TITANIUM DIOXIDE HAVING A VARIABLE SINTERING STABILITY

摘要

Crystalline titanium dioxide powder in the form of aggregated primary particles having a BET surface area of 70-100 m²/g and a rutile content of > 10-40%. It is obtained by introducing titanium tetrachloride vapour and, separately therefrom, hydrogen, air or oxygen-enriched air into a mixing chamber, subsequently igniting the mixture of titanium tetrachloride vapour, hydrogen and primary air in a burner and burning the flame into a reaction chamber and subsequently separating off the solid from gaseous substances, where the amounts used are selected so that the equation A = 10⁵{ [ (TiC1₄ x H₂) /(amount of air x total gas)] /BET] } where A = 0.1 to 0.4 is obeyed. The titanium dioxide powder can be used as catalyst and catalyst support.