Silicon-titanium mixed oxide powder, dispersion thereof and derived titanium-containing zeolite

Fumed silicon-titanium mixed oxide powder, with · A BET surface area of 200 to 400 m · A ratio of DBP number / BET surface area of ​​0.5 to 1.2, · A silica content from 93.5 to 95.4 wt .-%, and · A titanium dioxide share of 4.6 to 6.5 weight .-%, wherein the sum of the contents is greater than 99.7 wt .-%. Dispersion containing the fumed silicon-titanium mixed oxide powder. A process for producing a titanium-containing zeolites starting from powder or dispersion.