Conclusions The reduction of TiOz surfaces by hydrogen is a facile process at 298 K if Rh is present on the surface. No similar processes are detected when TiOz alone is exposed to H2 at 298 K. The reduction is postulated to occur via production of hydrogen atoms which spillover to the support, resulting in the formation of Ti3+ 0H-units. The process is partially reversible, as seen by the effect of outgassing on the ESR spectrum of this material. Two ...
