Abstract
An active Rh/TiO2-VO2 catalyst for the dealklylation was found in a study of catalytic activities of the Rh/VO2 catalytic systems. A Rh/TiO2-VO2 catalyst (Rh : 1 wt%, Ti/V =95/5 atomic ratio) prepared with TiO2 as a support and with tris(acetylacetonato)rhodium (III) showed a high activity for the dealkylation at 450°C. This catalyst also showed a high activity for the steam reforming of heptane at low temperatures (450 and 500°C). Results of pulse reactions of CO with catalyst and of those of CH4, with catalyst suggested that the water molecule adsorbed on the catalyst were transformed into hydrogen and surface oxygen. Measurements of electromotive force in the CO-catalyst system demonstrated that both the surface concentration and the oxidzing power of the surface oxygen were larger on the Rh/TiO2-VO2 catalyst than those of the surface oxygen on the original Rh/VO2 catalyst.
