Continuous-reforming catalyst and preparation method therefor

Abstract

Provided in the present invention are a continuous-reforming catalyst and a preparation method therefor, belonging to the technical field of catalyst preparation. The method comprises: performing hydrothermal crystallization on a first aluminum source and a modifier to obtain aluminum oxide precursor nanofibers; mixing the aluminum oxide precursor nanofibers with a second aluminum source, and adding the mixture to a solution of a platinum-containing compound, a tin-containing compound, and a lanthanide-containing compound to prepare a catalyst precursor slurry; adding gelatin and gum arabic to the catalyst precursor slurry, uniformly mixing same to prepare a composite colloidal solution, adding the composite colloidal solution dropwise to a liquid column consisting of an upper-layer oil phase and a lower-layer curing agent solution to shape the composite colloidal solution, then after aging, drying, and calcining, obtaining an oxidized spherical catalyst; and reducing the obtained oxidized spherical catalyst to obtain an activated spherical catalyst. Because active metals can be better dispersed on the surface of the spherical catalyst, the dispersion of Pt is improved, thus improving the carbon deposition resistance and stability of the catalyst.

Description

A continuous reforming catalyst and its preparation method Technical Field

[0001] The present invention belongs to the technical field of catalyst preparation, and in particular relates to a continuous reforming catalyst and a preparation method thereof. Background Art

[0002] Catalytic reforming is a key petroleum refining process, primarily aimed at producing high-octane gasoline, BTX aromatics, and hydrogen as a byproduct. High-performance catalysts are crucial to the economic benefits of the catalytic reforming process. Reforming catalysts possess dual functions: a metal center and an acid center. Currently, the most commonly used reforming catalysts in industry are Pt-Re / Al2O3 catalysts for semi-regenerative reforming processes and Pt-Sn / Al2O3 catalysts for continuous regenerative reforming processes, with the latter being more widely used. The main side reactions of catalytic reforming are hydrocracking, hydrogenolysis, and coking, which reduce liquid yield and catalyst stability. Hydrogenolysis and coking are structure-sensitive reactions that primarily occur on large Pt particles. During the reduction-reaction-regeneration process, high temperatures promote the sintering of small Pt particles into larger ones. Therefore, a catalyst with stable small Pt particles is urgently needed to enhance the reactivity of catalytic reforming catalysts.

[0003] From the perspective of the carrier, improving the pore structure of spherical alumina is an effective means to promote Pt dispersion. Our team has invented a green process for improving the pore structure of alumina (CN 110424070 A), and the synthesized porous alumina nanofibers have a specific surface area of ​​up to 505.4 m 2 / g, with a pore volume of up to 2.70 cm 3 / g. If this material is added during the molding process, it is expected to improve the pore structure of the spherical alumina carrier. However, due to the lack of peptization solubility, it is not suitable for direct use in the spherical alumina molding process. At the same time, the team invented a process for preparing spherical alumina from one or more aluminum sources selected from pseudo-boehmite, boehmite, metallic aluminum, aluminum salts, and aluminum alcohols (CN 113289595 B). The average particle size of the spherical alumina is between 1.8-1.85 mm, and the average strength is between 35-75 N. However, the bulk ratio of spherical alumina is high and the pore structure is poor.

[0004] From the perspective of active metals, forming a strong metal-support interaction is an effective way to inhibit the sintering of Pt during reduction-reaction-regeneration. CN 110064422A discloses a multi-metal continuous reforming catalyst and a preparation method thereof. First, a Sn-containing alumina support is prepared, and then the support is reacted with an impregnation solution containing an ammonium salt and Pt. This promotes the exchange reaction between the alumina support and the platinum-containing compound, and enhances the adsorption capacity of the platinum-containing compound on the support surface. CN 105561991A discloses a Pt-Sn continuous reforming catalyst and a preparation method thereof. The Pt-Sn-loaded alumina is placed in a Sn salt and solid-phase heated, which is conducive to the enrichment of the tin component in the outer shell area. This promotes the formation of Pt-Sn interaction. However, these methods not only have cumbersome synthesis processes but also easily cause environmental pollution. Technical issues

[0005] The purpose of the present invention is to provide a continuous reforming catalyst and a preparation method thereof. The spherical catalyst product obtained by the preparation method has high strength and good sphericity; Pt particles are better stabilized in the spherical catalyst, thereby improving the stability and selectivity of the catalyst and inhibiting coking. Technical Solutions

[0006] The present invention first provides a method for preparing a continuous reforming catalyst, comprising the following steps:

[0007] (1) hydrothermally crystallizing a first aluminum source and a modifier to obtain aluminum oxide precursor nanofibers;

[0008] (2) mixing the alumina precursor nanofibers with a second aluminum source and adding the mixture to a solution containing a platinum compound, a tin compound, and a lanthanide compound to prepare a catalyst precursor slurry;

[0009] (3) adding gelatin and gum arabic to the catalyst precursor slurry, uniformly mixing to form a composite glue solution, and then dripping the composite glue solution into a liquid column consisting of an upper oil phase and a lower curing agent solution to form a spherical catalyst. After aging, drying, and calcining, an oxidized spherical catalyst is obtained.

[0010] (4) The oxidized spherical catalyst obtained above is reduced to obtain an activated spherical catalyst.

[0011] Preferably, the second aluminum source in step (2) is one or more of pseudo-boehmite, boehmite or amorphous alumina.

[0012] Preferably, in step (2), the mass ratio of the alumina nanofibers to the second aluminum source is (0.1-1):1.

[0013] Preferably, the platinum-containing compound in step (2) is one or more of chloroplatinic acid, ammonium chloroplatinate, platinum tetrachloride or platinum nitrate.

[0014] Preferably, the tin-containing compound in step (2) is stannous chloride or tin tetrachloride.

[0015] Preferably, the lanthanide-containing compound in step (2) is a soluble salt of lanthanum, cerium or yttrium.

[0016] Preferably, in step (3), the composite glue solution contains:

[0017] The mass content of alumina is controlled to be 5-20wt%;

[0018] The gelatin content is controlled to be 0.5-8wt%;

[0019] The mass content of the gum arabic is controlled to be 0.5-8wt%.

[0020] Preferably, in step (3), the drying temperature is 50-100°C, the drying time is 6-24 hours, the roasting temperature is 500-700°C, and the roasting time is 6-24 hours.

[0021] Preferably, in step (4), the reduction temperature is 400-700° C., and the reduction time is 6-24 hours.

[0022] The present invention also provides a continuous reforming catalyst obtained by the above preparation method, using spherical alumina as a carrier and the component contents calculated based on the carrier are as follows:

[0023] Platinum 0.2-1.0wt%;

[0024] Tin 0.1-1.0wt%;

[0025] Chlorine 0.5-2.0wt%;

[0026] Lanthanide elements 0.01-2wt%;

[0027] The platinum, tin and lanthanide elements in the catalyst are uniformly dispersed in the carrier, the dispersion of Pt is between 45% and 55%, and the specific surface area of ​​the catalyst is between 180 and 220 m 2 / g, with a pore volume of 0.5-0.7 cm 3 / between grams. Beneficial effects

[0028] The present invention provides a continuous reforming catalyst and a method for preparing the same. In this method, nanofibers of a porous alumina precursor are mixed with a second aluminum source and then directly reacted with a Pt-Sn precursor to form a composite colloid, which facilitates the formation of a metal-support interaction. The composite colloid is then formed in a liquid column to produce an oxidized spherical catalyst. The physical barrier effect of the alumina support effectively inhibits the sintering of Pt particles. The addition of the nanofibers of the porous alumina precursor to the oxidized spherical catalyst increases the utilization of the pores within the spherical catalyst, while suitable reduction conditions facilitate the migration of Pt-Sn nanoparticles to the catalyst surface. This ensures maximum utilization of the active sites in the spherical catalyst. Therefore, the present invention stabilizes the Pt particles through metal-support interaction. Furthermore, the spherical catalyst's well-developed pore structure and suitable reduction conditions facilitate maximum utilization of the catalyst's active sites. Furthermore, the prepared spherical catalyst product exhibits high strength and good sphericity. The Pt particles are better stabilized within the spherical catalyst, thereby improving the catalyst's stability and selectivity and inhibiting coking.

[0029] The present invention's continuous reforming catalyst preparation method utilizes the direct interaction of a Pt-Sn precursor with an alumina precursor, and then utilizes the sol-gel properties of polymer materials to produce a spherical catalyst. Compared to traditional catalyst preparation methods, this process eliminates the subsequent impregnation, drying, and calcination steps required for catalyst preparation, shortening the production process steps, improving production efficiency, and facilitating industrial continuous production. DETAILED DESCRIPTION

[0030] The present invention first provides a method for preparing a continuous reforming catalyst, comprising the following steps:

[0031] (1) hydrothermally crystallizing a first aluminum source and a modifier to obtain aluminum oxide precursor nanofibers;

[0032] The first aluminum source is preferably activated aluminum hydroxide powder, which is preferably obtained by activating aluminum hydroxide at 100°C for 5 hours under a nitrogen atmosphere. The modifier is preferably an ammonium salt or an amide compound, more preferably biuret. The molar ratio of aluminum in the first aluminum source to the modifier is preferably 1:10. The crystallization reaction temperature is preferably 80°C, and the time is preferably 14 hours.

[0033] (2) mixing the alumina precursor nanofibers with a second aluminum source and adding the mixture to a solution containing a platinum compound, a tin compound, and a lanthanide compound to prepare a catalyst precursor slurry;

[0034] According to the present invention, a platinum-containing compound, a tin-containing compound, and a lanthanide-containing compound are first dissolved in a nitric acid solution to prepare an impregnation solution, and then a second aluminum source is dispersed in deionized water, the prepared impregnation solution is added, and then the above-mentioned aluminum oxide precursor nanofibers are added. After stirring evenly, the pH of the mixed slurry is adjusted to 7-8 to obtain a catalyst precursor slurry;

[0035] According to the present invention, porous alumina fibers have a well-developed pore structure but are not suitable for directly preparing spherical alumina. Therefore, it is necessary to select a suitable second aluminum source that forms a strong interaction with the nanofibers of the porous alumina precursor while providing peptization to increase the strength of the spherical alumina. Furthermore, by adjusting the ratio of the porous alumina precursor nanofibers to the second aluminum source, the pore structure of the spherical alumina can be controlled. The second aluminum source is preferably one or more of pseudo-boehmite, boehmite, and amorphous alumina, and the mass ratio of the porous alumina nanofibers to the second aluminum source is preferably 0.1-1.

[0036] The suitable Pt and Sn compounds of the present invention can form Pt-Sn precursors in advance and form a strong effect with the porous alumina fibers during molding. The platinum-containing compound is preferably one or more of chloroplatinic acid, ammonium chloroplatinate, platinum tetrachloride, and platinum nitrate, more preferably chloroplatinic acid, and the tin-containing compound is preferably stannous chloride or tin tetrachloride, more preferably stannous chloride. The lanthanide-containing compound preferably contains at least one of lanthanum, cerium, and yttrium, more preferably a soluble salt of lanthanum, cerium, and yttrium, and most preferably lanthanum nitrate. The addition amount of the second aluminum source, the platinum-containing compound, the tin-containing compound, and the lanthanide-containing compound is 0.01-2wt% of the mass of the second aluminum source; wherein the mass ratio of the platinum-containing compound, the tin-containing compound, and the lanthanide-containing compound is preferably 0.82:0.63:0.26;

[0037] (3) adding gelatin and gum arabic to the catalyst precursor slurry, uniformly mixing to form a composite glue solution, and then dripping the composite glue solution into a liquid column consisting of an upper oil phase and a lower curing agent solution to form a spherical catalyst. After aging, drying, and calcining, an oxidized spherical catalyst is obtained.

[0038] The ratio of gelatin and gum arabic in the composite glue of the present invention is crucial to the molding process, which is the key to regulating the strength and sphericity of spherical alumina.

[0039] The mass content of aluminum oxide is preferably controlled to be 5-20wt%;

[0040] The gelatin content is preferably controlled to be 0.5-8wt%;

[0041] The mass content of the gum arabic is preferably controlled to be 0.5-8wt%.

[0042] The curing agent solution phase contains 1 wt% glutaraldehyde and 0.4 wt% surfactant (AEO-6), and the pH of the curing agent solution phase is adjusted to 3-4 using nitric acid. The temperature in the liquid column is controlled at 5-10°C. Droplets of the composite adhesive shrink into spheres in the white oil phase, and after passing through the oil-water interface and entering the curing agent solution phase, undergo a gelation reaction to form composite gel spheres. The gel spheres are then aged in the curing agent solution phase for 5-60 minutes until they are completely cured.

[0043] According to the present invention, in order to suppress the sintering of Pt-Sn particles caused by drying and calcining and the formation of strong interaction between Sn and alumina, it is necessary to select a suitable treatment temperature. In step (3), the temperature of the drying step is preferably 50-100°C and the time is preferably 6-24 hours; the temperature of the calcining step is preferably 500-700°C and the time is preferably 6-24 hours;

[0044] (4) The oxidized spherical catalyst obtained above is reduced to obtain an activated spherical catalyst.

[0045] According to the present invention, reduction can activate Pt-Sn particles, but it will cause the loss of chlorine. The reducing conditions will regulate the migration of Pt-Sn particles dispersed in the spherical alumina. This is achieved by the reduction gas adsorbed on the metal atoms migrating to the metal-support interface, promoting the migration of Pt-Sn particles in the spherical alumina to the surface. However, excessive migration may also lead to severe sintering of Pt-Sn particles. Therefore, suitable reducing conditions are necessary. The reduction temperature of the present invention is preferably 400-700°C, the time is preferably 6-24 hours, and the reduction is carried out in one or more atmospheres of H2, CO, and N2.

[0046] The present invention also provides a continuous reforming catalyst obtained by the above preparation method, using spherical alumina as a carrier and the component contents calculated based on the carrier are as follows:

[0047] Platinum 0.2-1.0wt%;

[0048] Tin 0.1-1.0wt%;

[0049] Chlorine 0.5-2.0wt%;

[0050] Lanthanide elements 0.01-2wt%;

[0051] The platinum, tin and lanthanide elements in the catalyst are uniformly dispersed in the carrier, the dispersion of Pt is between 45% and 55%, and the specific surface area of ​​the catalyst is between 180 and 220 m 2 / g, with a pore volume of 0.5-0.7 cm3 / g.

[0052] The present invention is further described in detail below with reference to specific examples, in which the raw materials involved are all commercially available. Example

[0053] The method for preparing a continuous reforming catalyst described in this embodiment comprises the following steps:

[0054] (1) At room temperature, a 30% mass fraction of biuret solution was prepared, and then activated aluminum hydroxide powder (aluminum hydroxide was activated at 100°C for 5 hours under a nitrogen atmosphere) was added according to the molar ratio of biuret to Al of 10:1. The mixture was stirred evenly and transferred to a crystallization kettle. The mixture was crystallized at 80°C for 14 hours. The solid obtained after crystallization was filtered, washed, and dried at 80°C for 12 hours to obtain porous alumina precursor nanofibers.

[0055] (2) 0.82 g of H2PtCl6·6H2O, 0.63 g of SnCl2·2H2O, and 0.26 g of La(NO3)3 were dissolved in 22 g of 30% nitric acid solution to prepare an impregnation solution; SB powder (pseudo-boehmite produced by Sasol, Germany) with an alumina content of 100 g was dispersed in deionized water, and then the prepared impregnation solution was added. After the SB powder was completely converted into a sol, porous alumina precursor nanofibers with an alumina content of 10 g were added. After stirring evenly, the pH of the mixed slurry was adjusted to 7-8, and the alumina content was adjusted to 10 wt% to obtain an aluminum gel containing catalyst components. At this time, the catalyst components were anchored on the gel-like alumina precursor to prepare a catalyst precursor slurry.

[0056] (3) The catalyst precursor slurry is heated to 60°C, 25g of gelatin and 25g of gum arabic are added, and the mixture is stirred thoroughly to dissolve to form a composite glue solution; the composite glue solution is dripped into a liquid column composed of a white oil upper layer and a curing agent solution lower layer to form a liquid column, wherein the curing agent solution phase has a glutaraldehyde content of 1wt% and a surfactant (AEO-6) content of 0.4wt%, and the pH of the curing agent solution phase is adjusted to 3-4 with nitric acid; the temperature in the liquid column is controlled to 5-10°C, and the droplets of the composite glue solution will shrink into balls in the white oil phase, and after passing through the oil-water interface and entering the curing agent solution phase, a gelation reaction occurs to form composite gel balls, and the gel balls are further aged in the curing agent solution phase for 5-60 minutes until they are completely solidified; the solidified gel balls are taken out and dried at 100°C for 6 hours, and then calcined at 550°C in air containing HCl atmosphere for 24 hours to obtain an oxidized spherical catalyst.

[0057] (4) The oxidized catalyst was reduced at 510°C for 3 hours in an atmosphere of hydrogen / CO with a volume fraction of 1 / 5, and then cooled to room temperature under a nitrogen atmosphere to obtain a spherical catalyst.

[0058] The spherical catalyst prepared in this example has an average particle size of 1.7 mm, an average strength of 85 N / particle, a bulk density of 0.68 g / ml, a pore volume of 0.55 ml / g, and a specific surface area of ​​190 m 2 / gram; platinum content is 0.28wt%, tin content is 0.3wt%, lanthanum content is 0.1wt%, and chlorine content is 1.05%. Example

[0059] The method for preparing a continuous reforming catalyst described in this embodiment comprises the following steps:

[0060] (1) Prepare porous alumina precursor nanofibers according to step (1) of Example 1.

[0061] (2) 0.82 g of H2PtCl6·6H2O, 0.63 g of SnCl2·2H2O, and 0.26 g of La(NO3)3 were dissolved in 22 g of 30% nitric acid solution to prepare an impregnation solution; SB powder with an alumina content of 80 g was dispersed in a certain amount of deionized water, and then the prepared impregnation solution was added. After the SB powder was completely converted into a sol, porous alumina precursor nanofibers with an alumina content of 30 g were added. After stirring evenly, the pH of the mixed slurry was adjusted to 7-8, and the alumina content was adjusted to 10 wt% to obtain an aluminum gel containing catalyst components. At this time, the catalyst components were anchored on the gel-like alumina precursor to prepare a catalyst precursor slurry.

[0062] (3) Molding, aging, drying and calcining are carried out according to the steps described in step (3) of Example 1.

[0063] (4) The oxidized catalyst was reduced at 580°C for 3 hours in an atmosphere of hydrogen / nitrogen with a volume ratio of 2 / 3, and then cooled to room temperature under a nitrogen atmosphere to obtain spherical alumina.

[0064] The results show that the average particle size of the spherical catalyst prepared in this example is 1.7 mm, the average strength is 65 N / particle, the bulk density is 0.58 g / ml, the pore volume is 0.62 ml / g, and the specific surface area is 196 m 2 / gram; platinum content is 0.28wt%, tin content is 0.3wt%, lanthanum content is 0.1wt%, and chlorine content is 1.05%. Example

[0065] The method for preparing a continuous reforming catalyst described in this embodiment comprises the following steps:

[0066] (1) Prepare porous alumina precursor nanofibers according to step (1) of Example 1.

[0067] (2) 0.82 g of H2PtCl6·6H2O, 0.63 g of SnCl2·2H2O, and 0.26 g of La(NO3)3 were dissolved in 22 g of 30% nitric acid solution to prepare an impregnation solution; SB powder with an alumina content of 75 g was dispersed in a certain amount of deionized water, and then the prepared impregnation solution was added. After the SB powder was completely converted into a sol, porous alumina precursor nanofibers with an alumina content of 35 g were added. After stirring evenly, the pH of the mixed slurry was adjusted to 7-8, and the alumina content was adjusted to 10 wt% to obtain an aluminum gel containing catalyst components. At this time, the catalyst components were anchored on the gel-like alumina precursor to prepare a catalyst precursor slurry;

[0068] (3) Molding, aging, drying and calcining are carried out according to the steps described in step (3) of Example 1.

[0069] (4) The oxidized catalyst was reduced at 450°C for 3 hours in an atmosphere of CO / nitrogen gas with a volume fraction of 2 / 5, and then cooled to room temperature in a nitrogen atmosphere to obtain spherical alumina.

[0070] The spherical catalyst prepared in this example has an average particle size of 1.7 mm, an average strength of 45 N / particle, a bulk density of 0.56 g / ml, a pore volume of 0.66 ml / g, and a specific surface area of ​​200 m 2 / g; platinum content is 0.28wt%, tin content is 0.3wt%, lanthanum content is 0.1wt%, and chlorine content is 1.05%.

[0071] Comparative Example 1

[0072] Spherical alumina containing additives is first prepared without adding porous alumina precursor nanofibers, and then platinum is loaded by the traditional equal volume impregnation method, including the following steps:

[0073] ① Dissolve 0.63 grams of SnCl2·2H2O and 0.26 grams of La(NO3)3 in 22 grams of 30% nitric acid solution to prepare an additive solution; disperse SB powder with an alumina content of 110 grams in a certain amount of deionized water, then add the additive solution, and after complete gelation, prepare an aluminum sol containing the catalyst component; adjust the pH of the aluminum sol containing the catalyst component to 7-8 to obtain an aluminum gel containing the catalyst component, and adjust the alumina content of the aluminum gel to 10wt%. At this time, the catalyst component is anchored on the gel-like alumina precursor to prepare a catalyst precursor slurry.

[0074] ② The spherical alumina carrier containing additives was prepared by molding, aging, and drying according to the steps described in step (3) of Example 1, and then calcining in an air atmosphere at 550°C for 12 hours.

[0075] ③ Take 50 g of the prepared spherical alumina support and 0.375 g of H2PtCl6·6H2O, and use the equal volume impregnation method to impregnate platinum onto the alumina support. Then, dry it at 100°C and calcine it at 530°C. After calcination, reduce it with hydrogen at 510°C for 3 hours, and then cool it to room temperature under a nitrogen atmosphere to obtain a comparative catalyst.

[0076] The catalyst prepared in this comparative example has an average particle size of 1.7 mm, an average strength of 85 N / particle, a bulk density of 0.70 g / ml, a pore volume of 0.5 ml / g, and a specific surface area of ​​190 m 2 / g, platinum content is 0.28wt%, tin content is 0.3wt%, lanthanum content is 0.1wt%, and chlorine content is 1.05%. Example

[0077] In this example, the platinum dispersion of the catalysts of the examples of the present invention and the comparative example was measured using a hydrogen-oxygen titration method (i.e., a hydrogen adsorption reduction-oxygen titration-hydrogen titration cycle method). The results are shown in Table 1. It can be seen from the table that the dispersion of platinum on the catalysts in Examples 1-3 is significantly higher than the dispersion of platinum on the catalyst in Comparative Example 1.

[0078] Table 1

[0079] Example

[0080] This example evaluates the performance of the catalysts of the present invention and the comparative example catalysts.

[0081] In the microreactor evaluation device, 3 ml of catalyst was loaded and the catalyst performance was evaluated using n-heptane as the raw material. The reaction conditions were controlled as follows: reaction temperature 510 ° C, pressure 0.7 MPa, hydrogen-to-oil molar ratio of 5, feed liquid volume space velocity of 5 hours -1 , the carbon content of the catalyst after 12 hours of reaction was measured. The reaction results of the catalysts of each embodiment and comparative example are shown in Table 2.

[0082] Table 2

[0083]

[0084] From Table 2, we can see that the aromatic hydrocarbon yield and C5 + The yield is higher than that of the comparative catalyst, and the carbon deposition amount of the catalyst of the present invention is lower than that of the comparative catalyst, indicating that the catalyst of the present invention has good activity, selectivity and stability.

[0085] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing a continuous reforming catalyst, characterized in that: The steps include: (1) hydrothermally crystallizing a first aluminum source and a modifier to obtain aluminum oxide precursor nanofibers; the first aluminum source is active aluminum hydroxide powder, and the modifier is an ammonium salt or an amide compound; (2) mixing the above-mentioned alumina precursor nanofibers with a second aluminum source, and adding the mixture to a solution containing a platinum compound, a tin compound, and a lanthanide compound to prepare a catalyst precursor slurry; the second aluminum source is one or more of pseudo-boehmite, boehmite, or amorphous alumina; (3) adding gelatin and gum arabic to the catalyst precursor slurry, uniformly mixing to form a composite glue solution, and then dropping the composite glue solution into a liquid column composed of an upper oil phase and a lower curing agent solution to form a spherical catalyst after aging, drying and calcining; (4) The oxidized spherical catalyst obtained above is reduced to obtain an activated spherical catalyst.

2. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that: In the step (2), the mass ratio of the alumina nanofibers to the second aluminum source is (0.1-1):

1.

3. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that: The platinum-containing compound in step (2) is one or more of chloroplatinic acid, ammonium chloroplatinate, platinum tetrachloride or platinum nitrate.

4. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that: The tin-containing compound in step (2) is stannous chloride or tin tetrachloride.

5. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that: The lanthanide compound in step (2) is a soluble salt of lanthanum, cerium or yttrium.

6. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that: In the step (3), the composite glue solution comprises: The mass content of aluminum oxide is controlled to be 5-20wt%; Control the mass content of the gelatin to be 0.5-8wt%; The mass content of the gum arabic is controlled to be 0.5-8wt%.

7. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that: In the step (3), the drying temperature is 50-100°C, the drying time is 6-24 hours, the roasting temperature is 500-700°C, and the roasting time is 6-24 hours.

8. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that: In the step (4), the reduction temperature is 400-700° C., and the reduction time is 6-24 hours.

9. The continuous reforming catalyst obtained by the preparation method according to claim 1, characterized in that: The component contents calculated based on spherical alumina as the carrier and the carrier are as follows: Platinum 0.2-1.0wt%; Tin 0.1-1.0wt%; Chlorine 0.5-2.0wt%; Lanthanide 0.01-2wt%; In the catalyst, platinum, tin and lanthanide elements are uniformly dispersed in the carrier, the dispersion of Pt is between 45% and 55%, and the specific surface area of ​​the catalyst is between 180 and 220 m 2 / g, pore volume between 0.5-0.7 cm 3 / g.

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