A method for efficiently hydrogenating catalytic plastic waste into liquid fuel or high-value products

Abstract

The application relates to a method for efficiently catalytically hydrogenating plastic waste to liquid fuel or high-value products, and relates to the technical field of plastic waste conversion. Plastic waste and a catalyst are placed in a mechanical stirring kettle, hydrogen is filled in, and the plastic waste hydrogenation reaction for preparing liquid fuel or high-value products is carried out under pressure and temperature; the plastic waste includes polystyrene, polyphenylpropylene, polyethylene and polyethylene terephthalate; the liquid fuel is C 5‑30 hydrocarbon substances, the high-value product is terephthalic acid, and the catalyst is a molecular sieve encapsulated metal catalyst, which is prepared by the following method: uniformly dispersing molecular sieves in an aqueous solution of a metal salt, heating, stirring and refluxing, then performing centrifugal washing, drying, and finally reducing by hydrogen. The application can efficiently and stably catalytically convert plastic waste such as polyethylene, polypropylene, polystyrene and polyethylene terephthalate, and the selectivity of the target product is high. In addition, the preparation method of the catalyst is simple and low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastic waste conversion, and particularly relates to a method for efficiently preparing liquid fuel or high-value product by catalyzing plastic waste hydrogenation. BACKGROUND

[0002] Plastics have very wide applications in various industries due to their low cost, light weight, good durability and strong stability. However, their large-scale production, one-time use, slow decomposition and damage to sensitive ecological systems have caused increasingly serious 'white pollution'. These plastic wastes mainly end up in land and ocean through landfill or in the atmosphere through incineration, which destroys the ecological balance. Therefore, the upgrading and recycling of waste plastics are imminent. One strategy is to develop new catalysts to efficiently convert waste plastics into liquid fuel or high-value product, so as to reduce the impact of plastics on the environment and human health, and the dependence of humans on petroleum, and ultimately realize the transformation of waste into treasure. Therefore, the reaction of preparing liquid fuel or high-value product by hydrogenation of waste plastics has attracted widespread attention.

[0003] Currently, ordinary supported catalysts are used as catalysts for preparing liquid fuel by hydrogenation of waste plastics. Such catalysts have the disadvantages of high metal loading, large catalyst consumption, low reaction activity, long reaction time and poor stability in the reaction of preparing liquid fuel or high-value product by hydrogenation of waste plastics. SUMMARY

[0004] The present application aims to solve the above problems in the prior art, and provides a method for efficiently preparing liquid fuel or high-value product by catalyzing plastic waste hydrogenation. The metal catalyst is encapsulated by molecular sieve, the metal is protected, the reaction activity is improved, and the degradation of various plastics can be realized, the production of liquid fuel and high-value product is stable, the liquid fuel is C 5-30 hydrocarbon material, and the high-value product is terephthalic acid.

[0005] To achieve the above purpose, the technical scheme is as follows:

[0006] A method for efficiently preparing liquid fuel or high-value product by catalyzing plastic waste hydrogenation, plastic waste and catalyst are placed in a mechanical agitator tank, then hydrogen is filled, and the reaction of preparing liquid fuel or high-value product by hydrogenation of plastic waste is carried out under pressure and temperature; the plastic waste includes polystyrene (PS), polyphenylacrylate (PP), polyethylene (PE) and polyethylene terephthalate (PET); the catalyst is a metal-encapsulated molecular sieve catalyst, and the preparation method is as follows: the molecular sieve is uniformly dispersed in an aqueous solution of metal salt, heated and stirred under reflux, then centrifuged, washed with water and dried, and finally reduced by hydrogen.

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

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

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

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

[0011] The temperature of the reaction is 260 to 290 DEG C, the pressure of the reaction is 0.1 to 5 MPa, and the time of the reaction is 0.5 to 5 hours.

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

[0013] The preparation method of the present application is simple, the molecular sieve encapsulated metal catalyst is used for catalyzing the efficient hydrogenation of plastic waste to produce liquid fuel or high-value products, the conversion efficiency of the waste plastic material can be significantly improved, the selectivity of the liquid fuel can be as high as 91%, and the selectivity of the high-value product can be as high as 95%.

[0014] The molecular sieve encapsulated metal catalyst prepared by the present application improves the ability of activating hydrogen gas under actual reaction conditions, and significantly improves the performance of the waste plastic material in the hydrogenation to produce liquid fuel or high-value products.

[0015] The catalyst prepared by the present application encapsulates the metal inside the commercial molecular sieve, so that the metal is separated from the waste plastic material participating in the reaction in the actual reaction, that is, the metal only plays a role in activating hydrogen gas, and the ability of the metal to activate hydrogen gas is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a freeze section transmission electron microscope image of the Ru@Beta molecular sieve encapsulated metal catalyst. DETAILED DESCRIPTION

[0017] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clear, specific, the present application is further described in detail below in combination with the drawings and examples.

[0018] The method for efficiently hydrogenating catalytic plastic waste to liquid fuel or high-value product, the catalyst is a molecular sieve encapsulated metal catalyst, which can be represented as M@Zeolite, M is Ru, Rh, Pd, Au, Pt, Ni, etc., the loading amount of M is 0.01% to 5%, 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), polyphenylacrylate (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 reaction kettle to react under certain temperature and pressure, and finally liquid fuel or high-value product is obtained.

[0020] The method comprises the following steps:

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

[0022] (2) Configure 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 uniformly dispersed, place in an oil bath at a certain temperature and heat to reflux for a certain time. When it cools to room temperature, centrifugal water washing until colorless, 110℃ drying overnight, then grind into powder, load into a quartz tube, the temperature of heating, stirring and refluxing is 100-160℃; the hydrogen reduction temperature is 250-600℃, 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 in the reaction of preparing liquid fuel or high-value product from waste plastic material by hydrogenation is carried out in a mechanical stirring high-temperature and high-pressure kettle, and the product is detected by gas chromatography analysis. A certain amount of plastic waste and a certain amount of catalyst are placed in a mechanical stirring kettle, then 99.99% hydrogen is filled, and the reaction of preparing liquid fuel or high-value product from waste plastic material by hydrogenation is carried out at a certain pressure and temperature; the mass ratio of the plastic waste to the catalyst is 20-100:1; the reaction time is 0.5-5 h, the reaction temperature is 260-290°C, and the reaction pressure is 0.1-5 MPa. The reaction product is analyzed and detected by gas chromatography, and TCD and FID detectors are used for quantitative analysis of the product.

[0024] Example 1

[0025] 42.5 g of sodium nitrate was weighed and dissolved in 500 mL of deionized water to prepare a 1 mol / L sodium nitrate aqueous solution. 10.0 g of commercial ZSM-5 molecular sieve (silicon aluminum ratio of 13) was added to the aqueous solution and stirred and dispersed uniformly. The mixed solution was stirred at 80°C for 2 h. After cooling to room temperature, it was washed with deionized water for 4-5 times. It was baked at 110°C for 6 h, then heated to 550°C at a rate of 5°C / min, kept for 6 h, and naturally cooled for use. It is marked as Na-ZSM-5.

[0026] 20 mg of palladium nitrate was weighed in a 100 mL round-bottom flask, added to 50 mL of deionized water, and heated and stirred until completely dissolved. 2 g of Na-ZSM-5 was added to the palladium nitrate aqueous solution and placed in a 100°C oil bath kettle for heating reflux for 24 h. After cooling to room temperature, it was centrifuged and washed with deionized water for 4-5 times until the supernatant was colorless and transparent, and baked at 110°C overnight. The above powder was then reduced by hydrogen at a temperature of 300°C for 6 h, and marked as Pd@ZSM-5.

[0027] Next, the catalytic performance evaluation of Pd@ZSM-5 in the reaction of preparing liquid fuel from waste plastic material by hydrogenation is carried out.

[0028] Take 1.00 g of polyethylene (PE) and 0.06 g of Pd@ZSM-5 and place them in a 100 mL mechanically stirred high-temperature and high-pressure autoclave. Seal the autoclave, and replace the autoclave with 3 MPa of hydrogen and then release the pressure, repeat the operation 4 times, and finally fill the autoclave with 3 MPa of hydrogen. Place the mechanically stirred high-temperature and high-pressure reaction autoclave in the corresponding heating furnace, set the target temperature to 275°C, the temperature control time to 30 min, the stirring rate to 500 rpm, and then select the start operation. After the reaction is completed, immediately take out the reaction autoclave and place it in ice water for rapid cooling. When it is cooled to below room temperature, connect the reaction autoclave to a gas chromatograph for sampling and detecting gas products. After sampling is completed, quickly open the reaction autoclave, extract the liquid products with 13 mL of CH2Cl2, and add 10 mg of 1,3,5-trimethylbenzene as an internal standard. Then use gas chromatography to detect and quantitatively analyze the extracted liquid. The catalyst results are shown in Table 1.

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

[0030] Similarly, replace the above polyethylene (PE) with polystyrene (PS), and the other operations are the same as above. The catalytic performance results of Pd@ZSM-5 in the reaction of hydrogenation of polystyrene (PS) to prepare liquid fuel are shown in Table 1.

[0031] Similarly, replace the above polyethylene (PE) with polyethylene terephthalate (PET), and the other operations are the same as above. After the reaction is completed, immediately take out the reaction autoclave and place it in ice water for rapid cooling. When it is cooled to below room temperature, connect the reaction autoclave to a gas chromatograph for sampling and detecting gas products. After sampling is completed, after the gas is detected, open the reaction autoclave, and flush the inside of the reaction autoclave with 100 mL of 0.01 mol / L NaOH aqueous solution to convert the product terephthalic acid into sodium terephthalate that is soluble in water, and then separate the unconverted solids and the catalyst by filtration. The obtained sodium terephthalate aqueous solution is acidified with dilute sulfuric acid to obtain white precipitate terephthalic acid, which is further filtered to obtain high-value product terephthalic acid, which is dried at 60°C for 6 h. The catalyst results are shown in Table 1.

[0032] Example 2

[0033] Take 50.5 g of potassium nitrate and dissolve in 500 mL of deionized water to prepare 1 mol / L potassium nitrate aqueous solution. Add 10.0 g of commercial MCM-22 molecular sieve (silicon aluminum ratio of 13) to the aqueous solution and stir to disperse uniformly. Stir the mixed solution at 80°C for 2 h. After cooling to room temperature, wash with deionized water for 4-5 times. Dry at 110°C for 6 h, then heat to 550°C at a rate of 5°C / min, keep for 6 h, and naturally cool down for use. Label as K-MCM-22.

[0034] Take 23 mg of rhodium trichloride in a 100 mL round-bottom flask, add to 50 mL of deionized water, and heat and stir until completely dissolved. Take 2 g of K-MCM-22 and add to the rhodium trichloride aqueous solution, and place in a 100°C oil bath to heat and reflux for 24 h. Cool to room temperature, centrifuge and wash with deionized water for 4-5 times until the supernatant is colorless and transparent, and dry at 110°C overnight. Then hydrogen reduce the above powder under the condition of 400°C for 4 h, and label 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] Take 26.7 g of NH4Cl and dissolve in 500 mL of deionized water to prepare 1 mol / L NH4Cl aqueous solution. Add 10.0 g of commercial USY molecular sieve (silicon aluminum ratio of 6) to the aqueous solution and stir to disperse uniformly. Stir the mixed solution at 80°C for 2 h. After cooling to room temperature, wash with deionized water for 4-5 times. Dry at 110°C for 6 h, then heat to 550°C at a rate of 5°C / min, keep for 6 h, and naturally cool down for use. Label as H-USY.

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

[0038] Example 4

[0039] Take 26.7 g of NH4Cl and dissolve in 500 mL of deionized water to prepare 1 mol / L NH4Cl aqueous solution. Add 10.0 g of commercial Beta molecular sieve (silicon aluminum ratio of 12.5) to the aqueous solution and stir to disperse uniformly. Stir the mixed solution at 80°C for 2 h. After cooling to room temperature, wash with deionized water for 4-5 times. Dry at 110°C for 6 h 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, heated and stirred until completely dissolved. Weigh 2 g of NH4-Beta into the aqueous ruthenium acetylacetonate solution, placed in a 100 °C oil bath for heating and refluxing for 24 h. Cool to room temperature, centrifugal water washing 4-5 times until the supernatant is colorless and transparent, and oven dried at 110 °C overnight. The above powder is further reduced by hydrogen, under the condition of 400 °C for 4 h, and labeled as Ru@Beta. The catalyst evaluation operation is the same as Example 1. The evaluation results are shown in Table 1.

[0041] Example 5

[0042] Weigh 26.7 g of NH4Cl dissolved in 500 mL of deionized water to prepare a 1 mol / L aqueous NH4Cl solution. Add 10.0 g of commercial Y molecular sieve (silicon aluminum ratio of 3) to the aqueous solution and stir to disperse uniformly. Stir the mixed solution at 80 °C for 2 h. After cooling to room temperature, wash with deionized water for 4-5 times. Oven dry at 110 °C for 6 h, then heat to 550 °C at a rate of 5 °C / min, hold for 6 h, and naturally cool for use. Labeled as H-Y.

[0043] Weigh 120 mg of chloroauric acid in a 100 mL round bottom flask, add to 50 mL of deionized water, heated and stirred until completely dissolved. Weigh 2 g of H-Y into the aqueous chloroauric acid solution, placed in a 100 °C oil bath for heating and refluxing for 24 h. Cool to room temperature, centrifugal water washing 4-5 times until the supernatant is colorless and transparent, and oven dried at 110 °C overnight. The above powder is further reduced by hydrogen, under the condition of 400 °C for 4 h, and labeled 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 50.5 g of potassium nitrate dissolved in 500 mL of deionized water to prepare a 1 mol / L aqueous potassium nitrate solution. Add 10.0 g of commercial MCM-41 molecular sieve (silicon aluminum ratio of 14) to the aqueous solution and stir to disperse uniformly. Stir the mixed solution at 80 °C for 2 h. After cooling to room temperature, wash with deionized water for 4-5 times. Oven dry at 110 °C for 6 h, then heat to 550 °C at a rate of 5 °C / min, hold for 6 h, and naturally cool for use. Labeled as K-MCM-41.

[0046] Take 54 mg of nickel carbonyl in a 100 mL round-bottom flask, add to 50 mL of deionized water, heated and stirred until completely dissolved. Take 2 g of K-MCM-41 into the aqueous solution of nickel carbonyl, placed in a 100°C oil bath pot for heating reflux for 24 h. Cool to room temperature, centrifugal water washing 4-5 times with deionized water until the supernatant is colorless and transparent, and oven dried at 110°C overnight. The above powder is further reduced by hydrogen, under the condition of 400°C reduction for 4h, 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 application encapsulates metals such as Ru, Rh, Pd, Au, Pt, Ni, etc. inside ZSM-5, MCM-22, Y, USY, Beta, MCM-41, etc. molecular sieves, which have very high activity in the reaction of hydrogenation 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 preparation of the molecular sieve encapsulated metal by this method is successful. In Figure 1 , the catalyst is first subjected to freeze sectioning treatment, and the middle slice of the molecular sieve is subjected to transmission electron microscopy characterization. It can be seen from the figure that the metal ruthenium is uniformly distributed inside the molecular sieve. Therefore, the preparation method of the present application can successfully encapsulate the metal inside the molecular sieve.

[0049] Comparative Example 1

[0050] Take 0.5 g of activated carbon and 3 mg of palladium chloride into 25 mL of deionized water, stir at room temperature for 4 h. Then place it in a 80°C water bath for evaporation, and then oven dried at 110°C overnight. Then reduce it with 40 mL / min 99.99% hydrogen at 400°C for 4h, marked as Pd / C. The reaction performance evaluation steps are the same as Example 1, and the catalyst evaluation results are shown in Table 1.

[0051] Comparative Example 2

[0052] Take 0.5 g of TiO2 and 3 mg of platinum nitrate into 25 mL of deionized water, stir at room temperature for 4 h. Then place it in a 80°C water bath for evaporation, and then oven dried at 110°C overnight. Then reduce it with 40 mL / min 99.99% hydrogen at 400°C for 4h, marked as Pt / TiO2. The reaction performance evaluation steps are the same as Example 1, and the catalyst evaluation results are shown in Table 1.

[0053] Comparative Example 3

[0054] Into 25 mL of deionized water, 0.5 g of HBeta molecular sieve and 6 mg of ruthenium acetylacetone were added, and stirred at room temperature for 4 h. Then it was placed in a 80 ℃ water bath and evaporated to dryness, and then dried at 110 ℃ overnight. Then it was reduced with 40 mL / min of 99.99% hydrogen at 400 ℃ for 4 h, and labeled 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] Into a 50 mL beaker, 10.6 g of tetraethyl orthosilicate, 0.4 g of concentrated hydrochloric acid, 50 mg of ruthenium trichloride, and 0.2 g of 3-mercaptopropyltrimethoxysilane were sequentially added, and stirred vigorously at 90 ℃ for 4 h. Then 7.365 g of tetraethylammonium hydroxide and 0.512 g of sodium metaaluminate were added to the above gel, and stirred to disperse uniformly, and then aged at room temperature for 24 h. Then the above gel was transferred to a 50 mL hydrothermal kettle, and placed in a 140 ℃ oven to crystallize for 14 days. Finally, it was centrifuged and washed with water until neutral, and then dried in a 110 ℃ oven for 6 h, and then transferred to a muffle furnace and heated to 550 ℃ at a rate of 5 ℃ / min, and then calcined for 6 h, and then naturally cooled. Then 1.0 g of the above solid was weighed, and dispersed in 50 mL of 1 mol / L NH4Cl aqueous solution, and stirred to disperse uniformly. The mixed solution was stirred at 80 ℃ for 2 h. After cooling to room temperature, it was washed with deionized water for 4-5 times. After drying at 110 ℃ for 6 h, it was reduced with 40 mL / min of 99.99% hydrogen at 400 ℃ for 4 h, and labeled as Ru@Beta-in situ. The reaction performance evaluation steps were 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 application is simple, and the prepared commercial molecular sieve encapsulates a metal catalyst, which is used for hydrogenation of waste plastic materials to prepare liquid fuel or high-value products, and can significantly improve the conversion rate of waste plastic materials, and the selectivity of liquid fuel can be as high as 91%, and the selectivity of high-value products can be as high as 95%.

Claims

1. A method for the efficient hydrogenation of catalytic plastic waste to produce liquid fuels or terephthalic acid, characterized in that: Plastic waste and a catalyst are placed in a mechanically stirred reactor, and then hydrogen is introduced. The reaction of hydrogenating the plastic waste to produce liquid fuel or terephthalic acid is carried out under pressure and temperature. The plastic waste includes polystyrene, polypropylene, polyethylene, and polyethylene terephthalate. The catalyst is a molecular sieve-encapsulated metal catalyst, wherein metal nanoparticles are encapsulated inside the molecular sieve. The catalyst is prepared as follows: the molecular sieve is uniformly dispersed in an aqueous solution of a metal salt, heated, stirred, and refluxed, then centrifuged, washed, dried, and finally reduced with hydrogen. The heating, stirring, and reflux temperature is 100~160℃.

2. The method for efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1, characterized in that: The metal is at least one of Ru, Rh, Pd, Au, Pt, and Ni, with a metal loading of 0.01% to 5%. The molecular sieve is at least one of ZSM-5, MCM-22, Y, USY, Beta, and MCM-41, with a silicon-to-aluminum ratio of 3 to 14.

3. A method for the efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1 or 2, characterized in that: The molecular sieve is of the hydrogen, ammonia, sodium, or potassium form.

4. The method for efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1, characterized in that: The metal salt is a metal chloride, nitrate, carbonyl compound, or acetylacetone compound.

5. The method for efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1, characterized in that: The hydrogen reduction temperature is 250~600℃.

6. The method for efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1, characterized in that: The mass ratio of the plastic waste to the catalyst is 20~100:

1.

7. The method for efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1, characterized in that: The reaction temperature is 260~290℃.

8. The method for efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1, characterized in that: The reaction pressure is 0.1~5 MPa.

9. The method for efficient hydrogenation of catalytic plastic waste to liquid fuel or terephthalic acid as described in claim 1, characterized in that: The reaction time is 0.5 to 5 hours.

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