Compacts based on pyrogenically produced oxides
AssigneeDegussa AG
InventorsKlaus Deller, Helmfried Krause, Roland Burmeister
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Abstract
Compacts produced from a pyrogenically produced oxide, magnesium stearate, methyl cellulose and urea are mixed together in the presence of water, compacted, dried, comminuted to a powder, and the powder is pressed with an isostatic press to compacts and the compacts tempered. The resulting compacts have an outside diameter of 16 to 100 mm.
Claims19
A shaped compact comprising a pyrogenically produced oxide having an outside diameter of 16 to 100 mm and a fracture strength of 1.5 to 12 KN.
A catalyst which is a shaped compact of pyrogenically produced oxides having an outside diameter of 16 to 100 mm and a fracture strength of 1.5 to 12 KN.
A method of making a compact suitable for use as a catalyst comprising:
- mixing a pyrogenically produced oxide
- with at least one member selected from the group consisting of magnesium stearate,
- methyl cellulose, and
- urea,
- adding water and compacting the mixture resulting therefrom to form a compacted mixture, drying said compacted mixture, comminuting said compacted mixture to a powder, pressing said powder with an isostatic press at a pressure of 25 to 650 bar, or pressing with an axial press having a force of 1 to 50 tons to form a compact, and tempering said compact at a temperature ranging from room temperature to 1200.degree. C. for 11-17 hours.
A compact based pyrogenically produced oxide produced by a method comprising a pyrogenically produced of oxide, and a member selected from the group consisting of magnesium stearate, methyl cellulose, urea and mixtures thereof in the presence of water, to form a mixture, compacting said mixture to form a compacted mixture, drying said compacted mixture to form a dried mixture, comminuting said dried mixture to form a powder and pressing the powder with an isostatic press at a pressure of 25 to 650 bar, or pressing by means of an axial press with a pressing force of 1 to 50 tons to form a compact, and tempering said compact formed thereby at a temperature graduated in time in a range extending from room temperature to 1200.degree. C. or 11-17 hours.
A spherically shaped compact comprising a pyrogenically produced oxide having an outside diameter of 16 to 100 mm and a fracture strength of 1.5 to 12 KN.
Dependencies are inferred from the claim text.