The photocatalytic decomposition of yperite (bis (2-chloroethyl) sulfide), a chemical warfare agent, was achieved by using titania–silica catalysts doped with several transition metal ions. The preparation of these catalysts was achieved by impregnation of a titania–silica mixed oxide previously synthesized using a sol-gel route with salts of the doping elements (vanadium, iron, manganese). The above catalysts were characterized using several ...