Catalytic combustion of chlorobenzene over Ru-doped ceria catalysts

CeO2 and Ru doped CeO2 nanoparticles with small particle sizes (∼7 nm) and high surface area (∼100 m2 g−1) were prepared by a simple precipitation/coprecipitation method and aqueous NaOH solution (10 wt%) as the precipitating agent, and characterized by XRD, N2 adsorption, TEM/HRTEM, Raman, XPS and H2-TPR. The catalytic combustion of chlorobenzene (CB) was investigated for the first time. The results revealed that the Ru doped CeO2 catalysts exhibit an outstanding catalytic activity (T90% below 250 °C) and stability (at least 82 h at 275 °C) for CB decomposition. The better stability of the Ru-CeO2 catalysts can be ascribed to the inorganic chlorine species or dissociative Cl adsorbed on active sites can be removed rapidly via the Deacon process catalysized by RuO2 component with extraordinary stability (limited chlorination and easier Cl2 evolution).

Ru doped CeO2 catalysts were prepared by a simple coprecipitation method and 10 wt.% NaOH solution as the precipitating agent. It was found that the Ru-CeO2 catalysts showed an outstanding catalytic activity (T90% below 250 °C and stability (at least 80 h at 275 °C for catalytic combustion of chlorobenzene. The better stability of the Ru based catalysts can be ascribed to the inorganic chlorine species adsorbed on active sites can be removed rapidly via the Deacon process catalysized by RuO2 component. Figure optionsDownload as PowerPoint slideHighlights▸ Ru doped CeO2 was prepared by a coprecipitation method and 10 wt.% NaOH as the precipitating agent. ▸ The catalytic combustion of chlorobenzene was investigated over Ru-CeO2 for the first time. ▸ Ru-CeO2 showed an outstanding activity and stability for chlorobenzene decomposition. ▸ The better stability can be ascribed to the dissociactive Cl can be removed via the Deacon process.