Preparation of molecular sieve supported metal catalyst and application of molecular sieve supported metal catalyst in preparation of gasoline by coupling conversion of carbon dioxide and high-carbon alkane

Abstract

The invention discloses preparation of a molecular sieve supported metal catalyst and application of the molecular sieve supported metal catalyst in catalyzing coupling of carbon dioxide and high-carbon alkane to prepare high-octane gasoline. The preparation method of the catalyst comprises the following steps: fully drying a Beta molecular sieve, a ZSM-5 molecular sieve and a Y molecular sieve to obtain a catalyst carrier; and then taking metal salt as a precursor, and carrying out equivalent-volume impregnation, drying, roasting and reduction to obtain the heterogeneous catalyst. The series of catalysts show good catalytic activity and selectivity in preparation of high-octane gasoline through coupling conversion of carbon dioxide and high-carbon alkane, gasoline products can be obtained with high yield, the carbon dioxide atmosphere can promote generation of high-octane component aromatic hydrocarbon, and the octane number of gasoline is effectively increased. The catalyst has the advantages of good catalytic performance, simple preparation method, high stability, good selectivity, low cost, strong practicability and reusability, and opens up a new path for preparing high-octane gasoline.

Description

Technical Field

[0001] The invention relates to a molecular sieve-loaded metal catalyst and a preparation method thereof. The catalyst is mainly used for coupling conversion of carbon dioxide and high-carbon alkanes to prepare high-octane gasoline, and belongs to the technical field of composite materials and catalysts. Background Art

[0002] With the rapid development of global industrialization, the demand for fossil fuels such as oil and coal has continued to increase, resulting in a large amount of CO 2 As a greenhouse gas, CO 2 Excessive emissions of CO cause global warming, posing a huge threat to human society. 2 It is an abundant, cheap, and non-toxic C1 resource that can be converted into valuable products through chemical pathways and recycled. 2 With H 2 However, the low production and high price of green hydrogen currently severely limit the development of CO 2 Large-scale application of hydrogenation reaction. Therefore, the development of new CO 2 Coupling transformation strategies is crucial.

[0003] High-carbon alkanes are basic chemicals in petrochemical industry, containing abundant carbon and hydrogen resources, which can be used as CO 2 High-carbon alkanes are widely available, and can be extracted from petroleum products or synthesized through the Fischer-Tropsch reaction. More importantly, renewable biomass and waste plastics can also be used for production. However, their direct economic value is relatively low, and they usually need to be converted into valuable light fuels. Therefore, we prepared metal molecular sieve catalysts for the reaction of high-carbon alkanes and CO 2 Coupled conversion to produce gasoline, in this process, CO 2 Can be reduced to high value-added products such as CO 2 The introduction effectively promoted the increase of aromatic content in the process of alkane conversion and effectively improved the octane number of gasoline. This type of catalyst showed good catalytic performance, and this type of catalyst has not been reported yet. Summary of the invention

[0004] The present invention aims to provide a molecular sieve-supported metal catalyst and a preparation method thereof. The catalyst is low-cost and easy to prepare, and is mainly used for the coupling conversion of high-carbon alkanes and carbon dioxide to prepare high-octane gasoline. The conversion rate of high-carbon alkanes and carbon dioxide is high, the gasoline selectivity is good, the octane number is high, and the catalyst has good stability.

[0005] The molecular sieve-supported metal catalyst of the present invention comprises a molecular sieve and active metal nanoparticles supported on the molecular sieve, wherein the molecular sieve is one of a Beta molecular sieve, a ZSM-5 molecular sieve or a Y molecular sieve, and the SiO 2 / Al 2 O 3 The active metal nanoparticles are one or more of nickel, iron, copper, cobalt, zinc, gallium, silver, rhodium, ruthenium, platinum, magnesium, calcium, strontium, barium, scandium, yttrium, lanthanum and cerium, and the loading amount of the active metal nanoparticles is 1 to 30 wt%.

[0006] The preparation method of the molecular sieve-supported metal catalyst of the present invention adopts an equal volume impregnation method, and the specific steps are as follows: 1) Carrier pretreatment: dry the Beta molecular sieve, ZSM-5 molecular sieve and Y molecular sieve, measure their saturated water absorption rate and set aside; 2) Preparation of impregnation solution: Select any of the above molecular sieves as the carrier, calculate the mass of the required active component precursor according to the measured saturated water absorption rate, and prepare it into an equal volume impregnation solution; 3) Impregnation: Place the carrier in an equal volume of impregnation solution, stir evenly, and impregnate at 10-120℃ for 6-12 hours; 4) Drying and calcination: After impregnation, dry at 100℃ for 8-12 h and calcine in a muffle furnace at 500℃ for 3 h; 5) Activation: The calcined sample is activated in a fixed bed with H 2 The metal catalyst supported by molecular sieve was obtained by reducing the mixed gas of Ar at 500℃ for 0.5~2h.

[0007] In the above step 2), the active component precursor is one or more of nickel salt, iron salt, copper salt, cobalt salt, zinc salt, gallium salt, silver salt, rhodium salt, ruthenium salt, platinum salt, magnesium salt, calcium salt, strontium salt, barium salt, scandium salt, yttrium salt, lanthanum salt or cerium salt. Specifically, it is one or more of nickel nitrate, nickel chloride, iron nitrate, iron chloride, copper nitrate, copper chloride, cobalt nitrate, cobalt chloride, cobalt oxalate, zinc nitrate, zinc chloride, gallium nitrate, silver nitrate, rhodium chloride, rhodium nitrate, ruthenium chloride, chloroplatinic acid, potassium chloroplatinate, acetylacetonate platinum, magnesium nitrate, magnesium chloride, calcium nitrate, strontium nitrate, barium nitrate, scandium nitrate, yttrium nitrate, lanthanum nitrate or cerium nitrate.

[0008] In the above step 3), the stirring and immersion is performed once every 30 minutes.

[0009] In the above step 4), the H 2 H in the mixed gas of Ar 2 The volume concentration is 5~80%.

[0010] Another object of the present invention is to provide an application of the molecular sieve-supported metal catalyst in catalyzing the coupling of carbon dioxide and high-carbon alkanes to prepare high-octane gasoline. The coupling reaction temperature of carbon dioxide and high-carbon alkanes is 200-700°C, the reaction pressure is 0.1-5 MPa, the concentration fraction of carbon dioxide gas is 1-100%, and the carbon number range of high-carbon alkanes is C12-C100.

[0011] The present invention has the following beneficial effects: The present invention uses molecular sieve as a carrier, and metals such as nickel as active sites for carbon dioxide conversion. After reduction, the metal components are uniformly distributed on the surface of the molecular sieve in the form of nanoparticles. In the coupled conversion process of carbon dioxide and high-carbon alkanes, the protonic acid on the molecular sieve catalyzes the cracking, isomerization and aromatization of alkanes. The metal sites can capture carbon dioxide and react with active hydrogen species produced in the alkane conversion process, inhibiting the occurrence of hydrogen transfer paths such as olefin hydrogenation, thereby improving the selectivity of high-octane component aromatics, thereby improving the octane number of gasoline, and carbon dioxide is converted into more active carbon monoxide. In addition, the molecular sieve-supported active metal catalyst provided by the present invention is low in price and easy to prepare, and is used for the coupled conversion of carbon dioxide and high-carbon alkanes to prepare high-octane gasoline. The conversion rate of high-carbon alkanes and carbon dioxide is high, the gasoline selectivity is good, the octane number is high, and the catalyst stability is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The XRD diagrams of the catalysts obtained in Examples 1-4 and Comparative Example 1 of the present invention are shown; Figure 2 The SEM images of the catalysts obtained in Example 1 and Comparative Example 1 of the present invention are shown; Figure 3 TEM image of the catalyst obtained in Example 1 of the present invention; Figure 4 The nitrogen adsorption-desorption curves of the catalysts obtained in Examples 1-4 of the present invention and Comparative Example 1; Figure 5 This is a performance diagram of the recycling of the catalyst obtained in Example 1 of the present invention. DETAILED DESCRIPTION

[0013] The preparation of the molecular sieve-supported metal heterogeneous catalyst of the present invention and its catalytic performance in the reaction of coupling conversion of carbon dioxide and high-carbon alkanes to prepare high-octane gasoline are further described below through specific examples.

[0014] Example 1 Weigh 1.493 g of nickel nitrate hexahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3= 25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven to dry for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and roast it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, pass 10%H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 20Ni / Beta catalyst, which was recorded as C-1.

[0015] Example 2 Weigh 0.373 g of nickel nitrate hexahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 =25), stir evenly and let stand, stir once every 30 minutes, and place in a 100 ℃ oven to dry for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500 ℃ muffle furnace and roast it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, pass 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 5Ni / Beta catalyst, which was recorded as C-2.

[0016] Example 3 Weigh 0.747 g of nickel nitrate hexahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 = 25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven to dry for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and roast it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, pass 10%H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 10Ni / Beta catalyst, which was recorded as C-3.

[0017] Example 4 Weigh 2.240 g of nickel nitrate hexahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 =25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and bake it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, and pass 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 30Ni / Beta catalyst, which was recorded as C-4.

[0018] Example 5 Weigh 1.493 g of nickel nitrate hexahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 = 60), stirred evenly and then allowed to stand, stirred every 30 min, and placed in a 100℃ oven for 12 h after 8 h. The dried sample was placed in a porcelain boat, then placed in a 500℃ muffle furnace and calcined in air for 3 h; after cooling, 0.5 g of the sample was placed in a fixed bed reaction tube and passed through 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 20Ni / Beta-60 catalyst, which was recorded as C-5.

[0019] Example 6 Weigh 1.493 g of nickel nitrate hexahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 =150), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven to dry for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and roast it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, and pass 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 20Ni / Beta-150 catalyst, which was recorded as C-6.

[0020] Example 7 Weigh 1.085 g of ferric nitrate nonahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieves (SiO 2 / Al 2 O 3 =25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and bake it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, and pass 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 10Fe / Beta catalyst, which was recorded as C-7.

[0021] Example 8 Weigh 0.741 g of cobalt nitrate hexahydrate and dissolve it in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieves (SiO 2 / Al 2 O 3 =25), stirred evenly and then allowed to stand, stirred every 30 min, and placed in a 100 ℃ oven for 12 h after 8 h. The dried sample was placed in a porcelain boat, then placed in a 500 ℃ muffle furnace and calcined in air for 3 h; after cooling, 0.5 g of the sample was taken and loaded into a fixed bed reaction tube, and 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 10Co / Beta catalyst, which was recorded as C-8.

[0022] Example 9 Weigh 1.493 g nickel nitrate hexahydrate and 0.316 g magnesium nitrate hexahydrate and dissolve them in 3 mL water. Then add 1.5 g fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 =25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven to dry for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and roast it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, and pass 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 20Ni-2Mg / Beta catalyst, which was recorded as C-9.

[0023] Example 10 Weigh 1.493 g of nickel nitrate hexahydrate and 0.093 g of cerium nitrate hexahydrate and dissolve them in 3 mL of water. Then add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 = 25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven to dry for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and roast it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, and pass 10% H 2 / Ar mixed gas was reduced at 500℃ for 2 h to obtain 20Ni-2Ce / Beta catalyst, which was recorded as C-10.

[0024] Embodiment 11 Weigh 0.747 g of nickel nitrate hexahydrate and dissolve it in 2 mL of water, then add 1.5 g of fully dried ZSM-5 molecular sieve (SiO 2 / Al 2 O 3=25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven to dry for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and roast it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, pass 10%H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain 10Ni / ZSM-5 catalyst, which was recorded as C-11.

[0025] Comparative Example 1 Measure 2 mL of water and add 1.5 g of fully dried Beta molecular sieve (SiO 2 / Al 2 O 3 =25), stir evenly and let stand, stir once every 30 minutes, and place in a 100℃ oven for 12 hours after 8 hours. Put the dried sample into a porcelain boat, and then place it in a 500℃ muffle furnace and bake it in air for 3 hours; after cooling, take 0.5g of the sample and put it into a fixed bed reaction tube, and pass 10% H 2 / Ar mixed gas was reduced at 500℃ for 2h to obtain Beta catalyst, which was recorded as C-12.

[0026] Product structure characterization and performance evaluation Structural characterization: The catalysts obtained in Examples 1 to 4 and Comparative Example 1 were characterized by XRD. Figure 1 The XRD patterns of each sample show the unique diffraction peaks of Beta molecular sieve, and the diffraction peaks of metal nickel appear after loading, indicating that the structure of the carrier can remain stable during the preparation process, and the metal exists in the form of nanoparticles after loading.

[0027] The catalysts obtained in Example 1 and Comparative Example 1 were characterized by SEM. Figure 2 As shown in Figure 2, there is no obvious change in the structure of the catalyst before (a) and after (b) Beta zeolite loading, indicating that the structure of the zeolite can remain stable during the catalyst preparation process.

[0028] The catalyst obtained in Example 1 was characterized by TEM. Figure 3 As shown in Figure 2, nickel nanoparticles are evenly dispersed on the surface of the catalyst, and the particle size is mainly concentrated in the range of 30-80 nm.

[0029] The catalysts obtained in Examples 1 to 4 and Comparative Example 1 were characterized by nitrogen adsorption and desorption. The results are as follows: Figure 4 The nitrogen adsorption-desorption curves of each sample show the microporous structure of Beta molecular sieve, indicating that the pore structure of the catalyst is still maintained before and after loading.

[0030] Performance evaluation: The catalysts prepared in Examples 1 to 11 and Comparative Example 1 were used in the reaction of coupling conversion of carbon dioxide and high carbon alkanes to prepare gasoline, so as to illustrate the catalytic performance of different catalysts in catalyzing the coupling conversion of carbon dioxide and high carbon alkanes.

[0031] 0.1 g of catalyst, 5 g of n-hexadecane, and 1 MPa of carbon dioxide gas were added to the autoclave, and the temperature was raised to 270 °C for reaction. The reaction time was 12 h. After the reaction, the gas and liquid products were collected, and the components of the gas and liquid products were analyzed using Agilent GC-8860 and Agilent GC-7890A, respectively. The product composition was analyzed using the correction factor method to obtain the content of each component in the product and calculate the conversion rate and selectivity. The reaction data of different catalysts are shown in Table 1.

[0032] Table 1 Results of the catalysts prepared in Examples 1 to 11 and Comparative Example 1 in the reaction of coupling conversion of carbon dioxide and high carbon alkanes to produce gasoline It can be seen from Table 1 that the catalyst prepared by the present invention has high catalytic activity and selectivity in catalyzing the coupling conversion of carbon dioxide and high-carbon alkanes to produce gasoline.

[0033] Taking catalyst C-1 (20Ni / Beta) as an example, the performance of this series of catalysts in the coupling conversion of carbon dioxide and high-carbon alkanes to produce gasoline is illustrated.

[0034] Reaction conditions: Add 0.1 g catalyst, 5 g n-hexadecane, and introduce 1 MPa carbon dioxide gas into the autoclave, seal it, and react at 270 ° C for 12 h. After the reaction, collect the gas and liquid products, use Agilent GC-8860 and Agilent GC-7890A to analyze the components of the gas and liquid products, respectively, and use the correction factor method to analyze the product composition, obtain the content of each component in the product, and calculate the conversion rate and selectivity. After the reaction, centrifuge the catalyst, wash it 3 times with 50 mL of ether, dry it at 100 ° C for 12 h, place it in a 500 ° C muffle furnace, roast it under air conditions for 3 h, and then 10% H 2 The catalyst was regenerated by reducing the mixture of Ar and Ar at 500 °C for 2 h, and then reloaded into the autoclave for another reaction. The data on the reuse of the catalyst can be found in Figure 5 .

[0035] Depend on Figure 5 It can be seen that the catalyst prepared by the present invention can be reused, and during the repeated use, it still has the catalytic activity equivalent to that when it was initially used.

[0036] Taking catalyst C-1 (20Ni / Beta) as an example, it is shown that compared with nitrogen atmosphere, this series of catalysts can effectively improve the octane number of gasoline in the reaction atmosphere of carbon dioxide.

[0037] Add 0.1g catalyst and 5g n-hexadecane to the autoclave, fill with 1MPa nitrogen gas, heat to 270℃ for reaction, and the reaction time is 12h. After the reaction, collect gas and liquid products, use Agilent GC-8860 and Agilent GC-7890A to analyze the gas and liquid products respectively, and use the correction factor method to analyze the product composition to obtain the content of each component in the product. The composition of each component in gasoline under different atmospheres is shown in Table 2.

[0038] Table 2 The components of gasoline produced by the catalyst prepared in Example 1 under carbon dioxide and nitrogen atmosphere It can be seen from Table 2 that the catalyst prepared by the present invention has higher aromatics selectivity under the atmosphere of carbon dioxide. Since the aromatic components have a high octane number, the gasoline produced by the catalyst under the atmosphere of carbon dioxide has a higher octane number, which proves the excellence of the carbon dioxide and high-carbon alkane coupling conversion strategy in preparing high-octane gasoline, and the high efficiency of the catalyst prepared by the present invention in catalyzing the coupling of carbon dioxide and high-carbon alkanes to prepare high-octane gasoline.

[0039] In summary, it is shown that the molecular sieve-supported active metal series catalyst prepared by the present invention exhibits good catalytic activity and selectivity in the preparation of high-octane gasoline by coupling conversion of carbon dioxide and high-carbon alkanes, and can obtain gasoline products at a high yield, and the carbon dioxide atmosphere can promote the formation of high-octane component aromatics, effectively improving the octane number of gasoline. At the same time, the catalyst has the advantages of good catalytic performance, simple preparation method, high stability, good selectivity, low cost, strong practicality, and reusability, opening up a new path for the preparation of high-octane gasoline, and providing a reliable industrial catalytic system for the preparation of high-octane gasoline by coupling conversion of carbon dioxide and high-carbon alkanes.

Claims

1. A molecular sieve-supported metal catalyst, It is characterized in that The invention comprises a molecular sieve and active metal nanoparticles loaded on the molecular sieve, wherein the molecular sieve is one of Beta molecular sieve, ZSM-5 molecular sieve or Y molecular sieve, and the SiO 2 / Al 2 O 3 The active metal nanoparticles are one or more of nickel, iron, copper, cobalt, zinc, gallium, silver, rhodium, ruthenium, platinum, magnesium, calcium, strontium, barium, scandium, yttrium, lanthanum and cerium, and the loading amount of the active metal nanoparticles is 1 to 30 wt%.

2. A method for preparing the molecular sieve-supported metal catalyst as claimed in claim 1, It is characterized in that The equal volume impregnation method is adopted, and the specific steps are as follows: 1) Carrier pretreatment: dry the Beta molecular sieve, ZSM-5 molecular sieve and Y molecular sieve, measure their saturated water absorption rate and set aside; 2) Preparation of impregnation solution: Select any of the above molecular sieves as the carrier, calculate the mass of the required active component precursor according to the measured saturated water absorption rate, and prepare it into an equal volume impregnation solution; 3) Impregnation: Place the carrier in an equal volume of impregnation solution, stir evenly, and impregnate at 10-120℃ for 6-12 hours; 4) Drying and calcination: After impregnation, dry at 100℃ for 8-12 h and calcine in a muffle furnace at 500℃ for 3 h; 5) Activation: The calcined sample is activated in a fixed bed with H 2 The metal catalyst supported by molecular sieve was obtained by reducing the mixed gas of Ar at 500℃ for 0.5~2h.

3. A method for preparing a molecular sieve-supported metal catalyst as claimed in claim 2, It is characterized in that In step 2), the active component precursor is one or more of nickel salt, iron salt, copper salt, cobalt salt, zinc salt, gallium salt, silver salt, rhodium salt, ruthenium salt, platinum salt, magnesium salt, calcium salt, strontium salt, barium salt, scandium salt, yttrium salt, lanthanum salt or cerium salt.

4. A method for preparing a molecular sieve-supported metal catalyst as claimed in claim 3, It is characterized in that In step 2), the active component precursor is one or more of nickel nitrate, nickel chloride, ferric nitrate, ferric chloride, copper nitrate, copper chloride, cobalt nitrate, cobalt chloride, cobalt oxalate, zinc nitrate, zinc chloride, gallium nitrate, silver nitrate, rhodium chloride, rhodium nitrate, ruthenium chloride, chloroplatinic acid, potassium chloroplatinate, platinum acetylacetonate, magnesium nitrate, magnesium chloride, calcium nitrate, strontium nitrate, barium nitrate, scandium nitrate, yttrium nitrate, lanthanum nitrate or cerium nitrate.

5. A method for preparing a molecular sieve-supported metal catalyst as claimed in claim 2, It is characterized in that In step 3), the stirring and dipping is performed once every 30 minutes.

6. A method for preparing a molecular sieve-supported metal catalyst as claimed in claim 2, It is characterized in that In step 4), the H 2 H in the mixed gas of Ar 2 The volume concentration is 5~80%.

7. Use of the molecular sieve-supported metal catalyst as claimed in claim 1 in catalyzing the coupling of carbon dioxide and high-carbon alkanes to prepare high-octane gasoline.

8. Use of the molecular sieve-supported metal catalyst as claimed in claim 7 in catalyzing the coupling of carbon dioxide and high carbon alkanes to prepare high octane gasoline, It is characterized in that The coupling reaction temperature of carbon dioxide and high-carbon alkanes is 200~700℃, the reaction pressure is 0.1~5 MPa, the concentration fraction of carbon dioxide gas is 1~100%, and the carbon number range of high-carbon alkanes is C12~C100.

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