Photocatalytic activity of TiO2-WO3 mixed oxides in formic acid oxidation

•Ti-W mixed oxide photocatalysts were prepared by the sol-gel method and calcined.•W addition induced TiO2 anatase phase stabilization up to calcination at 700°C.•Atomically dispersed tungsten is incorporated into the titania lattice.•Best photocatalytic performances were attained with a W/Ti molar ratio of 1%.