Abstract: A peroxide group containing complex of aluminum, oxygen and hydrogen is obtained having an aluminum/oxygen atomic ratio of about 1:3.The complex is prepared by reacting, at a temperature below 150.degree. F, aluminum metal of a purity of at least 99.98% by weight with a source of hydrogen ions, such as an aqueous inorganic halogen acid, in the presence of mercury and an oxygen gas-containing atmosphere, the aluminum being partially immersed in the mercury and the source of hydrogen ions, comprising a thin film over the mercury. The thickness of this film is insufficient to cover the aluminum not immersed in the mercury, whereby a portion of the aluminum is exposed to the oxygen gas-containing atmosphere. The complex grows from the exposed surface of the aluminum in the form of an easily frangible self-supporting sheet.

Abstract: Alumina, derived as by-product of the Zeigler-catalyzed higher alcohol process, is converted to beta alumina trihydrate and alpha alumina trihydrate in controlled proportions and thence to the catalytic transition aluminas.

Abstract: Granular active alumina with high mechanical durability is made by activation of an aluminum hydroxide with an apparent density in the green granular condition of at least 2.20g/cm.sup.3. The green aluminum hydroxide is subjected to compacting by dry compression before activation by a usual heat treatment. Compacting is preferably by running between two rollers.

Abstract: Production of solid, hollow and spheroidic material for use as a carrier supporting motor exhaust gas decontamination catalysts. To this end, spheroidal particles of material being oxidizable and/or low melting and/or soluble in organic solvents are placed on to a pelletizing table. Ceramic pulverulent material is distributed thereover and a aqueous cellulose ether solution is simultaneously sprayed thereonto to cause deposition of the ceramic material on the particles. The resulting pellets are dried at 20.degree. - 95.degree. C and freed from material being oxidizable and/or low melting and/or soluble in organic solvents, and finally calcined at 1000.degree. - 1500.degree. C.

Abstract: A catalyst obtained by admixing red mud with alumina or/and an alumina-containing substance, optionally adjusting the water content of the admixture and/or adding an organic binder to the admixture, kneading and shaping the admixture into pellets having suitable size and shape, and calcining the pellets at 600.degree. to 1,100.degree. C. The catalyst has a high compression strength and can, when used in the hydrodemetallization of hydrocarbons, achieve a high rate of demetallization and a low yield of low boiling fractions. The rate of demetallization is enhanced when the process is carried out using a hydrogen feed containing hydrogen sulfide.

Abstract: Alumina particles derived from hydrous alumina predominating in .alpha.-alumina monohydrate having a crystallite size of less than 100A and having increased porosity can be prepared by a process which comprises forming a mixture of an aqueous slurry of the hydrous alumina and at least one surface active agent, drying this mixture, forming macrosize particles from the dried mixture and calcining the macrosized particles.This invention relates to improved alumina and alumina-based particles. More particularly, the invention relates to the manufacture of alumina and alumina-based particles having improved physical properties and being useful, for example, as catalysts and catalyst supports.Alumina-based catalysts are useful in many industrial applications, e.g., petroleum reforming and desulfurization, aromatization, paraffin and aromatic hydrocarbon isomerization and the like. In many of these applications the activity of the alumina-based catalyst is directly related to the porosity, i.e.

Abstract: Disclosed is a process for preparing shaped alumina particles for catalysts or catalyst supports by passing droplets of an aqueous slurry of a rehydratable alumina composition through a shaping medium, such as a column of water-immiscible liquid. The alumina composition undergoes rehydration while being shaped as it passes through the shaping medium, and accordingly, firm, discrete alumina bodies are produced.

Abstract: Formed products are made from aqueous aluminum oxyhydrate by peptizing the aqueous aluminum oxyhydrate with an acid and then subsequently adding a dilute solution of ammonia or an ammonia yielding compound following by extrusion, drying and calcining.

Abstract: A method of preparing an extruded catalyst composition. An acidic alumina hydrosol is admixed with a dry mixture consisting essentially of a finely divided alumina and a finely divided crystalline aluminosilicate. The resulting mixture is extruded, dried and calcined to yield a catalyst particularly useful for the selective reforming of a naphtha fraction to produce a high octane reformate product and a liquid petroleum gas.

Abstract: A hydroperoxy-group-containing aluminum compound is prepared by a process which comprises:Contacting and reacting, at room temperature or below, and in the substantial absence of water, (a) a reactive metal comprising aluminum of a purity of at least 99.9% by weight permeated with a liquid metal selected from mercury, gallium and indium/gallium alloys with (b) a liquid reactant comprising (i) hydrogen peroxide in (ii) a liquid organic compound having no multiple carbon-to-carbon bonds.The aluminum compounds produced can be used, for example, as substrates for electronics, in the preparation of synthetic gems, ceramics and paint pigments. The aluminum compound is prepared in sheet for plate form, resembling mica in physical appearance.In an alternative embodiment, a metal or metal salt is added to the reactive system to yield a hydroperoxy-group-containing aluminum compound with the desired metal deposited thereon.

Abstract: Alumina having a surface area from about 250 to about 500 m.sup.2 /g, a loose bulk density from about 10 to about 30 lbs/ft.sup.3, a pore volume (0-10,000 A) from about 0.6 to about 2.5 cc/g and a pore volume (0-1,000 A) of at least 0.6 cc/g wherein 70 to 95 percent of said pore volume (0-1,000 A) consists of pores having a diameter in the range of 35 to 80 A and a method for producing such alumina by the water hydrolysis of aluminum methoxide.

Abstract: Oxide microspheres having a diameter in the 0.5 to 20 micron range are produced by forming a mixture of urea or melamine and formaldehyde in an aqueous sol containing colloidal oxide particles. Copolymerization of the organic constituents produces coacervation of the organic material into microparticles containing the inorganic material. The organic constituent can be burned out to form a powder of uniform-sized porous microparticles consisting of an interconnected array of inorganic colloidal particles separated by uniform-sized pores.

Abstract: High pore volume alumina materials which are particularly effective catalyst supports are prepared by treating a calcined alumina with an organic acid such as ethanedioic acid. The acid treatment changes the pore structure of the alumina and particularly increases the macroporosity of the alumina.

Abstract: A high-porosity, high-surface area, low-density alumina and a method for preparing said alumina. The alumina typically has a surface area from about 260 to about 400 m.sup.2 /g, a pore volume from about 1.0 to about 2.75 cc/g, a loose bulk density from about 7.5 to about 25 lb/ft.sup.3, and is produced by contacting aqueous alumina slurries with an effective amount of an organic solvent and drying the resulting solvent-aqueous alumina mixture.

Abstract: Pure, high surface area alumina is produced by the reaction of aluminum salts with lower aliphatic epoxides in an aqueous media and is washed with aqueous solutions of ammonia which have a pH of at least 7.

Abstract: Alumina having improved color characteristics and improved extrusion properties is produced by an improvement in the process for producing low-density, high-porosity, high-surface area alumina from an aqueous alumina slurry by contacting said aqueous alumina slurry with an effective amount of an organic solvent to form a solvent-aqueous alumina mixture; drying said mixture and recovering said low-density, high-porosity, high-surface area alumina, comprising drying said solvent-aqueous alumina mixture in an inert atmosphere.

Abstract: A method for producing concentrated alumina slurries containing from about 14 to about 20 weight percent Al.sub.2 O.sub.3 by forming a solvent-aqueous alumina mixture and evaporating solent-aqueous vapor from said mixture to produce said concentrated alumina slurries.

Abstract: Low-density, high-porosity alumina extrudates and a method for preparing said extrudates. Said method comprises admixing finely divided low-density, high-porosity alumina with water to form an extrudable composition and extruding said mixture.

Abstract: Alpha alumina monohydrate wherein a majority of the cumulative pore volume consists of pores from about 30 to about 120 A in diameter and a method for producing such alumina. This is a continuation of application Ser. No. 298,116, filed Oct. 16, 1972 and now abandoned.

Abstract: A method of preparing spheroidal refractory inorganic oxide particles characterized by low bulk density in combination with high micropore volume is disclosed. The particles, especially low bulk density - high micropore volume alumina particles, are useful as a support or carrier material for catalytically active materials to yield an improved hydrocarbon conversion catalyst.

Abstract: A process for preparing aluminium oxide beads from alumina hydrogel, which comprises polymerizing, in a hot and substantially water-immiscible fluid, an aqueous mixture comprising alumina hydrogel and alumina hydrosol and a water-soluble monomer whose uncross-linked polymer is water-soluble or forms a gel, this mixture being dispersed as droplets into a hot fluid in which substantial polymerization of the monomer occurs.

Abstract: Dispersible colloidal particles of .alpha. alumina monohydrate are prepared by conditioning aqueous solutions of an aluminum salt with an organic solvent and the precipitating alumina with an aqueous solution of base. The reaction mixture is heated under pressure, filtered, washed and dried to obtain the product.

Abstract: A process for preparing aluminum oxide beads from alumina hydrogel, comprising polymerizing in a hot and substantially water-immiscible fluid, an aqueous mixture which contains alumina hydrogel and a water soluble monomer whose uncross-linked polymer is water soluble or forms a gel, this mixture being dispersed as droplets into said fluid in which substantial polymerization of said monomer is performed.

Abstract: High surface area alumina materials, which are particularly effective catalyst supports or carriers, are prepared by heating alumina monohydrate, alumina trihydrate or mixtures thereof from 450.degree.-500.degree. to at least 800.degree.F in the presence of excess elemental chlorine. The heating of the alumina material with elemental chlorine is conducted prior to said alumina material being heated to a temperature above about 450.degree.-500.degree.F in the absence of elemental chlorine. The alumina monohydrate or trihydrate compositions are derived from the aqueous phase reaction of ethylene oxide with aluminum chloride and/or aluminum hydroxychloride.

Abstract: Highly active aluminum oxide characterized by a severely disturbed crystalline structure of .chi.-(chi-)aluminum oxide, a specific surface area of about 260 to 400 m.sup.2 /g according to BET, a residual water content of 2 to 10 % and a water absorption capacity at 50 % relative atmospheric humidity of more than 15 %, and process of producing same by heating aluminum hydroxide to a temperature of 350.degree. to 800.degree.C with a residence time of from 0.1 to 2 seconds in a zone of high turbulence in a hot gas which enters said zone at a temperature of about 500.degree. to 1200.degree.C at an inflow rate of 30 to 150 m/second. These highly active aluminum oxide may be formed into beads by grinding said aluminum oxide to a specified particle size and forming the aluminum oxide under addition of water.

Abstract: Minute amounts of boron present in naturally occurring brines found in oceans, inland seas, salt lakes and the like are removed by treating the brine with an oxide of aluminum.

Abstract: The invention relates to a method for producing granulated porous corundum having a homogeneous porous structure with a total pore volume of 0.3 to 1.0 cm.sup.3 /g and predominant pore size of 5000 to 30000 A. The method comprises subjecting the granules of active alumina or aluminum hydroxide having a porous structure with a total pore volume of 0.3 to 1.0 cm.sup.3 /g and pore size of 20 to 5000 A to heat treatment by increasing the temperature from 20.degree.C to 700.degree.C during a period of at least 0.5 hour, thereafter the granules are heat treated at a temperature range of from 700.degree.C to 1000.degree.C for at least 0.5 hour, and then at a temperature range of from 1000.degree.C to 1400.degree.C for at least 0.5 hour, the heat treatment in the temperature range of from 20.degree.C to 1000.degree.C being carried out in an atmosphere of hydrogen fluoride which is present in amounts of from 0.01 to 2.0 percent of the weight of active alumina.

Abstract: This invention relates to absorbents which are particularly useful for the treatment of sulphur-containing oxides. These absorbents are made from materials containing aluminium oxide by steps including leaching an oxide-containing material, such as bauxite, with an alkaline solution; separating the resultant leach liquor; and drying the liquor. If desired alkali metal carbonate may be added to the liquor between the steps of separation and drying.

Abstract: High surface area alumina bodies for use as catalysts, catalyst carriers, and sorbents are made by controlled mixing of fine particle size platy boehmite alumina aggregates with a monobasic acid to produce non-pasty free-flowing particulate mass of aggregates of boehmite. This mass can then be formed by pressure into selected shapes such as rings, saddles, cylinders, solid, or hollow, or pellets, dried and fired to produce bodies of boehmite, gamma alumina, delta alumina, theta alumina or alpha alumina ranging in surface area of from 10 square meters per gram to greater than 300 square meters per gram. Catalytic metal can be included in the bodies by impregnation, before or after firing, or can be incorporated by inclusion in the aqueous acid treating solution.

Abstract: A method of manufacturing high surface area spheroidal alumina particles. A finely divided eta alumina is admixed and suspended in an alumina hydrosol and the mixture thereafter converted to spheroidal particles comprising eta and gamma alumina by the oil-drop method. The alumina spheres are particularly useful as a high surface area support or carrier material for catalytic components, and as a high surface area adsorbent.