| abstract |
A process for the preparation of a TiO 2 -containing catalyst or catalyst support which is stable to high temperatures is described. In this processn an aqueous Ti-containing solution having a concentration of dissolved Ti equivalent to 10 to 250 g TiO 2 per liter of solution is added to a suspension of not more than 10 wt. % strength of a finely disperse inorganic support material in water, the inorganic support material having a specific surface area, measured by the BET method, of >20 m 2 /g and any primary particle agglomerates present having a particle size of d 50 <10 μm, preferably <5 μm, the rate of addition of the Ti-containing solution to the suspension being chosen such that an addition equivalent to 0.05 g TiO 2 per m 2 of support surface and hour is not exceeded, the TiO 2 is precipitated on the inorganic support and the product obtained is filtered, washed and calcined. nn Alternatively, the TiO 2 -containing catalysts or catalyst supports which are stable to high temperatures can be prepared by a process in which 1. hydrated precursors of one or more metal oxides or semi-metal oxides and 2. hydrated titanium oxide are rapidly precipitated from aqueous solution. |