A pseudo-boehmite and a method for preparing and using the same

Abstract

The preparation method of pseudo-boehmite provided by the application innovatively adds a biological macromolecular template agent in the pseudo-boehmite slurry after neutralizing the sodium metaaluminate solution with acid, so that a micrometer-sized large pore is formed in the pseudo-boehmite crystal grain; when the pseudo-boehmite is prepared into a catalyst carrier, the micrometer-sized large pore is converted into a hundred nanometer-sized large pore; meanwhile, the biological macromolecular template agent is replaced and removed by adding a washing agent during the washing process of the pseudo-boehmite; and no organic pore-expanding agent is added during the extrusion molding of the pseudo-boehmite, so that the cohesiveness of the pseudo-boehmite (i.e. the connectivity between the pseudo-boehmite powder particles) is not affected. Compared with the existing pseudo-boehmite, the pseudo-boehmite prepared by the method has a higher specific surface area, a larger pore volume, and a bimodal distribution of the pore size, which presents a nanometer-sized mesopore and a micrometer-sized large pore; and the catalyst carrier prepared from the pseudo-boehmite has a higher strength and is suitable for an upflow bed, a moving bed and a fluidized bed and the like operating environment.

Description

Technical Field

[0001] This invention relates to the field of preparation of catalyst supports for petroleum refining hydrogenation, and mainly to a pseudoboehmite, its preparation method, and its application. Background Technology

[0002] Phobospore (γ-AlOOH) is an incompletely crystallized alumina hydrate containing water of crystallization. Its surface features an irregular porous structure and sites for Lewis and Bronsted acids, making it widely used in catalysis. In recent years, my country's petrochemical industry has faced severe challenges such as heavier and lower-quality crude oil and higher costs. This necessitates catalyst supports with a bimodal distribution of micron-sized macropores and nano-sized mesopores. Macropores are used to accommodate impurities removed from the oil, while mesopores are used for catalytic hydroremoval reactions. Simultaneously, sufficient strength is required to prevent catalyst bed breakage.

[0003] Catalyst supports are primarily prepared by extruding a homogeneous mixture of boehmite powder and acid water. The surface of the boehmite powder becomes sticky after being dissolved in acid water, allowing them to bond together during extrusion to form the support. The strength of the catalyst mainly depends on the tightness of the bonding between the boehmite powder particles. Poor boehmite viscosity or the presence of other substances will lead to a decrease in the strength of the catalyst support. Currently, the production of micron-sized macroporous refining catalyst supports typically involves adding organic pore expanders during the mixing of boehmite powder and acid water. However, these organic pore expanders affect the bonding between boehmite powder particles, resulting in consistently low catalyst support strength, making them unsuitable for use in upflow beds, moving beds, or fluidized bed environments.

[0004] For example, Chinese patent document CN109928412A discloses a two-stage continuous synthesis reaction. During the preparation process, an organic template agent is added to form pseudo-boehmite crystals of uniform particle size. This process eliminates the aging step and improves the viscosity of the mesoporous pseudo-boehmite, thereby increasing the strength of the catalyst support. However, this method does not produce micron-sized macropores, nor does it generate a bimodal distribution of micron-sized macropores and nano-sized mesopores. Therefore, it cannot be directly used to prepare heavy oil hydrogenation catalyst supports. Instead, an organic pore-expanding agent needs to be added during the support forming stage to form micron-sized macropores, which also results in low support strength.

[0005] Chinese patent document CN1250746A discloses a method for preparing mesoporous pseudoboehmite by neutralizing sodium aluminate with carbon dioxide to form a gel. The method mainly involves dividing the gelation reaction into two steps. In the first step, the final pH value is controlled at 6.0-9.5, the temperature at 10-100℃, and the gelation time is controlled within 40 minutes. In the second step, an alkaline pore-expanding agent is added, and the pH is raised to above 9.5, followed by rapid solid-liquid separation. This method only increases the mesoporous pore volume of pseudoboehmite prepared by gas-liquid two-phase gelation; it does not produce micron-sized macropores. Similarly, an organic pore-expanding agent needs to be added during the carrier forming stage to prepare a carrier with a bimodal distribution of micron-sized macropores and nano-sized mesopores, which also results in low carrier strength. Summary of the Invention

[0006] In view of this, the present invention provides a pseudoboehmite, its preparation method and application. The pseudoboehmite contains micron-sized macropores and nano-sized mesopores. When the pseudoboehmite is used to prepare a catalyst support, the micron-sized macropores are transformed into hundred-nanometer-sized macropores, and the resulting support has high strength and is suitable for operating environments such as upflow beds, moving beds and fluidized beds.

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

[0008] A pseudoboehmite, wherein the pseudoboehmite has micron-sized macropores and nano-sized mesopores with a bimodal pore size distribution, wherein the probable pore size of the micron-sized macropores is 100-10000 nm, and the probable pore size of the nano-sized mesopores is 5-15 nm.

[0009] This invention also provides a method for preparing pseudoboehmite, comprising the following steps:

[0010] A mixture of sodium aluminate solution and template agent is mixed with acid to undergo a neutralization and gelation reaction, yielding a pseudoboehmite slurry; after separation, washing with a detergent, and drying, pseudoboehmite is obtained.

[0011] The template agent is selected from water-soluble proteins, water-soluble nucleic acids or their salts, and the molecular length is greater than 100 nm.

[0012] Among them, "easily soluble in water" means that the template agent dissolves in more than 200g of water per liter within the range of 20-80℃; and "molecular length" refers to the distance between the farthest atoms in a molecule, which is calculated by measuring the length of the basic unit amino acid or nucleotide and the number of basic units.

[0013] In one alternative embodiment, the template agent is selected from catalase (CAT) or sodium ribonucleic acid (RNA-Na), preferably catalase (CTA).

[0014] In one optional embodiment, the sodium aluminate solution, calculated as alumina, has a mass ratio of the template agent to the sodium aluminate solution of (5-20):100. Examples include: 5:100, 6:100, 7:100, 8:100, 9:100, 10:100, 11:100, 12:100, 13:100, 14:100, 15:100, 16:100, 17:100, 18:100, 19:100, and 20:100. Other unlisted values ​​within this range are also applicable, with (10-20):100 being preferred.

[0015] In one optional embodiment, the caustic ratio of the sodium aluminate solution is 0.8-2.0. For example, 0.8, 0.9, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, but not limited to the listed values. Other unlisted values ​​within this range are also applicable, with 1.0-1.6 being preferred.

[0016] In one optional embodiment, the concentration of the sodium aluminate solution, calculated as alumina, is 10–60 g / L. Examples include 10 g / L, 15 g / L, 20 g / L, 25 g / L, 30 g / L, 35 g / L, 40 g / L, 50 g / L, and 60 g / L, but the concentration is not limited to these listed values; other unlisted values ​​within this range are also applicable, with 20–40 g / L being preferred.

[0017] In one alternative embodiment, the acid is selected from inorganic acids, specifically at least one selected from sulfuric acid, hydrochloric acid, nitric acid, and carbonic acid. Sulfuric acid is preferred; the concentration of the sulfuric acid is ≥25%, for example, 25%, 30%, 40%, 50%, 60%, 70%, 80%, or 90%, but not limited to the listed values; other unlisted values ​​within this range are also applicable. Preferably, the concentration of the sulfuric acid is >60%.

[0018] In one optional embodiment, the temperature of the neutralization and gelation reaction is 50-95°C. For example, 50°C, 55°C, 60°C, 65°C, 70°C, 80°C, 90°C, 95°C, but not limited to the listed values, other unlisted values ​​within this range are also applicable, preferably 60-75°C.

[0019] In one optional embodiment, the pH of the system is 6.5–10.5 at the end of the neutralization gelation reaction. For example, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, but not limited to the listed values. Other unlisted values ​​within this range are also applicable. Preferably, the pH of the system is 7.0–8.5 at the end of the neutralization reaction.

[0020] In one optional embodiment, the neutralization and gelation reaction is carried out under stirring at a speed of 100-1000 rpm. Examples include 100 rpm, 200 rpm, 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, 900 rpm, and 1000 rpm, but are not limited to the listed values; other unlisted values ​​within this range are also applicable, with 400-600 rpm being preferred.

[0021] In an optional embodiment, prior to the separation step, an aging step is included in which the pseudo-boehmite slurry is aged; preferably, the aging temperature is 50-95°C and the time is ≤4h. For example, 0.1h, 0.2h, 0.5h, 1h, 2h, 3h, 4h, but not limited to the listed values, other unlisted values ​​within this range are also applicable, preferably the aging time is ≤1h.

[0022] In one optional embodiment, the detergent is selected from an aqueous solution of an ammonium salt, wherein the ammonium salt is selected from at least one of ammonium bicarbonate, ammonium carbonate, ammonium sulfate, and ammonium chloride, preferably ammonium bicarbonate.

[0023] In one optional embodiment, the concentration of the aqueous solution of the ammonium salt is 0.5-5 g / L. For example, 0.5 g / L, 1 g / L, 2 g / L, 3 g / L, 4 g / L, 5 g / L, but not limited to the listed values. Other unlisted values ​​within this range are also applicable. Preferably, the concentration of the aqueous solution of the ammonium salt is 1-2 g / L.

[0024] In one optional embodiment, the washing temperature of the detergent is 20-60°C, such as 20°C, 30°C, 40°C, 45°C, 50°C, 55°C, 60°C, but not limited to the listed values. Other unlisted values ​​within this range are also applicable, with 50-60°C being preferred.

[0025] In one optional embodiment, the washing aid is applied 1-5 times, for example, 1 time, 2 times, 3 times, 4 times, or 5 times, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable. Preferably, the washing aid is applied 3-4 times.

[0026] In one optional embodiment, the drying temperature is 100-250°C. For example, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C, 160°C, 220°C, 230°C, 240°C, but not limited to the listed values; other unlisted values ​​within this range are also applicable.

[0027] The present invention also provides the application of the above-mentioned boehmite or the boehmite prepared by the above-mentioned method in the preparation of catalysts.

[0028] The present invention also provides a catalyst support, wherein the catalyst support is prepared by acid water sol-gel, molding, drying and calcining of the pseudoboehmite prepared by the above-mentioned method.

[0029] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0030] The present invention provides an innovative method for preparing boehmite by adding a biomolecular template agent to a sodium aluminate solution, followed by acid neutralization to obtain a boehmite slurry. This process creates micron-sized macropores between the crystals within the boehmite particles. During catalyst support preparation, these micron-sized macropores transform into nanometer-sized macropores under mechanical pressure. Simultaneously, during the boehmite washing process, a washing aid displaces the biomolecular template agent within the boehmite particles, removing it completely. No organic pore-expanding agent is added during boehmite extrusion molding, thus preserving the boehmite's adhesiveness (i.e., maintaining the connectivity between boehmite powder particles). Compared to existing boehmite, the boehmite prepared by this method exhibits a higher specific surface area, larger pore volume, and a bimodal pore size distribution of nanometer-sized mesopores and micron-sized macropores. Furthermore, the catalyst support made from this boehmite possesses high strength, making it suitable for operating environments such as upflow beds, moving beds, and fluidized beds. The residue hydrotreating catalyst made from this pseudoboehmite not only has a better ability to contain impurities, but also has higher strength.

[0031] The method for preparing pseudoboehmite provided by this invention is simple, operates under mild conditions, and is environmentally friendly. In addition, it offers advantages such as rapid reaction, short cycle time, ease of operation, reduced water consumption, and reduced energy waste, demonstrating promising prospects for industrial application. Detailed Implementation

[0032] The present invention will now be described in detail through embodiments. It should be noted that the following embodiments are only for further illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the content of the present invention.

[0033] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0034] For ease of comparison, the same aqueous acetic acid solution was used as the binder in all the following carrier preparation processes; other binders are also applicable.

[0035] Commercially available CAT and RNA-Na, which are easily soluble in water and have a molecular length greater than 100 nm, can both meet the requirements for implementing the technical solution of this invention.

[0036] Example 1

[0037] Under continuous stirring conditions at 75℃ and 300rpm, the stencil agent CTA was mixed with a sodium aluminate solution with a caustic ratio of 0.8 (the sodium aluminate solution was calculated as alumina, the concentration of the sodium aluminate solution was 50g / L, and the mass ratio of the stencil agent to the sodium aluminate solution was 5:100). Then, sulfuric acid solution was slowly added dropwise at 75℃ to neutralize and gel the reaction until the pH of the reaction system was 6.5, thus obtaining a pseudo-boehmite slurry.

[0038] The pseudoboehmite slurry was aged at 75°C for 1 hour under stirring. After filtration and washing twice with 1 g / L ammonium carbonate solution at 40°C, it was dried at 150°C to obtain pseudoboehmite.

[0039] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0040] Example 2

[0041] Under continuous stirring conditions at 75℃ and 800rpm, the stencil agent CTA was mixed with a sodium aluminate solution with a caustic ratio of 2.0 (the sodium aluminate solution was calculated as alumina, the concentration of the sodium aluminate solution was 20g / L, and the mass ratio of the stencil agent to the sodium aluminate solution was 10:100). Then, sulfuric acid solution was slowly added dropwise at 60℃ to neutralize and gel the reaction until the pH of the reaction system was 7.5, thus obtaining a pseudo-boehmite slurry.

[0042] The pseudoboehmite slurry was aged at 50°C for 4 hours under stirring. After filtration and washing twice with 2 g / L ammonium chloride solution at 30°C, it was dried at 150°C to obtain pseudoboehmite.

[0043] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0044] Example 3

[0045] Under continuous stirring conditions at 75℃ and 100rpm, the template agent RNA-Na was mixed with a sodium aluminate solution with a caustic ratio of 1.0 (the sodium aluminate solution was calculated as alumina, the concentration of the sodium aluminate solution was 40g / L, and the mass ratio of the template agent to the sodium aluminate solution was 20:100). Then, a carbonic acid solution was slowly added dropwise at 85℃ to neutralize and gel the reaction until the pH of the reaction system was 10.5, thus obtaining a pseudo-boehmite slurry.

[0046] The pseudoboehmite slurry was aged at 85°C for 2 hours under stirring. Then it was filtered, washed three times with 3 g / L ammonium sulfate solution at 20°C, and dried at 220°C to obtain pseudoboehmite.

[0047] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0048] Example 4

[0049] Under continuous stirring at 75℃ and 1000rpm, the template agent RNA-Na was mixed with a sodium aluminate solution with a caustic ratio of 1.5 (the sodium aluminate solution was calculated as alumina, the concentration of the sodium aluminate solution was 10g / L, and the mass ratio of the template agent to the sodium aluminate solution was 5:100). Then, nitric acid solution was slowly added dropwise at 95℃ to neutralize and gel the reaction until the pH of the reaction system was 9, thus obtaining a pseudo-boehmite slurry.

[0050] The pseudoboehmite slurry was aged at 95°C for 1 hour under stirring. After filtration and washing once with 5 g / L ammonium bicarbonate solution at 60°C, it was dried at 100°C to obtain pseudoboehmite.

[0051] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0052] Example 5

[0053] Under continuous stirring conditions at 75℃ and 500rpm, the stencil agent CTA was mixed with a sodium aluminate solution with a caustic ratio of 1.2 (the sodium aluminate solution was calculated as alumina, the concentration of the sodium aluminate solution was 60g / L, and the mass ratio of the stencil agent to the sodium aluminate solution was 15:100). Then, hydrochloric acid solution was slowly added dropwise at 50℃ to neutralize and gel the reaction until the pH of the reaction system was 8, thus obtaining a pseudo-boehmite slurry.

[0054] The pseudoboehmite slurry was then filtered, washed five times with a 0.5 g / L ammonium carbonate solution at 50°C, and dried at 150°C to obtain pseudoboehmite.

[0055] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0056] Comparative Example 1

[0057] This comparative example is similar to Example 1, except that no template agent was added when preparing the pseudoboehmite, while a template agent was added when preparing the carrier. The specific process includes the following steps:

[0058] Under continuous stirring at 75℃ and 300rpm, sulfuric acid solution was slowly added dropwise to a sodium aluminate solution with a caustic ratio of 0.8 (sodium aluminate solution with a concentration of 50g / L based on alumina) to neutralize and gel the mixture until the pH of the reaction system reached 6.5, thus obtaining a pseudo-boehmite slurry.

[0059] The pseudoboehmite slurry was aged at 75°C for 1 hour under stirring. After filtration and washing twice with 1 g / L ammonium carbonate solution at 40°C, it was dried at 150°C to obtain pseudoboehmite.

[0060] The above-mentioned boehmite, template agent CTA (sodium aluminate solution based on alumina, with a mass ratio of template agent to sodium aluminate solution of 5:100), and acetic acid aqueous solution with a concentration of 5wt% were mixed in a mass ratio of 1:1, kneaded and extruded into strip-shaped catalyst support.

[0061] Comparative Example 2

[0062] This comparative example is similar to Example 1, except that no template agent was added when preparing the pseudoboehmite. The specific process includes the following steps:

[0063] Under continuous stirring at 75℃ and 300rpm, sulfuric acid solution was slowly added dropwise to a sodium aluminate solution with a caustic ratio of 0.8 (sodium aluminate solution with a concentration of 50g / L based on alumina) to neutralize and gel the mixture until the pH of the reaction system reached 6.5, thus obtaining a pseudo-boehmite slurry.

[0064] The pseudoboehmite slurry was aged at 75°C for 1 hour under stirring. After filtration and washing twice with 1 g / L ammonium carbonate solution at 40°C, it was dried at 150°C to obtain pseudoboehmite.

[0065] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0066] Comparative Example 3

[0067] This comparative example is similar to Example 1, except that triethanolamine is used instead of CTA as the template agent in this invention when preparing pseudoboehmite. The specific process includes the following steps:

[0068] Under continuous stirring conditions at 75℃ and 300rpm, the template agent triethanolamine was mixed with a sodium aluminate solution with a caustic ratio of 0.8 (the sodium aluminate solution was calculated as alumina, the concentration of the sodium aluminate solution was 50g / L, and the mass ratio of triethanolamine to sodium aluminate solution was 5:100). Then, sulfuric acid solution was slowly added dropwise at 75℃ to neutralize and gel the reaction until the pH of the reaction system was 6.5, thus obtaining a pseudo-boehmite slurry.

[0069] The pseudoboehmite slurry was aged at 75°C for 1 hour under stirring. After filtration and washing twice with 1 g / L ammonium carbonate solution at 40°C, it was dried at 150°C to obtain pseudoboehmite.

[0070] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0071] Comparative Example 4

[0072] This comparative example is similar to Example 1, except that non-volatile starch is used instead of the template agent CTA in the present invention when preparing the pseudoboehmite. The specific process includes the following steps:

[0073] Under continuous stirring conditions at 75℃ and 300rpm, starch was mixed with a sodium aluminate solution with a caustic ratio of 0.8 (the sodium aluminate solution was calculated as alumina, the concentration of the sodium aluminate solution was 50g / L, and the mass ratio of starch to sodium aluminate solution was 5:100). Then, sulfuric acid solution was slowly added dropwise at 75℃ to neutralize and gel the reaction until the pH of the reaction system was 6.5, thus obtaining a pseudo-boehmite slurry.

[0074] The pseudoboehmite slurry was aged at 75°C for 1 hour under stirring. After filtration and washing twice with 1 g / L ammonium carbonate solution at 40°C, it was dried at 150°C to obtain pseudoboehmite.

[0075] The above-mentioned pseudoboehmite was mixed with a 5wt% aqueous acetic acid solution at a mass ratio of 1:1, and then kneaded and extruded into a strip-shaped catalyst support.

[0076] Comparative Example 5

[0077] This comparative example is similar to Example 1, except that no template agent was added when preparing the pseudoboehmite, and a pore-expanding agent was added when preparing the carrier. The specific process includes the following steps:

[0078] Under continuous stirring at 75℃ and 300rpm, sulfuric acid solution was slowly added dropwise to a sodium aluminate solution with a caustic ratio of 0.8 (sodium aluminate solution with a concentration of 50g / L based on alumina) to neutralize and gel the mixture until the pH of the reaction system reached 6.5, thus obtaining a pseudo-boehmite slurry.

[0079] The pseudoboehmite slurry was aged at 75°C for 1 hour under stirring. After filtration and washing twice with 1 g / L ammonium carbonate solution at 40°C, it was dried at 150°C to obtain pseudoboehmite.

[0080] The above-mentioned boehmite, pore-expanding agent polyvinyl alcohol (sodium aluminate solution based on alumina, with a mass ratio of 5:100 between pore-expanding agent and sodium aluminate solution), and 5wt% acetic acid aqueous solution were mixed in a mass ratio of 1:1 and then kneaded and extruded into strip-shaped catalyst support.

[0081] Table 1. Detection results of boehmite and carrier

[0082]

[0083] From Table 1, we can conclude that:

[0084] As can be seen from the comparison between Example 1 and Comparative Example 1, both adding a biomolecular template agent during the boehmite preparation stage and adding a macromolecular template agent during the carrier forming stage can produce a carrier with a bimodal distribution of macropores and mesopores. However, the former has higher carrier strength, while the carrier obtained by adding a macromolecular template agent during the carrier forming stage has weaker strength and is not suitable for the operation environment of upflow bed, moving bed and fluidized bed.

[0085] Comparative Examples 2 and 3 show that pseudoboehmite containing micron-sized macropores cannot be prepared without adding a biomolecular template agent or by adding a traditional small molecule template agent.

[0086] As can be seen from the comparison between Example 1 and Comparative Example 4, adding a water-insoluble macromolecular template agent during the preparation stage of pseudoboehmite does not allow the template agent to function effectively, and macropores cannot be prepared.

[0087] As can be seen from the comparison between Example 1 and Comparative Example 5, although both the catalyst support prepared by the present invention and the catalyst support prepared by the conventional method have a bimodal distribution of micron-sized macropores and nano-sized mesopores, the former has higher strength. The support prepared by the conventional method has weaker strength and is not suitable for the operation environment of upflow bed, moving bed and fluidized bed.

[0088] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the claims of the present invention.

Claims

1. A pseudoboehmite, characterized in that, The pseudoboehmite contains micron-sized macropores and nano-sized mesopores with a bimodal pore size distribution. The possible pore size of the micron-sized macropores is 100-10000 nm, and the possible pore size of the nano-sized mesopores is 5-15 nm.

2. A method for preparing pseudoboehmite, characterized in that, Includes the following steps: A mixture of sodium aluminate solution and template agent is mixed with acid to undergo a neutralization and gelation reaction, yielding a pseudoboehmite slurry; after separation, washing with a detergent, and drying, pseudoboehmite is obtained. The template agent is selected from water-soluble proteins, water-soluble nucleic acids or their salts, with a molecular length greater than 100 nm.

3. The preparation method according to claim 2, characterized in that, The template agent is selected from catalase or ribonucleic acid.

4. The preparation method according to claim 2, characterized in that, The sodium aluminate solution is calculated based on alumina, and the mass ratio of the template agent to the sodium aluminate solution is (5-20):

100.

5. The preparation method according to claim 2, characterized in that, The caustic ratio of the sodium aluminate solution is 0.8-2.0; and / or The concentration of the sodium aluminate solution, calculated as alumina, is 10-60 g / L; and / or The acid is selected from inorganic acids, and the inorganic acid is selected from at least one of sulfuric acid, hydrochloric acid, nitric acid, and carbonic acid.

6. The preparation method according to claim 2, characterized in that, The temperature for the neutralization and gelation reaction is 50-95℃; and / or At the end of the neutralization and gelation reaction, the pH of the system is 6.5-10.5; and / or The neutralization and gelation reaction is carried out under stirring at a speed of 100-1000 rpm.

7. The preparation method according to claim 2, characterized in that, Before the separation step, the process also includes an aging step of the pseudo-boehmite slurry; preferably, the aging temperature is 50-95℃ and the time is ≤4h.

8. The preparation method according to claim 2, characterized in that, The detergent builder is selected from an aqueous solution of an ammonium salt, wherein the ammonium salt is selected from at least one of ammonium bicarbonate, ammonium carbonate, ammonium sulfate, and ammonium chloride; the concentration of the aqueous solution of the ammonium salt is 0.5-5 g / L; and / or The washing temperature of the detergent is 20-60℃, and the number of washes is 1-5.

9. The use of the boehmite according to claim 1 or the boehmite prepared by any one of claims 2-8 in the preparation of catalysts.

10. A catalyst support, characterized in that, The catalyst support is prepared by acid water sol-gel, molding, drying and calcination of boehmite prepared by the method of boehmite preparation according to claim 1 or any one of claims 2-8.

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