ZMQ-1 molecular sieve modified with phosphotungstic acid and its catalytic cracking catalyst

Abstract

This invention discloses a phosphotungstic acid-modified ZMQ-1 molecular sieve and its catalytic cracking catalyst, belonging to the field of molecular sieve technology. The catalytic cracking catalyst includes a phosphotungstic acid-modified ZMQ-1 molecular sieve, a composite binder, and water. The phosphotungstic acid-modified ZMQ-1 molecular sieve is obtained by ball milling 1.5-8 parts of homogenized phosphotungstic acid with 90-100 parts of ZMQ-1 molecular sieve for 2-3 hours. Through precise homogenization of the phosphotungstic acid and combined with an innovative binder composite technology, this invention successfully achieves a significant improvement in catalytic performance. This combined strategy not only significantly improves the conversion rate of the chemical reaction and ensures maximum utilization of raw materials, but also significantly increases the concentration of propylene in the liquefied petroleum gas (LPG) products, providing a richer and higher-quality source of raw materials for the production of downstream chemical products.

Description

Technical Field

[0001] This invention relates to the field of molecular sieve technology, specifically to ZMQ-1 molecular sieve modified with phosphotungstic acid and its catalytic cracking catalyst. Background Technology

[0002] In recent years, with the increasing deterioration of global crude oil resources, the supply of high-quality naphtha, a traditional feedstock for steam cracking, has been severely limited. This has not only restricted the production of chemicals such as ethylene but also seriously hindered the growth of propylene production, a crucial chemical feedstock. Faced with this challenge, the industry has actively sought alternative feedstocks and more economical and efficient ways to increase propylene production. Catalytic cracking (FCC) units, due to their wide availability of feedstocks and relatively low operating costs, have gradually become an important option for increasing propylene production. In the FCC process, the use of catalytic cracking additives is a crucial means to improve propylene yield and optimize product distribution.

[0003] For example, Chinese patent CN113546669B discloses a catalytic cracking additive containing phosphotungstic acid-modified high specific surface area mesoporous material, its preparation method, and its application. The catalytic cracking additive comprises a high silica-to-alumina ratio zeolite molecular sieve and a phosphotungstic acid-modified high specific surface area mesoporous material. The phosphotungstic acid-modified high specific surface area mesoporous material is spherical, and the total weight of the phosphotungstic acid-modified high specific surface area mesoporous material is used as the basis. This method can significantly increase the propylene concentration in liquefied petroleum gas (LPG) without increasing the yield of catalytic cracking LPG, and also improve the octane number of catalytic cracking gasoline.

[0004] However, although the aforementioned patents have made some progress in the field of catalytic cracking, there is still considerable room for improvement in their reaction conversion rate and the concentration of propylene in the products. At the same time, production efficiency also needs to be further optimized to enhance overall benefits.

[0005] Based on this, the present invention designs a phosphotungstic acid-modified ZMQ-1 molecular sieve and its catalytic cracking catalyst to solve the above problems. Summary of the Invention

[0006] To address the aforementioned shortcomings of existing technologies, this invention provides a phosphotungstic acid-modified ZMQ-1 molecular sieve and its catalytic cracking catalyst.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A phosphotungstic acid-modified ZMQ-1 molecular sieve, wherein the phosphotungstic acid-modified ZMQ-1 molecular sieve is obtained by ball milling 1.5-8 parts of homogenized phosphotungstic acid with 90-100 parts of ZMQ-1 molecular sieve for 2-3 hours;

[0009] The homogenization of phosphotungstic acid includes the following steps:

[0010] S1: Mix 1-3 parts of phosphotungstic acid preheated to 40-45℃, 2-4 parts of dispersant, 0.4-0.8 parts of co-dispersant and 100-150 parts of water, and stir at 3000-4000 rpm for 15-20 minutes in the dark to obtain a dispersion.

[0011] S2: Freeze-dry to remove water from the dispersion to obtain dispersed powder, and then pulverize it in an ultra-micro pulverizer at a speed of 700-800 rpm for 2-5 minutes to obtain ultra-micro dispersed powder.

[0012] S3: After vacuum sealing and packaging the ultra-micro dispersed powder, place it in the inner cavity of an ultra-high pressure equipment and hold it under pressure of 300-400MPa for 10-15 minutes to obtain homogenized phosphotungstic acid.

[0013] Furthermore, the dispersant is a mixture of butyl acrylate, butanone, and cellulose acetate in a mass ratio of 1.5-2.4:0.8-1.7:1.2-1.8.

[0014] Furthermore, the dispersant is one of dimethyl silicone oil, calcium carbonate powder, or calcium sulfate powder.

[0015] A catalytic cracking catalyst includes the aforementioned phosphotungstic acid-modified ZMQ-1 molecular sieve, and further includes a composite binder and water;

[0016] The preparation method of catalytic cracking catalyst includes the following steps:

[0017] Step 1: Prepare the composite adhesive;

[0018] Add silica sol and molybdenum trioxide powder to the reaction vessel and stir. Then add dispersant, defoamer and leveling agent in sequence. After stirring evenly, a composite adhesive is obtained.

[0019] Step 2: Mix the phosphotungstic acid modified ZMQ-1 molecular sieve, composite binder, and water to obtain the first slurry;

[0020] Step 3: Mix the first slurry and the metal salt aqueous solution and beat them to obtain the second slurry;

[0021] Step 4: After grinding the second slurry, spray dry and calcinate it to obtain the catalytic cracking catalyst.

[0022] Furthermore, step one specifically involves adding 15-20 parts of silica sol and 3-5 parts of molybdenum trioxide powder to a reaction vessel, then stirring at 100-150 rpm, and sequentially adding 1-3 parts of dispersant, 0.8-2.1 parts of defoamer, and 0.6-1.2 parts of leveling agent, stirring for 15-20 minutes until homogeneous to obtain a composite adhesive.

[0023] Furthermore, the dispersant is selected from dispersant BYK111, the defoamer is selected from defoamer BYK055, and the leveling agent is selected from leveling agent BYK1790.

[0024] Furthermore, step two specifically involves mixing phosphotungstic acid-modified ZMQ-1 molecular sieve, composite binder, and water in a mass ratio of 1-5:4-6:12-22 and pulping for 20-40 minutes to obtain the first slurry.

[0025] Furthermore, step three specifically involves mixing the first slurry (mass ratio 2-4:4-7) with the metal salt aqueous solution and beating for 20-40 minutes to obtain the second slurry.

[0026] Furthermore, the aqueous solution of the metal salt is one of sodium nitrate, ammonium nitrite, ferric sulfate, and sodium bisulfite.

[0027] Furthermore, step four specifically involves grinding the second slurry and then spray-drying it at 300-400℃ and calcining it at 540-600℃ for 1-2 hours to obtain the catalytic cracking catalyst.

[0028] Compared with the prior art, the beneficial effects of this invention are as follows:

[0029] 1. This invention significantly improves conversion efficiency and propylene concentration: By precisely homogenizing phosphotungstic acid and combining it with an innovative binder composite technology, this invention successfully achieves a substantial improvement in catalytic performance. This combined strategy not only significantly increases the conversion rate of the chemical reaction, ensuring maximum utilization of raw materials, but also significantly increases the concentration of propylene in the liquefied petroleum gas (LPG) products, providing a richer and higher-quality source of raw materials for the production of downstream chemical products. This synergistic effect fully demonstrates the uniqueness of this invention in terms of technological integration and innovation.

[0030] 2. This invention achieves efficient resource utilization by optimizing the catalyst preparation process: Particularly noteworthy is that the catalytic cracking catalyst prepared by this invention can be directly applied to the catalytic cracking process of feedstock oil at 480℃, without requiring additional harsh conditions or complex pretreatment steps. This characteristic not only simplifies the production process and reduces energy consumption and operational difficulty, but also significantly reduces carbon emissions during production, aligning with current international trends in green chemistry and sustainable development. Therefore, this invention improves production efficiency while also achieving efficient resource utilization and environmental friendliness.

[0031] 3. This invention reduces production costs and enhances market competitiveness: Given the improved conversion efficiency and propylene concentration, as well as the optimized preparation process, this invention can significantly reduce production costs in practical applications. Higher raw material utilization means less raw material consumption, while milder reaction conditions reduce energy consumption and maintenance costs. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Example 1: This example provides a catalytic cracking catalyst, comprising the following steps:

[0034] Step 1: Prepare homogenized phosphotungstic acid;

[0035] S1: Mix 3 parts of phosphotungstic acid preheated to 45℃, 4 parts of dispersant, 0.8 parts of co-dispersant and 150 parts of water, and stir at 4000 rpm for 20 minutes in the dark to obtain a dispersion.

[0036] The dispersant is a mixture of butyl acrylate, methyl ethyl ketone, and cellulose acetate in a mass ratio of 2.4:1.7:1.8.

[0037] The dispersant is calcium carbonate powder;

[0038] S2: Freeze-dry to remove water from the dispersion to obtain dispersed powder, and then pulverize it at 800 rpm for 5 minutes using an ultra-micro pulverizer to obtain ultra-micro dispersed powder.

[0039] S3: After vacuum sealing and packaging the ultra-micro dispersed powder, place it in the inner cavity of an ultra-high pressure equipment and hold it under pressure of 400MPa for 15 minutes to obtain homogenized phosphotungstic acid;

[0040] Step 2: Combine homogenized phosphotungstic acid with ZMQ-1 molecular sieve;

[0041] Eight parts of homogenized phosphotungstic acid and 100 parts of ZMQ-1 molecular sieve were ball-milled for 3 hours to obtain phosphotungstic acid-modified ZMQ-1 molecular sieve.

[0042] Step 3: Prepare the composite adhesive;

[0043] Add 20 parts of silica sol and 5 parts of molybdenum trioxide powder to the reaction vessel, and then stir at 150 rpm. Add 3 parts of dispersant BYK111, 2.1 parts of defoamer BYK055 and 1.2 parts of leveling agent BYK1790 in sequence, stir for 20 minutes, and obtain the composite adhesive after stirring evenly.

[0044] Step 4: Mix phosphotungstic acid modified ZMQ-1 molecular sieve, composite binder and water in a mass ratio of 5:6:22 and beat for 40 minutes to obtain the first slurry;

[0045] Step 5: Mix the first slurry (mass ratio 4:7) and the metal salt aqueous solution and beat for 40 minutes to obtain the second slurry;

[0046] The aqueous solution of the metal salt is sodium nitrate;

[0047] Step 6: After grinding the second slurry, spray dry it at 400℃ and calcine it at 600℃ for 2 hours to obtain the catalytic cracking catalyst.

[0048] The ZMQ-1 molecular sieve was prepared using CN118515294A; this ZMQ-1 molecular sieve contains a three-dimensional channel system composed of 28×10×10-membered rings, wherein the 28MR rings have a size of [missing information]. It has reached the mesoporous size range. This is the first structurally stable ZMQ-1 molecular sieve with intrinsic mesopores. This molecular sieve exhibits high thermal and hydrothermal stability, abundant Brønsted acid sites, and medium-to-high Brønsted acid strength. When applied to heavy oil catalytic cracking reactions, this molecular sieve demonstrates higher catalytic activity and unique product selectivity compared to industrially produced ultrastable Y molecular sieves.

[0049] Example 2: This example provides a catalytic cracking catalyst, comprising the following steps:

[0050] Step 1: Prepare homogenized phosphotungstic acid;

[0051] S1: Mix 1 part of phosphotungstic acid preheated to 40℃, 2 parts of dispersant, 0.4 parts of co-dispersant and 100 parts of water, and stir at 3000 rpm for 15 min under light-protected conditions to obtain a dispersion.

[0052] The dispersant is a mixture of butyl acrylate, methyl ethyl ketone, and cellulose acetate in a mass ratio of 1.5:0.8:1.2.

[0053] The dispersant is dimethyl silicone oil;

[0054] S2: Freeze-drying removes water from the dispersion to obtain dispersed powder, which is then pulverized at 700 rpm for 2 minutes using an ultra-micro pulverizer to obtain ultra-micro dispersed powder.

[0055] S3: After vacuum sealing and packaging the ultra-micro dispersed powder, place it in the inner cavity of an ultra-high pressure equipment and hold it under pressure of 300MPa for 10 minutes to obtain homogenized phosphotungstic acid;

[0056] Step 2: Combine homogenized phosphotungstic acid with ZMQ-1 molecular sieve;

[0057] 1.5 parts of homogenized phosphotungstic acid and 90 parts of ZMQ-1 molecular sieve were ball-milled for 2 hours to obtain phosphotungstic acid modified ZMQ-1 molecular sieve.

[0058] Step 3: Prepare the composite adhesive;

[0059] Add 15 parts of silica sol and 3 parts of molybdenum trioxide powder to the reaction vessel, and then stir at 100 rpm. Add 1 part of dispersant BYK111, 0.8 parts of defoamer BYK055 and 0.6 parts of leveling agent BYK1790 in sequence, stir for 15 minutes, and obtain the composite adhesive after stirring evenly.

[0060] Step 4: Mix phosphotungstic acid modified ZMQ-1 molecular sieve, composite binder and water in a mass ratio of 1:4:12 and beat for 20 minutes to obtain the first slurry;

[0061] Step 5: Mix the first slurry (mass ratio 2:4) and the metal salt aqueous solution and beat for 20 minutes to obtain the second slurry;

[0062] The aqueous solution of the metal salt is ammonium nitrite;

[0063] Step 6: After grinding the second slurry, spray dry it at 300℃ and calcine it at 540℃ for 1 hour to obtain the catalytic cracking catalyst.

[0064] Example 3: This example provides a catalytic cracking catalyst, comprising the following steps:

[0065] Step 1: Prepare homogenized phosphotungstic acid;

[0066] S1: Mix 1.5 parts of phosphotungstic acid preheated to 43°C, 3 parts of dispersant, 0.7 parts of co-dispersant and 130 parts of water, and stir at 3600 rpm for 18 minutes in the dark using a high-speed homogenizer to obtain a dispersion.

[0067] The dispersant is a mixture of butyl acrylate, methyl ethyl ketone, and cellulose acetate in a mass ratio of 2.1:1.3:1.5.

[0068] The dispersant is calcium sulfate powder;

[0069] S2: Freeze-drying removes water from the dispersion to obtain a dispersed powder, which is then pulverized in an ultra-micro pulverizer at 720 rpm for 3 minutes to obtain an ultra-micro dispersed powder.

[0070] S3: After vacuum sealing and packaging the ultra-micro dispersed powder, place it in the inner cavity of an ultra-high pressure equipment and hold it under pressure of 360MPa for 13 minutes to obtain homogenized phosphotungstic acid;

[0071] Step 2: Combine homogenized phosphotungstic acid with ZMQ-1 molecular sieve;

[0072] Five parts of homogenized phosphotungstic acid and 95 parts of ZMQ-1 molecular sieve were ball-milled for 3 hours to obtain phosphotungstic acid-modified ZMQ-1 molecular sieve.

[0073] Step 3: Prepare the composite adhesive;

[0074] Add 17 parts of silica sol and 4 parts of molybdenum trioxide powder to the reaction vessel, and then stir at 120 rpm. Add 2 parts of dispersant BYK111, 1.8 parts of defoamer BYK055 and 0.9 parts of leveling agent BYK1790 in sequence, stir for 17 minutes, and obtain the composite adhesive after stirring evenly.

[0075] Step 4: Mix phosphotungstic acid modified ZMQ-1 molecular sieve, composite binder and water in a mass ratio of 3:5:18 and beat for 25 minutes to obtain the first slurry;

[0076] Step 5: Mix the first slurry (mass ratio 3:5) and the metal salt aqueous solution and beat for 35 minutes to obtain the second slurry;

[0077] The aqueous solution of the metal salt is ferric sulfate;

[0078] Step 6: After grinding the second slurry, spray dry it at 340°C and calcine it at 580°C for 2 hours to obtain the catalytic cracking catalyst.

[0079] Comparative Example 1: The difference between this comparative example and the embodiment is that the phosphotungstic acid was not homogenized.

[0080] This comparative example provides a catalytic cracking catalyst, comprising the following steps:

[0081] Step 1: Combine phosphotungstic acid with ZMQ-1 molecular sieve;

[0082] Five parts of phosphotungstic acid and 95 parts of ZMQ-1 molecular sieve were ball-milled for 3 hours to obtain phosphotungstic acid-modified ZMQ-1 molecular sieve.

[0083] Step 2: Prepare the composite adhesive;

[0084] Add 17 parts of silica sol and 4 parts of molybdenum trioxide powder to the reaction vessel, and then stir at 120 rpm. Add 2 parts of dispersant BYK111, 1.8 parts of defoamer BYK055 and 0.9 parts of leveling agent BYK1790 in sequence, stir for 17 minutes, and obtain the composite adhesive after stirring evenly.

[0085] Step 3: Mix phosphotungstic acid modified ZMQ-1 molecular sieve, composite binder and water in a mass ratio of 3:5:18 and beat for 25 minutes to obtain the first slurry;

[0086] Step 4: Mix the first slurry (mass ratio 3:5) and the metal salt aqueous solution and beat for 35 minutes to obtain the second slurry;

[0087] The aqueous solution of the metal salt is ferric sulfate;

[0088] Step 5: After grinding the second slurry, spray dry it at 340℃ and calcine it at 580℃ for 2 hours to obtain the catalytic cracking catalyst.

[0089] Comparative Example 2: The difference between this comparative example and Example 3 is that this comparative example uses a conventional adhesive.

[0090] This comparative example provides a catalytic cracking catalyst, comprising the following steps:

[0091] Step 1: Prepare homogenized phosphotungstic acid;

[0092] S1: Mix 1.5 parts of phosphotungstic acid preheated to 43°C, 3 parts of dispersant, 0.7 parts of co-dispersant and 130 parts of water, and stir at 3600 rpm for 18 minutes in the dark using a high-speed homogenizer to obtain a dispersion.

[0093] The dispersant is a mixture of butyl acrylate, methyl ethyl ketone, and cellulose acetate in a mass ratio of 2.1:1.3:1.5.

[0094] The dispersant is calcium sulfate powder;

[0095] S2: Freeze-drying removes water from the dispersion to obtain a dispersed powder, which is then pulverized in an ultra-micro pulverizer at 720 rpm for 3 minutes to obtain an ultra-micro dispersed powder.

[0096] S3: After vacuum sealing and packaging the ultra-micro dispersed powder, place it in the inner cavity of an ultra-high pressure equipment and hold it under pressure of 360MPa for 13 minutes to obtain homogenized phosphotungstic acid;

[0097] Step 2: Combine homogenized phosphotungstic acid with ZMQ-1 molecular sieve;

[0098] Five parts of homogenized phosphotungstic acid and 95 parts of ZMQ-1 molecular sieve were ball-milled for 3 hours to obtain phosphotungstic acid-modified ZMQ-1 molecular sieve.

[0099] Step 3: Prepare the adhesive;

[0100] Add 17 parts of silica sol to the reaction vessel, and then stir at 120 rpm for 17 minutes. After stirring evenly, the adhesive is obtained.

[0101] Step 4: Mix phosphotungstic acid modified ZMQ-1 molecular sieve, binder and water in a mass ratio of 3:5:18 and beat for 25 minutes to obtain the first slurry;

[0102] Step 5: Mix the first slurry (mass ratio 3:5) and the metal salt aqueous solution and beat for 35 minutes to obtain the second slurry;

[0103] The aqueous solution of the metal salt is ferric sulfate;

[0104] Step 6: After grinding the second slurry, spray dry it at 340°C and calcine it at 580°C for 2 hours to obtain the catalytic cracking catalyst.

[0105] Comparative Example 3: The difference between this comparative example and Example 3 is that this comparative example uses a conventional adhesive and does not perform homogenization treatment on the phosphotungstic acid.

[0106] This comparative example provides a catalytic cracking catalyst, comprising the following steps:

[0107] Step 1: Combine phosphotungstic acid with ZMQ-1 molecular sieve;

[0108] Five parts of phosphotungstic acid and 95 parts of ZMQ-1 molecular sieve were ball-milled for 3 hours to obtain phosphotungstic acid-modified ZMQ-1 molecular sieve.

[0109] Step 2: Prepare the adhesive;

[0110] Add 17 parts of silica sol to the reaction vessel, and then stir at 120 rpm for 17 minutes. After stirring evenly, the adhesive is obtained.

[0111] Step 3: Mix phosphotungstic acid modified ZMQ-1 molecular sieve, binder and water in a mass ratio of 3:5:18 and beat for 25 minutes to obtain the first slurry;

[0112] Step 4: Mix the first slurry (mass ratio 3:5) and the metal salt aqueous solution and beat for 35 minutes to obtain the second slurry;

[0113] The aqueous solution of the metal salt is ferric sulfate;

[0114] Step 5: After grinding the second slurry, spray dry it at 340℃ and calcine it at 580℃ for 2 hours to obtain the catalytic cracking catalyst.

[0115] Experimental example: The effects of the catalysts prepared in Examples 1-3 and Comparative Examples 1-3 were tested.

[0116] The catalyst was loaded into the reactor of a small fixed fluidized bed reactor device, and the feedstock oil was subjected to catalytic cracking reaction. The test results are shown in Table 1:

[0117] Table 1

[0118]

[0119] As shown in the table above, homogenization of phosphotungstic acid and compound treatment with binders can effectively improve the conversion rate and increase the concentration of propylene in liquefied petroleum gas. The combination of the two will have a synergistic effect on improving the conversion rate and propylene concentration.

[0120] Furthermore, it is worth noting that the catalytic cracking catalyst prepared by this invention can be directly applied to the catalytic cracking reaction of feedstock oil at a reaction temperature of 480°C, achieving the above-mentioned effects, saving resources, and reducing production costs.

[0121] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A phosphotungstic acid-modified ZMQ-1 molecular sieve, characterized in that, The phosphotungstic acid modified ZMQ-1 molecular sieve is obtained by ball milling 1.5-8 parts of homogenized phosphotungstic acid with 90-100 parts of ZMQ-1 molecular sieve for 2-3 hours. The method for preparing the homogenized phosphotungstic acid includes the following steps: S1: Mix 1-3 parts of phosphotungstic acid preheated to 40-45℃, 2-4 parts of dispersant, 0.4-0.8 parts of co-dispersant and 100-150 parts of water, and stir the mixture for 15-20 minutes at 3000-4000 rpm using a high-speed homogenizer under light-protected conditions to obtain a dispersion. The dispersant is a mixture of butyl acrylate, butanone, and cellulose acetate in a mass ratio of 1.5-2.4:0.8-1.7:1.2-1.

8. S2: Freeze-dry to remove water from the dispersion to obtain dispersed powder, and then pulverize it in an ultra-micro pulverizer at a speed of 700-800 rpm for 2-5 minutes to obtain ultra-micro dispersed powder. S3: After vacuum sealing and packaging the ultra-micro dispersed powder, place it in the inner cavity of an ultra-high pressure equipment and hold it under pressure of 300-400MPa for 10-15 minutes to obtain homogenized phosphotungstic acid.

2. The phosphotungstic acid-modified ZMQ-1 molecular sieve according to claim 1, characterized in that, The dispersant is one of dimethyl silicone oil, calcium carbonate powder, or calcium sulfate powder.

3. A catalytic cracking catalyst, characterized in that, The ZMQ-1 molecular sieve is modified with phosphotungstic acid as described in any one of claims 1-2, and also includes a composite binder and water; The preparation method of catalytic cracking catalyst includes the following steps: Step 1: Prepare the composite adhesive; Add silica sol and molybdenum trioxide powder to the reaction vessel and stir. Then add dispersant, defoamer and leveling agent in sequence. After stirring evenly, a composite adhesive is obtained. Step 2: Mix the ZMQ-1 molecular sieve modified with phosphotungstic acid as described in any one of claims 1-2, the composite binder, and water to obtain the first slurry; Step 3: Mix the first slurry and the metal salt aqueous solution and beat them to obtain the second slurry; Step 4: After grinding the second slurry, spray dry and calcinate it to obtain the catalytic cracking catalyst.

4. The catalytic cracking catalyst according to claim 3, characterized in that, Step one is as follows: Add 15-20 parts of silica sol and 3-5 parts of molybdenum trioxide powder to the reaction vessel, and then stir at a speed of 100-150 rpm. Add 1-3 parts of dispersant, 0.8-2.1 parts of defoamer, and 0.6-1.2 parts of leveling agent in sequence, and stir for 15-20 minutes. After stirring evenly, a composite adhesive is obtained.

5. The catalytic cracking catalyst according to claim 4, characterized in that, In step one, the dispersant is BYK111, the defoamer is BYK055, and the leveling agent is BYK1790.

6. The catalytic cracking catalyst according to claim 5, characterized in that, Step two specifically involves mixing phosphotungstic acid-modified ZMQ-1 molecular sieve, composite binder, and water in a mass ratio of 1-5:4-6:12-22 and then pulping for 20-40 minutes to obtain the first slurry.

7. The catalytic cracking catalyst according to claim 6, characterized in that, Step 3 specifically involves mixing the first slurry (mass ratio 2-4:4-7) with the metal salt aqueous solution and beating for 20-40 minutes to obtain the second slurry.

8. The catalytic cracking catalyst according to claim 7, characterized in that, The metal salt aqueous solution is one of sodium nitrate aqueous solution, ammonium nitrite aqueous solution, ferric sulfate aqueous solution, and sodium bisulfite aqueous solution.

9. The catalytic cracking catalyst according to claim 8, characterized in that, Step four specifically involves grinding the second slurry and then spray-drying it at 300-400℃, followed by calcination at 540-600℃ for 1-2 hours to obtain the catalytic cracking catalyst.

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