Iron oxide and silicon dioxide-titanium dioxide mixed oxide

Iron oxide-silicon dioxide-titanium dioxide mixed oxide which consists of a pyrogenically-produced iron oxide-silicon dioxide-titanium dioxide mixed oxide with a specific surface of 10 to 200 m2/g, which contains 0.5 wt. % to 50 wt. % iron oxide and 0.5 wt. % to 50 wt. % of silicon dioxide in relation to the total quantity, as a constituent of the mixed oxide.