40 results about "Pseudoboehmite" patented technology

The invention discloses a method for producing macroporous pseudo-boehmite by a double-aluminum method, and belongs to the field of preparation of inorganic porous materials. Aiming at the problems of difficulty in giving consideration to uniformity of crystal nucleus and aperture, serious chambering pollution, high washing water amount and batch instability in single pH gelling of a traditional double-aluminum method, the method comprises the following steps: after pretreatment of raw materials, carrying out segmented pH parallel flow gelling, synchronously dropwise adding a silicon-fluorine composite modifier in a chambering stage, and then carrying out gradient temperature control washing, composite modification aging and drying. The prepared macroporous pseudo-boehmite is suitable for a high-end catalyst carrier and has remarkable industrial advantages.

The invention belongs to the field of propane dehydrogenation catalysts, and particularly provides a spherical alumina carrier for propane dehydrogenation, a preparation method of the spherical alumina carrier and a catalyst.The preparation method of the spherical alumina carrier for propane dehydrogenation comprises the following steps that 1, pseudo-boehmite sol and polysaccharide are evenly mixed, and a precursor solution is obtained after curing; (2) dropwise adding the precursor solution into an oil ammonia forming column, and gelatinizing and curing to obtain gel balls; the upper layer of the oil ammonia forming column is a paraffin oil layer, and the lower layer is a composite ammonia water solution; the composite ammonia water solution comprises ammonia water, 2-formylphenylboronic acid and zinc nitrate; and 3) washing the obtained gel balls with deionized water and absolute ethyl alcohol, then transferring the gel balls into an aging solution for aging, filtering, washing, drying, and then roasting to obtain the catalyst. The catalyst prepared by the invention has the advantages of high catalytic activity and coking resistance.

The present invention provides a silicon scavenger, comprising alumina, pseudo-boehmite and an active component, wherein the active component is a Group VIB metal sulfide and a Group VIII metal sulfide, wherein the Group VIB metal sulfide accounts for 2-20%, the Group VIII metal sulfide accounts for 1-10%, the pseudo-boehmite content is 3-20%, and the specific surface area of ​​the silicon scavenger is 300-400m 2 / g, with a surface hydroxyl content of 1000-2000µmol / g. The silicon scavenger is prepared by impregnating and loading the active component, followed by sulfidation. Pseudoboehmite is then synthesized on the surface of the silicon scavenger using an aluminum source and a precipitant. This provides the silicon scavenger with abundant surface hydroxyl groups, thereby improving its silicon-holding capacity. Sulfidation followed by pseudoboehmite loading avoids subsequent high-temperature treatment, preventing aggregation of pseudoboehmite particles that would reduce the surface hydroxyl content. This also improves the silicon-holding capacity of the silicon-capturing catalyst. The contact surface between the metal sulfide wafer and the pseudoboehmite is increased, enhancing the synergistic effect between the catalyst's hydrogenation performance and silicon-capturing properties.

This invention discloses a method for preparing pseudoboehmite with high specific surface area and high conversion rate by sand milling and hydrolysis, belonging to the field of materials chemistry. The method involves using high-purity aluminum isopropoxide purified by vacuum distillation as a dispersant, and sand milling and stirring under specific pH, temperature, and vacuum conditions to complete the hydrolysis and aging process. Microwave drying is then employed to obtain a sample with a specific surface area >350 cm². 2 Boehmite powder with an alumina conversion rate of ≥76% per g can be used for the production of laser crystal-grade alumina and gem-grade alumina, and is also suitable for use as a catalyst support; moreover, the preparation method is simple to operate, easy to control, and easy to industrialize.

A process for preparing a silica-alumina gel-based catalyst produced in extruded form and usable in the field of hydrocarbon catalytic conversion processes, e.g., alkylation, isomerization and oligomerization, wherein the flammable alcohols resulting from the hydrolysis of metal precursors and gelling are removed by evaporation and replaced, in whole or in part in terms of weight, with demineralized water added to the mixture in an amount of 30 to 100 weight-% of the amount of formed alcohols, so as to maintain the gel with a rheology comparable to that of the original gel containing the alcohols, thus allowing the step of mixing the mixture obtained by gelling with a binder precursor (boehmite or pseudo-boehmite) and a subsequent extrusion of the paste to also be carried out in non-explosion-proof electrical equipment and systems.

A coating formulation includes fumed silica, boric acid, a binder, water, and, optionally, ethanol and / or pseudo-boehmite. A pH of the formulation is from 2.0 to 3.0, a ratio of fumed silica to binder by weight is from 3.0:1 to 4.5:1, a ratio of boric acid to binder by weight is from 9.5% to 28%, and a ratio of boric acid to the total amount of both fumed silica and pseudo-boehmite is at least 3.0%.

This invention belongs to the field of petrochemical technology, specifically relating to a high-purity pseudoboehmite with concentrated pore size and its preparation method. The preparation method includes: mixing aluminum sulfate solution with ammonia water for a primary neutralization reaction; adding ammonia water and a pore-expanding agent to the resulting slurry for a secondary neutralization reaction; subsequently heating and allowing it to age; filtering, washing, drying, and pulverizing the aged product to obtain high-purity pseudoboehmite. The preparation method of this invention employs co-current and overflow neutralization, reducing the process flow and simplifying operation. It solves the problems of high synthesis cost, complex operation, and environmental pollution in existing pseudoboehmite synthesis methods. The generated byproduct, ammonium sulfate, has certain industrial application value. The pseudoboehmite obtained by this invention has the advantages of large specific surface area, large pore volume, and uniform and concentrated pore size distribution.

The invention relates to the technical field of aluminum oxide material preparation, in particular to a method for preparing filamentous pseudo-boehmite through standing sedimentation and aging and filamentous pseudo-boehmite. The method comprises the following steps: carrying out carbonization reaction on carbon dioxide and a sodium aluminate solution to obtain a carbonized solution; according to a preset volume ratio, mixing water with a preset temperature with the carbonized liquid to obtain mixed slurry; wherein the temperature of the water is higher than that of the carbonization liquid; the mixed slurry is subjected to standing sedimentation and solid-liquid separation in sequence, micron particles are separated, and supernatant liquid is obtained; performing aging treatment on the supernatant liquid to obtain aged slurry; and carrying out post-treatment on the aged slurry to obtain the filamentous pseudo-boehmite. According to the method, the physical and chemical property difference of carbonization liquid components is utilized, enrichment and oriented growth of target nano colloidal particles are achieved through hot water temperature control treatment, standing settling separation and aging treatment, and finally the filamentous pseudo-boehmite product with good morphology and low impurity content is obtained.

The invention relates to a decomposition catalyst of perfluorinated compounds PFCs (Perfluorocompounds) and a preparation method of the decomposition catalyst, and provides a PFC decomposition catalyst, a honeycomb type catalyst forming body and a preparation method of the honeycomb type catalyst forming body. Zinc as an activity improving component and tungsten (W) as an auxiliary component are added to one or more aluminum oxides selected from gamma aluminum oxide, aluminum hydroxide, boehmite and pseudo-boehmite at a weight ratio of Al: Zn: W = 100: (30-100): (1-11). The PFC decomposition catalyst according to the present invention has durability with respect to fluorine generated by PFC decomposition, also has a synergistic effect capable of improving reaction activity, and is capable of decomposing a perfluorinated compound at a low temperature compared to conventional PFC decomposition catalysts. Thus, it is possible to reduce the operating cost associated with continuous operation, while ensuring the durability of the system.

This invention discloses a method for rapidly detecting the gel solubility index of pseudoboehmite, comprising: weighing a weight of m 1 The pseudoboehmite was calcined in a high-temperature furnace, then transferred to a desiccator to cool to room temperature, and weighed. m 2 The mass fraction of Al2O3 is calculated according to... W The value of Al2O3 content was determined by weighing it on a balance. m 3 The pseudoboehmite was placed in a beaker, deionized water was added, and the mixture was mechanically stirred. Nitric acid solution was added dropwise, and stirring continued until a gel was formed. The gel was then transferred to a centrifuge tube and centrifuged. After centrifugation, the supernatant was discarded, the inner wall of the centrifuge tube was rinsed with water, and the washing liquid was discarded. The insoluble matter at the bottom of the centrifuge tube was removed and rinsed with water. The insoluble matter and washing water were poured into a weighing bottle, dried, and then transferred to a desiccator to cool to room temperature before weighing and recording the weight. m 4 The gel solubility index of boehmite is calculated. This invention has the advantages of short testing cycle, simple operation, high accuracy, economic practicality, and strong adaptability.

This invention relates to the field of hydrogenation technology, and discloses a hydrogenation catalyst, its preparation method, and its application. The method includes: reacting an acidic solution containing aluminum and titanium with an alkaline solution containing aluminum to form a gel, obtaining a solid gel product; aging the solid gel product in the presence of a precipitant to obtain an aging product; subjecting the aging product to hydrothermal treatment, followed by a first drying, to obtain titanium-containing pseudoboehmite, wherein the hydrothermal treatment temperature is higher than the aging reaction temperature; optionally shaping the titanium-containing pseudoboehmite, followed by a second drying and a first calcination, to obtain a titanium oxide-alumina composite oxide support; introducing an active component and an additive onto the titanium oxide-alumina composite oxide support, followed by a third drying and a second calcination. This method avoids using organic titanium-containing reagents to prepare a catalyst with a low titanium oxide content and a specific crystal structure in an alumina-titanium oxide composite oxide support, thereby improving the catalyst's reactivity.

This invention discloses a residue hydrotreating catalyst, its preparation method, and its application. The catalyst preparation method includes the following steps: impregnating a first active metal solution onto a porous carbon-nitrogen / SiO2 composite support, drying, and calcining to obtain a metal / composite support material; preparing a pseudoboehmite wet filter cake, drying it, and obtaining pseudoboehmite; mixing the metal / composite support with the pseudoboehmite, molding, and drying to obtain a catalyst precursor; and then impregnating it with a second active metal solution, drying, and calcining to obtain the catalyst. The catalyst provided by this invention is suitable for residue hydrotreating, especially exhibiting excellent catalytic performance in desulfurization and denitrification.

This application relates to a silicon-modified macroporous pseudoboehmite and its preparation method, belonging to the technical field of pseudoboehmite preparation. The method includes: mixing an aluminum salt solution and a sodium aluminate solution in parallel flow and performing a low-temperature neutralization reaction; adding a low-concentration water glass 5-8 minutes after the start of the reaction, ensuring the water glass addition ends before the neutralization reaction ends, to obtain an amorphous precursor; separating the amorphous precursor into a liquid and solid state to obtain a filter cake; mixing the filter cake with deionized hydrated slurry to obtain a slurry; adding sodium carbonate to the slurry to adjust the pH to 8-9 to obtain an alkaline slurry; subjecting the alkaline slurry to an aging and crystallization reaction at high temperature to obtain a pseudoboehmite slurry; filtering and washing the pseudoboehmite slurry to obtain a silicon-modified macroporous pseudoboehmite filter cake, and then drying it to obtain silicon-modified macroporous pseudoboehmite.

A method of producing a capacitor electrode includes forming an oxide layer on a foil. The method also includes heating the foil to a target temperature so as to induce defects in the oxide layer. The target temperature is about 450 °C to 560 °C and the duration of heating the foil to the target temperature is less than 4 minutes. The oxide layer is reformed so as to generate a reformed oxide layer that is an aluminum oxide with a boehmite phase and a pseudo-boehmite phase.

The application discloses a preparation method of a carbon-containing hydrodemetallization catalyst, and comprises the following steps: (1) roasting, crushing and screening aluminum nitrate, mixing the screened material with an aqueous solution containing propylene oxide and polyhydric alcohol, and hydrothermally treating the mixture, then filtering, washing and drying the treated material to obtain carbon-modified sheet-like pseudoboehmite P1; (2) mixing the pseudoboehmite P1 with pseudoboehmite P2 to obtain a mixture H0, and rolling the mixture to form an alumina carrier precursor S0; (3) mixing the S0 with the carbon-modified sheet-like pseudoboehmite prepared in the step (1), and continuously rolling the mixture to form a molding material, then drying and roasting the molding material to obtain an alumina carrier; and (4) impregnating the carrier with an active component impregnation solution, and drying and roasting the carrier to obtain a hydrodemetallization catalyst. The hydrodemetallization catalyst prepared by the method has high catalytic activity sites, large pore channels, high metal impurity and carbon deposition resistance, and high demetallization activity and stability in a residual oil hydroprocessing process.

The invention relates to the technical field of preparation of pseudo-boehmite, in particular to a method for co-producing peptizing pseudo-boehmite and pseudo-boehmite. The method comprises the following steps: introducing carbon dioxide into a sodium aluminate solution for carbonization reaction to obtain first neutralized slurry; performing first aging treatment on the first neutralized slurry, and filtering to obtain a first solid-phase material and a liquid-phase material; drying the first solid-phase material to obtain first pseudo-boehmite; aluminum sulfate and the sodium aluminate solution are subjected to parallel flow neutralization treatment and filtration, and a second solid-phase material is obtained; pulping the second solid-phase material and the liquid-phase material to obtain mixed slurry; carrying out second aging treatment on the mixed slurry, filtering and washing to obtain second pseudo-boehmite; and collecting the first pseudo-boehmite and the second pseudo-boehmite to obtain the peptizing pseudo-boehmite. According to the method, through a multi-layer and multi-step strategy, the regulation and control performance of the peptizing property of the pseudo-boehmite product is enhanced, and directional regulation and control of the pseudo-boehmite are realized.

A catalytic cracking catalyst and its preparation and use, the catalyst comprising a pseudoboehmite having specific crystal characteristics, a Y-type molecular sieve, a binder and clay; the pseudoboehmite having specific crystal characteristics has a D (130) = 4 nm to 10 nm, D (130) / D (020) = 1.0 to 1.5. The catalytic cracking catalyst has a rich mesopore distribution, in addition to the pore distribution at 3.8 nm, it has a mesopore distribution at a higher pore diameter. The catalyst is used for heavy oil catalytic cracking, and has good diffusion performance for heavy oil macromolecules and reaction intermediates and products, and the catalyst has low coke selectivity.

The invention relates to the technical field of gas purification, in particular to a composite adsorbent and a preparation method and application thereof.Pseudo-boehmite is loaded in pores and / or on the surface of porous activated carbon, and rich hydroxyl groups on the surface of the pseudo-boehmite are combined with oxygen-containing functional groups on the surface of the activated carbon through hydrogen-bond interaction; by using the composite carrier as a substrate, permanganate on the surface of the composite carrier interacts with hydroxyl on the surface of the pseudo-boehmite to realize high dispersion and strong anchoring, so that the composite adsorbent shows excellent stability, and the adsorption capacity of the adsorbent is improved. The adsorption efficiency and the saturated adsorption capacity are remarkably improved by controlling the relational expression of the pore volume of each stage and the loading capacity of the porous activated carbon.

The application discloses a kind of iron-containing pseudo-boehmite, anti-leakage oxygen protective sulfur recovery catalyst and preparation method, in the preparation method for preparing pseudo-boehmite using hydrothermal method, iron-containing compound, amphiphilic surfactant and organic solvent are added;During hydrothermal reaction, the amine group of the head of amphiphilic surfactant and the alkyl of tail are located in aqueous phase and oil phase respectively, the hydroxyl on the surface of pseudo-boehmite crystal nucleus and the amine group of the head of surfactant condensation reaction occurs, and oil-in-water Pickering emulsion reaction system is formed, and iron-containing pseudo-boehmite is finally prepared by reaction.The iron-containing pseudo-boehmite is formed and used as anti-leakage oxygen protective sulfur recovery catalyst, to avoid the problems of existing impregnation method for preparing iron-containing catalyst, such as a large amount of waste water and waste liquid generated in production process, and low iron utilization rate of catalyst.

The present invention provides a silicon-capturing catalyst, which is prepared as follows: an aluminum oxide precursor is uniformly mixed with an active metal salt or metal oxide, and an extrusion aid, a peptizing agent and water are then added and mixed, the mixture is extruded into strips, and then dried and sulfurized to obtain a catalyst precursor. An aluminum source and a precipitant are added to the precursor concurrently, a precipitation reaction is carried out, and the catalyst is aged, filtered, washed, and dried to obtain the silicon-capturing catalyst. The method of the present invention first prepares a precursor carrier by a kneading method. The kneading method coats the aluminum oxide precursor with the metal salt or metal oxide. Compared to the impregnation method, this method can prevent more aluminum oxide from being covered, thereby increasing the exposure of the aluminum oxide to the external surface and increasing the surface hydroxyl content. Pseudoboehmite is then loaded on the surface of the precursor to further increase the surface hydroxyl content of the catalyst.

The application discloses a preparation method of GO / Al2O3 composite ceramic ultrafiltration membrane, and comprises the following steps: step one, weighing graphene oxide into a container, adding distilled water, stirring and dispersing on a constant-temperature water bath magnetic stirrer, and then using an ultrasonic dispersing instrument for ultrasonic dispersion to obtain a graphene oxide dispersion liquid; step two, weighing pseudoboehmite, dissolving the pseudoboehmite in the graphene oxide dispersion liquid, stirring and dispersing on the constant-temperature water bath magnetic stirrer, then using a constant-pressure dropping funnel to drop a calculated amount of nitric acid, continuing to stir and gelatinize, and obtaining a GO / AlOOH mixed sol; step three, weighing a PVA solution and the GO / AlOOH mixed sol with a mass ratio of 1:1, stirring, and obtaining a coating solution; and step four, using an immersion method to coat the coating solution on the surface of a substrate. The preparation method of the GO / Al2O3 composite ceramic ultrafiltration membrane is simple in technological process, friendly to the environment, smaller in ceramic membrane pore size, and stronger in permeability.

The invention relates to a decomposition catalyst of perfluorinated compounds PFCs (Perfluorocompounds) and a preparation method of the decomposition catalyst, and provides a PFC decomposition catalyst, a 4-hole pill type or honeycomb type catalyst forming body and a preparation method of the 4-hole pill type or honeycomb type catalyst forming body. Zinc serving as an activity improving component and tungsten (W) and zirconium (Zr) serving as auxiliary components are added to one or more aluminum oxides selected from gamma aluminum oxide, aluminum hydroxide, boehmite and pseudo-boehmite, wherein the weight ratio of Al to Zn to W to Zr is 100: (20-100): (1-11): (20-100). The PFC decomposition catalyst according to the present invention has durability with respect to fluorine generated by PFC decomposition, also has a synergistic effect capable of improving reaction activity, and is capable of decomposing a perfluorinated compound at a low temperature compared to conventional PFC decomposition catalysts. Thus, it is possible to reduce the operating cost associated with continuous operation, while ensuring the durability of the system.

This invention provides a catalyst for the synthesis of sebacate, its preparation method, and its application. The catalyst comprises a support and an active component. The support is a modified alumina support, obtained by forming acidified pseudoboehmite sol using an oil-ammonia column method followed by a single calcination. The active component is a composite metal oxide containing transition metal oxides and rare earth metal oxides. The mass ratio of the support, transition metal oxide, and rare earth metal oxide is 100:(1~10):(1~10). The catalyst has a pore size distribution of >90% in the 10~50 nm range and an average pore size of 30~40 nm. The macroporous alumina support in this catalyst effectively matches the macromolecular size of sebacate, promoting reactant diffusion and product desorption, shortening residence time, significantly inhibiting sebacate imide side reactions, and achieving a selectivity of over 95%. Through the synergistic effect of the transition metal and rare earth metal composite oxide active component, the catalytic activity and anti-coking ability are improved, and the service life is extended to over 1200 hours.

The application relates to the technical field of alumina material preparation, in particular to a method for preparing filamentous pseudo-boehmite through static settling and aging and filamentous pseudo-boehmite. The method comprises the following steps: performing a carbonation reaction on carbon dioxide and a sodium aluminate solution to obtain a carbonation liquid; mixing water with a preset temperature and the carbonation liquid at a preset volume ratio to obtain a mixed slurry; wherein the temperature of the water is higher than that of the carbonation liquid; sequentially performing static settling and solid-liquid separation on the mixed slurry to separate microparticles and obtain supernatant; performing aging treatment on the supernatant to obtain an aging slurry; and performing post-treatment on the aging slurry to obtain filamentous pseudo-boehmite. The method utilizes the physical and chemical property differences of the components of the carbonation liquid, and realizes the enrichment and directional growth of target nano colloidal particles through heat water temperature control treatment + static settling separation + aging treatment, so that filamentous pseudo-boehmite products with good morphology and low impurity content are finally obtained.

The invention discloses a method for treating red mud slurry produced by aluminum oxide. The method comprises the following steps: filtering the red mud slurry, carbonating the red mud slurry by saturated carbon dioxide, separating the formed precipitate, washing with water and drying. Carbonation of the red mud slurry is carried out in two stages. The first-stage carbonation is carried out until the slurry reaches a certain pH value, and amorphous aluminum hydroxide precipitate is separated out at the moment; the carbonation solution is then sent to a second stage for carbonation until the slurry reaches another pH value, at which time pseudoboehmite is precipitated. The aluminum hydroxide powder with the pseudoboehmite structure and low impurity content can be produced by the method, and the method is suitable for production of cement mortar mixtures and alumina catalyst carriers.

The application discloses a kind of cobalt-containing multimetal bimodal pseudo-boehmite and its preparation method, and the preparation steps include: when pseudo-boehmite is prepared using hydrothermal method, water-soluble cobalt compound and water-soluble silver compound are added to aluminum source;Then through forming, shade drying, drying and calcination treatment obtain multimetal improved pseudo-boehmite finished product, and non-metal modifier is added in the forming process;Multimetal improved pseudo-boehmite finished product is immersed in potassium citrate solution, and acid-base adjustment is carried out to increase the basicity of carrier;Multimetal improved pseudo-boehmite after acid-base adjustment is used as carrier and is immersed in aqueous solution of molybdenum compound;Finally, after shade drying, drying and calcination, cobalt-containing multimetal bimodal pseudo-boehmite catalyst is obtained.The preparation method designed by the application makes the distribution of cobalt and molybdenum in the catalyst more uniform, and the molybdate impregnation process is simple and controllable, which is conducive to improving the performance of the catalyst.

A method for producing the polycrystalline alumina abrasive grains at a low cost, and a grindstone using the polycrystalline alumina abrasive grains. The production method includes a step of obtaining a liquid mixture of pseudo-boehmite, predetermined silica, and water; a step of adding a deflocculant to the liquid mixture to obtain a sol; a step of adding alumina seeds to the sol to obtain a seed-containing sol; a step of drying the seed-containing sol, crushing a residual content, and then performing calcination at 550° C. or more and less than 1,200° C.; and a step of performing firing at 1,200° C. to 1,500° C. provides the polycrystalline alumina abrasive grains including an alumina content of 95.0% by mass or more and a silica content of 0.05 to 3.30% by mass, with a grain size of 0.100 to 0.400 um, and a Vickers hardness of 21.00 or more.

The present application relates to the technical field of catalytic cracking, and discloses a catalytic cracking catalyst composition and a preparation method and application thereof. The catalyst composition comprises the following components based on the dry basis weight of the catalyst composition: 9.5-40 wt% of high colloidal solubility macroporous pseudoboehmite calculated based on alumina, 2-20 wt% of a binder, 20-50 wt% of a molecular sieve and 15-50 wt% of clay; the content of alumina in the high colloidal solubility macroporous pseudoboehmite is 98-100 wt%; the total pore volume of the catalyst composition is not less than 0.2 mL / g; and the mesopore volume of 4-10 nm in the catalyst composition accounts for more than 60% of the total pore volume. The catalyst has a high abrasion resistance index, a strong heavy oil conversion capacity and a high total yield of gasoline and diesel.

This application relates to a pseudoboehmite and its preparation method. The method includes: obtaining a pseudoboehmite slurry; adding an auxiliary agent and a dispersant to the pseudoboehmite slurry to carry out a chemical reaction, and controlling the temperature of the chemical reaction to obtain pseudoboehmite; wherein the chemical composition of the auxiliary agent includes NH4. + The dispersant promotes a single-crystal distribution of the grains. This application addresses the problem of large amounts of Na inclusions between the grains of pseudoboehmite prepared by existing carbide methods. + The technical problem of high water consumption due to difficulty in removal.

The invention relates to the technical field of pseudo-boehmite preparation, and discloses a method for preparing pseudo-boehmite through aluminum salt neutralization and pseudo-boehmite. The invention relates to a method for preparing pseudo-boehmite through aluminum salt neutralization, which comprises the following steps: (1) carrying out neutralization reaction on an aluminum sulfate solution and an alkaline solution to obtain neutralized slurry, and controlling the pH value of the neutralization reaction to be 8-10; (2) performing first aging on the neutralized slurry to obtain a first aged solid product, wherein the pH of the first aging is higher than that of the neutralization reaction; and (3) in the presence of a solvent, carrying out second aging on the first aging solid product to obtain a second aging solid product, and then drying the second aging solid product, the pH of the first aging being higher than the pH of the second aging. The method is simple in process, easy in control of operation conditions, easy in industrial implementation and low in cost, and the pseudo-boehmite prepared by the method is high in pore distribution concentration and crystallinity.