Abstract:
Three-sheet minerals such as montmorillonite and montmorillonite based clays are acid treated to produce adsorbents having a silica content of at least 80 percent by weight and a crystal lattice structure that is substantially X-ray amorphous due to removal of the octahedral sheet that is predominantly built up of iron and aluminum ions.
Abstract:
A HYDROCARBON CONVERSION CATALYST COMPRISING A CRYSTALLINE ZEOLITIC MOLECULAR SIEVE CRACKING COMPONENT, 0.01 TO 2.0 WEIGHT PERCENT, BASED ON SAID CRACKING COMPONENT AND CALCULATED AS THE METAL, OF A HYDROGENATING COMPONENT SELECTED FROM PLATINUM, PALLADIUM AND IRIDIUM AND COMPOUNDS OF PLATINUM, PALLADIUM AND IRIDIUM AND 0.01 TO 2.0 WEIGHT PERCENT, BASE ON SAID CRACKING COMPONENT AND CALCULATED AS THE METAL, OF A HYDROGENATING COMPONENT SELECTED FROM THE GROUP CONSISTING OF RHENIUM AND COMPOUNDS OF RHENIUM.
Abstract:
The preparation of active alumina agglomerates of highmechanical strength and low-active surface consisting of treating pellets of alumina in an autoclave in an acidic medium at a temperature above 100* to 250* C. for a time within the range of 1-20 hours, followed by drying the treated pellets and calcining the dried pellets at elevated temperature.
Abstract:
A method for producing high-porosity, high-surface area, lowbulk density alumina by drying aqueous alumina mixtures with an alkanol vapor. The alumina product after drying has a surface area from about 260 to 400 m2/g, a pore volume from about 1.0 to about 2.75 cc/g, and a loose-bulk density from about 7.5 to about 25 lb/ft3. The alkanol vapor is selected from the vapors of alkanols containing from about 1 to about 8 carbon atoms.
Abstract:
A method for converting high-density, low-porosity alumina into low-density, high-porosity alumina by dispersing said highdensity, low-porosity alumina in an acidic aqueous solution and thereafter precipitating alumina by adjusting the pH of the dispersion to a value from about 7 to about 11. The precipitated alumina is then admixed with an organic solvent having a lower surface tension than water and dried to produce a low-density, high-porosity alumina.