EPR study of the interaction of sulpher dioxide, chlorine and hydrogen chloride with transition metal impregnated rutile TiO2

Article abstract of DOI:10.1007/BF03372164

The effect of the exposure of sulphur dioxide (SO₂), chlorine (Cl₂) and hydrogen chloride (HCl) to both chromium and copper surface-impregnated rutile titanium dioxide has been investigated. The formation of complexes between the surface-bound ions and the reagent gases is proposed to occur at room temperature. In the case of SO₂, further reaction is found to occur, and a new paramagnetic species is formed bound to the rutile surface. It is proposed to be the superoxide radical anion. This breakdown of SO₂ is demonstrated by both the chromium and copper impregnated TiO₂ systems.