25 results about "Peptization" patented technology

This invention provides a sulfur transfer aid, its preparation method, and its application. The sulfur transfer aid comprises 30%-70% magnesium oxide, 15%-60% aluminum oxide, 10%-15% cerium oxide, and 2%-5% vanadium pentoxide. The magnesium oxide is provided by a first magnesium source and a magnesium-aluminum matrix material, and the aluminum oxide is provided by a first aluminum source and a magnesium-aluminum matrix material. On a dry basis, the mass of the magnesium-aluminum matrix material is 5%-30% of the total mass of the raw materials of the sulfur transfer aid. The magnesium-aluminum matrix material is obtained by crystallizing a mixture of a second magnesium source and a second aluminum source after sol-treatment, and the magnesium-aluminum matrix material comprises magnesium oxide and aluminum oxide in a mass ratio of 0.2-0.8:1. This invention also provides a preparation method for the above-mentioned sulfur transfer aid and its application in catalytic cracking processes. This sulfur transfer aid can efficiently desulfurize and is suitable for industrial production.

A method for preparing a cracking catalyst includes combining a zeolite, an alumina binder, and phosphoric acid to form an extrusion mixture. The phosphoric acid acts as a peptizing agent. The extrusion mixture comprises from 0.000271 weight percent to 0.1 weight percent phosphoric acid based on the total weight of the extrusion mixture. The method further includes extruding the extrusion mixture to produce an extrudate. During the extruding, the phosphoric acid peptizes the alumina binder in the extrudate. The method further includes drying and calcining the extrudate to produce the cracking catalyst.

The application discloses a high-strength, large-pore-volume phosphorus-containing binder, characterized in that the binder comprises a glue, a curing agent and a modifier; the glue comprises a phosphorus-containing compound and an aluminum-containing compound; the curing agent comprises a gamma-aluminum oxide precursor, an acid and an alkylammonium salt, and the modifier is a metal chelate; wherein the colloidal solubility index of the gamma-aluminum oxide precursor is less than or equal to 50%; and the modifier is reacted with the glue in a high-shear dispersion emulsifier. The phosphorus-containing binder provided by the application, in combination with a conventional method, can obtain a catalytic cracking catalyst which, on the basis of high molecular sieve content and large pore volume, still has high wear resistance.

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.

The application belongs to the technical field of inorganic functional material preparation, and discloses an energy-saving preparation method of high-purity and high-crystallinity aluminum sol. First, pseudo-boehmite powder prepared by an alcoholate method is mixed with deionized water, and hydrothermal crystallization treatment is performed to enrich the hydroxyl group on the surface of the pseudo-boehmite and improve the peptization performance of the pseudo-boehmite, so that high-crystallinity pseudo-boehmite slurry is obtained; then, an acid peptizing agent is added to the obtained slurry, and hydrothermal peptization treatment is performed, and the high-purity and high-crystallinity aluminum sol is obtained after cooling. The application adopts a two-step hydrothermal process of 'hydrothermal crystallization-hydrothermal peptization', and the drying step in the previous process is omitted, so that the energy consumption is greatly reduced. The particle size of the obtained aluminum sol is less than 100 nm, the Zeta potential is stably maintained at more than 30 mV, the colloidal stability is excellent, and no precipitation is generated after being placed for 6 months. The application has a wide process window, high controllability and high product purity, and is suitable for the fields of catalysis, ceramics, coating and lithium batteries.

The invention relates to the field of preparation of pseudo-boehmite, and discloses pseudo-boehmite as well as a preparation method and application thereof, the content of sodium oxide in the pseudo-boehmite is lower than 0.3 wt%, the peptization index DI is 95-99.5%, the pore volume is 0.5-0.7 mL / g, and the retention rate of the pore volume after peptization is greater than 70%. The pseudo-boehmite has the advantages of high peptizing property, high pore volume retention rate after peptizing, large pore volume, small washing water consumption and low sodium oxide content.

The application discloses a high-strength, large-pore-volume and high-solid-content catalytic cracking catalyst and a preparation method thereof. The raw material of the catalytic cracking catalyst comprises a zeolite molecular sieve, a matrix and a binder. The matrix is composed of a gamma-alumina precursor with a peptization index of less than or equal to 50% and clay. The binder comprises a phosphorus-containing compound, an aluminum-containing compound and a multi-metal chelate. The catalytic cracking catalyst is prepared in a high-shear emulsifier. Compared with existing catalytic cracking catalysts, the catalytic cracking catalyst provided by the application has higher wear resistance, a large pore volume, a high molecular sieve content, a high solid content and excellent reaction performance.

This invention discloses a method for preparing an alumina support, belonging to the field of catalyst support technology. Addressing the shortcomings of existing alumina supports, such as difficulty in synergistically improving pore volume and strength, and poor hydrothermal stability, this invention uses boehmite as raw material and silk fibroin as a biomimetic template. The process involves solution preparation, sol-gel, template addition, molding, drying, and segmented calcination to obtain the product. The core innovation lies in utilizing the dual-structure characteristics of β-sheet crystalline and amorphous regions of silk fibroin, combined with the synergistic effect of selective β-sheet induction treatment and segmented calcination, to construct a hierarchical pore structure and strengthen the support framework. The resulting support has a pore volume of 1.2-1.8 mL / g, a lateral compressive strength of 220-350 N / cm, and after aging in steam at 800℃ for 12 h, a specific surface area and pore volume retention rate of ≥80% and ≥85%, respectively, overcoming the limitations of traditional techniques. This method is simple, compatible with existing production lines, and the product is suitable for harsh conditions such as heavy oil hydrogenation, showing broad application prospects.

This application discloses a method for preparing a rare-earth composite solid electrolyte coating material, relating to the field of solid-state battery technology, comprising the following steps: Step 1, modifying solid high-purity, highly colloidal alumina powder with rare-earth-based precursor powder to obtain a modified mixture; Step 2, subjecting the modified mixture to sequential acidification and high-speed stirring dispersion to obtain a slurry; Step 3, adding LATP solid electrolyte powder to the slurry and mixing and beating to obtain a coating material; wherein the modified mixture is obtained through surface coating modification or doping modification. This application has the effect of enhancing the ion transport capability of the coating material in solid-state batteries and improving chemical and thermal stability.

This invention provides a highly active catalytic cracking catalyst with low coke yield and its preparation method. The catalytic cracking catalyst comprises, by mass percentage, 26%–45% molecular sieve (dry basis), 20%–30% inorganic oxide binder (oxide basis), 0%–4% rare earth additive (oxide basis), 3%–10% magnesium-aluminum matrix material (dry basis), and 20%–50% clay (dry basis). The magnesium-aluminum matrix material is obtained by reacting boehmite with magnesium oxide via crystallization after solubilization. This catalytic cracking catalyst can increase the conversion depth and reduce coke yield. By reducing the coke yield of the catalytic cracking unit and increasing the yield of high-value-added products, it achieves a balance between the economic benefits of catalytic cracking and the goal of low-carbon and environmentally friendly development.

The application discloses a high-strength and large-pore catalytic cracking aid and a preparation method thereof. The catalytic cracking aid comprises a molecular sieve, a substrate, a binder and a metal chelate. The substrate is composed of a gamma-alumina precursor with a peptization index of less than or equal to 50% and clay. The binder is prepared from a phosphorus-containing compound and an aluminum-containing compound. The molecular sieve has an MFI structure, and the molecular sieve with a pore diameter less than 0.7 nm accounts for 50 wt% to 100 wt% of the total amount of the molecular sieve. The binder, the metal chelate and the substrate are mixed in a high-shear emulsifier. The catalytic cracking aid provided by the application can keep excellent wear resistance and strength under the premise of high molecular sieve content and large pore volume through the cooperation between the components and the dispersion and emulsification of the components in the high-shear emulsifier in the preparation process. When used as a propylene aid and an octane aid, the catalytic cracking aid can not only make the device run smoothly, but also improve the propylene and octane content.

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 belongs to the technical field of catalyst carrier preparation, and discloses a high-bulk-density tooth spherical alumina carrier and a preparation method thereof. According to the method, the water repellent agent and the retarder are added to cooperatively control the peptizing and gelling speeds of the materials, so that the kneaded material has plasticity and workability, the processing time can be shortened, the carrier yield can be increased, and the method is more suitable for industrial production; inert aluminum oxide with relatively high thermal conductivity is added as a reinforcing agent, so that the strength and thermal conductivity of the carrier can be improved, the material kneading time is shortened, the molding is easier, meanwhile, the use amount of a peptizing agent nitric acid is remarkably reduced, and the damage to the pore structure of the carrier is reduced; and by using a combined treatment process of microwave pre-drying shaping and common blast final drying, more open pore channels can be formed, so that the carrier is prevented from bursting and crushing due to adsorption heat in the impregnation process. According to the method, the production efficiency and the yield are greatly improved, and the method is more suitable for large-scale industrial continuous production.

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.

A pseudo-boehmite and a preparation method thereof, the pseudo-boehmite has a crystal grain size D (130) of 4-10 nm, and a specific surface area D (130) / D (020) of 1.0-1.5. The preparation method comprises the following steps: reacting a sodium aluminate solution with carbon dioxide gas, aging under certain hydrothermal conditions, washing and drying. The pseudo-boehmite prepared by the method has high crystallinity, large crystal grain size, large pore diameter and good peptization performance. The pseudo-boehmite is applied to a catalytic cracking catalyst, can produce obvious mesopore distribution under the condition that the strength of the catalyst is qualified, and significantly improves the pore structure of the catalyst, which has important significance for promoting the efficient diffusion of heavy oil macromolecules, reaction intermediates and product molecules in the catalyst, reducing the coke yield and optimizing the product distribution. The preparation method of the pseudo-boehmite is green and environmentally friendly, low in cost and easy to implement.

The invention discloses a multi-metal gamma-alumina pellet, which is characterized in that the pellet contains group IIIB metal and group IVA metal, the apparent bulk density is 0.20-0.80 g / mL, the specific surface area is 150-250 m < 2 > / g, the pore volume is 0.40-1.50 mL / g, the particle size is 1.60-2.50 mm, and the crushing strength is more than 80N / particle, and the preparation method comprises the following steps: adding an inorganic acid solution into an alumina suspension, peptizing for a certain temperature and time, and then adding an inorganic acid solution into the alumina suspension to obtain the multi-metal gamma-alumina pellet. The preparation method comprises the following steps: adding aluminum oxide suspension into an aluminum oxide solution to obtain aluminum oxide sol, forming, drying and roasting the aluminum oxide sol through an oil ammonia column to obtain aluminum oxide pellets, the aluminum oxide suspension contains soluble compounds of group IIIB metals and group IVA metals, and the conditional viscosity of the aluminum oxide sol is 15-30s. The reforming catalyst using the multi-metal gamma-alumina pellets as the carrier has the characteristics of high activity, high aromatic hydrocarbon selectivity and low carbon deposition rate.

The present application relates to the technical field of gas purification, and discloses a method for removing phosphine by using active alumina adsorbent suitable for high-temperature environment, which comprises the following steps: mixing pseudo-boehmite, light magnesium oxide, zinc oxide and boric acid to obtain dry base powder; adding reduced graphene oxide and aluminum sol to knead low-acidity mud; adding surface passivation type active heat-conducting precursor for secondary kneading; obtaining adsorbent through forming, drying, and inert atmosphere step-sintering; and finally, passing phosphorus-containing waste gas at high temperature for adsorption. Through the construction of graphene and modified aluminum nitride composite heat-conducting network, the present application solves the problem of high-temperature heat accumulation; by using zinc-boron glass phase and magnesium-aluminum spinel reinforced skeleton, the present application inhibits high-temperature phase transition and pore collapse; by using step-by-step kneading and surface passivation technology, the present application effectively prevents the hydrolysis of heat-conducting fillers, and improves the high-temperature stability and phosphine removal efficiency of the adsorbent.

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.

The application relates to the technical field of catalysts, and discloses a silicon-aluminum carrier catalyst, a preparation method and application. The preparation method of the silicon-aluminum carrier catalyst comprises the following steps: (1) mixing an acidic silicon-aluminum colloidal solution, low-silicon X molecular sieve, a precipitating agent, activated carbon and a soft template, drying silicon-aluminum mixed slurry obtained in the step, and obtaining a silicon-aluminum carrier; (2) mixing the silicon-aluminum carrier, colloidal pseudoboehmite and a binder, adjusting the pH value to 7-8, roasting the obtained mixture, and obtaining a strip-shaped silicon-aluminum carrier; (3) loading nickel-molybdenum-phosphorus on the strip-shaped silicon-aluminum carrier, and then reducing. The silicon-aluminum carrier catalyst prepared according to the method has the characteristics of high specific surface area, high activity, high stability and adjustable acidity, so that the catalytic activity in the application of heavy aromatic hydrocarbon pre-hydrogenation reaction is improved.

A method of making a particulate FCC catalyst and a particulate FCC catalyst that increases contaminant tolerance and is substantially free of clay. Thus, in one embodiment, a particulate FCC catalyst composition is provided that includes one or more zeolites, at least one alumina component, at least one silica component and is substantially free of clay. In another embodiment, a particulate FCC catalyst composition is provided that includes at least two different types of alumina and at least one silica component and is substantially free of clay. The alumina component can be selected from the group of peptizable metaborrstone, non-peptizable microcrystalline boehmite phase, non-peptizable alpha phase or non-peptizable alumina containing gamma phase or non-peptizable alumina containing chi phase or gibbsite alumina. The silica component can be selected from the group of low sodium stabilized colloidal silica and acid or low sodium or ammonia stabilized colloidal silica or polysilicic acid.

A method for preparing C2 to C5 hydrocarbons includes introducing a feed stream comprising hydrogen and a carbon-containing gas selected from the group consisting of carbon monoxide, carbon dioxide, and mixtures thereof into a reaction zone of a reactor, and converting the feed stream into a product stream comprising C2 to C5 hydrocarbons in the reaction zone in the presence of a formed mixed catalyst. The formed mixed catalyst comprises: a metal oxide catalyst component comprising gallium oxide and zirconium oxide, a microporous catalyst component as a molecular sieve having 8-MR (membered ring) pore openings, and an alumina binder, wherein the alumina binder is prepared as a colloidal solution, suspension, or gel by solubilizing a binder precursor comprising aluminum oxide or hydroxide with an organic carboxylic acid solution.

This invention discloses a modified aluminum sol, its preparation method, and its application, belonging to the field of aluminum sol technology. The method includes the following steps: At room temperature, a 2 mol / L aluminum trichloride solution is prepared using crystalline aluminum chloride and distilled water. A 6 mol / L ammonia solution is added dropwise to the aluminum trichloride solution until the pH of the system reaches 7-8. The solution is filtered, and the filter cake is washed to obtain an intermediate product. Another 2 mol / L aluminum trichloride solution is prepared, and the intermediate product is added to it. After stirring for 10 minutes, the temperature is raised to 60°C for 50-60 minutes to obtain an aluminum sol. The aluminum sol is ultrasonically dispersed at room temperature for 15 minutes and then transferred to a reaction vessel. The reaction temperature is controlled at 60°C, and auxiliary components are added under stirring conditions. The reaction is maintained at this temperature for 3 hours to obtain the modified aluminum sol. This invention does not add highly corrosive hydrochloric acid during the preparation of the modified aluminum sol, making it safe and environmentally friendly. Furthermore, the introduction of auxiliary components improves the stability and adhesion of the aluminum sol.

This invention discloses a high-porosity pseudoboehmite and its solvent-free preparation method. The preparation method specifically includes: first, heating and melting aluminum isopropoxide, then slowly adding it to deionized water under mechanical stirring to hydrolyze it, obtaining a semi-solid hydrolysis product; then, subjecting the hydrolysis product to a two-stage closed-loop semi-solid-phase aging treatment, i.e., first aging at a low temperature of 80-120℃, then aging at a high temperature of 140-180℃; finally, drying and pulverizing to obtain the high-porosity pseudoboehmite. This invention requires no additives or organic solvents, and achieves synergistic regulation of surface hydroxyl reconstruction and grain boundary anchoring through a two-stage aging process. The resulting product has a porosity retention rate ≥98% and a specific surface area of ​​300-400 m². 2 With a gel solubility index of ≥96%, it has the dual advantages of being green and environmentally friendly and having excellent performance, making it a promising candidate for industrial applications.

The invention discloses a preparation method of pseudo-boehmite, which comprises the following steps: mixing sodium hydroxide and aluminum hydroxide according to a Na / Al molar ratio of 1.5-4.5, and reacting at 80-130 DEG C for 10-12 hours to obtain a sodium aluminate solution; and carrying out a neutralization reaction on a mixed solution of oxidized cellulose and an aluminum salt and the sodium aluminate solution under the conditions that the temperature is 55-75 DEG C and the pH value is 6.5-8.5, after the neutralization reaction is finished, carrying out an aging reaction under the conditions that the temperature is 60-80 DEG C and the pH value is 7.0-9.0, and washing and drying to obtain the pseudo-boehmite. According to the method, specific sodium aluminate-aluminum salt-modified cellulose is taken as a raw material, and oxidized and modified cellulose is directly introduced into aluminate, so that the finally prepared pseudo-boehmite product has a fibrous structure, large specific surface area, large pore volume and high peptizing property, and has industrial application potential. In addition, the preparation method is simple and low in process cost.

The invention relates to the technical field of gas purification, and discloses a method for removing hydrogen phosphide by using an activated aluminum oxide adsorbent suitable for a high-temperature environment, and the method comprises the following steps: mixing pseudo-boehmite, light magnesium oxide, zinc oxide and boric acid to obtain dry base powder; adding reduced graphene oxide and aluminum sol for peptizing and kneading to obtain low-acidity pug; adding a surface passivation type active heat-conducting precursor for secondary kneading; the adsorbent is prepared through molding drying and inert atmosphere segmented sintering; and finally, introducing phosphorus-containing waste gas at high temperature for adsorption. According to the invention, a composite heat conduction network of graphene and modified aluminum nitride is constructed, so that the problem of high-temperature heat accumulation is solved; a zinc-boron glass phase and magnesium aluminate spinel are utilized to reinforce a framework, so that high-temperature phase change and pore channel collapse are inhibited; and step-by-step kneading and surface passivation technologies are adopted, so that hydrolysis of the heat-conducting filler is effectively prevented, and the high-temperature stability and dephosphorization efficiency of the adsorbent are improved.