360 results about "Boehmite" patented technology

The invention discloses a lithium battery diaphragm coating based on a nano material and application thereof, and relates to the technical field of lithium battery diaphragms. The coating comprises the following raw materials in parts by weight: 15-25 parts of polystyrene maleic anhydride copolymer modified polyvinylidene fluoride, 10-20 parts of polystyrene, 2-4 parts of nano silicon nitride, 3-6 parts of a boehmite / aluminum oxide and silicon dioxide composite material, 1-2 parts of a dispersing agent and 65-90 parts of a solvent, according to the lithium battery diaphragm coating provided by the invention, the wettability and absorptivity of a diaphragm to an electrolyte are remarkably improved, meanwhile, the lithium battery diaphragm coating also has excellent thermal stability, and the diaphragm can be effectively prevented from thermal shrinkage or melting under a high-temperature condition, so that the safety performance of a battery is remarkably enhanced.

The invention relates to high-peptization pseudo-boehmite and a preparation method thereof, and belongs to the technical field of porous aluminum oxide preparation. The method comprises the following steps: obtaining slurry containing pseudo-boehmite colloidal particles; mixing the slurry containing the pseudo-boehmite colloidal particles with an alkaline auxiliary agent to obtain a mixed solution; and aging the mixed solution at a set temperature so as to enable the alkaline additive to perform surface modification on the pseudo-boehmite colloidal particles, thereby obtaining the high-peptizing-solubility pseudo-boehmite. According to the invention, the alkaline auxiliary agent acts on the colloidal particle surface of the pseudo-boehmite at a proper temperature, so that the pore structure of the pseudo-boehmite is maintained, and meanwhile, the pseudo-boehmite with high peptizing property is constructed.

The application discloses a porous aluminum-based carrier and a preparation method thereof, a CO2 adsorbent and application thereof. The preparation of the porous aluminum-based carrier comprises the following steps: segmental aging: a solution containing pseudo-boehmite is subjected to two-stage aging, the first stage is stirring aging, and the second stage is standing aging, the two kinds of aging modes are combined to improve the crystallinity of the pseudo-boehmite; organic solvent washing and pore expansion: the pseudo-boehmite is filtered out, and is subjected to water washing first and then organic solvent washing; segmental drying: low-temperature air blowing drying and vacuum drying are combined, the drying mode, the drying temperature and the solvent evaporation rate during drying are adjusted to avoid pore shrinkage or collapse caused by excessively high drying temperature and excessively fast solvent evaporation speed. The preparation of the porous aluminum-based carrier is simple in operation and low in energy consumption, and the CO2 adsorbent prepared from the porous aluminum-based carrier and an organic amine has excellent adsorption performance such as high adsorption capacity, fast adsorption rate and high stability.

The invention relates to the technical field of batteries, in particular to a diaphragm, a preparation method thereof and a lithium ion battery. The diaphragm comprises a base membrane and a coating located on the surface of at least one side of the base membrane, the base membrane comprises a polyvinyl alcohol membrane and first particles dispersed in the polyvinyl alcohol membrane, and the first particles comprise at least one of boehmite, aluminum oxide and zirconium oxide; the coating comprises second particles and a first binder, and the second particles comprise at least one of attapulgite, zeolite, sepiolite, montmorillonite and diatomite; the first binder comprises at least one of polyacrylonitrile, polyacrylic acid, an acrylic acid-acrylonitrile copolymer, an acrylic acid-acrylamide copolymer, an acrylonitrile-acrylamide copolymer, an acrylic acid-acrylonitrile-acrylate copolymer, an acrylic acid-acrylonitrile-acrylamide copolymer and an acrylic acid-acrylonitrile-acrylate copolymer. The diaphragm disclosed by the invention is good in thermal stability and liquid absorbency; comprising the diaphragm disclosed by the invention can improve lithium dendrites and cycle performance.

The invention provides a diaphragm with a gradient bulk density coating, a preparation method of the diaphragm, a battery and electric equipment, and relates to the technical field of diaphragms. The diaphragm with the gradient bulk density coating comprises a base material and a coating, and the coating is arranged on at least one side of the base material; the coating is prepared from the following raw materials: aluminum oxide, needle-like boehmite, a dispersing agent, an adhesive, an ether surfactant and water; the coating comprises multiple layers, the mass content of aluminum oxide is reduced layer by layer from the side adjacent to the base material to the side away from the base material, and the mass content of needle-like boehmite is increased layer by layer. And the obtained diaphragm with the gradient bulk density coating has high heat resistance, high wettability and high liquid retention rate.

The invention provides a method for preparing high-purity macroporous pseudo-boehmite, which comprises the following steps: putting organic aluminum alkoxide into a quartz tube of a tube furnace, then introducing mixed steam of water and an organic solvent into the quartz tube, enabling the organic aluminum alkoxide to be in contact with the mixed steam, and carrying out hydrolysis reaction to generate amorphous pseudo-boehmite, and carrying out aging treatment on the obtained amorphous pseudo-boehmite through a solvent / hydrothermal method to finally obtain the macroporous pseudo-boehmite with high purity and good crystallinity. The macroporous pseudo-boehmite prepared by the method has the advantages of simple and easy-to-control process flow, high product purity, easy recovery of hydrolysate and the like, and is suitable for industrial popularization and application.

The invention discloses a preparation device of pseudo-boehmite, which relates to the technical field of chemical equipment and comprises a reaction kettle, an electrode column, a grating and a stirring shaft. The invention also discloses a preparation method of the pseudo-boehmite preparation device. The preparation method comprises the following steps: material addition, colloid generation, aging, gibbsite conversion and repeated charging. The inner kettle and the outer kettle are arranged, a sodium aluminate solution and carbon dioxide are subjected to a neutralization reaction in the inner kettle to generate pseudo-boehmite colloid, part of gibbsite generated due to slow reduction of the pH value in the reaction process is precipitated at the bottom end of the inner kettle, and the pseudo-boehmite colloid can directly enter the outer kettle to be subjected to aging treatment after being generated; gibbsite can be heated at the bottom end of the inner-layer kettle to be converted into monohydrate gibbsite, and the monohydrate gibbsite can enter the outer-layer kettle along with subsequent pseudo-boehmite to be aged, so that the gibbsite can be directly converted and recycled in the preparation process of the pseudo-boehmite.

The invention provides a preparation method of pseudo-boehmite with high bulk specific gravity, and belongs to the field of pseudo-boehmite. The method comprises the following steps: carrying out a low-temperature neutralization reaction on an aluminum salt solution and a sodium metaaluminate solution, and keeping the pH value of a neutralized material at 6-6.5 in the reaction process to obtain amorphous precursor slurry; carrying out solid-liquid separation on the amorphous precursor slurry to obtain first mixed slurry; performing high-temperature aging crystal transformation reaction on the first mixed slurry and sodium carbonate to obtain macroporous pseudo-boehmite slurry; performing solid-liquid separation on the macroporous pseudo-boehmite slurry to obtain second mixed slurry; carrying out modification treatment on the second mixed slurry and acid or acid aluminum salt so as to re-agglomerate the non-peptized macroporous pseudo-boehmite to obtain third slurry; performing solid-liquid separation on the third slurry to obtain fourth mixed slurry; and carrying out spray drying on the fourth mixed slurry to obtain the pseudo-boehmite. Therefore, the bulk density of the pseudo-boehmite is improved.

The invention discloses a light diffusion polystyrene composite material with a low thermal expansion coefficient, a preparation method thereof and an application of the light diffusion polystyrene composite material in extrusion molding of a frameless television display screen backlight plate. The composite material is prepared from the following raw materials in parts by mass: 35 to 45 parts of GPPS (General Purpose Polystyrene) resin, 20 to 30 parts of HIPS (High Impact Polystyrene) resin, 8 to 15 parts of PPO (Polyphenylene Oxide) resin, 3 to 5 parts of compatilizer, 5 to 10 parts of light diffusant, 5 to 15 parts of filling mineral and 3 to 5 parts of liquid crystal polymer fiber, the filling minerals comprise one or more than two of high-whiteness nano synthetic mica, nano boehmite and magnesium sulfate whiskers; the whiteness L value of the high-whiteness nano synthetic mica is gt; 92; the average length of the magnesium sulfate whisker is 10-60 [mu] m, and the length-diameter ratio is gt; 30.

The invention belongs to the technical field of catalyst carrier materials, and particularly relates to a preparation method of mesoporous ultra-stable aluminum oxide. Pseudo-boehmite is prepared by adopting a double-aluminum method, alumina powder is obtained after roasting, a layer of fibrous pseudo-boehmite is prepared in the pore structure of the alumina powder, and the pore structure and the specific surface area of mesoporous super-stable alumina are controlled by controlling the crystallization pH value and the crystallization temperature in the reaction process. Sodium silicate and hexamethyldisilazane are added in the preparation process, so that the high-temperature stability of the mesoporous super-stable aluminum oxide is effectively improved, and the mesoporous super-stable aluminum oxide still has good specific surface area and pore volume under a hydrothermal condition. The mesoporous stable alumina is prepared by taking sodium metaaluminate and aluminum sulfate as main raw materials, and an organic solvent is not added as a template agent in the preparation process, so that volatilization of the organic solvent is effectively avoided, and the mesoporous stable alumina is green and environment-friendly.

The invention relates to the field of inorganic material preparation, and particularly discloses pseudo-boehmite and a preparation method thereof. A preparation method of pseudo-boehmite comprises the following steps: (1) mixing an aluminum salt solution and an aluminate solution, adding a crystal form regulating agent, and stirring for reaction to obtain a sol system; the crystal form regulating agent is ZnS quantum dots modified by thiohydracrylic acid; (2) adding a pore diameter guiding agent into the sol system, and aging for 6-8 hours; the pore diameter guiding agent is a compound of a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer and sodium citrate; and (3) carrying out solid-liquid separation on the aged sol system, and washing and drying the obtained solid to obtain the pseudo-boehmite. The proportion of 5-10nm pores of the pseudo-boehmite prepared by the preparation method disclosed by the invention reaches 90% or above, so that the pore distribution requirement of a fine catalytic reaction on the pseudo-boehmite can be met, and the efficient catalytic reaction is favorably realized.

The invention belongs to the technical field of spherical aluminum oxide preparation, and particularly discloses a method for preparing spherical aluminum oxide through an oil ammonia column forming process. The preparation method comprises the following steps: firstly, uniformly mixing pseudo-boehmite or boehmite powder with a dilute acid solution to prepare aluminum sol; the upper layer of the oil ammonia column is an oil phase, the lower layer of the oil ammonia column is an ammonia water phase containing a macromolecular thickening agent, and a surfactant is added to an interface while the aluminum sol is dropped into the oil ammonia column through a forming needle, so that the aluminum sol is pelletized and gelled and cured. And finally, taking out the gel beads, drying and roasting to obtain the spherical alumina carrier. The spherical aluminum oxide prepared by the method is high in sphericity degree and high in crushing strength, and can be used as a catalyst carrier for various catalytic reactions.

The invention belongs to the technical field of inorganic powder, and discloses low-radioactivity spherical aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: adopting ultrapure water at 20-60 DEG C, and adding acid to adjust the pH value to be less than or equal to 2.5 to obtain acid liquor; taking aluminum hydroxide / boehmite / industrial alumina as raw materials, adding the raw materials into the acid liquor, and stirring and dispersing to obtain mixed slurry A; adding alkaline anion exchange resin into the mixed slurry A, carrying out hydrothermal stirring treatment for 8-12 hours, and removing the alkaline anion exchange resin to obtain mixed slurry B; carrying out suction filtration and drying on the mixed slurry B, and carrying out heat preservation treatment on the dried material at 1300-1400 DEG C for 6-9 hours; and S4, crushing and dispersing the material subjected to heat preservation treatment in the step S4, and melting and spheroidizing at 1100-1300 DEG C to obtain a low-radioactivity spherical aluminum oxide crude product. The prepared low-radioactivity spherical alumina powder is compact in structure, high in thermal conductivity, low in uranium content and suitable for EMC production and application.

The invention belongs to the field of abrasive material preparation, and particularly relates to a preparation method of a mixed ceramic corundum abrasive material, which is characterized by comprising the following steps: 1) putting alumina powder into a ball milling tank, adding water with the same mass as the alumina powder, and carrying out ball milling until the particle size of powder d50 is 8-12 microns to obtain slurry A; (2) mixing boehmite powder, phosphoric acid with the mass concentration of 20-30% and water according to the mass ratio of 1: 4.5: 4.5, and stirring to a sol state to obtain slurry B, the particle size of particles d50 in the slurry B being less than 1 mu m; 3) mixing the slurry A, the slurry B and white corundum particles with d50 particle size of 25-35 [mu] m according to a mass ratio of 2.8-3.2: 4.5-5.5: 3, adding a shrinkage binder and a sintering aid, mixing again, and drying the mixed slurry in a drying chamber at 80 DEG C. 4) calcining to obtain a blocky abrasive material, and 5) crushing and grading The method has the advantages of simple process, less equipment investment, low production cost, good microcosmic compactness and high density of the abrasive material.

The invention provides boehmite and a preparation method thereof, and the preparation method comprises the following steps: mixing ammonium alum, an alkaline additive and a solvent to obtain a mixed solution, and carrying out hydrothermal treatment on the obtained mixed solution to obtain boehmite. According to the preparation method provided by the invention, the ammonium alum is adopted as a raw material and is mixed with the alkaline additive and the solvent, and then hydrothermal treatment is performed to prepare the boehmite, so that the preparation cost is relatively low, and the boehmite is obtained through one-step reaction, and therefore, the preparation method has the advantage of simple preparation process; in addition, in the preparation method, one or more impurity removal processes do not need to be carried out on the ammonium alum, so that the preparation process is further simplified, and the preparation cost is reduced.

The invention provides a preparation method of sphere-like nano boehmite and sphere-like nano aluminum oxide, and belongs to the field of fine aluminum oxide. The method comprises the following steps: carrying out acid pickling pretreatment on industrial alumina powder to obtain a first pretreated raw material; carrying out hydration reaction on the rho-aluminum oxide to obtain second pretreatment slurry containing boehmite and Bayer stone; mixing the first pretreatment raw material, the second pretreatment slurry, a pH regulator and a crystal growth regulator to obtain mixed slurry; the mixed slurry is subjected to a hydrothermal reaction, and the sphere-like nanometer boehmite is obtained. Boehmite generated by low-temperature hydration of a raw material rho-aluminum oxide is used as a seed crystal to reduce the hydrothermal reaction temperature, and a pH regulator and a crystal growth guiding agent cooperate to promote the growth speed of each crystal face, promote the centripetal contraction force of liquid surface molecules and promote the boehmite generated by the hydrothermal reaction to be in a sphere-like shape. Therefore, the invention provides the preparation method of the sphere-like nano boehmite which is short in process and complete in crystallinity.

The invention discloses a preparation method of a gasoline car honeycomb ceramic carrier with an ultralow thermal expansion coefficient, and belongs to the technical field of honeycomb ceramic materials. The method comprises the following steps: selecting raw materials; performing pretreatment; mixing the materials; kneading mud; performing extrusion molding; and cutting and firing to obtain the cordierite honeycomb ceramic carrier. A magnesium source in talc and a part of an aluminum source in alpha-aluminum oxide are replaced by the monohydrate boehmite and the magnesium oxide which are higher in reaction activity, the sol is formed through a complexation reaction with citric acid, then the sol is mixed with silicon dioxide and aluminum oxide particles, the reaction activity of a solid-phase reaction is improved at the same firing temperature, and the solid-phase reaction time is shortened. The thermal expansion coefficient of the cordierite honeycomb ceramic carrier is effectively reduced, and the thermal shock resistance requirement of gasoline cars in the national sixth emission standard can be met.

The invention belongs to the technical field of aluminum oxide ceramics, and particularly relates to a high-strength 99 aluminum oxide ceramic as well as a preparation method and application thereof. The boehmite and the hydrotalcite are used as main components of a binder, the boehmite and hydrotalcite composite sol is obtained by adopting a specific preparation method, and the boehmite and hydrotalcite composite sol is applied to a preparation process of aluminum oxide ceramics, so that an aluminum oxide ceramic material with high strength and high density can be obtained. Besides, the sintering aid adopted by the invention can react with MgO and Al2O3 generated by decomposition in the binder to generate a low-melting-point liquid phase, so that redistribution of substances among particles and filling of pores are facilitated, and the density and the dielectric property are further improved.

The invention relates to the technical field of alumina material preparation, in particular to macroporous pseudo-boehmite and a combined preparation method thereof. The preparation method comprises the following steps: carrying out neutralization reaction on carbon dioxide and a sodium aluminate solution to obtain neutralized slurry; performing first aging treatment on the neutralized slurry to obtain first aged slurry; filtering the first aged slurry to obtain a solid-phase material and a liquid-phase material; sequentially washing and drying the solid-phase material to obtain a first macroporous pseudo-boehmite product; aluminum sulfate and the sodium aluminate solution are subjected to parallel flow neutralization, and aluminum hydroxide slurry is obtained; mixing the aluminum hydroxide slurry with the liquid-phase material, and then carrying out second aging treatment to obtain second aged slurry; performing post-treatment on the second aged slurry to obtain a second macroporous pseudo-boehmite product; and collecting the two macroporous pseudo-boehmite products in batches. According to the preparation method, pseudo-boehmite with different pore structure characteristics is respectively prepared through two neutralization technologies based on three mechanisms of staged treatment, material recycling and structure complementation.

The invention relates to a preparation method of a ceramic membrane, in particular to a preparation method of a three-layer ceramic composite membrane. According to the invention, the Al2O3 film layer is prepared on the macroporous carrier by using the boehmite sol film preparation liquid in advance, and the TiO2 film layer is prepared on the Al2O3 film layer, so that cracking of the TiO2 film layer can be avoided. And after the TiO2 sol membrane preparation liquid is coated, the three-layer ceramic composite membrane is subjected to freeze drying by adopting a vacuum freeze dryer and then is calcined, so that the prepared three-layer ceramic composite membrane has the advantage of large flux while membrane layer cracking is avoided.

The invention discloses a continuous synthesis device and method for pseudo-boehmite, and belongs to the field of chemical material synthesis. The device comprises a raw material storage tank, a rotary liquid membrane reactor, a stirring tank, a tubular reactor, a vibration motor and a heating device. Three raw materials stored in different raw material storage tanks are conveyed into a liquid membrane reactor through a pump in a parallel flow mode, slurry generated after reaction flows into a stirring tank by means of gravity and then is conveyed into a tubular reactor which is placed in a heating device and preheated to a set temperature through a pump, and the tubular reactor and a vibration motor are fixed to the same vibration platform. The vibration motor is arranged outside the heating device, and vibration waves generated during operation of the vibration motor are conducted to the tubular reactor through the vibration platform. The slurry is aged in the tubular reactor and enters a product collecting tank after flowing out. The obtained pseudo-boehmite is uniform in particle size distribution, the particle size fluctuation range is small in the continuous synthesis period, energy consumption is reduced through continuous preparation, and efficiency is improved.

The invention relates to a boehmite reaction kettle water circulation cooling system, and relates to the field of reaction kettle cooling equipment, the boehmite reaction kettle water circulation cooling system comprises a reaction kettle, a preheating tank, a water storage tank with a water inlet and a water outlet, and a heat exchanger, a cooling pipe is arranged in the reaction kettle, one end of the cooling pipe is a first water inlet end, and the other end of the cooling pipe is a first water outlet end; a heating pipe is arranged in the preheating tank, one end of the heating pipe is a second water inlet end, and the other end of the heating pipe is a second water outlet end; the second water inlet end is communicated with the first water outlet end; a water inlet of the water storage tank is communicated with the second water outlet end; the hot water inlet end of the heat exchanger is communicated with the water outlet of the water storage tank, and the cold water outlet end of the heat exchanger is communicated with the first water inlet end of the cooling pipe. The method has the effect of improving the energy utilization efficiency.

The invention relates to the technical field of alumina modification, and particularly discloses a synthetic method of modified alumina, the synthetic method comprises the following steps: S1, dissolving a surfactant and a rare earth modifier 1 in a sodium metaaluminate aqueous solution to obtain a solution 1; s2, carrying out parallel flow on the solution 1 and an aluminum sulfate aqueous solution to prepare pseudo-boehmite slurry, stirring the pseudo-boehmite slurry, adding an organic solvent, dropwise adding a silane substance, continuously stirring, finally adding lanthanum nitrate, carrying out a reaction, and after the reaction is finished, filtering, washing and drying to obtain modified pseudo-boehmite powder; s3, roasting the modified pseudo-boehmite powder to obtain modified aluminum oxide; the synthesis method is simple in step and short in technological process, and the preparation time can be remarkably shortened while the thermal stability of the aluminum oxide is effectively improved.

The invention relates to a ternary positive electrode material and a preparation method thereof, a positive electrode and a battery, the ternary positive electrode material comprises an inner core and a coating layer coating the surface of the inner core, and the coating layer is prepared by roasting raw materials including boehmite and aluminum oxide; wherein the mass ratio of the boehmite to the aluminum oxide is (1-2.33): 1. The surface of the inner core is coated with the coating layer prepared by roasting the raw materials including boehmite and aluminum oxide, so that the stability and the conductivity of the positive electrode coating layer can be improved, and furthermore, the Li < + > mobility is improved, the metal dissolution is reduced, the impedance is reduced, and the cycle performance is improved.

The invention provides sphere-like aluminum oxide and a preparation method thereof, and the method comprises the following steps: preparation of boehmite powder: carrying out hydrothermal reaction on slurry in a high-pressure reaction kettle to convert aluminum hydroxide or gamma aluminum oxide into boehmite, and drying to obtain the boehmite powder; and preparing the spheroidic aluminum oxide: uniformly mixing the boehmite powder with an additive, calcining to convert the boehmite powder into aluminum oxide, and grinding to obtain the spheroidic aluminum oxide. The spheroidic alumina obtained by the method has good sphericity and good dispersibility, and the method is simple in production process, low in cost and easy to industrialize.

The invention provides diaphragm coating slurry, a composite diaphragm, a preparation method of the composite diaphragm and a lithium ion battery containing the composite diaphragm. The composite diaphragm comprises a porous diaphragm base material and a coating located on one side or two sides of the porous diaphragm base material, the coating comprises an active adsorption material, a coupling agent, a binding agent and a dispersing agent, the active adsorption material is selected from one or more of gamma-aluminum oxide, pseudo-boehmite, titanium hydroxide and a molecular sieve, and the coupling agent is selected from one or more of a coupling agent, a binding agent and a dispersing agent. The porosity of the composite diaphragm is greater than or equal to 40%. The composite diaphragm disclosed by the invention can greatly reduce the gas concentration in the battery, and meanwhile, the thermal stability, the electrolyte wettability and the porosity of the diaphragm are also improved to a certain extent.

The present invention belongs to the technical field of catalyst carrier materials, and specifically relates to a method for preparing mesoporous ultra-stable alumina. The present invention adopts a double aluminum method to prepare pseudo-boehmite, obtains alumina powder after calcination, and prepares a layer of fibrous pseudo-boehmite in the pore structure of the alumina powder. The pore structure and specific surface area of the mesoporous ultra-stable alumina are controlled by controlling the crystallization pH value and crystallization temperature during the reaction process, and sodium silicate and hexamethyldisilazane are added during the preparation process, which effectively improves the high-temperature stability of the mesoporous ultra-stable alumina, so that it still has good specific surface area and pore volume under hydrothermal conditions. The present invention uses sodium metaaluminate and aluminum sulfate as the main raw materials to prepare mesoporous stable alumina. No organic solvent is added as a template during the preparation process, which effectively avoids the volatilization of the organic solvent and is green and environmentally friendly.

The present invention relates to a low-ammonia ratio fixed-bed catalyst for preparing 6-aminocapronitrile by a vapor phase process and a preparation method thereof. The fixed-bed catalyst comprises the following components, based on 100 wt% of the total weight of the catalyst: a) 15-50 wt% of silicalite-1 molecular sieve; b) 10-30 wt% of aluminum nitride; c) 5-25 wt% of silicon oxide provided as silica sol; d) 5-10 wt% of aluminum oxide provided as pseudo-boehmite; and e) 5-10 wt% of attapulgite. The catalyst of the present invention exhibits high conversion and selectivity in the vapor phase process for preparing 6-aminocapronitrile under low ammonia ratio conditions, thereby improving the competitiveness of the device.

The invention relates to the technical field of preparation of nano boehmite, in particular to a preparation method and application of dispersed nano boehmite. The preparation method comprises the following steps: mixing an interfacial agent, urea and an aluminum salt aqueous solution through a sol-gel method to form a uniformly dispersed boehmite precursor solution; then, carrying out aging treatment on the precursor solution to form an aging reaction material; and finally, carrying out hydrothermal reaction to obtain a nano boehmite product with good dispersity under the conditions of high temperature and high pressure. According to the preparation method, a three-stage synergistic mechanism of uniform nucleation, dual stable agglomeration inhibition of an interfacial activity regulating agent and crystal face selective adsorption guide morphology evolution is realized through a urea slow-release alkaline environment, the technical bottlenecks of poor dispersity and uncontrollable morphology in traditional boehmite preparation are broken through, and finally, the preparation method has the advantages that the preparation efficiency is high, and the preparation cost is low. The purity of the obtained dispersing type nano boehmite is up to 99.9% or above, and the dispersing type nano boehmite has excellent physical properties.

Provided is a fluid catalytic cracking catalyst including faujasite-type zeolite, boehmite, a binder, and clay minerals, and satisfying the following formulas (1) and (2) in powder X-ray diffraction analysis:A / B≤1.2(1)A / C≥0.8(2)in the formulas (1) and (2), A is an integrated intensity of a diffraction peak attributed to (020) plane of the boehmite, B is an integrated intensity of a diffraction peak attributed to (120) plane of the boehmite, and C is an integrated intensity of a diffraction peak attributed to (331) plane of the faujasite-type zeolite.