Preparation method of catalyst carrier, catalyst containing carrier and application of catalyst

Abstract

The invention relates to a preparation method of a catalyst carrier, a catalyst containing the carrier and application of the carrier, and the preparation method of the catalyst carrier comprises the following steps: treating a carrier composition through a molding process to obtain a molded carrier; the formed carrier is subjected to roasting treatment, and the catalyst carrier is prepared; wherein the carrier composition comprises a molecular sieve, an adhesive and a pore-enlarging agent, and the pore-enlarging agent comprises Fischer-Tropsch wax. According to the preparation method of the catalyst carrier, the Fischer-Tropsch wax is used as a pore-enlarging agent, so that the formation of a stepped pore channel structure in the carrier is facilitated, and the corresponding catalyst is particularly suitable for isomerization catalytic reaction.

Description

Technical Field

[0001] The present invention relates to a catalyst, in particular to a catalyst for isomerization reaction. Background Art

[0002] Fixed bed hydrogenation catalysts usually need to provide sufficient diffusion channels for reactants and products to pass through. In order to ensure the stable operation of the catalyst (such as residual oil hydrogenation catalyst, demetallization protective agent, etc.) and to ensure that its lifespan meets the requirements, high requirements are often placed on the catalyst's stepped channels. This is because the residual oil has a large molecular weight and requires more favorable diffusion channels, while the demetallization protective agent requires larger channels and pore volumes to ensure the metal accommodation effect.

[0003] Fischer-Tropsch wax is mainly composed of straight-chain hydrocarbons with a carbon number range of up to C 10 ~C 100 , there are problems of high wax content (greater than 95%) and high freezing point (60-100°C). To convert Fischer-Tropsch wax into oil products, hydrocracking or hydroisomerization is usually required. However, due to the long carbon chain of the Fischer-Tropsch wax raw material and the difficulty of isomerization decondensation, the isomerization performance requirements of the catalyst are very high. The conventional isomerization catalyst obtained by direct extrusion molding, impregnation and other steps of isomerized molecular sieves and binders has underdeveloped pores, which easily makes it difficult to desorb the Fischer-Tropsch wax raw material and isomerized products, affecting the yield of isomerized products.

[0004] The existing technology introduces pore expanders during the carrier forming stage to make the pore structure of the catalyst richer, the pore diameter and pore volume larger, so as to improve the diffusion problem of raw materials and products in the catalyst. However, the commonly used pore expanders need to be removed by calcining the carrier. On the one hand, calcination will release a large amount of CO2, and on the other hand, the combustion process of the pore expander will release a large amount of heat, which may affect the performance of the catalyst. Summary of the invention

[0005] In order to overcome at least one defect of the above-mentioned prior art, in a first aspect, an embodiment of the present invention provides a method for preparing a catalyst carrier, comprising the following steps:

[0006] Treating the carrier composition through a molding process to obtain a molded carrier;

[0007] calcining the shaped carrier to obtain the catalyst carrier;

[0008] The carrier composition comprises a molecular sieve, a binder and a pore expanding agent, and the pore expanding agent comprises Fischer-Tropsch wax.

[0009] In a second aspect, an embodiment of the present invention provides the use of Fischer-Tropsch wax as a pore-enlarging agent in the preparation of a catalyst carrier.

[0010] In a third aspect, an embodiment of the present invention provides a catalyst, comprising a catalyst carrier prepared by the above method and a metal active component supported on the catalyst carrier.

[0011] In a fourth aspect, an embodiment of the present invention provides a use of the above-mentioned catalyst in an isomerization reaction.

[0012] A method for preparing a catalyst carrier according to an embodiment of the present invention uses Fischer-Tropsch wax as a pore-enlarging agent, which is beneficial to the formation of a stepped pore structure in the carrier, making the corresponding catalyst particularly suitable for isomeric catalytic reactions. DETAILED DESCRIPTION

[0013] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions therein are essentially used as illustrations rather than to limit the present invention.

[0014] One embodiment of the present invention provides a method for preparing a catalyst carrier, comprising the following steps:

[0015] Treating the carrier composition through a molding process to obtain a molded carrier;

[0016] The shaped carrier is calcined to obtain a catalyst carrier;

[0017] The carrier composition includes molecular sieve, adhesive and pore expander, and the pore expander includes Fischer-Tropsch wax.

[0018] In one embodiment, the prepared catalyst carrier is composed of a binder and a molecular sieve, and the Fischer-Tropsch wax combination serves as a pore-enlarging agent to play a supporting role during the carrier molding process and will be removed after molding.

[0019] A catalyst carrier according to one embodiment of the present invention, by adding Fischer-Tropsch wax as a pore expanding agent during the preparation process, is beneficial to the formation of a pore structure, so that the subsequently prepared catalyst has a rich pore structure, thereby being able to provide diffusion channels for reactants and products during the reaction process, making the reaction more complete.

[0020] In one embodiment, the pore expander can be Fischer-Tropsch wax powder, and the addition of the Fischer-Tropsch wax pore expander can form a stepped pore structure in the final catalyst carrier. Specifically, using Fischer-Tropsch wax as a pore expander can form two types of pores, mesopores and macropores, in the catalyst. The presence of the two types of pores makes the pores overall present a stepped (or gradient) distribution.

[0021] In one embodiment, the pore expander includes one or more of 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax, and 100# Fischer-Tropsch wax. Furthermore, the pore expander can be a single Fischer-Tropsch wax component, such as 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax, or 100# Fischer-Tropsch wax; or it can be a combination of multiple components, such as a mixture of 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax, and 100# Fischer-Tropsch wax. Among them, 45# Fischer-Tropsch wax refers to a Fischer-Tropsch wax with a drop melting point in the range of 40 to 50°C, 60# Fischer-Tropsch wax refers to a Fischer-Tropsch wax with a drop melting point in the range of 50 to 70°C, and 100# Fischer-Tropsch wax refers to a Fischer-Tropsch wax with a drop melting point in the range of 90 to 110°C.

[0022] In one embodiment, during the carrier forming process, low melting point Fischer-Tropsch wax (e.g., 45#, 60#) will undergo a certain degree of ductility and deformation under the extrusion of molecular sieve particles. After removing the Fischer-Tropsch wax, three-dimensional connected channels can be obtained, which are conducive to the diffusion of the reaction materials and can allow the catalyst to maintain a high mechanical strength. 100# Fischer-Tropsch wax tends to maintain its original shape due to its high hardness. After removing the Fischer-Tropsch wax, a larger point-distributed hole structure will be formed on the carrier, which can form a gradient channel structure with the aforementioned connected channels.

[0023] In one embodiment, the pore expanding agent includes 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax and 100# Fischer-Tropsch wax, and the mass ratio of the three is: 45# Fischer-Tropsch wax: 60# Fischer-Tropsch wax: 100# Fischer-Tropsch wax = (0.5-2.0): (1.0-5.0): 1, for example, 0.8: (1.0-5.0): 1, 1.0: (1.0-5.0): 1, 1.2: (1.0-5.0): 1, 1.5: (1.0-5.0): 1, 1.8: (1.0-5.0): 1, (0.5-2.0): 1.2: 1, (0.5-2.0): 2.0: 1, (0.5-2.0): 3.0: 1, (0.5-2.0): 4.0: 1, (0.5-2.0): 4.8: 1.

[0024] In one embodiment, the molecular sieve of the carrier composition is an isomerized molecular sieve (or isomerized molecular sieve) with isomerization function, for example, it can be one or more of SAPO-11 molecular sieve, SAPO-41 molecular sieve, ZSM-22 molecular sieve, ZSM-23 molecular sieve, ZSM-48 molecular sieve, SSZ-32 molecular sieve. In the present invention, the mass of the molecular sieve is measured by the mass of the molecular sieve dry basis.

[0025] In one embodiment, the binder comprises alumina and / or silica, for example the binder may be pseudo-boehmite.

[0026] In one embodiment, calculated on a dry basis, the mass ratio of the binder to the molecular sieve is (0.2-0.5):(0.5-0.8), for example, 0.3:(0.5-0.8), 0.4:(0.5-0.8), (0.2-0.5):0.6, (0.2-0.5):0.7.

[0027] In one embodiment, the binder is pseudo-boehmite, wherein the mass ratio of alumina to molecular sieve is (0.2-0.5):(0.5-0.8).

[0028] In one embodiment, the mass ratio of the pore expanding agent to the carrier dry basis is (0.1-0.5):1, for example, 0.2:1, 0.3:1, 0.4:1.

[0029] In one embodiment, the mass ratio of the molecular sieve, the dry basis of the binder (such as alumina), and the pore expanding agent may be 0.7:0.3:(0.1-0.5).

[0030] In one embodiment, the carrier composition can be kneaded and extruded under the action of acid solution, and then dried to obtain a shaped carrier.

[0031] In one embodiment, the acid solution may be a nitric acid solution, and the mass ratio of nitric acid in the nitric acid solution to the carrier dry basis is (0.01-0.05):1, such as 0.02:1, 0.03:1, 0.04:1. The concentration of the nitric acid solution may be 1-10 wt%.

[0032] In one embodiment, the temperature of the drying process during the formation of the shaped carrier can be 80-150°C, for example, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C.

[0033] In one embodiment, the calcination temperature may be 500-600°C, for example 550°C.

[0034] In one embodiment, the pore expander Fischer-Tropsch wax in the molded carrier can be removed by solvent oil, and then calcined. Among them, the existing pore expander is removed during the calcination process. Removing the pore expander by calcination will release a large amount of CO2, and the combustion of the pore expander will release heat, affecting the performance of the catalyst. The use of solvent oil to dissolve and remove the Fischer-Tropsch wax can not only avoid the effect of heat release on the catalyst performance, but also reduce the emission of carbon dioxide during the calcination process.

[0035] In one embodiment, the solvent oil can be one or more hydrocarbons containing 5 to 16 carbon atoms; further, it can be an alkane or olefin (such as a monoolefin) containing 5 to 16 carbon atoms; wherein the alkane can be a chain alkane, such as a straight chain alkane or an alkane with a branched chain, or a cycloalkane. The solvent oil can be, for example, one or more of petroleum ether, n-hexane, cyclohexane, and methylcyclohexane.

[0036] In one embodiment, the number of carbon atoms contained in the hydrocarbons of the mineral spirits may be 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15.

[0037] In one embodiment, the molding carrier can be washed with solvent oil to dissolve the Fischer-Tropsch wax in the solvent oil for removal. For example, the dried molding carrier can be leached with solvent oil to dissolve the Fischer-Tropsch wax in the solvent oil; thereafter, the molding carrier can be purged with compressed air to remove the residual solvent oil.

[0038] In one embodiment, the wax-containing solvent oil can be processed by cyclone separation, the solid wax powder is recovered from the bottom of the cyclone separator, and the gaseous solvent is separated from the top and recovered after cooling; the solvent oil attached to the molding carrier can be removed by drying and recovered by cooling, and the solvent and wax powder can be recycled separately.

[0039] In one embodiment, the method for preparing a catalyst support comprises:

[0040] Mixing a powdered Fischer-Tropsch wax pore-enlarging agent, a molecular sieve and a binder in a certain proportion to obtain a mixture;

[0041] A nitric acid solution is added to the mixture for kneading, followed by extrusion into a strip shape, and drying to obtain a shaped carrier;

[0042] The molded carrier is washed with solvent oil to remove the Fischer-Tropsch wax component in the carrier, and then dried and finally calcined to obtain the catalyst carrier.

[0043] One embodiment of the present invention provides the use of Fischer-Tropsch wax as a pore-enlarging agent in the preparation of a catalyst carrier.

[0044] One embodiment of the present invention provides a catalyst carrier, which is prepared by the above method.

[0045] One embodiment of the present invention provides a catalyst, including the above-mentioned catalyst carrier and a metal active component supported on the catalyst carrier.

[0046] In one embodiment, the metal active component may be one or more of Ni, Pt, and Pd.

[0047] In one embodiment, the mass ratio of the metal active component to the carrier may be (0.003-0.006):1.

[0048] One embodiment of the present invention provides a method for preparing a catalyst, comprising the following steps:

[0049] Using the above method to prepare a catalyst carrier; and

[0050] The catalyst carrier is impregnated in an impregnation solution containing metal active component elements, and then dried and calcined to obtain a catalyst.

[0051] The catalyst according to one embodiment of the present invention is a porous catalyst suitable for hydroisomerization reaction.

[0052] One embodiment of the present invention provides the use of the above catalyst in an isomerization reaction. For example, the isomerization reaction may be the isomerization of n-hexadecane, the isomerization of Fischer-Tropsch wax, or the isomerization of chain hydrocarbons in petroleum feedstocks.

[0053] The catalyst of one embodiment of the present invention has a plurality of pore structures with gradient changes, which is conducive to the diffusion of isomerized products from the catalytic medium, thereby avoiding cracking reactions.

[0054] A method for preparing a catalyst carrier according to one embodiment of the present invention uses Fischer-Tropsch wax as a pore expanding agent, which not only can obtain a catalyst carrier with multiple stepped pores that meet diffusion requirements, but the Fischer-Tropsch wax can also be removed by solvent, thus avoiding the problems of demolding exotherm and CO2 emissions caused by the need for conventional pore expanding agents to be removed by calcination.

[0055] A catalyst of one embodiment of the present invention has a rich pore structure. Fischer-Tropsch wax is used as a pore expanding agent during the preparation process. By controlling the ratio of Fischer-Tropsch waxes with different melting points, the ductility of light Fischer-Tropsch wax is utilized to form interconnected pores with smaller pore sizes on the catalyst, and the high hardness and non-deformation properties of heavy Fischer-Tropsch wax particles are utilized to form pores with larger pore sizes. The two types of pores are matched with each other so that the pore sizes are distributed in a step-by-step manner and can be adjusted, thereby providing diffusion channels for reactants and products and making the reaction more complete.

[0056] The catalyst of one embodiment of the present invention is further described below in conjunction with the examples. Unless otherwise specified, the raw materials used are all commercially available. The pore size is measured by conventional BET analysis method and mercury intrusion method, and the catalyst strength test is measured using a lateral pressure strength instrument.

[0057] Example 1

[0058] (1) On a dry basis, three powders having a mass ratio of molecular sieve ZSM-48:alumina:pore expander = 0.7:0.3:0.25 are mixed evenly; wherein the pore expander is a mixture of 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax and 100# Fischer-Tropsch wax, and the mass ratio of the three is 45# wax:60# wax:100# wax = 1.25:3:1.

[0059] (2) adding a dilute nitric acid solution to the mixed powder to make the mixture gluing into a mass; then extruding into strips, and drying at 120° C. to obtain a shaped carrier; wherein the dilute nitric acid solution: carrier dry basis = 0.6:1, nitric acid: carrier dry basis = 0.025:1, the concentration of the dilute nitric acid solution is 4.17%, and the above ratios are mass ratios.

[0060] (3) washing the molded carrier with n-hexane solvent to extract the Fischer-Tropsch wax, and then blowing the carrier with compressed air to remove the residual solvent; then, calcining the molded carrier at 550° C. to obtain a catalyst carrier.

[0061] (4) impregnating the catalyst carrier with an aqueous solution of tetraammineplatinum dichloride, which is an impregnation solution containing the Pt element; wherein the mass ratio of the Pt element to the catalyst carrier is 0.0035:1; then, drying the catalyst carrier at 120° C. and calcining at 500° C. to obtain a catalyst.

[0062] Example 1-1

[0063] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=0.5:1:1.

[0064] Example 1-2

[0065] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=0.5:3:1.

[0066] Examples 1-3

[0067] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=0.5:5:1.

[0068] Examples 1-4

[0069] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=1.2:1:1.

[0070] Examples 1-5

[0071] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=1.2:5:1.

[0072] Examples 1-6

[0073] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=2:1:1.

[0074] Examples 1-7

[0075] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=2:3:1.

[0076] Examples 1-8

[0077] This embodiment uses substantially the same raw materials and process as in Embodiment 1 to prepare the catalyst, with the only difference being that the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax=2:5:1.

[0078] Example 2

[0079] This embodiment uses basically the same raw materials and process as embodiment 1 to prepare the catalyst, the only difference is that the mass ratio of molecular sieve to alumina and pore expander is 0.7:0.3:0.1, and the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax = 0.5:5:1.

[0080] Example 3

[0081] This embodiment uses basically the same raw materials and process as embodiment 1 to prepare the catalyst, the only difference is that the mass ratio of molecular sieve to alumina and pore expander is 0.7:0.3:0.5, and the mass ratio of the three Fischer-Tropsch waxes is 45# wax:60# wax:100# wax = 2:1:1.

[0082] Example 4

[0083] This example uses substantially the same raw materials and process as Example 1 to prepare the catalyst, with the only difference being that the pore-enlarging agent added in step (1) is only 60# Fischer-Tropsch wax.

[0084] Example 5

[0085] This example uses substantially the same raw materials and process as Example 1 to prepare the catalyst, with the only difference being that the pore-enlarging agent added in step (1) is only 45# Fischer-Tropsch wax.

[0086] Example 6

[0087] This example uses substantially the same raw materials and process as Example 1 to prepare the catalyst, with the only difference being that the pore-enlarging agent added in step (1) is only 100# Fischer-Tropsch wax.

[0088] Example 7

[0089] This example uses substantially the same raw materials and process as Example 1 to prepare the catalyst, with the only difference being that the pore-enlarging agent added in step (1) is only 70# Fischer-Tropsch wax.

[0090] Comparative Example 1

[0091] This example uses the same raw materials and process as Example 1 to prepare the catalyst, with the only difference being that no pore-enlarging agent is added in step (1), and the process of removing the residual solvent in step (3) is not performed, and the calcination treatment in step (3) is directly used.

[0092] Comparative Example 2

[0093] This example uses substantially the same raw materials and processes as Example 1 to prepare the catalyst, with the only difference being that the pore-enlarging agent added in step (1) is polyethylene glycol, and the process of removing the residual solvent in step (3) is not performed, and the calcination treatment in step (3) is directly used.

[0094] Comparative Example 3

[0095] This example uses substantially the same raw materials and process as Example 1 to prepare the catalyst, with the only difference being that the pore-enlarging agent added in step (1) is hydroxymethyl cellulose, and the process of removing the residual solvent in step (3) is not performed, and the calcination treatment in step (3) is directly used.

[0096] Using n-hexadecane as raw material, at a hydrogen partial pressure of 1 MPa and a space velocity of 2.0 h -1 The isomerization performance of the catalyst prepared above was evaluated under the test conditions of 500:1 hydrogen-oil volume ratio and 250-320°C reaction temperature. The relevant performance data are shown in Table 1. The total product of the isomerization reaction consists of three parts: cracked product, isomerized hexadecane and normal hexadecane residue; conversion rate = ((cracked product + isomerized hexadecane) / total product amount) × 100%, isomerization selectivity = (isomerized hexadecane / (cracked product + isomerized hexadecane)) × 100%.

[0097] Table 1

[0098]

[0099]

[0100] According to the above description, in Comparative Example 1, no pore expanding agent is added, and only a certain mesoporous (i.e., mesoporous) structure can be formed by relying on the structure of alumina itself. From the data in Table 1, it can be seen that its pore size is small and a macroporous structure cannot be formed. Comparative Example 2 uses polyethylene glycol as a pore expanding agent to form a certain macroporous structure, but the pore size is small. Comparative Example 3 uses hydroxymethyl cellulose as a pore expanding agent, and the mesopore diameter becomes larger, but there is no macroporous structure. According to Table 1, the catalysts of Comparative Examples 1 to 3 have no macropores or a structure with small macropore diameters, which makes the isomerization selectivity of the reaction low, and none of them exceeds 90%.

[0101] In Examples 4 to 7, 60#, 45#, 100#, and 70# Fischer-Tropsch waxes are used as pore-enlarging agents, respectively, and the prepared catalysts include mesopores and macropores, and the pore diameters of the macropores are larger than those of Comparative Example 2, so that the isomerization selectivity of the reaction is improved compared with Comparative Examples 1 to 3. Therefore, in the embodiments of the present invention, by using Fischer-Tropsch wax as a pore-enlarging agent to prepare the catalyst, the isomerization reaction can have a higher isomerization selectivity on the basis of a higher conversion rate.

[0102] In Examples 1 to 3, a combination of 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax, and 100# Fischer-Tropsch wax is used as a pore expander. The pore size of the catalyst obtained is further improved as a whole compared with Examples 4 to 7, and the mesopores and macropores are matched, so that the catalyst has better paraffin isomerization performance while maintaining a higher catalyst strength. Therefore, the pore expander of the carrier composition of one embodiment of the present invention is preferably a combination of 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax, and 100# Fischer-Tropsch wax, and the mass ratio of the three can be (0.5-2.0):(1.0-5.0):1.

[0103] The difference between Examples 1 to 1-8 is that the mass ratios of the three Fischer-Tropsch waxes are different. As shown in Table 1, the catalyst strength and isomerization selectivity of Examples 1, 1-2, and 1-7 are generally better than those of other examples in Examples 1 to 1-8. Therefore, the mass ratio of 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax, and 100# Fischer-Tropsch wax in the pore expander of one embodiment of the present invention is preferably (0.5-2.0):3:1.

[0104] Unless otherwise defined, the terms used in the present invention have the meanings commonly understood by those skilled in the art.

[0105] The embodiments described in the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various other substitutions, changes and improvements within the scope of the present invention. Therefore, the present invention is not limited to the above embodiments, but is only limited by the claims.

Claims

1. A method for preparing a catalyst carrier, comprising the following steps: Treating the carrier composition through a molding process to obtain a molded carrier; calcining the shaped carrier to obtain the catalyst carrier; in, The carrier composition comprises a molecular sieve, a binder and a pore-enlarging agent, wherein the pore-enlarging agent comprises a Fischer-Tropsch wax.

2. The preparation method according to claim 1, wherein The pore expanding agent in the molding carrier is removed by solvent oil, and then the calcination treatment is performed.

3. The preparation method according to claim 2, wherein The solvent oil includes one or more hydrocarbons containing 5 to 16 carbon atoms; further, the solvent oil includes one or more paraffins and cycloalkanes containing 5 to 16 carbon atoms; further, the solvent oil includes one or more petroleum ether, n-hexane, cyclohexane, and methylcyclohexane; and / or, The molding carrier is washed with the solvent oil to remove the pore expanding agent.

4. The preparation method according to claim 1, wherein The pore expanding agent includes one or more of 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax, and 100# Fischer-Tropsch wax; and / or, The binder comprises aluminum oxide and / or silicon oxide; and / or, The molecular sieve is an isomerized molecular sieve with isomerization function.

5. The preparation method according to claim 4, wherein: The pore expanding agent includes 45# Fischer-Tropsch wax, 60# Fischer-Tropsch wax and 100# Fischer-Tropsch wax, and the mass ratio of the three is: 45# Fischer-Tropsch wax: 60# Fischer-Tropsch wax: 100# Fischer-Tropsch wax = (0.5-2.0): (1.0-5.0): 1; and / or, On a dry basis, the mass ratio of the binder to the molecular sieve is (0.2-0.5):(0.5-0.8); and / or, The molecular sieve includes one or more of SAPO-11 molecular sieve, SAPO-41 molecular sieve, ZSM-22 molecular sieve, ZSM-23 molecular sieve, ZSM-48 molecular sieve, and SSZ-32 molecular sieve.

6. The preparation method according to claim 1, wherein The mass ratio of the dry basis of the molecular sieve, the dry basis of the binder, and the pore-enlarging agent is 0.7:0.3:(0.1-0.5); and / or, The carrier composition is kneaded and extruded under the action of acid solution, and then dried to obtain the shaped carrier.

7. The preparation method according to claim 6, wherein: The drying temperature is 80-150° C.; and / or, The calcination temperature is 500-600°C.

8. Application of Fischer-Tropsch wax as a pore-enlarging agent in the preparation of catalyst carriers.

9. A catalyst comprising a catalyst carrier prepared by the preparation method according to any one of claims 1 to 7 and a metal active component supported on the catalyst carrier.

10. Use of the catalyst according to claim 9 in an isomerization reaction.

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