Alumina support, method for preparing the same and use thereof

Abstract

The application belongs to the technical field of catalyst carrier, and particularly relates to an alumina carrier and a preparation method and application thereof, which can be used for preparing a dehydrogenation catalyst, and the preparation method comprises the following steps: S1: adding an aluminum source into acid liquor for peptization to obtain an aluminum sol; S2: mixing the aluminum sol with a pore-expanding agent and an organic amine salt template agent, and adjusting pH to 4.0-6.0 to obtain a mixed sol; and S3: forming the mixed sol obtained in S2 into a sol wet ball through drop ball forming, and calcining to obtain the alumina carrier. The prepared alumina carrier has a strength greater than 45 N / particle, a most probable pore diameter greater than 30 nm, a specific surface area greater than 180 m 2 / g, an abrasion less than 0.1%, and a bulk density as low as <= 0.4 kg / L, and simultaneously has the performances of large pore diameter, high strength and low abrasion.

Description

Technical Field

[0001] This invention belongs to the field of catalyst support technology, specifically relating to an alumina support, its preparation method, and its application. Background Technology

[0002] Propylene is a crucial chemical raw material, with a price far exceeding that of propane, although propane reserves are far greater in nature. Converting propane into high-value-added propylene is a key technology for improving propane utilization efficiency and achieving efficient use of carbon-based energy, possessing broad practical prospects and significant economic benefits. Currently, the commonly used method is propane dehydrogenation to propylene (PDH) technology, which converts propane into propylene through catalytic dehydrogenation. This technology, based on a precious metal catalyst system supported on alumina, features low energy consumption and low emissions. Compared to traditional oil-based processes, it achieves higher target product yields and produces high-purity hydrogen as a byproduct, and has been recognized as an important pathway to reduce dependence on petroleum and industrial energy consumption.

[0003] However, in practical applications of PDH technology, alumina supports are required to possess both large pore size and high strength. Larger pore size is necessary to meet the requirements of catalytic dehydrogenation reactions, while insufficient strength leads to significant wear, making it difficult to apply in fluidized beds. Simultaneously, in actual production, there is a pursuit of lower alumina support packing density, as lower packing density translates to higher economic efficiency. For example, existing patent literature discloses a method for forming spherical alumina. First, an aluminum source is dissolved in water to obtain an aluminum hydroxide slurry, which is then acidified with acid. Urea and appropriate amounts of boehmite, solid oxides, or molecular sieves are then added to obtain an aluminum hydroxide sol. The aluminum hydroxide sol is then drop-formed into spherical shapes using an oil-ammonia column composed of alginate ammonia solution and an oil phase, followed by drying and calcination to obtain spherical alumina. The alumina support obtained using this method has a crushing strength greater than 35 N / particle, but its most probable pore size is around 10 nm, which cannot meet the requirements of catalytic dehydrogenation reactions. Existing patent literature also discloses a special alumina for high-purity lithium battery separators, which has high strength but a specific surface area of ​​only 3.5–6 m². 2 The low packing density (g / cm³) makes it difficult to disperse the noble metal active components, which affects the catalyst activity and selectivity. Furthermore, existing patent literature discloses an alumina support with a low packing density, ranging from 0.35 to 0.45 g / cm³. 3 However, due to limitations in strength and pore size, its packing density cannot be further reduced. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of existing alumina carriers that cannot simultaneously meet the requirements of high strength, large pore size and high specific surface area, thereby providing an alumina carrier, its preparation method and application.

[0005] To this end, the present invention provides the following technical solution.

[0006] The method for preparing the alumina support provided by the present invention includes the following steps:

[0007] S1: Add the aluminum source to the acid solution for gelation to obtain aluminum sol;

[0008] S2: Mix aluminum sol with pore-expanding agent and organic amine salt template agent, and adjust the pH to 4.0-6.0 to obtain mixed sol;

[0009] S3: The mixed sol obtained in S2 is formed by drop ball molding to obtain wet sol balls, which are then calcined to obtain an alumina carrier.

[0010] Preferably, the aluminum source accounts for 1 / 20 to 1 / 5 of the mass of the aluminum sol; the aluminum source includes one or more of metallic aluminum, aluminum hydroxide, aluminum oxide, boehmite, hydrated aluminum oxide, aluminum hydroxyaluminate, aluminum sulfate, sodium aluminate, aluminum chloride, aluminum nitrate, and aluminum isopropoxide.

[0011] Preferably, the mass concentration of the acid solution is 5% to 20%, and the acid used includes one or more of nitric acid, hydrochloric acid, and sulfuric acid.

[0012] Preferably, the mass of the pore-expanding agent added is 0.1% to 2% of the mass of the aluminum source.

[0013] Preferably, the organic amine salt template agent is added at a mass of 0.01% to 5% of the aluminum source mass.

[0014] Preferably, in step S2, the pH is adjusted to 4.5–5.0.

[0015] Preferably, step S2 further includes a stirring step after adjusting the pH.

[0016] Preferably, step S3 further includes washing and drying the sol-wet bulbs before calcination.

[0017] Preferably, in step S2, the stirring temperature is 40–90°C and the stirring time is 0.5–4 hours.

[0018] Preferably, in step S3, the drying temperature is 100-130°C and the drying time is 2-6 hours.

[0019] Preferably, in step S3, the calcination temperature is 450–1000℃ and the calcination time is 2–8 hours.

[0020] Preferably, the pore-expanding agent includes one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium citrate, and sodium tartrate.

[0021] Preferably, the organic amine salt template agent includes any one of benzyltriethylammonium hydroxide, tetraalkylammonium hydroxide, alkylammonium hydrogen sulfate, and tetraalkylammonium bromide.

[0022] Preferably, after step S3, a step of supporting a tin-containing compound is further included. The support for the tin-containing compound, after supporting the noble metal catalyst, can better exert the catalytic effect of the catalyst.

[0023] In the preparation method of the alumina support provided by the present invention, the tin-containing compound loaded onto the alumina support includes, but is not limited to, one or more of tin oxide, stannous chloride, and tin tetrachloride.

[0024] Optionally, the mass of the tin-containing compound loaded, in terms of elemental tin, is 0.1% to 0.5% of the mass of the aluminum source.

[0025] Preferably, the mass of the tin-containing compound loaded is 0.15% to 0.35% of the mass of the aluminum source, based on elemental tin.

[0026] Preferred methods for loading tin-containing compounds onto an alumina support include ultrasonic atomization, spraying, and direct impregnation.

[0027] Specifically, the step of loading a tin-containing compound onto an alumina support by ultrasonic atomization can be to disperse the tin-containing compound in a liquid, ultrasonically atomize it, and load it onto the surface of the alumina support; the liquid used includes one or more of water, ethanol, ethylene glycol, and propanol.

[0028] Preferably, after loading the tin-containing compound onto the alumina support using ultrasonic atomization, a vacuum drying step is also included.

[0029] Preferably, the ultrasonic atomization temperature is 40–60°C and the ultrasonic atomization rate is 60–150 mL / min.

[0030] Preferably, the vacuum drying temperature is 40–90°C, the vacuum drying time is 1–4 h, and the vacuum drying pressure is 0.001–0.06 MPa.

[0031] The present invention provides an alumina support prepared using the above-described preparation method.

[0032] The present invention also provides the application of the above-mentioned alumina support in the preparation of dehydrogenation catalysts.

[0033] In this invention, the composition and preparation method of the active component of the dehydrogenation catalyst are conventional in the field. Typically, without limitation, the active component includes at least one of platinum, rhodium, and palladium; the loading of the active component is 0.05% to 0.5%; the preparation method adopts the equal volume impregnation method, and the preparation steps and parameters include: impregnating the obtained alumina support in a metal solution with equal volume for 2 to 8 hours, drying for 2 to 6 hours, and then calcining at 350 to 900°C for 2 to 8 hours to obtain the dehydrogenation catalyst product.

[0034] The beneficial effects of this invention are:

[0035] The method for preparing an alumina support provided by this invention includes the following steps: S1: Adding an aluminum source to an acid solution for gelation to obtain an aluminum sol; S2: Mixing the aluminum sol with a pore-expanding agent and an organic amine salt template agent, adjusting the pH to 4.0–6.0 to obtain a mixed sol; S3: Forming the mixed sol obtained in S2 into wet sol pellets by drop pelleting, and calcining to obtain the alumina support. The prepared alumina support can achieve a strength greater than 45 N / particle, a most probable pore size greater than 30 nm, and a specific surface area greater than 180 m². 2 With a strength of / g and an abrasion rate of less than 0.1%, the bulk density can be as low as ≤0.4kg / L, exhibiting both large pore size and high strength with low abrasion. The addition of a pore-expanding agent effectively increases the most probable pore size of the alumina support while simultaneously reducing its bulk density. Organic amine salt template agents can control the pore size during further processing of the alumina sol to obtain a mixed sol. pH adjustment can improve the strength of the alumina support. When using the droplet forming method, the mixed sol shrinks into small spheres within the forming column due to its own surface tension, which also effectively improves the strength of the prepared alumina support and reduces the incorporation of impurities.

[0036] The method for preparing alumina carrier provided by the present invention includes a stirring step in step S2 after adjusting the pH, which can make the raw materials more uniformly mixed and accelerate the formation of mixed sol.

[0037] The method for preparing the alumina support provided by this invention further includes a step of loading a tin-containing compound after step S2. When noble metals are loaded onto the alumina support for use as catalysts, the loaded tin-containing compound can effectively suppress coking and the deterioration of catalyst stability. Specifically, it forms two effects in the alumina support: a geometric effect and an electronic effect. The geometric effect can disperse the noble metal active components on the catalyst into smaller atomic clusters, suppressing the phenomenon of reduced catalyst activity caused by noble metal agglomeration. The electronic effect can transfer electrons from the surface of noble metal species to the surface of the tin-containing compound, thereby affecting the adsorption process of reactants and reaction products on the support surface, migrating coking precursors from the noble metal surface to the support surface, and enhancing the overall coking resistance of the catalyst. Furthermore, the vacuum drying method after ultrasonic atomization allows the moisture on the inner and outer surfaces of the support to evaporate simultaneously, avoiding stress imbalance caused by uneven drying due to moisture migration, and preventing damage to the support strength.

[0038] The present invention also provides an application of the alumina prepared by the above-mentioned alumina support preparation method for preparing a dehydrogenation catalyst. The obtained dehydrogenation catalyst has high efficiency and strength that meets the requirements for use in fluidized beds. Detailed Implementation

[0039] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0040] Experimental equipment:

[0041] Physical adsorption instrument: Model ASAP2460, Micron Instruments, USA;

[0042] Intelligent particle strength testing machine: Model ZQJ-Ⅲ, Dalian Intelligent Testing Machine Factory;

[0043] Multifunctional abrasion tester: Model DGM-100B, Dalian Intelligent Testing Machine Factory.

[0044] 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.

[0045] Example 1

[0046] This embodiment provides a method for preparing an alumina support, comprising the following steps:

[0047] (1) Weigh 5 kg of SB dry adhesive powder (pseudoboehmite) and add 20 kg of 8% nitric acid sol to obtain aluminum sol;

[0048] (2) Add 10g sodium carboxymethyl cellulose and 5g tetraoctyl ammonium hydroxide to the aluminum sol in (1), adjust the pH to 4.9, and stir at 60℃ for 2h to obtain a mixed sol;

[0049] (3) The mixed sol obtained in (2) was formed by drop balling using the oil-ammonia column method, dried at 110°C for 2 hours, and calcined at 600°C for 4 hours to obtain the alumina carrier precursor;

[0050] (4) Dissolve 15.981g of stannous chloride powder (10.00g of elemental tin, 0.2% of the weight of aluminum source) in water at 50℃ to obtain a stannous chloride solution. Place the alumina support obtained in (3) into a double cone impregnation tank and use ultrasonic atomization to disperse the stannous chloride solution onto the surface of the support at a rate of 80mL / min. The ultrasonic atomization temperature is 40℃. After removal, vacuum drying is performed at a pressure of 0.04MPa, a temperature of 80℃, and a time of 2h to obtain the alumina support.

[0051] Example 2

[0052] This embodiment provides a method for preparing an alumina support, comprising the following steps:

[0053] (1) Weigh 10 kg of SB alumina powder and add 50 kg of 5% hydrochloric acid to obtain aluminum sol;

[0054] (2) Prepare a 10% solution of 200g sodium citrate, add the aluminum sol obtained in (1), add 25g ammonium hexadecyl sulfate, adjust the pH to 5.8, stir at 90℃ for 4h to obtain a mixed sol;

[0055] (3) The mixed sol obtained in (2) was formed by drop balling using the oil-ammonia column method, dried at 120°C for 4 hours, and calcined at 900°C for 6 hours to obtain the alumina carrier precursor;

[0056] (4) Dissolve 63.926g of stannous chloride (40.00g of elemental tin, 0.4% of the weight of aluminum source) in water at 40℃ to obtain a stannous chloride solution. Place the alumina support obtained in (3) into a double cone impregnation tank and use ultrasonic atomization to disperse the stannous chloride solution onto the surface of the support at a rate of 150mL / min. The ultrasonic atomization temperature is 50℃. After removal, vacuum drying is performed at a pressure of 0.02MPa, a temperature of 70℃, and a time of 1.5h to obtain the alumina support.

[0057] Example 3

[0058] This embodiment provides a method for preparing an alumina support, comprising the following steps:

[0059] (1) Weigh 8 kg of aluminum hydroxide and add 152 kg of 10% sulfuric acid to obtain aluminum sol;

[0060] (2) Add 40g of carboxymethyl cellulose and 80g of tetraoctadecyl ammonium hydroxide to the aluminum sol in (1), adjust the pH to 4.4, and stir at 40°C for 1 hour to obtain a mixed sol;

[0061] (3) The mixed sol obtained in (2) was formed by drop balling using the oil-ammonia column method, dried at 120°C for 2 hours, and calcined at 650°C for 8 hours to obtain the alumina carrier precursor;

[0062] (4) Dissolve 87.852g of tin tetrachloride (40.00g of elemental tin, 0.5% of the weight of aluminum source) in water at 40℃ to obtain tin tetrachloride solution. Place the alumina support obtained in (3) into a double cone impregnation tank and use ultrasonic atomization to disperse the tin tetrachloride solution onto the surface of the support at a rate of 100mL / min. The ultrasonic atomization temperature is 60℃. After taking it out, vacuum dry it at a pressure of 0.001MPa, a temperature of 90℃, and a time of 2h to obtain the alumina support.

[0063] Example 4

[0064] This embodiment provides a method for preparing an alumina support, comprising the following steps:

[0065] (1) Weigh 5 kg of SB dry adhesive powder and add 25 kg of 10% nitric acid sol to obtain aluminum sol;

[0066] (2) Dissolve 50g sodium carboxymethyl cellulose and 15g tetrabutylammonium bromide in 1L of water, add them to the aluminum sol obtained in (1), adjust the pH to 6.0, stir at 60℃ for 2h to obtain a mixed sol;

[0067] (3) The mixed sol obtained in (2) was formed by drop balling using the oil-ammonia column method, dried at 110°C for 2 hours, and calcined at 600°C for 4 hours to obtain the alumina carrier precursor;

[0068] (4) Dissolve 12.696g of tin oxide powder (10.00g of elemental tin, 0.2% of the weight of aluminum source) in concentrated sulfuric acid and dilute it in water at 60℃ to obtain a tin-containing solution. Place the alumina support obtained in (3) into a double cone impregnation tank and use ultrasonic atomization to disperse the tin-containing solution onto the surface of the support at a rate of 120mL / min. The ultrasonic atomization temperature is 45℃. After taking it out, vacuum dry it at a pressure of 0.005MPa, a temperature of 60℃, and a time of 4h to obtain the alumina support.

[0069] Example 5

[0070] This embodiment provides a method for preparing an alumina support, comprising the following steps:

[0071] (1) Weigh 5 kg of SB dry adhesive powder and add 25 kg of 10% nitric acid sol to obtain aluminum sol;

[0072] (2) Add 75g sodium tartrate and 250g benzyltriethylammonium hydroxide to the aluminum sol in (1), adjust the pH to 4.9, and stir at 60℃ for 2h to obtain a mixed sol;

[0073] (3) The mixed sol obtained in (2) was formed by drop balling using the oil-ammonia column method, dried at 110°C for 2 hours, and calcined at 600°C for 4 hours to obtain the alumina carrier precursor;

[0074] (4) Dissolve 31.963g of stannous chloride powder (20.00g of elemental tin, 0.4% of the weight of aluminum source) in water at 40℃ to obtain stannous chloride solution. Place the alumina support obtained in (3) into a double cone impregnation tank and use ultrasonic atomization to disperse the stannous chloride solution onto the surface of the support at a rate of 60mL / min. The ultrasonic atomization temperature is 50℃. After removal, vacuum drying is performed at a pressure of 0.01MPa, a temperature of 40℃, and a time of 1h to obtain the alumina support.

[0075] Example 6

[0076] This embodiment provides a method for preparing an alumina carrier. Compared with Example 1, the only difference is that in step (4), the drying after ultrasonic atomization is not vacuum drying.

[0077] Example 7

[0078] This comparative example provides a method for preparing an alumina support, which differs from Example 1 only in that step (4) is omitted.

[0079] Comparative Example 1

[0080] This comparative example provides a method for preparing an alumina support, comprising the following steps:

[0081] (1) Weigh 10 kg of alumina powder, 200 g of sodium citrate and 25 g of hexadecyl ammonium bisulfate, and dry mix for 40 min to obtain a mixed powder;

[0082] (2) The powder obtained in (1) is rotated and shaped by a rotary baller, dried at 110°C for 2 hours, and calcined at 600°C for 4 hours to obtain an alumina carrier precursor.

[0083] (3) Dissolve 15.981g of stannous chloride powder (10.00g of elemental tin, 0.1% of the weight of aluminum source) in water at 40℃ to obtain a stannous chloride solution. Place the alumina support obtained in (2) into a double cone impregnation tank and use ultrasonic atomization to disperse the stannous chloride solution onto the surface of the support at a rate of 150mL / min. The ultrasonic atomization temperature is 45℃. After removal, vacuum drying is performed at a pressure of 0.02MPa, a temperature of 70℃, and a time of 1.5h to obtain the alumina support.

[0084] Comparative Example 2

[0085] This comparative example provides a method for preparing an alumina carrier, which differs from Example 5 only in that no pore-expanding agent and organic amine salt template agent are added.

[0086] Comparative Example 3

[0087] This comparative example provides a method for preparing an alumina support. The only difference from Example 1 is that, in step (2), the pH is adjusted to 6.6.

[0088] Comparative Example 4

[0089] This comparative example provides a method for preparing an alumina carrier, which differs from Example 5 only in that a pore-expanding agent is not used.

[0090] Comparative Example 5

[0091] This comparative example provides a method for preparing an alumina carrier, which differs from Example 5 only in that no organic amine salt template agent is added.

[0092] Comparative Example 6

[0093] This comparative example provides a method for preparing an alumina carrier. Compared with Example 1, the difference is that step (1) is not performed, and 25 kg of ready-made aluminum sol (manufacturer: Yangzhou Zhongtianli, model: LJ-020) is used in step (2).

[0094] Test Example 1

[0095] The specific surface area and most probable pore size of the alumina supports obtained in the above examples and comparative examples were detected using a physical adsorption instrument.

[0096] The radial compressive strength of the alumina carriers obtained in the above embodiments and comparative examples was tested using an intelligent particle strength testing machine. The specific test method is as follows: 20 samples were taken according to the quartering method, and their strength was measured by the strength testing machine (denoted as P1, P2...P20). The radial crushing strength of the alumina carrier is P = (P1 + P2 + ... + P20) / 20.

[0097] The wear of the alumina carriers obtained in the above embodiments and comparative examples was detected using a multi-functional wear tester.

[0098] The bulk density is tested using the graduated cylinder compaction method. First, prepare a 100mL graduated cylinder and a rubber pad. Then, gently place the sample into the graduated cylinder and tilt it at a 45-degree angle, rotating it once. Lower the cylinder from a certain height above the rubber pad. Continue adding sample material to the graduated cylinder, repeating this process several times until the volume of the sample in the graduated cylinder no longer decreases. Finally, weigh the sample. The ratio of mass to volume is the bulk density.

[0099] The results are shown in Table 1.

[0100] Table 1

[0101]

[0102]

[0103] As shown in Table 1, the alumina carriers prepared using the method of this invention in Examples 1-7 have lower bulk density, larger specific surface area and most probable pore size, higher crushing strength, lower wear, and excellent performance and durability. In contrast, in Comparative Example 3, the pH was increased during preparation, resulting in severe tailing of the spheres and difficulty in spherical formation. Comparative Example 1, using a dry mixing method and a rotary baller, produced carriers with poor performance in all aspects. Comparative Examples 2, 4, and 5 did not add one or both of the pore-expanding agent or organic amine salt template agent during preparation, resulting in excessively small most probable pore size and excessively high bulk density. Comparative Example 6 directly used finished aluminum sol during preparation, making it difficult for the aluminum sol to be controlled by the pore-expanding agent and organic amine salt template agent during the formation of the mixed sol, ultimately resulting in a product with excessively small most probable pore size and excessively high bulk density.

[0104] Test Example 2

[0105] The dehydrogenation catalyst was prepared using the alumina support obtained in the above examples and comparative examples. The specific steps are as follows: 100g of alumina support was weighed and impregnated in palladium metal solution by equal volume impregnation method for 6 hours, dried for 2 hours, and then calcined at 400℃ for 4 hours to obtain a dehydrogenation catalyst sample with a palladium content of 0.4%.

[0106] The above-mentioned dehydrogenation catalyst was tested in a microreactor with 10 mL of the catalyst. The reaction conditions were all average industrial conditions: reaction temperature 650℃, pressure 0.08 MPa, and alkane space velocity 800 h⁻¹. -1 The hydrogen-to-hydrogen molar ratio is 0.4:1.

[0107] The alkane conversion rate and olefin selectivity were determined by gas chromatography using an Agilent 7890B from Agilent Technologies, USA, and the platinum dispersion was determined by pulsed chemisorption using an Autochem 3 from Mack. The data are shown in Table 2.

[0108] Table 2

[0109]

[0110] As shown in Table 2, the dehydrogenation catalyst prepared using the alumina support obtained by the present invention in the examples exhibits superior performance in alkane conversion, olefin selectivity, and platinum dispersion compared to the dehydrogenation catalyst prepared using the alumina support obtained in the comparative example. The excellent specific surface area and most probable pore size of the support itself contribute to the improved performance of the prepared dehydrogenation catalyst.

[0111] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing an alumina carrier, characterized in that, Includes the following steps: S1: Add the aluminum source to the acid solution for gelation to obtain aluminum sol; The mass of the aluminum source accounts for 1 / 20 to 1 / 5 of the mass of the aluminum sol; S2: Mix aluminum sol with pore-expanding agent and organic amine salt template agent, and adjust the pH to 4.0~6.0 to obtain mixed sol; The pore-expanding agent is added at a mass of 0.1% to 2% of the aluminum source mass; the pore-expanding agent includes one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium citrate, and sodium tartrate. The organic amine salt template agent is added at a mass of 0.01% to 5% of the aluminum source mass; the organic amine salt template agent includes any one of benzyltriethylammonium hydroxide, tetraalkylammonium hydroxide, alkylammonium hydrogen sulfate, and tetraalkylammonium bromide. S3: The mixed sol obtained in S2 is formed by drop ball molding to obtain wet sol balls, which are then calcined to obtain an alumina carrier; In step S3, the calcination temperature is 450~1000℃ and the calcination time is 2~8h; Following step S3, the process further includes a step of loading a tin-containing compound; Methods for loading tin-containing compounds onto alumina supports include ultrasonic atomization. After loading the tin-containing compound onto the alumina support using ultrasonic atomization, a vacuum drying step is also included.

2. The method for preparing the alumina carrier according to claim 1, characterized in that, The mass concentration of the acid solution is 5%~20%; And / or, in step S2, adjust the pH to 4.5~5.

0.

3. The method for preparing the alumina carrier according to claim 1, characterized in that, Step S2, after adjusting the pH, also includes a stirring step; And / or, in step S3, before calcination, the wet sol balls are further washed and dried.

4. The method for preparing the alumina carrier according to claim 3, characterized in that, In step S2, the stirring temperature is 40~90℃, and the stirring time is 0.5~4h; And / or, in step S3, the drying temperature is 100~130℃ and the drying time is 2~6h.

5. The method for preparing the alumina support according to any one of claims 1 to 4, characterized in that, The mass of the tin-containing compound loaded, in terms of elemental tin, is 0.1% to 0.5% of the mass of the aluminum source.

6. The method for preparing the alumina carrier according to claim 5, characterized in that, The mass of the tin-containing compound loaded, in terms of elemental tin, is 0.15% to 0.35% of the mass of the aluminum source.

7. The method for preparing the alumina carrier according to claim 1, characterized in that, The temperature for ultrasonic atomization is 40~60℃, and the rate of ultrasonic atomization is 60~150mL / min; And / or, the vacuum drying temperature is 40~90℃, the vacuum drying time is 1~4h, and the vacuum drying pressure is 0.001~0.06MPa.

8. An alumina support prepared by the preparation method according to any one of claims 1 to 7.

9. The use of the alumina support according to claim 8 in the preparation of dehydrogenation catalysts.

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