PRESSED BODIES BASED ON PYROGENIC TITANIUM DIOXIDE, PROCESS FOR THEIR PREPARATION AND THEIR USE

摘要

Pressed bodies based on pyrogenic titanium dioxide, having the following physical-chemical data: External diameter 0.8 - 15 mm BET surface area according to DIN 66 131 < 1 - 20 m<2>/g Pore volume 0.01 - 0.29 cm<3>/g Pore distribution : no pores of < 10 nm, at least 90% of the pores in the range 10 - 80 nm Breaking strength 30 - 500 N/pressed body Rutile-phase TiO2 100% composition > 99.5% of TiO2 They are prepared by mixing pyrogenic titanium dioxide with urea, graphite and water, compacting, drying and comminuting, if desired, the resulting mass at 80 to 120 DEG C, then extruding or tabletting it and tempering the resulting pressed bodies at a temperature from 710 to 1000 DEG C for a period from 0.5 to 6 hours. The pressed bodies can be used as a catalyst or catalyst support.