturally for use. Marked as Na-ZSM-5.

[0026] Weigh 20 mg of palladium nitrate in a 100 mL round-bottom flask, add to 50 mL of deionized water, heat and stir until completely dissolved. Weigh 2 g of Na-ZSM-5 and add to the palladium nitrate aqueous solution, place in a 100 ° C oil bath and heat and reflux for 24 hours. Cool to room temperature, centrifuge and wash with deionized water 4 to 5 times until the supernatant is colorless and transparent, and dry at 110 ° C overnight. Then reduce the above powder with hydrogen at 300 ° C for 6 hours, marked as Pd@ZSM-5.

[0027] Next is the evaluation of the catalytic performance of Pd@ZSM-5 in the hydrogenation of waste plastics to produce liquid fuels.

[0028] Weigh 1.00g polyethylene (PE) and 0.06g Pd@ZSM-5 and place them in a 100mL mechanically stirred high-temperature and high-pressure autoclave. Seal the autoclave, fill the autoclave with 3MPa hydrogen and then release the pressure. Repeat the operation 4 times for replacement, and finally fill the autoclave with 3MPa hydrogen. Place the mechanically stirred high-temperature and high-pressure reactor in the corresponding heating furnace, set the target temperature to 275℃, the temperature control time to 30min, the stirring rate to 500rmp, and then choose to start the operation. After the reaction is completed, take out the reactor immediately and place it in ice water to cool down quickly. When it drops below room temperature, connect the reactor to a gas chromatograph to sample and detect the gas phase product. After sampling, quickly open the reactor, extract the liquid product with 13mL CH2Cl2, and add 10mg 1,3,5-trimethylbenzene as an internal standard. Then use gas chromatography to detect and quantitatively analyze the extracted liquid. The evaluation of the catalyst results is shown in Table 1.

[0029] Similarly, the above polyethylene (PE) is replaced by polypropylene (PP), and other operations are the same as above, and the catalytic performance results of Pd@ZSM-5 in the hydrogenation of polypropylene (PP) to prepare liquid fuel are obtained, as shown in Table 1.

[0030] The above polyethylene (PE) was replaced by polystyrene (PS), and other operations were the same as above, and the catalytic performance results of Pd@ZSM-5 in the hydrogenation of polystyrene (PS) to prepare liquid fuel were obtained, as shown in Table 1.

[0031] When the above polyethylene (PE) is replaced by polyethylene terephthalate (PET), the other reaction operations are the same as above. After the reaction is completed, the reactor is immediately taken out and placed in ice water for rapid cooling. When it drops below room temperature, the reactor is connected to a gas chromatograph for sampling and detection of gas phase products. After the sampling is completed and the gas is detected, the reactor is opened and the inside of the reactor is rinsed with 100mL 0.01mol / L NaOH aqueous solution to convert the product terephthalic acid into water-soluble sodium terephthalate, and then the unconverted solid and the catalyst are separated by filtration. The obtained sodium terephthalate aqueous solution is acidified with dilute sulfuric acid to obtain white precipitated terephthalic acid, which is filtered again to obtain a high-value product-terephthalic acid, which is dried at 60°C for 6h. The evaluation of the catalyst results is shown in Table 1.

[0032] Example 2

[0033] Weigh 50.5g potassium nitrate and dissolve it in 500mL deionized water to prepare a 1mol / L potassium nitrate aqueous solution. Add 10.0g commercial MCM-22 molecular sieve (silicon-aluminum ratio is 13) to the aqueous solution and stir to disperse evenly. Stir the mixed solution at 80℃ for 2h. After cooling to room temperature, wash with deionized water 4 to 5 times. Bake at 110℃ for 6h, then heat to 550℃ at 5℃ / min, maintain for 6h, and cool naturally for use. Marked as K-MCM-22.

[0034] Weigh 23 mg of rhodium trichloride in a 100 mL round-bottom flask, add to 50 mL of deionized water, heat and stir until completely dissolved. Weigh 2 g of K-MCM-22 and add to the rhodium trichloride aqueous solution, place in a 100 ° C oil bath and heat and reflux for 24 hours. Cool to room temperature, centrifuge and wash with deionized water 4 to 5 times until the supernatant is colorless and transparent, and dry at 110 ° C overnight. Then reduce the above powder with hydrogen at 400 ° C for 4 hours, marked as Rh @ MCM-22. The catalyst evaluation operation is the same as in Example 1, and the results are shown in Table 1.

[0035] Example 3

[0036] Weigh 26.7g NH4Cl and dissolve it in 500mL deionized water to prepare a 1mol / L NH4Cl aqueous solution. Add 10.0g commercial USY molecular sieve (silicon-aluminum ratio of 6) to the aqueous solution and stir to disperse evenly. Stir the mixed solution at 80℃ for 2h. After cooling to room temperature, wash with deionized water 4-5 times. Bake at 110℃ for 6h, then heat to 550℃ at 5℃ / min, maintain for 6h, and cool naturally for use. Mark as H-USY.

[0037] Weigh 32 mg of platinum nitrate in a 100 mL round-bottom flask, add to 50 mL of deionized water, heat and stir until completely dissolved. Weigh 2 g of H-USY and add to the platinum nitrate aqueous solution, place in a 100 ° C oil bath and heat and reflux for 24 hours. Cool to room temperature, centrifuge and wash with deionized water 4 to 5 times until the supernatant is colorless and transparent, and dry at 110 ° C overnight. Then reduce the above powder with hydrogen at 400 ° C for 4 hours, marked as Pt@USY. The catalyst evaluation operation is the same as Example 1, and the results are shown in Table 1.

[0038] Example 4

[0039] Weigh 26.7g NH4Cl and dissolve it in 500mL deionized water to prepare a 1mol / L NH4Cl aqueous solution. Add 10.0g commercial Beta molecular sieve (silicon-aluminum ratio of 12.5) to the aqueous solution and stir to disperse evenly. Stir the mixed solution at 80℃ for 2h. After cooling to room temperature, wash with deionized water for 4-5 times. Bake at 110℃ for 6h to obtain NH4-Beta.

[0040] Weigh 38 mg of ruthenium acetylacetonate hydrate in a 100 mL round-bottom flask, add to 50 mL of deionized water, heat and stir until completely dissolved. Weigh 2 g of NH4-Beta and add to the ruthenium acetylacetonate aqueous solution, place in a 100 ° C oil bath and heat and reflux for 24 hours. Cool to room temperature, centrifuge and wash with deionized water 4-5 times until the supernatant is colorless and transparent, and dry at 110 ° C overnight. Then reduce the above powder with hydrogen at 400 ° C for 4 hours, marked as Ru@Beta. The catalyst evaluation operation is the same as in Example 1. The evaluation results are shown in Table 1.

[0041] Example 5

[0042] Weigh 26.7g NH4Cl and dissolve it in 500mL deionized water to prepare a 1mol / L NH4Cl aqueous solution. Add 10.0g commercial Y molecular sieve (silicon-aluminum ratio of 3) to the aqueous solution and stir to disperse evenly. Stir the mixed solution at 80℃ for 2h. After cooling to room temperature, wash with deionized water 4-5 times. Bake at 110℃ for 6h, then heat to 550℃ at 5℃ / min, maintain for 6h, and cool naturally for use. Mark as HY.

[0043] Weigh 120 mg of chloroauric acid in a 100 mL round-bottom flask, add to 50 mL of deionized water, heat and stir until completely dissolved. Weigh 2 g of HY and add to the chloroauric acid aqueous solution, place in a 100 ° C oil bath and heat and reflux for 24 hours. Cool to room temperature, centrifuge and wash with deionized water 4-5 times until the supernatant is colorless and transparent, and dry at 110 ° C overnight. Then reduce the above powder with hydrogen at 400 ° C for 4 hours, marked as Au@Y. The catalyst evaluation operation is the same as Example 1, and the results are shown in Table 1.

[0044] Example 6

[0045] Weigh 50.5g potassium nitrate and dissolve it in 500mL deionized water to prepare a 1mol / L potassium nitrate aqueous solution. Add 10.0g commercial MCM-41 molecular sieve (silicon-aluminum ratio is 14) to the aqueous solution and stir to disperse evenly. Stir the mixed solution at 80℃ for 2h. After cooling to room temperature, wash with deionized water 4 to 5 times. Bake at 110℃ for 6h, then heat to 550℃ at 5℃ / min, maintain for 6h, and cool naturally for use. Marked as K-MCM-41.

[0046] Weigh 54 mg of nickel carbonyl in a 100 mL round-bottom flask, add to 50 mL of deionized water, heat and stir until completely dissolved. Weigh 2 g of K-MCM-41 and add to the nickel carbonyl aqueous solution, place in a 100 ° C oil bath and heat and reflux for 24 hours. Cool to room temperature, centrifuge and wash with deionized water 4-5 times until the supernatant is colorless and transparent, and dry at 110 ° C overnight. Then reduce the above powder with hydrogen at 400 ° C for 4 hours, marked as Ni@MCM-41. The catalyst evaluation operation is the same as Example 1, and the results are shown in Table 1.

[0047] The present invention encapsulates metals such as Ru, Rh, Pd, Au, Pt, Ni, etc. inside molecular sieves such as ZSM-5, MCM-22, Y, USY, Beta, MCM-41, etc., and has high activity in the hydrogenation reaction of waste plastics (including polyethylene PE, polypropylene PP, polystyrene PS, polyethylene terephthalate PET, etc.) to prepare liquid fuels or high-value products.

[0048] from Figure 1 It can be seen that the molecular sieve encapsulation metal prepared by this method is successful. Figure 1 In the process, the catalyst is first subjected to cryosectioning, and the middle layer of the molecular sieve is taken for transmission electron microscopy characterization. As can be seen from the figure, the metal ruthenium is evenly distributed inside the molecular sieve. Therefore, the preparation method of the present invention can successfully encapsulate the metal inside the molecular sieve.

[0049] Comparative Example 1

[0050] 0.5 g of activated carbon and 3 mg of palladium chloride were added to 25 mL of deionized water and stirred at room temperature for 4 h. Then, it was placed in an 80°C water bath and evaporated to dryness, followed by drying at 110°C overnight. Then, it was reduced at 400°C for 4 h with 40 mL / min of 99.99% hydrogen and marked as Pd / C. The reaction performance evaluation procedure was the same as in Example 1, and the catalyst evaluation results are shown in Table 1.

[0051] Comparative Example 2

[0052] 0.5 g TiO2 and 3 mg platinum nitrate were added to 25 mL deionized water and stirred at room temperature for 4 h. Then it was placed in an 80°C water bath to evaporate to dryness, and then dried at 110°C overnight. Then it was reduced at 400°C for 4 h with 40 mL / min 99.99% hydrogen and marked as Pt / TiO2. The reaction performance evaluation steps were the same as in Example 1, and the catalyst evaluation results are shown in Table 1.

[0053] Comparative Example 3

[0054] 0.5 g HBeta molecular sieve and 6 mg ruthenium acetylacetonate were added to 25 mL deionized water and stirred at room temperature for 4 h. Then it was placed in an 80°C water bath to evaporate to dryness, and then dried at 110°C overnight. Then it was reduced at 400°C for 4 h with 40 mL / min 99.99% hydrogen and marked as Ru / Beta. The reaction performance evaluation steps were the same as in Example 1, and the catalyst evaluation results are shown in Table 1.

[0055] Comparative Example 4

[0056] Add 10.6g tetraethyl orthosilicate, 0.4g concentrated hydrochloric acid, 50mg ruthenium trichloride, and 0.2g 3-mercaptopropyltrimethoxysilane to a 50mL beaker in sequence, and stir vigorously at 90℃ for 4h. Then add 7.365g tetraethylammonium hydroxide and 0.512g sodium aluminate to the above gel, stir and disperse evenly, and then stand at room temperature for aging for 24h. Then transfer the above gel to a 50mL hydrothermal kettle and place it in a 140℃ oven for crystallization for 14 days. Finally, centrifuge and wash with water until neutral. The obtained solid is first dried in a 110℃ oven for 6h, then transferred to a muffle furnace and heated to 550℃ at 5℃ / min for 6h and then cooled naturally. Then weigh 1.0g of the above solid, disperse it in 50mL 1mol / L NH4Cl aqueous solution, and stir and disperse it evenly. Stir the mixed solution at 80℃ for 2h. After cooling to room temperature, wash it with deionized water 4 to 5 times. After baking at 110°C for 6 hours, it was reduced at 400°C for 4 hours with 40 mL / min 99.99% hydrogen and labeled as Ru@Beta-in situ. The reaction performance evaluation procedure was the same as in Example 1, and the catalyst evaluation results are shown in Table 1.

[0057] Table 1

[0058]

[0059] The preparation method of the present invention is simple. By preparing a commercial molecular sieve encapsulated metal catalyst, which is used for hydrogenating waste plastics to prepare liquid fuels or high-value products, the conversion rate of waste plastics can be significantly improved. The liquid fuel selectivity can be as high as 91%, and the high-value product selectivity can be as high as 95%.

Claims

1. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products, characterized in that: Plastic waste and catalyst are placed in a mechanical stirring kettle, and then hydrogen is filled in, and the plastic waste is hydrogenated under pressure and temperature to prepare liquid fuel or high-value products; the plastic waste includes polystyrene, polypropylene, polyethylene, and polyethylene terephthalate; the catalyst is a molecular sieve encapsulated metal catalyst, and the preparation method is as follows: the molecular sieve is evenly dispersed in an aqueous solution of a metal salt, heated and stirred to reflux, then centrifuged and washed, dried, and finally reduced with hydrogen.

2. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1, characterized in that: The metal is at least one of Ru, Rh, Pd, Au, Pt, and Ni, the metal loading is 0.01% to 5%, the molecular sieve is at least one of ZSM-5, MCM-22, Y, USY, Beta, and MCM-41, and the silicon-aluminum ratio is 3 to 500.

3. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1 or 2, characterized in that: The molecular sieve is of hydrogen type, ammonia type, sodium type or potassium type.

4. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1, characterized in that: The metal salt is a metal chloride, a nitrate, a carbonyl compound, or an acetylacetonate compound.

5. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1, characterized in that: The temperature of the heating, stirring and reflux is 100-160°C.

6. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1, characterized in that: The temperature of the hydrogen reduction is 250-600°C.

7. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1, characterized in that: The mass ratio of the plastic waste to the catalyst is 20 to 100:

1.

8. The method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1, characterized in that: The reaction temperature is 260-290°C.

9. A method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products as claimed in claim 1, characterized in that: The reaction pressure is 0.1-5 MPa.

10. The method for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products according to claim 1, characterized in that: The reaction time is 0.5 to 5 hours.

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