VANADIUM-DOPED TIO2 CATALYSTS - A UNIFYING PICTURE OF POWDERS AND SUSPENSIONS

Anatase powders, both pure and vanadium-doped, were subjected to acid- base leaching cycles. The different samples were characterized with re spect to chemical composition, morphology and surface area. The effect s of the different treatments on the chemical state of the surface and on the electrification at the solid-solution boundary were investigat ed, respectively, by X-ray photoelectron spectroscopy and electrophore tic mobility measurements. The stability of the aqueous suspensions wa s measured by sedimentation tests. The results of the different determ inations are cross-compared in order to produce a general description of the catalysts.