Insight into the effects of calcination temperature on the structure and performance of RuO2/TiO2 in the Deacon process

摘要

Rutile-type TiO2 supported RuO2 (RuO2/TiO2) catalysts show a remarkable low-temperature activity and a long lifetime and have been industrially applied in the oxidation of HCl with O2 to Cl2, i.e., the Deacon process. The calcination of the as-prepared samples is crucial for the catalytic performance of the resultant catalysts. However, the effects of calcination temperature on the structure and performance of RuO2/TiO2 catalysts have not been systematically investigated yet. In the present work, several RuO2/TiO2 catalysts were prepared via a dry impregnation method and subsequently calcined at different temperatures. Various techniques were then employed to characterize the RuO2/TiO2 catalysts that were evaluated in the Deacon process. The results show that the structure and performance of these Deacon catalysts is closely related to the calcination temperature for the catalyst preparation. The resultant RuO2/TiO2 catalyst from a calcination temperature of 250 °C shows the highest catalytic activity due to RuO2 being well dispersed on TiO2, leading to the largest amount of surface RuO2. The current study, therefore, not only elucidates the effects of calcination temperature on the structure and performance of RuO2/TiO2 catalysts but also provides some guidance for developing an efficient catalyst in the Deacon process.