Patent ID: 6660243
Filing Date: 2003-12-09
Classification: B01J,C04B

Abstract:
Process for the production of moulded bodies of titanium dioxide with a mean grain size d50 of 0.01 to 50 mm, that are composed in each case of primary crystallites of titanium dioxide in the anatase modification with a crystallite size according to Scherrer of up to 40 nm and that have a specific surface determined according to the BET method of 20 to 150 m2/g, a pore volume of 0.1 to 0.45 cm3/g, and a pore diameter of 100 to 300 Ã¥, characterised in that the titanium dioxide powder is pre-processed at a temperature of 120Â° to 250Â° C. and under a pressure of 2 to 40 bar for a duration of 0.1 to 30 hours in the presence of water and is then dried, the moulded bodies produced from a paste-like mixture of the thus pretreated titanium dioxide powder and titanium dioxide sol and/or 1 to 20% nitric acid are dried and are then annealed at a temperature of 400Â° to 1000Â° C. for a duration of 0.5 to 3.5 hours, preferably 1.5 to 2.5 hours.