Macroporous pseudo-boehmite as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of pseudo-boehmite production, and particularly relates to macroporous pseudo-boehmite as well as a preparation method and application thereof. The preparation method of the macroporous pseudo-boehmite comprises the following steps: mixing crushed bauxite with alkali liquor, and carrying out dissolution reaction and silicon removal treatment to prepare a sodium aluminate solution; and introducing the CO2 micro-nano bubble suspension into a sodium aluminate solution to carry out gas-liquid reaction, filtering, washing and drying to obtain the macroporous pseudo-boehmite. According to the method, the unique physicochemical characteristics of micro-nano bubbles are exerted, the gas-liquid reaction process is enhanced, the reaction rate and the mass transfer efficiency are improved, the pore structure of the product is accurately controlled, and the high-quality macroporous pseudo-boehmite with the specific surface area larger than or equal to 300 m < 2 > / g, the average pore diameter larger than or equal to 10 nm, the pore volume larger than or equal to 1.0 cm < 3 > / g and uniform pore diameter distribution is prepared. The strict requirements of different industries such as catalysts, adsorption materials and ceramic materials on the high-performance macroporous pseudo-boehmite are met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pseudo-boehmite production, and particularly relates to a macroporous pseudo-boehmite, a preparation method thereof and an application thereof. BACKGROUND

[0002] Pseudo-boehmite (also known as monohydrated aluminum oxide or pseudo-one water soft aluminum, molecular formula Al2O3·nH2O (n=0.08-0.62)) has the characteristics of non-toxic, odorless, non-odor, high crystal phase purity, good peptization performance, strong adhesion, high specific surface area and large pore volume, and is an important inorganic chemical basic material. In particular, macroporous pseudo-boehmite has high specific surface area, large pore size and excellent pore structure characteristics, and plays an indispensable role in modern industrial catalysis, adsorption separation and other key fields.

[0003] At present, the methods for industrial production of pseudo-boehmite include alcohol aluminum hydrolysis method, hydrothermal synthesis method and carbon dioxide precipitation method. Among them, the alcohol aluminum hydrolysis method can prepare high-purity pseudo-boehmite products with excellent performance, but this method has the problems of high raw material cost and extremely harsh reaction conditions, and the recovery and treatment process of by-products is complex, which seriously restricts its large-scale industrialization and application. The pseudo-boehmite prepared by the hydrothermal synthesis method has the advantages of regular crystal form and uniform particle size distribution, but the equipment investment is huge, the energy consumption is high, and the production cycle is long, which is difficult to meet the urgent needs of the market for rapid production. The carbon dioxide precipitation method has the advantages of wide raw material sources and relatively simple process, and has become a widely used production method. This method uses sodium aluminate solution and carbon dioxide as raw materials to realize the preparation of pseudo-boehmite through gas-liquid reaction. However, the traditional carbon dioxide precipitation method has inherent defects of low gas-liquid mass transfer efficiency and slow reaction rate, resulting in uneven pore size distribution and low macropore ratio of the product, which cannot meet the strict requirements of high-end markets on the quality and performance of macroporous pseudo-boehmite.

[0004] With the rapid development of strategic emerging industries such as catalysts and adsorption materials, the demand for macroporous pseudo-boehmite has shown an explosive growth trend, and higher standards have been put forward for key performance indicators such as pore size, specific surface area and pore volume. However, in the existing technology, although the method for preparing macroporous pseudo-boehmite by carbon dioxide precipitation has been disclosed, the addition of pore expanding agent in the sodium aluminate solution and the carbonization reaction by CO2 in the preparation process not only increases the production cost, but also cannot avoid the inherent defects of low gas-liquid mass transfer efficiency and slow reaction rate. Therefore, the development of a new process that can significantly improve the gas-liquid mass transfer efficiency and rapidly produce high-quality macroporous pseudo-boehmite has become the key to promoting the technological innovation and sustainable development of related industries. SUMMARY

[0005] The application aims to provide a macroporous pseudo-boehmite and a preparation method and application thereof, so as to overcome the shortcomings of the prior art, and to realize efficient and high-quality preparation of the macroporous pseudo-boehmite by preparing micro-nano CO2 bubbles based on micro-nano bubble strengthening technology and then performing gas-liquid reaction with a sodium aluminate solution, so that the macroporous pseudo-boehmite has a wide application prospect in high-tech fields such as catalyst carriers, adsorption materials and ceramic materials.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0007] In the first aspect, the application provides a preparation method of macroporous pseudo-boehmite, comprising the following steps:

[0008] (1) mixing crushed bauxite with an alkali solution, performing dissolution reaction and silicon removal treatment to prepare a sodium aluminate solution;

[0009] (2) passing CO2 micro-nano bubble suspension into the sodium aluminate solution to perform gas-liquid reaction, and then performing filtration, washing and drying to prepare the macroporous pseudo-boehmite.

[0010] The application innovatively adopts a process method of strengthening CO2 gas-liquid reaction with a sodium aluminate solution to produce macroporous pseudo-boehmite by using micro-nano bubbles. By fully exerting the unique physical and chemical properties of the micro-nano bubbles, the gas-liquid reaction process is strengthened, the reaction rate and mass transfer efficiency are improved, and the pore structure of the product is accurately controlled, so that the high-quality macroporous pseudo-boehmite product is prepared.

[0011] In some other embodiments, in step (1), the mixing mass ratio of the bauxite to the alkaline solution is 1:(2-3);

[0012] The concentration of the alkali solution is 30-50wt%;

[0013] The temperature of the dissolution reaction is 150-260℃, the pressure is 3-5MPa, and the dissolution time is 2-4h;

[0014] The alkali solution is one of a sodium hydroxide solution, ammonia water and a potassium hydroxide solution;

[0015] Preferably, the alkaline liquid is a sodium hydroxide solution.

[0016] In some other embodiments, in step (1), the silicon removal treatment is to add a silicon removal agent to the filtrate after the dissolution reaction to remove silicon ions;

[0017] The silicon removal treatment is to stand for 1-2h at room temperature or to heat to 180-200℃ and keep for 1-2h;

[0018] The silicon removal agent is calcium hydroxide;

[0019] The concentration of the calcium hydroxide solution is 5-10wt%.

[0020] The main component in bauxite is alumina (Al2O3), and impurities such as iron oxide (Fe2O3) and silicon dioxide (SiO2). Sodium hydroxide reacts with Al2O3 to form soluble sodium aluminate (NaAlO2), while Fe2O3 is insoluble in strong alkali, and SiO2 will partially react, so that the prepared sodium aluminate solution contains silicon ions; the addition of calcium hydroxide is beneficial to remove the silicon ions in the sodium aluminate solution, thereby realizing the refinement of the sodium aluminate solution, and further facilitating the obtaining of large-pore pseudo-boehmite with high purity.

[0021] In some other embodiments, in step (2), the average particle size of the CO2 micro-nano bubble in the CO2 micro-nano bubble suspension is 50-200 nm; the residence time of CO2 micro-nano bubbles with this size in the reaction system will be longer, which is beneficial to the sufficient contact of the CO2 micro-nano bubbles with the sodium aluminate solution, higher gas-liquid mass transfer efficiency, and accelerated reaction rate.

[0022] The concentration of alumina in the sodium aluminate solution is 90-150 g / L. The reaction efficiency is higher in this concentration range.

[0023] In some other embodiments, in step (2), the preparation method of the CO2 micro-nano bubble suspension is as follows:

[0024] The CO2 gas is introduced into deionized water to prepare a CO2 micro-nano bubble suspension in a micro-nano bubble generator;

[0025] The flow rate of the CO2 gas is 0.5-1.5 L / min;

[0026] The preparation pressure of the CO2 micro-nano bubble suspension is 0.3-0.8 MPa, and the temperature is 20-30℃. This preparation process is beneficial to the preparation of a CO2 micro-nano bubble suspension with an average particle size of 50-200 nm, which improves the sufficient contact of the CO2 micro-nano bubble suspension with the sodium aluminate solution and the gas-liquid mass transfer efficiency.

[0027] In some other embodiments, in step (2), the flow rate of the CO2 micro-nano bubble suspension in the gas-liquid reaction is 1-3 L / min, the reaction temperature is 20-50℃, the reaction time is 5-15 min, and the aeration is stopped when the pH value reaches 9-11; preferably, the aeration is stopped when the pH value reaches 10-10.5. The reaction in this range is more thorough, the gas-liquid mass transfer efficiency is higher, and the specific surface area and pore size of the large-pore pseudo-boehmite can be more accurately controlled and improved.

[0028] In some other embodiments, in step (2), the washing liquid used for washing is ionized water and an ammonium nitrate solution;

[0029] The concentration of the ammonium nitrate solution is 5-10wt%;

[0030] The drying temperature is 100-120℃, and the drying time is 4-6h.

[0031] After the reaction is completed, the reaction product is sequentially subjected to filtration and washing operations. First, the product is washed 3-5 times with deionized water, and then washed 1-2 times with a 5-10wt% ammonium nitrate solution. The macroporous pseudoboehmite is washed with the ammonium nitrate solution because ammonium nitrate is a strong acid salt that, when dissolved in water, decomposes to produce nitrate and ammonium ions; ammonium nitrate can help remove impurity ions in the pores and on the surface of the macroporous pseudoboehmite, and can also change the surface charge through ion exchange to maintain the stability of the pore structure. In addition, ammonium nitrate decomposes at high temperatures, and even if it remains in the macroporous pseudoboehmite, it can decompose to generate gas during drying or subsequent use, which helps to form or maintain the macroporous structure.

[0032] In a second aspect, the present application provides the macroporous pseudoboehmite prepared by the method of the first aspect.

[0033] In some other embodiments, the specific surface area of the macroporous pseudoboehmite is ≥300m 2 / g, the average pore size is ≥10nm, and the pore volume is ≥1.0cm 3 / g. These properties can meet the requirements for pore structure and thermal stability in fields such as catalysis and adsorption.

[0034] In a third aspect, the present application provides the use of the macroporous pseudoboehmite of the first aspect as a catalyst carrier, an adsorption material, and a ceramic material.

[0035] The present application has the following advantages:

[0036] (1) The present application uses micro-nano bubbles to intensify the gas-liquid reaction of CO2 and sodium aluminate solution to produce macroporous pseudoboehmite. The micro-nano bubbles can quickly and efficiently transfer CO2 to the sodium aluminate solution due to their large specific surface area and high surface activity. The unique physical and chemical properties of the micro-nano bubbles can intensify the gas-liquid reaction process, increase the reaction rate of the entire reaction system by 30%-50%, and improve the mass transfer efficiency (the carbonation reaction time in the ordinary process is generally 15-30 minutes, while the carbonation reaction time in the present application is generally about 10 minutes). This enables precise control of the pore structure of the product, and thus high-quality macroporous pseudoboehmite products with high surface area, large pore volume, and uniform pore size distribution can be prepared to meet the strict requirements of different industries such as catalysts, adsorption materials, and ceramic materials for high-performance macroporous pseudoboehmite.

[0037] (2) The present application realizes fine regulation and control of the product pore structure by precise control of the micro-nano bubble generation conditions, gas-liquid reaction parameters and post-processing technology, etc. The prepared macroporous pseudo-boehmite product has high specific surface area, large pore size, high pore volume and uniform pore size distribution, and its comprehensive performance is significantly better than that of the product prepared by the traditional process (the traditional process such as specific surface area of 200-250 m 2 / g, average pore size of 3-6 nm, pore volume of 0.3-0.5 cm 3 / g), which can fully meet the strict requirements of high-end markets for high-quality macroporous pseudo-boehmite.

[0038] (3) The raw materials used in the present application are widely available and low in price, and less waste is generated during production, which is friendly to the environment. At the same time, the whole process operation is simple and easy to understand, and the precise control in the industrial production process can be easily realized, which is suitable for large-scale industrialization and application, can create significant economic and social benefits for enterprises, and help enterprises to occupy an advantageous position in market competition. DETAILED DESCRIPTION

[0039] Those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. The specific conditions are not specified in the examples, and the conventional conditions or the conditions recommended by the manufacturer are used. The components used are not specified by the manufacturer, and are all conventional products available on the market.

[0040] The bauxite is a monohydrate diaspore mineral source in the northern region of Shanxi, and the particle size of the crushed bauxite is ≤325 μm, and the purity is 99%.

[0041] The micro-nano bubble generator used can be any one of a gas-liquid mixing pump, a microwave bubble generator, and a high-speed centrifugal disperser.

[0042] The present application is aimed at the process of producing macroporous pseudo-boehmite by the traditional carbon dioxide precipitation method. Because the mass transfer between the gas-liquid two phases is not sufficient, it directly leads to slow reaction progress, the pore structure of the product is difficult to control accurately, the formation of macroporous structure exists great difficulty, which hinders the improvement of the quality of pseudo-boehmite product and the increase of production efficiency, so that the product cannot meet the urgent needs of modern industry for high-performance macroporous pseudo-boehmite.

[0043] The process for producing large-pore pseudo-boehmite by strengthening the gas-liquid reaction of CO2 and sodium aluminate solution with micro-nano bubbles aims to completely solve the above problems existing in the prior art. By introducing advanced micro-nano bubble technology, the gas-liquid mass transfer efficiency can be greatly improved, the reaction rate can be significantly accelerated, and the pore structure of the product can be accurately controlled, thereby preparing large-pore pseudo-boehmite products with high specific surface area, large pore size and uniform pore size distribution. The process not only can effectively improve the production efficiency and reduce the production cost, but also can significantly improve the product quality, fully meet the diversified needs of high-end markets for large-pore pseudo-boehmite, and has important strategic significance and practical value for promoting the technological progress and industrial upgrading of related industries such as catalysts and adsorbent materials.

[0044] Example 1

[0045] A method for preparing large-pore pseudo-boehmite, specifically comprising the following steps:

[0046] (1) Sodium aluminate solution preparation: 100 g of crushed bauxite is mixed with 200 g of 40% mass fraction sodium hydroxide solution and placed in a reaction kettle for leaching reaction under the conditions of temperature 160℃ and pressure 3.5 MPa. The reaction lasts for 3 hours to obtain a crude sodium aluminate solution.

[0047] After filtering the crude sodium aluminate solution to remove insoluble substances, 10 g of 8% mass fraction calcium hydroxide solution is added to the filtrate, stirred uniformly, and then left to stand for 1.5 hours for desilication treatment. The refined sodium aluminate solution is obtained after re-filtering. The concentration of aluminum oxide in the refined sodium aluminate solution is 100 g / L.

[0048] (2) Micro-nano bubble generation: CO2 gas is introduced into deionized water in a micro-nano bubble generator at a flow rate of 1 L / min to generate CO2 micro-nano bubble suspension under the conditions of pressure 0.5 MPa and temperature 25℃. The average particle size of the micro-nano bubbles is 100 nm.

[0049] (3) Gas-liquid reaction: The refined sodium aluminate solution prepared in step (1) is transferred to a reaction kettle, and the temperature is controlled at 40±5℃. The CO2 micro-nano bubble suspension prepared in step (2) is introduced into the reaction kettle at a flow rate of 2 L / min under the condition of stirring speed 400 r / min for gas-liquid reaction. The pH value of the solution is monitored in real time during the reaction. When the pH value drops to 10, the aeration is stopped, and the total reaction time is 10 minutes.

[0050] (4) Post-treatment: After the reaction is completed, the reaction product is filtered, washed with deionized water for 4 times, washed with 8% mass fraction ammonium nitrate solution for 1 time, and then dried at 100℃ for 8 hours to obtain the large-pore pseudo-boehmite finished product.

[0051] The specific surface area of the prepared large-pore pseudo-boehmite product is 350 m 2 / g, the average pore size is 12 nm, and the pore volume is 1.23 cm 3 / g, and the pore size distribution is uniform.

[0052] Example 2

[0053] A method for preparing large-pore pseudo-boehmite, specifically comprising the following steps:

[0054] (1) Preparation of sodium aluminate solution: 120 g of crushed bauxite is mixed with 240 g of a 45% by mass sodium hydroxide solution, and a leaching reaction is carried out in a reaction kettle at a temperature of 170°C and a pressure of 4 MPa for 2 hours to obtain a crude sodium aluminate solution. After filtering the crude solution to remove insoluble substances, 12 g of a 9% by mass calcium hydroxide solution is added to the filtrate, which is stirred uniformly and left to stand for 2 hours for desilication treatment. The refined sodium aluminate solution is obtained by filtering again, and the concentration of aluminum oxide in the solution is detected to be 110 g / L.

[0055] (2) Micro-nano bubble generation: CO2 gas is introduced into deionized water in a micro-nano bubble generator at a flow rate of 0.8 L / min to generate a CO2 micro-nano bubble suspension under a pressure of 0.6 MPa and a temperature of 22°C. The average particle size of the micro-nano bubbles is detected to be 80 nm.

[0056] (3) Gas-liquid reaction: The refined sodium aluminate solution prepared in step (1) is controlled at a temperature of 35±5°C, and the CO2 micro-nano bubble suspension prepared in step (2) is introduced at a flow rate of 1.5 L / min under stirring at a speed of 350 r / min for gas-liquid reaction. The gas introduction is stopped when the pH value of the solution decreases to 10, and the total reaction time is 10 minutes.

[0057] (4) Post-treatment: After the reaction is completed, the product is filtered, washed with deionized water for 3 times, washed with a 7% by mass ammonium nitrate solution for 1 time, and then dried at 100°C for 6 hours to obtain the large-pore pseudo-boehmite product.

[0058] The specific surface area of the prepared large-pore pseudo-boehmite product is 330 m 2 / g, the average pore size is 11 nm, and the pore volume is 1.12 cm 3 / g, and the pore size distribution is uniform.

[0059] Example 3

[0060] A method for preparing large-pore pseudo-boehmite, specifically comprising the following steps:

[0061] (1) Sodium aluminate solution preparation: 80 g of crushed bauxite was mixed with 160 g of 35% mass fraction sodium hydroxide solution, and a dissolution reaction was carried out in a reaction kettle at a temperature of 200°C and a pressure of 4.5 MPa, and the reaction time was 2 hours to obtain a crude sodium aluminate solution. After the crude solution was filtered, 8 g of 7% mass fraction calcium hydroxide solution was added to the filtrate, and desilication treatment was carried out after being kept at 200°C for 2 hours, and refined sodium aluminate solution was obtained by filtering again. The concentration of aluminum oxide in the solution was 90 g / L after detection.

[0062] (2) Micro-nano bubble generation: CO2 gas was introduced into the deionized water in the micro-nano bubble generator at a flow rate of 1.2 L / min, and CO2 micro-nano bubble suspension was generated under the conditions of a pressure of 0.7 MPa and a temperature of 28°C. The average particle size of the micro-nano bubbles was 120 nm after detection.

[0063] (3) Gas-liquid reaction: The refined sodium aluminate solution prepared in step (1) was controlled at a temperature of 25±5°C, and the CO2 micro-nano bubble suspension prepared in step (2) was introduced at a flow rate of 2.5 L / min under the condition of a stirring speed of 500 r / min to carry out a gas-liquid reaction. When the pH value of the solution decreased to 10.5, the aeration was stopped, and the total reaction time was 10 minutes.

[0064] (4) Post-treatment: After the reaction was completed, the product was filtered, washed with deionized water for 5 times, washed with 9% mass fraction ammonium nitrate solution for 1 time, and then dried at 120°C for 4 hours to obtain the large-pore pseudo-boehmite product.

[0065] The specific surface area of the large-pore pseudo-boehmite product was 360 m 2 / g, the average pore size was 13 nm, and the pore volume was 1.34 cm 3 / g, and the pore size distribution was uniform.

[0066] Comparative Example 1

[0067] Different from Example 1, step (2) was omitted, and CO2 was directly introduced into the refined sodium aluminate solution in step (3) to carry out a gas-liquid reaction, and the other preparation steps were the same as those in Example 1. The reaction time was 30 minutes. The specific surface area of the pseudo-boehmite product was 218 m 2 / g, the average pore size was 6 nm, and the pore volume was 0.37 cm 3 / g, which was a non-large-pore ordinary pseudo-boehmite.

[0068] Comparative Example 2

[0069] The difference between Example 1 is that the average particle size of the micro-nano bubbles prepared in step (2) is 1.2 mm (CO2 gas is passed into the steel wire mesh bubble generator at a flow rate of 1.6 L / min, and a CO2 micro-nano bubble suspension is generated under the conditions of a pressure of 0.5 MPa and a temperature of 30°C, and the micro-nano bubble average particle size is 1.2 mm after detection), and the other preparation steps are the same as those of Example 1. The reaction time is 17 minutes, and the pseudo-boehmite product has a specific surface area of 232 m 2 / g, an average pore size of 7 nm, and a pore volume of 0.41 cm 3 / g, which is a non-macroporous ordinary pseudo-boehmite.

[0070] Comparative Example 3

[0071] The difference between Example 1 is that the average particle size of the micro-nano bubbles prepared in step (2) is 1 mm (CO2 gas is passed into the steel wire mesh bubble generator at a flow rate of 1.6 L / min, and a CO2 micro-nano bubble suspension is generated under the conditions of a pressure of 0.5 MPa and a temperature of 30°C, and the micro-nano bubble average particle size is 1.2 mm after detection), and the other preparation steps are the same as those of Example 1. The reaction time is 17 minutes, and the pseudo-boehmite product has a specific surface area of 232 m 2 / g, an average pore size of 7 nm, and a pore volume of 0.41 cm 3 / g, which is a non-macroporous ordinary pseudo-boehmite.

[0072] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing macroporous pseudo-boehmite, characterized in that: The following steps are involved: (1) Mixing the crushed bauxite with alkali solution, performing a dissolution reaction and desiliconization treatment, and preparing a sodium aluminate solution; (2) A CO2 micro-nano bubble suspension is introduced into a sodium aluminate solution to carry out a gas-liquid reaction, and macroporous pseudo-boehmite is obtained after filtration, washing and drying.

2. The method for preparing macroporous pseudo-boehmite according to claim 1, wherein: In step (1), the mixing mass ratio of the bauxite to the alkali solution is 1:(2-3); The concentration of the alkali solution is 30-50wt%; The dissolution reaction temperature is 150-260°C, the pressure is 3-5MPa, and the dissolution time is 2-4h; The alkali solution is one of sodium hydroxide solution, ammonia water and potassium hydroxide solution; Preferably, the alkali solution is sodium hydroxide solution.

3. The method for preparing macroporous pseudo-boehmite according to claim 1, characterized in that: In step (1), the desiliconization treatment is to add a desiliconizing agent to the filtrate after the dissolution reaction is filtered to remove silicon ions; The desiliconization treatment is to stand at room temperature for 1-2 hours or heat to 180-200°C and keep warm for 1-2 hours; The silicon remover is calcium hydroxide; The concentration of the calcium hydroxide solution is 5-10 wt%.

4. The method for preparing macroporous pseudo-boehmite according to claim 1, wherein: In step (2), the average particle size of the CO2 micro-nano bubbles in the CO2 micro-nano bubble suspension is 50-200 nm; The concentration of aluminum oxide in the sodium aluminate solution is 90-150 g / L.

5. The method for preparing macroporous pseudo-boehmite according to claim 1, characterized in that: In step (2), the preparation method of the CO2 micro-nano bubble suspension is as follows: The CO2 gas is introduced into deionized water to produce a CO2 micro-nano bubble suspension in a micro-nano bubble generator; The flow rate of the CO2 gas is 0.5-1.5 L / min; The preparation pressure of the CO2 micro-nano bubble suspension is 0.3-0.8 MPa and the temperature is 20-30°C.

6. The method for preparing macroporous pseudo-boehmite according to claim 1, characterized in that: In step (2), the flow rate of the CO2 micro-nano bubble suspension in the gas-liquid reaction is 1-3 L / min, the reaction temperature is 20-50°C, the reaction time is 5-15 min, and ventilation is stopped when the reaction reaches a pH value of 9-11.

7. The method for preparing macroporous pseudo-boehmite according to claim 1, characterized in that: In step (2), the washing liquid used for washing is ionized water and ammonium nitrate solution; The concentration of the ammonium nitrate solution is 5-10wt%; The drying temperature is 100-120° C. and the drying time is 4-6 hours.

8. Macroporous pseudo-boehmite obtained by the method for preparing macroporous pseudo-boehmite according to any one of claims 1 to 7.

9. The macroporous pseudo-boehmite according to claim 8, characterized in that The specific surface area of ​​the macroporous pseudo-boehmite is ≥300m 2 / g, average pore diameter ≥10nm, pore volume ≥1.0cm 3 / g.

10. Use of the macroporous pseudo-boehmite according to claim 8 or 9 in catalyst carriers, adsorption materials and ceramic materials.