214 results about "Pseudoboehmite" patented technology

The invention discloses preparation methods for a macroporous alumina carrier and a hydrodemetallization catalyst. The preparation method for the macroporous alumina carrier includes the following steps: (1) dry pseudoboehmite gel powder is hydrothermally processed under high pressure; (2) the dry pseudoboehmite gel powder obtained in step 1 is kneaded into a plastic, and pore-expanding agent is added in step 1 or step 2; (3) the plastic obtained in step 2 is shaped, the shaped material is dried and baked, and thereby the macroporous alumina carrier is obtained. The impregnation method is adopted to prepare the hydrodemetallization catalyst. The hydrodemetallization catalyst prepared by the method has large pore volume and pore diameter, centrally distributed pores, moderate mechanical strength and high activity and activity stability.

The invention discloses a preparation method of integrated large-hole alumina, belonging to a preparation technique of integrated multi-hole inorganic oxide. The method comprises the following process: reverse concentrated emulsion method is adopted to prepare integrated large-hole organic template taking cinnamene and divinylbenzene as monomer; aluminum isopropoxide or pseudoboehmite is primarily used for preparing Al2O3 hydrosol; the Al2O3 hydrosol is filled into the integrated large-hole organic template; the filled integrated organic/inorganic composites are dried and then are roasted to remove the template, so as to obtain the integrated large-hole alumina. The invention has the advantages of simple and feasible preparation process, moreover the prepared integrated large-hole alumina has micrometer grade communicated large-hole channels (1-50um). The invention is applicable for catalyst carrier, absorption materials and separation materials.

Provided are methods of preparing a separator for an electrochemical cell comprising the steps of (a) coating onto a substrate a liquid mixture comprising an inorganic oxide, an organic polymer, a divinyl ether of an ethylene glycol, and/or an organic carbonate; (b) drying the coating; and (c) delaminating the coating from the substrate to form the separator comprising an inorganic oxide and the organic polymer, wherein the inorganic oxide of step (c) comprises a reaction product of the divinyl ether and/or the organic carbonate with the inorganic oxide of step (a). Preferably, the inorganic oxide of step (c) comprises a hydrated aluminum oxide of the formula Al₂O₃.H₂O, wherein x is less than 1.0, and wherein the hydrated aluminum oxide comprises a reaction product of the divinyl ether and/or organic carbonate with the inorganic oxide of step (a), such as pseudo-boehmite.

A hydrothermally-stable catalyst, method for making the same, and process for producing hydrocarbon, wherein the catalyst is used in synthesis gas conversion to hydrocarbons. In one embodiment, the method comprises depositing a compound of a catalytic metal selected from Groups 8, 9, and 10 of the Periodic Table on a support material comprising boehmite to form a composite material; and calcining the composite material to form the catalyst. In other embodiments, the support material comprises synthetic boehmite, natural boehmite, pseudo-boehmite, or combinations thereof.

The invention discloses a preparation method for an alumina carrier, which includes the following steps: (1) dry pseudoboehmite gel powder and extrusion aid are uniformly mixed and then added into aqueous solution in which physical pore-expanding agent and chemical pore-expanding agent are dissolved; (2) the material obtained in step 1 is uniformly mixed and molded by extrusion on an extruder; (3) the material obtained in step 2 is dried and baked, and thereby the finished alumina carrier is prepared. The alumina carrier prepared by the method has large pore volume and pore diameter, centrally distributed pores and high mechanical strength, and is applicable to the preparation of heavy oil and residual oil hydrodemetallization catalysts and other fields.

Paint detackifiers and/or sedimentation agents are provided which contain amorphous alumina and/or alumina in pseudoboehmite or boehmite form having an average crystallite size of from 0.1 to 15 nm and/or the hydrates and hydroxyalkylpolysaccharides thereof.

A method for producing a hydrorefining catalyst is used to produce the hydrorefining catalyst which contains an inorganic oxide carrier and a hydrogenation-active metal and which has such a bimodal pore characteristic that pores having pore diameters of not more than 50 nm have a pore volume of not less than 0.4 cm³/g, pores having pore diameters of not less than 50 nm have a pore volume of not less than 0.2 cm³/g, and pores having pore diameters of not less than 1000 nm have a pore volume of not more than 0.1 cm³/g. The method comprises the steps of mixing and forming a pseudo-boehmite powder having a dispersibility index of 0.13 to 0.28, and calcinating the formed pseudo-boehmite under a condition in which the pseudo-boehmite is converted into γ-alumina. The hydrorefining catalyst, which has the bimodal pore characteristic, can be produced easily at low cost.

Provided are separators for use in an electrochemical cell comprising (a) an hydrated aluminum oxide of the formula Al₂O₃.xH₂O, wherein x is less than 1.0 and (b) an organic polymer, wherein the hydrated aluminum oxide comprises organic substituents. Preferably, x of the hydrated aluminum oxide is less than 0.8, or more preferably, x is less than 0.6. Preferably, the organic substituents comprise a reaction product of a multifunctional monomer, such as a divinyl ether of an ethylene glycol, and/or an organic carbonate with an aluminum oxide, such as pseudo-boehmite or a hydrated aluminum oxide.

A method of preparing pseudoboehmite is disclosed. The method includes preparing aluminium hydroxide precipitate, ageing, washing and drying. The preparation of the aluminium hydroxide precipitate adopts a reactor, wherein the reactor comprises a reactor cylinder and is provided with a stirrer inside, the bottom of the reactor cylinder is provided with two feeding ports, two material circulating pipelines are disposed outside the reactor cylinder, each of the material circulating pipelines is provided with at least one outlet, circulating material outlets are in the upper part of the reactor cylinder, inlets of the two material circulating pipelines are respectively connected to the two feeding ports through pipelines, and the upper part of the reactor cylinder is provided with an overflow port that is higher than the circulating material outlets. Pseudoboehmite particles prepared by the method are uniform in particle size, so that prepared aluminum oxide is large in pore volume, large in pore diameter and centralized in pore distribution, and the prepared aluminum oxide is uniform and constant in properties.

This invention discloses a pseudoboehmite and its preparation method. This pseudoboehmite is prepared by following steps: a) at acidity condition that can make aluminum precipitate, precipitate aluminum of aluminum compound water solution, separate, and get a kind of amorphous alumina hydrate; b) mix amorphous hydrated aluminum oxide with water and at least one kind of water-soluble alkali, slurry, stabilize at 20deg-90deg for 0.2-6 hours, wherein dosage of above alkali make serumal pH be 6-11. Compared with existing technique, pseudoboehmite prepared by this invention can get aluminum oxide of bore distributing localized by calcining.

The invention relates to a chemical mechanical polishing composite of stainless steel surface polishing; the polishing composite is composed of grinding material, oxidizer, polishing accelerant, metalchelator, penetrant, and surfactant; the invention is characterized in that: aluminum oxide sol, namely hydrated alumina dispersed in acidic aqueous solution in sol state, is added, the hydrated alumina can be boehmite, fake boehmite, diaspore or gibbsite.

An aluminum or aluminum alloy member superior in liquid and gaseous corrosion resistance and plasma resistance, which has an anodized film formed thereon which is composed of a porous layer and a non-porous barrier layer whose structure is at least partly boehmite or pseudo-boehmite. Said anodized film is characterized by that the film dissolving rate measured by the test for immersion in a mixture of phosphoric acid and chromic acid (conforming to JIS H8683-2) is less than 120 mg/dm<2>/15 min, the ratio of area in which corrosion occurs after standing for 2 hours in an atmosphere of argon containing 5% chlorine (at 300° C.) is less than 15%, and the hardness (Hv) of the film is no lower than 420.

A reactor and a method of preparing pseudoboehmite by the reactor are disclosed. The reactor comprises a reactor cylinder. A separating plate is disposed in the reactor cylinder to divide the inner cavity of the reactor into two zones along the axial direction. At least two material circulating pipelines are disposed outside the reactor cylinder. A circulated material outlet and a circulated material inlet in each material circulating pipeline are disposed in different zones. The circulated material outlets are at the upper part of the reactor cylinder and the circulated material inlets are at the bottom of the reactor cylinder. In each of the zones, the corresponding lower part of the reactor cylinder is provided with a material feeding port, and the corresponding upper part of the reactor cylinder is provided with an overflow port higher than the corresponding circulated material outlet. Continuous gel forming can be achieved by the reactor. Pseudoboehmite particles prepared by adopting the reactor are uniform in particle size, so that prepared aluminum oxide is large in pore volume, large in pore diameter and centralized in pore distribution, and the prepared aluminum oxide is uniform and constant in properties, and is not influenced by batch production scales.

A reactor and a method of preparing pseudoboehmite by the reactor are disclosed. The reactor comprises a reactor cylinder. A separating plate is disposed in the reactor cylinder to divide the inner cavity of the reactor into two zones along the axial direction, is disposed at a center shaft, and rotates along with rotation of the center shaft. In each of the zones, the corresponding lower part of the reactor cylinder is provided with a material feeding port, at least one material circulating pipeline is disposed outside the corresponding reactor cylinder, a circulated material outlet is at the upper part, a circulated material inlet is at the bottom, and the corresponding upper part of the reactor cylinder is provided with an overflow port higher than the corresponding circulated material outlet. Continuous gel forming can be achieved by the reactor. Pseudoboehmite particles prepared by adopting the reactor are uniform in particle size, so that prepared aluminum oxide is large in pore volume, large in pore diameter and centralized in pore distribution, and the prepared aluminum oxide is uniform and constant in properties, and is not influenced by batch production scales.

A process for preparing the alpha-AlO(OH) includes such steps as dissolving tricyanic acid in the sodium aluminate solution containing Al2O3, filtering, forming colloid at 50-90 deg.C, solid-liquid separation, filtering, washing to obtain filtered cake, baking, calcining and pulverizing.

The invention discloses a palladium alumina for production of hydrogen peroxide by an anthraquinone process. The catalyst comprises gamma-Al2O3 as the carrier, the content of which is over 97wt%; and metal palladium as the main active component, the loading of which is 0.1wt%-0.5wt% and the dipping thickness of which is from 10 micrometers to 100 micrometers. The invention also discloses a preparation method of the catalyst, and the method consists of: roasting aluminum hydroxide, mixing the roasted aluminum hydroxide with pseudoboehmite, then adding a pore-expanding agent for molding, conducting surface treatment so as to obtain a catalyst carrier, then performing pre-spraying on the carrier with a locating agent, carrying out drying, and then putting the carrier into a chloropalladate solution for dipping. With appropriate specific surface area, pore volume and pore size distribution, the palladium catalyst provided in the invention is difficult to shed and fragment. In actual production of hydrogen peroxide by an anthraquinone process, the catalyst shows excellent balance between activity and selectivity, as well as good service life and regeneration cycle.

The invention discloses a ceramic honeycomb type denitrating catalyst. The ceramic honeycomb type denitrating catalyst is formed by mixing, forming and calcining a catalyst active ingredient, a catalyst carrier and a forming aid, wherein the catalyst active ingredient is ferrous sulphate. In an embodiment, the catalyst active ingredient comprises 20 to 40 weight parts of the ferrous sulphate; thecatalyst carrier comprises 60 to 90 weight parts of molecular sieve; the forming aid comprises 2 to 4 weight parts of citric acid, 2 to 6 weight parts of sodium carboxymethylcellulose, 2 to 6 weight parts of polyoxyethylene, 0.2 to 1.0 weight part of glycerol, 2 to 4 weight parts of nitric acid, 90 to 120 weight parts of pseudoboehmite, 30 to 40 weight parts of Suzhou clay, 2 to 6 weight parts ofsesbania cannabina pers powder and 10 to 30 weight parts of glass fiber. The raw materials of the catalyst have low cost and do not have toxicity. The denitrating catalyst module has high denitratingefficiency and certain anti-poisoning property and mechanical strength.

The invention discloses a catalyst for preparing methylbenzene by methanol conversion, which comprises, by weight, 30%-80% of composite molecular sieves, 0.1%-10% of modifier elements and the balance being binders. The composite molecular sieves are selected from SAPO-34, SAPO-11, HZSM-5, HZSM-22, HZSM-11, MCM-41, MCM-22, HBeta, HY, MOR or EUO; the modifier elements are selected from Cr, Mo, W, Cu, Zn, Fe, Co, Ni, Ga, Sn, Zr, Mn, Pd, Pt and Re; and the binders can be aluminum oxide, pseudoboehmite, silicone gel, silicon dioxide or diatomaceous earth. The catalyst for preparing methylbenzene by methanol conversion and a preparation method thereof have the following advantages that (1), the total recovery of methylbenzene is higher and the selectivity thereof is also higher; (2) raw material handling capacity is high; (3), non-aromatic and butylene products circularly enter a reactor to realize further reaction so that the total aromatic recovery and balanced reaction thermal effect areimproved; (4), non-aromatic liquid products can be used as solvent oil or gasoline components; and (5), the catalyst has long service life.

The invention relates to a CO (carbon monoxide) sulfur tolerant shift catalyst applicable to a high pressure process and a preparation method thereof. The CO sulfur tolerant shift catalyst applicable to the high pressure process comprises a carrier and a catalyst active component, wherein the carrier is prepared from the following materials by mass percent: 5-40% of modified bauxite powder, 20-60% of pseudoboehmite or aluminum nitrate, and 10-40% of magnesium oxide or magnesium hydroxide; the catalyst active component comprises CoO, MoO3 and CeO2; and CoO is 0.5-5% of the weight of the catalyst, MoO3 is 1.0-15% of the weight of the catalyst and CeO2 is 0.3-2% of the weight of the catalyst. The preparation method comprises the following steps: raw materials mixing; kneading; strip extruding; roasting; isometric impregnation, and the like. The preparation process is simple and no waste water is discharged. The prepared catalyst carrier has excellent hydration resisting property and strength. The activating temperature of the catalyst is low. Under the conditions of high pressure, high gas to steam ratio and high temperature, the catalyst has excellent thermal stability.

A method for preparing cracking catalyst. The method comprises making catalyst slurry having a homogeneous distribution of molecular sieve slurry, pseudoboehmite, clay, inorganic acid and aluminum-containing binder; and subsequent spray drying. Inorganic acid is added prior to the addition of pseudoboehmite; addition of molecular sieve is added after the addition of inorganic acid; and a phosphatic dispersant is added during preparation. Compared to conventional methods of preparing FCC catalyst slurry, the inventive catalyst slurry viscosity is decreased and the fluidity thereof is improved, while catalyst anti-friction is maintained. The solid content of the FCC catalyst slurry can be increased to about 40% or more. The gel forming time is significantly reduced with increased productivity and decreased catalyst production cost. Meanwhile, the catalyst has high pore volume and improved micro-reactivity. Overall reactivity performance of the catalyst is also improved.

A method of hydrotreating a heavy hydrocarbon feedstock using a hydrotreating catalyst having specific properties that make it effective in removing nitrogen and sulfur from the feedstock is disclosed. The catalyst is composed of an alumina support particle having a specific pore diameter distribution which is achieved in part, by the use of pseudo-boehmite as the alumina source and specific calcining temperatures. The hydrotreatment catalyst also comprises a Group 6 metal component (e.g., molybdenum) and a Group 10 metal component (e.g., nickel), and optionally, a phosphorus metal component, which are supported by the alumina support particle.