Continuous reforming catalyst as well as preparation method and application thereof

Abstract

The invention discloses a continuous reforming catalyst and a preparation method and application thereof.The preparation method comprises the steps that treated aluminum oxide pellets are subjected to equivalent-volume impregnation in impregnation liquid containing organic tin and inorganic tin in sequence and roasted in the nitrogen atmosphere and the air atmosphere respectively, and aluminum oxide containing both the organic tin and the inorganic tin is obtained; and then carrying out dynamic excessive impregnation in an impregnation liquid containing a platinum compound and a competitive adsorbent, and carrying out water-chlorine activation and reduction to obtain the continuous reforming catalyst. By loading different tin species step by step and controlling the roasting atmosphere, high dispersion of the metal active component and accurate regulation and control of the acidity of the carrier are realized, and the prepared catalyst shows excellent aromatic hydrocarbon selectivity, activity stability and low carbon deposition rate in a naphtha reforming reaction, and is suitable for a high-severity continuous reforming process.

Description

Technical Field

[0001] This invention belongs to the field of catalyst technology, specifically relating to a continuous reforming catalyst, its preparation method, and its application. Background Technology

[0002] Catalytic reforming is a crucial process in the petroleum refining industry. Its purpose is to convert naphtha into reformate rich in aromatics, which can be directly used as a blending component in automotive gasoline or to produce light aromatics such as benzene, toluene, and xylene. The byproduct hydrogen is a major source of hydrogen for refinery hydrotreating units. Industrially used reforming catalysts are mostly supported catalysts, with platinum as the main active component and the addition of rhenium, tin, iridium, and other co-active components to improve catalyst stability. Currently, reforming catalysts are mostly prepared using impregnation methods, such as co-impregnation or stepwise impregnation, where platinum precursors and co-active component precursors are loaded onto a support, dried, calcined at high temperature, and then reduced. However, the high-temperature calcination process converts the active component precursor into active component oxides. During this process, platinum particles generated on the support surface migrate and sinter, reducing platinum dispersion and thus affecting catalyst performance.

[0003] Patent CN 101468313A discloses a method for preparing a platinum reforming catalyst, which uses C1~C3 alcohols, organic acids, etc. as dispersants to improve the dispersion of platinum precursors in the support, so that smaller platinum metal grains can be obtained after reduction, thereby improving the dispersion of platinum.

[0004] Patent CN 1465665A employs a novel impregnation method to prepare platinum-containing reforming catalysts. This method involves impregnation under reduced pressure and rotation, which allows the solvent in the impregnation solution to continuously evaporate during the impregnation process. Simultaneously, rotation enhances the contact between the impregnation solution and the support, thereby promoting the uniform distribution of the active components within the support.

[0005] Patents US5221465 and US7456130 respectively use methods of adding tin modifiers and chelates to prepare platinum-iridium and platinum-rhenium reforming catalysts, which improve the dispersion of active components, thereby improving the activity stability and selectivity of the catalysts.

[0006] Patent CN 110935458A discloses a method for preparing a hydrogenation demetallization catalyst. This method involves first calcining the formed support under a nitrogen atmosphere, and then calcining it again under an oxygen atmosphere to obtain an alumina support. During calcination under a nitrogen atmosphere, polyols or sugar compounds carbonize at the rod-shaped alumina clusters. During calcination under an oxygen atmosphere, the formed carbon rapidly oxidizes and burns, releasing heat and causing the temperature around the rod-shaped alumina clusters to rise rapidly above the calcination temperature. This further promotes the growth of alumina grains around the rod-shaped alumina clusters, increasing the macroporous content in the support.

[0007] The technologies mentioned in the aforementioned patent documents can improve platinum particle distribution to some extent, but since the sintering of platinum particles during high-temperature calcination cannot be fundamentally avoided, it affects the catalyst's potential optimal performance. Therefore, fundamentally avoiding the impact of the high-temperature calcination step on the state of the catalyst's active components during preparation, and further improving the catalyst's selectivity and activity to meet the stringent reaction process requirements of continuous naphtha reforming, remains a technical problem that needs to be solved. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a continuous reforming catalyst, its preparation method, and its application. By employing synergistic loading of organotin and inorganic tin and a differentiated calcination process, the platinum dispersion is improved, thereby enhancing the catalyst's activity, stability, and resistance to coking. The catalyst prepared by this invention exhibits high platinum dispersion, along with high activity and resistance to coking, meeting the stringent requirements of continuous catalytic reforming processes.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing a continuous reforming catalyst, comprising the following steps: (1) The alumina microspheres are calcined to remove the physically adsorbed water, while retaining the surface hydroxyl groups; (2) The alumina balls treated in step (1) are impregnated with an equal volume of impregnation solution containing organotin, and then dried and calcined in a nitrogen atmosphere to obtain alumina containing organotin. (3) The aluminum oxide obtained in step (2) is impregnated with an equal volume of impregnation solution containing inorganic tin, and then dried and calcined in an air atmosphere to obtain aluminum oxide containing both organic tin and inorganic tin. (4) The alumina obtained in step (3) is placed in an impregnation solution containing platinum compound and competing adsorbent for dynamic excess impregnation. Then, the excess impregnation solution is removed by filtration, followed by washing, drying, water chlorine activation and reduction to obtain the continuous reforming catalyst.

[0010] Furthermore, the alumina microspheres used in step (1) are γ-phase with a pore volume of 0.4~0.7 mL / g and a specific surface area of ​​170~220 m². 2 / g, bulk density of 0.5~0.7 g / mL, average particle size of 1.6~1.8 mm, and average strength of 30~60 N.

[0011] Furthermore, the roasting temperature in step (1) is 500 °C and the time is 3 h.

[0012] Further, the organotin impregnation solution mentioned in step (2) is specifically an aqueous solution containing one or more of tin acetate, tin oxalate, tin acetylacetonate, phenyl-substituted tin acetylacetonate, and tin acetylacetonate trichloride, preferably an aqueous solution of tin acetylacetonate.

[0013] Furthermore, based on the total mass of dry alumina as 100%, the mass fraction of organotin in the impregnation solution in step (2) is 0.10~1.00%.

[0014] Furthermore, the drying temperature in step (2) is 80~120 ℃ and the time is 2~4 h.

[0015] Furthermore, the roasting temperature in step (2) is 250~350 ℃ and the time is 2~4 h.

[0016] Further, the impregnation solution containing inorganic tin in step (3) is specifically an aqueous hydrochloric acid solution containing one or more of stannous chloride and stannous tetrachloride pentahydrate, preferably an aqueous hydrochloric acid solution containing stannous tetrachloride pentahydrate.

[0017] Furthermore, based on the mass of dry alumina as 100%, the mass fraction of inorganic tin in the impregnation solution in step (3) is 0.10~1.00%, preferably 0.10~0.50%, and the mass fraction of Cl is 0.50~1.0%.

[0018] Furthermore, the drying temperature in step (3) is 80~120 ℃ and the time is 2~4 h.

[0019] Furthermore, the roasting temperature in step (3) is 450~600 ℃ and the time is 2~6 h.

[0020] Furthermore, the molar ratio of organotin to inorganic tin in the alumina obtained in step (3) is 1:1 to 3:1.

[0021] Further, the platinum-containing compound in step (4) includes one or more of chloroplatinic acid, ammonium chloroplatinate, bromoplatinic acid, and platinum trichloride, preferably chloroplatinic acid.

[0022] Further, the competitive adsorbent in step (4) includes one or more of citric acid, hydrochloric acid, nitric acid, monochloroacetic acid, dichloroacetic acid, and trichloroacetic acid, preferably hydrochloric acid or citric acid.

[0023] Furthermore, based on the mass of dry alumina as 100%, the mass fraction of Pt in the impregnation solution in step (4) is 0.01~0.60%, preferably 0.10~0.40%, and the mass fraction of Cl is 0.60~1.50%, preferably 0.90~1.30%.

[0024] Furthermore, in step (4), the impregnation solution is in excess by 50% to 200%.

[0025] Furthermore, the immersion temperature in step (4) is 10~50 ℃ and the time is 10~48 h.

[0026] Furthermore, the drying temperature in step (4) is 80~120 ℃ and the time is 2~4 h.

[0027] Further, the water chlorination activation in step (4) is carried out in an air atmosphere containing water and hydrochloric acid at 450~700 ℃ for 4~6 h, wherein the molar ratio of water to hydrochloric acid is 100:1~10:1.

[0028] Furthermore, the reduction described in step (4) is carried out in a reducing atmosphere with a hydrogen content of 5% to 60% at 200 to 600 °C for 2 to 6 hours.

[0029] The continuous reforming catalyst prepared by the above method can be used in the continuous reforming reaction of naphtha.

[0030] The advantages of this invention are: This invention first loads organotin onto an alumina support. On one hand, the organotin ligands occupy high-energy sites (such as grain boundaries and defects) on the alumina surface through bidentate bonding (Sn-O-Al), providing uniform anchoring points for platinum. On the other hand, calcination in a low-temperature nitrogen atmosphere causes the organic ligands to slowly decompose and generate amorphous SnO. x Nanoclusters, with their surfaces rich in oxygen vacancies, facilitate platinum anchoring and can partially retain Sn. 2+ Subsequently, an electron transfer active interface is formed with platinum. Then, inorganic tin is loaded. On the one hand, the acidic ions provided by the inorganic tin can adjust the acidity of the support; on the other hand, the crystalline SnO2 particles generated after high-temperature calcination in air can fill the macropores of the support, inhibiting the high-temperature migration of platinum. Meanwhile, the amorphous SnO formed in the first step... x In the second step of air calcination, Sn also partially crystallizes into SnO2. Furthermore, Sn from organotin compounds... 2+ Sn from inorganic tin 4+ It can form an electron transport channel, jointly regulate the electron density of platinum, and enhance its resistance to carbon deposition.

[0031] In addition, the molar ratio of organotin to inorganic tin is controlled between 1:1 and 3:1. If there is an excess of inorganic tin, a large number of large SnO2 particles will be generated during air calcination, which will block the pores of the support, reduce the specific surface area, and decrease the dispersion of platinum. If there is an excess of organotin, the organic ligands will not decompose completely, which will hinder the formation of Pt-Sn alloy, resulting in high initial catalyst activity but poor thermal stability.

[0032] In summary, the continuous reforming catalyst obtained by this invention has a high degree of platinum dispersion, which makes the catalyst highly selective, active, strong against carbon deposition, and has a long service life, thus meeting the demanding reaction process requirements of continuous catalytic reforming of naphtha. Detailed Implementation

[0033] A method for preparing a continuous reforming catalyst, comprising the following steps: (1) The alumina microspheres were calcined at 500 °C for 3 h to remove the physically adsorbed water, while retaining the surface hydroxyl groups; (2) Impregnate the alumina balls treated in step (1) with an equal volume of impregnation solution containing organotin, then dry them at 80~120 ℃ for 2~4 h, and calcine them at 250~350 ℃ for 2~4 h in a nitrogen atmosphere to obtain alumina containing organotin. (3) The aluminum oxide obtained in step (2) is impregnated with an equal volume of impregnation solution containing inorganic tin, and then dried at 80~120 ℃ for 2~4 h and calcined at 450~600 ℃ in air atmosphere for 2~6 h to obtain aluminum oxide containing both organic tin and inorganic tin, wherein the molar ratio of organic tin to inorganic tin is 1:1~3:1. (4) The alumina obtained in step (3) is placed in an impregnation solution containing platinum compound and competing adsorbent, and dynamically over-impregnated at 10~50℃ for 10~48 h. Then, the excess impregnation solution is removed by filtration, followed by washing and drying at 80~120℃ for 2~4 h. Then, it is activated at 450~700℃ for 4~6 h in an air atmosphere containing water and hydrochloric acid (where the molar ratio of water to hydrochloric acid is 100:1~10:1). After that, it is treated at 200~600℃ for 2~6 h in a reducing atmosphere with a hydrogen content of 5%~60% to obtain the continuous reforming catalyst.

[0034] In step (1), the alumina microspheres are γ-phase with a pore volume of 0.4~0.7 mL / g and a specific surface area of ​​170~220 m². 2 / g, bulk density of 0.5~0.7 g / mL, average particle size of 1.6~1.8 mm, and average strength of 30~60 N.

[0035] The organotin-containing impregnation solution mentioned in step (2) is specifically an aqueous solution containing one or more of the following: tin acetate, tin oxalate, tin acetylacetonate, phenyl-substituted tin acetylacetonate, and tin acetylacetonate trichloride. Based on the total mass of dry alumina as 100%, the mass fraction of organotin in the impregnation solution is 0.10~1.00%.

[0036] The inorganic tin-containing impregnation solution mentioned in step (3) is specifically an aqueous hydrochloric acid solution containing one or more of stannous chloride and stannous tetrachloride pentahydrate. Based on the total mass of dry alumina as 100%, the mass fraction of inorganic tin in the impregnation solution is 0.10~1.00%, and the mass fraction of Cl is 0.50~1.0%.

[0037] The platinum-containing compound mentioned in step (4) includes one or more of chloroplatinic acid, ammonium chloroplatinate, bromoplatinic acid, and platinum trichloride. The competing adsorbent includes one or more of citric acid, hydrochloric acid, nitric acid, monochloroacetic acid, dichloroacetic acid, and trichloroacetic acid. Based on 100% dry alumina mass, the impregnation solution contains 0.01~0.60% Pt and 0.60~1.50% Cl by mass.

[0038] To make the content of this invention easier to understand, the technical solution of this invention will be further described below with reference to specific embodiments, but this invention is not limited thereto.

[0039] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0040] Example 1 (1) Carrier pretreatment: First, the alumina microspheres were calcined at 500 °C for 3 h to remove physically adsorbed water and retain the surface hydroxyl groups.

[0041] (2) Loading organotin: The pretreated alumina support was impregnated with a prepared acetylacetone tin solution by the equal volume impregnation method. The mass fraction of Sn in the impregnation solution was 0.20% (relative to the dry weight of alumina). After impregnation at room temperature for 24 h, it was dried by rotary evaporation at 100 °C for 4 h, and then calcined at 300 °C for 3 h in a nitrogen atmosphere to obtain an alumina support containing organotin.

[0042] (3) Loaded inorganic tin: The alumina carrier containing organotin obtained in step (2) was impregnated with a prepared hydrochloric acid aqueous solution of tin tetrachloride pentahydrate by the equal volume impregnation method. The mass fraction of Sn in the impregnation solution was 0.10% and the mass fraction of Cl was 0.50% (relative to the dry weight of alumina). After impregnation at room temperature for 24 h, it was dried by rotary evaporation at 100 °C for 4 h, and then calcined at 500 °C in air for 3 h to obtain an alumina carrier containing both organotin and inorganic tin (molar ratio 2:1).

[0043] (4) Obtaining reforming catalyst by excessive impregnation of platinum component: The alumina support prepared in step (2) was added to a hydrochloric acid solution containing platinum chlorate hexahydrate with pH < 3. The mass fraction of Pt in the solution was 0.28% and the mass fraction of Cl was 1.40% (relative to the dry weight of alumina). The excess impregnation method was used. The solution was impregnated in a rotary evaporator at 30 °C for 24 h, filtered, washed, and dried by rotary evaporation at 100 °C for 6 h. Then, the solution was activated with water chlorine for 4 h by passing air containing hydrochloric acid and water (water / hydrochloric acid molar ratio of 30:1) at 550 °C. Finally, the solution was reduced in hydrogen at 500 °C for 3 h to obtain the reduced catalyst.

[0044] Example 2 The catalyst was prepared according to the method of Example 1, except that the Sn mass fraction in the impregnation solution used in step (3) was 0.20% (relative to the dry basis alumina weight), thus obtaining an alumina support containing both organotin and inorganic tin (molar ratio 1:1).

[0045] Example 3 The catalyst was prepared according to the method of Example 1, except that the Sn mass fraction in the impregnation solution used in step (2) was 0.30% (relative to the dry basis alumina weight), thus obtaining an alumina support containing both organotin and inorganic tin (molar ratio 3:1).

[0046] Example 4 The catalyst was prepared according to the method of Example 1, except that the impregnation solution in step (2) was a tin acetate solution.

[0047] Example 5 The catalyst was prepared according to the method of Example 1, except that the impregnation solution in step (2) was a tin acetate solution and the mass fraction of Sn was 0.15% (relative to the weight of dry alumina); the mass fraction of Sn in the impregnation solution in step (3) was 0.15% (relative to the weight of dry alumina).

[0048] Example 6 The catalyst was prepared according to the method of Example 1, except that in step (2), it was calcined at 350 °C for 2 h in a nitrogen atmosphere.

[0049] Example 7 The catalyst was prepared according to the method of Example 1, except that in step (3), it was calcined at 450 °C for 4 h in an air atmosphere.

[0050] Comparative Example 1 The catalyst was prepared according to the method of Example 1, except that step (3) was omitted, that is, only organotin was used for impregnation, and the mass fraction of Sn in the impregnation solution was 0.30% (relative to the dry basis alumina weight).

[0051] Comparative Example 2 The catalyst was prepared according to the method of Example 1, except that step (2) was omitted, that is, only inorganic tin was used for impregnation, and the mass fraction of Sn in the impregnation solution was 0.30% (relative to the dry basis alumina weight).

[0052] Comparative Example 3 The catalyst was prepared according to the method of Example 1, except that a mixed organic-inorganic tin solution was used for simultaneous impregnation. That is, the pretreated alumina support was impregnated with a prepared solution containing tin acetylacetone and tin tetrachloride pentahydrate by equal volume impregnation. The mass fraction of organic tin Sn in the impregnation solution was 0.20% and the mass fraction of inorganic tin Sn was 0.10% (relative to the dry weight of alumina). After impregnation at room temperature for 24 h, the alumina support was first calcined at 300 °C for 3 h in a nitrogen atmosphere, and then calcined at 500 °C for 3 h in an air atmosphere to obtain an alumina support containing organic-inorganic tin (molar ratio 2:1).

[0053] Comparative Example 4 The catalyst was prepared according to the method of Example 1, except that inorganic tin was impregnated first in step (3) and then organic tin was impregnated in step (2).

[0054] Comparative Example 5 The catalyst was prepared according to the method of Example 1, except that in step (2), after impregnation with organotin, it was calcined at 300 °C for 3 h in an air atmosphere.

[0055] Comparative Example 6 The catalyst was prepared according to the method of Example 1, except that in step (3), after impregnation with inorganic tin, it was calcined at 500 °C for 3 h under a nitrogen atmosphere.

[0056] Comparative Example 7 The catalyst was prepared according to the method of Example 1, except that in step (2), after impregnation with organotin, it was calcined at 500 °C for 3 h under a nitrogen atmosphere.

[0057] Comparative Example 8 The catalyst was prepared according to the method of Example 1, except that after impregnation with inorganic tin in step (3), it was calcined at 300 °C for 3 h in an air atmosphere.

[0058] Comparative Example 9 The catalyst was prepared according to the method of Example 1, except that the Sn content in the impregnation solution used in step (2) was 0.40% (relative to the weight of dry alumina), and the Sn content in the impregnation solution used in step (3) was 0.10% (relative to the weight of dry alumina), thus obtaining an alumina support containing both organotin and inorganic tin (molar ratio 4:1).

[0059] Table 1 shows the particle size of the Sn oxides obtained in each step of the examples and comparative examples.

[0060] Table 1

[0061] As shown in Table 1, at a certain temperature, a relatively suitable amorphous SnO can be obtained by combining organotin loading and calcination in a nitrogen atmosphere with inorganic tin loading and calcination in an air atmosphere. x And the size of the crystalline SnO2 particles. As shown in Comparative Examples 5-9, calcining the organotin-supported substrate in an air atmosphere or a high-temperature nitrogen atmosphere will cause the amorphous SnO2 to... x Larger particle size reduces the number of Pt anchor sites and weakens metal-support interaction (SMSI). Calcination of the inorganic tin-supported substrate in a nitrogen atmosphere or low-temperature air atmosphere further reduces the particle size of the crystalline SnO2. Highly dispersed SnO2 decreases the number of effective active sites for Pt, and smaller SnO2 particles contain less active Sn. 2+ If the proportion is too high, the electronic effect will be unbalanced, which may reduce the stability of the catalyst.

[0062] Table 2 shows the contents of Pt, Sn, and Cl, as well as the dispersion of Pt, in the catalysts obtained in the examples and comparative examples. Table 2

[0063] As shown in Table 2, the Pt dispersion in the reforming catalysts prepared in the examples is all above 88%, which is about 10% higher than that of reforming catalysts prepared by conventional methods, indicating that the catalysts of the present invention have high Pt dispersion. Meanwhile, as can be seen from Comparative Example 3, simultaneous loading of organotin and inorganic tin will generate SnO. x - The mixed SnO2 phase exhibits a slightly weaker interfacial anchoring effect, which is unfavorable for Pt anchoring and reduces dispersion. In contrast, in Comparative Example 4, loading inorganic tin first and then organic tin first generates large SnO2 particles, forming a rigid framework. However, the low surface energy of large SnO2 particles makes it difficult to effectively anchor Pt and also limits subsequent SnO2 loading. x The dispersion.

[0064] Catalyst evaluation: In a 100 mL apparatus, 50 mL of catalyst was loaded, and the performance of the catalyst was evaluated using pretreated refined naphtha as feedstock. The properties of the naphtha are shown in Table 3. The evaluation conditions were: reaction temperature 490 ℃, reaction pressure 0.43 MPa, hydrogen / hydrocarbon molar ratio 2.8, and feed volume hourly space velocity 1.45 h⁻¹. -1 The cumulative reaction time was 200 h, and the reaction results are shown in Table 4.

[0065] Table 3

[0066] Table 4

[0067] As shown in Table 4, under the same reaction conditions, the catalyst prepared in the examples has higher liquid yield, aromatics yield and BTX yield, while having lower coke content.

[0068] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A method for preparing a continuous reforming catalyst, characterized in that, Includes the following steps: (1) The alumina microspheres are calcined to remove the physically adsorbed water; (2) The alumina balls treated in step (1) are impregnated with an equal volume of impregnation solution containing organotin, and then dried and calcined in a nitrogen atmosphere to obtain alumina containing organotin. (3) The aluminum oxide obtained in step (2) is impregnated with an equal volume of impregnation solution containing inorganic tin, and then dried and calcined in an air atmosphere to obtain aluminum oxide containing both organic tin and inorganic tin. (4) The alumina obtained in step (3) is placed in an impregnation solution containing platinum compound and competing adsorbent for dynamic excess impregnation, and then filtered, washed, dried, activated with water chlorine and reduced to obtain the continuous reforming catalyst.

2. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The alumina microspheres used in step (1) are γ-phase with a pore volume of 0.4~0.7 mL / g and a specific surface area of ​​170~220 m². 2 / g, with a bulk density of 0.5~0.7 g / mL, an average particle size of 1.6~1.8 mm, and an average strength of 30~60 N; the calcination temperature is 500 ℃ and the time is 3 h.

3. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The organotin impregnation solution mentioned in step (2) is specifically an aqueous solution containing one or more of the following: tin acetate, tin oxalate, tin acetylacetone, phenyl-substituted tin acetylacetone, and tin acetylacetone trichloride; the mass fraction of organotin in the impregnation solution is 0.10~1.00% based on 100% dry alumina mass.

4. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The drying temperature in step (2) is 80~120 ℃ and the time is 2~4 h; the roasting temperature is 250~350 ℃ and the time is 2~4 h.

5. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The impregnation solution containing inorganic tin mentioned in step (3) is specifically an aqueous solution of hydrochloric acid containing one or more of stannous chloride and stannous tetrachloride; based on the mass of dry alumina as 100%, the mass fraction of inorganic tin in the impregnation solution is 0.10~1.00%, and the mass fraction of Cl is 0.50~1.0%.

6. A method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The drying temperature in step (3) is 80~120 ℃ and the time is 2~4 h; the roasting temperature is 450~600 ℃ and the time is 2~6 h.

7. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The molar ratio of organotin to inorganic tin in the alumina obtained in step (3) is 1:1 to 3:

1.

8. The method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The platinum-containing compound mentioned in step (4) includes one or more of chloroplatinic acid, ammonium chloroplatinate, bromoplatinic acid, and platinum trichloride; the competitive adsorbent includes one or more of citric acid, hydrochloric acid, nitric acid, monochloroacetic acid, dichloroacetic acid, and trichloroacetic acid; based on the mass of dry alumina as 100%, the mass fraction of Pt in the impregnation solution is 0.01~0.60%, and the mass fraction of Cl is 0.60~1.50%.

9. A method for preparing a continuous reforming catalyst according to claim 1, characterized in that, The impregnation temperature in step (4) is 10~50 ℃ and the time is 10~48 h; the drying temperature is 80~120 ℃ and the time is 2~4 h; the water chlorine activation is carried out in an air atmosphere containing water and hydrochloric acid at 450~700 ℃ for 4~6 h, wherein the molar ratio of water to hydrochloric acid is 100:1~10:1; the reduction is carried out in a reducing atmosphere with a hydrogen content of 5%~60% at 200~600 ℃ for 2~6 h.

10. The application of a continuous reforming catalyst prepared by the method described in claim 1 in the continuous reforming reaction of naphtha.

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