Pyrogenic titanium dioxide
AssigneeBASF SE
InventorsEberhard Fuchs, Klemens Flick
Life of this patent
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Abstract
Shaped materials useful as catalyst for preparing cyclic lactams by reacting aminocarbonitriles with water in the liquid phase in a fixed bed reactor and which have no soluble constituents under the reaction conditions, comprising pyrogenic titanium dioxide as essential constituent, these compositions being obtainable by shaping the pyrogenic titanium dioxide into shaped articles and, before or after the shaping, treating the pyrogenic titanium dioxide with from 0.1 to 30% by weight, based on the pyrogenic titanium dioxide, of an acid in which pyrogenic titanium dioxide is sparingly soluble.
Claims2
Shaped materials, comprising pyrogenic titanium dioxide as essential constituent, said shaped materials being obtainable by shaping the pyrogenic titanium dioxide into shaped articles and, before or after said shaping, treating the pyrogenic titanium dioxide with from 0.1 to 30% by weight, based on the pyrogenic titanium dioxide, of nitric acid, acetic acid or formic acid.
Dependencies are inferred from the claim text.