| Summary: | WO<sub>3</sub>/V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> (W<sub>x</sub>V<sub>5</sub>TiO<sub>2</sub>) catalysts were prepared via a wet incipient method with a V/Ti mass ratio = 0.05 and a W/Ti mass ratio varying from 0 to 0.10. The catalysts were calcined in air for 24 h at temperatures of 400 °C, 500 °C, 550 °C, and 600 °C. The presence of WO<sub>3</sub> on W<sub>x</sub>V<sub>5</sub>TiO<sub>2</sub> catalysts inhibits morphological and crystal structure transformations as the calcination temperature increases from 400 °C to 600 °C. The results of this study give evidence that the active component of the catalyst is V on anatase TiO<sub>2</sub>. Therefore, the incorporation of WO<sub>3</sub> onto an anatase TiO<sub>2</sub> support widens the temperature range at which the WO<sub>3</sub>/V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> catalyst maintains the anatase crystal structure and, hence, the performance of the catalyst. The catalytic oxidation of dimethyl sulfide (DMS) was used as a probe reaction to evaluate catalytic activity. The results indicate that WO<sub>3</sub>/V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> catalysts are capable of effectively oxidizing DMS at relatively low reaction temperatures (250 °C), even under conditions of an elevated DMS concentration in air (1.6 vol%).
|
|---|
