Granules based on titanium dioxide pyrogenically process for their preparation and their use.

GRANULES BASED ON SILICON DIOXIDE WITH DATA CHARACTERISTIC: AVERAGE GRAIN DIAMETER 10 MICRON TO 120 BET surface: 40 to 300 M SUP {2} / G Pore volume: 0.5 to 2.5 ml / G POROS size distribution: less than 5% VOLUME FULL pores have a pore diameter less than 5 NM, the rest have mesopores and macropores pH value: 3.6 to 8.5 DENSITY tamping: 220 TO 700 G / L are prepared in such a way that silicon dioxide dispersed in water, dried by spraying, will eventually tempers and / or subjected to silanization. THE GRAVEL suitable as catalyst supports.