Activity and sulfur resistance of CuO/SnO₂/PdO catalysts supported on γ-Al₂O₃ for the catalytic combustion of benzene

In this paper, five types of catalysts, (i.e. SnO₂/PdO/γ-Al₂O₃, CuO/PdO/γ-Al₂O₃, PdO/γ-Al₂O₃, CuO/SnO₂/γ-Al₂O₃ and CuO/SnO₂/PdO/γ-Al₂O₃) were prepared by multiple step impregnation for the catalytic combustion of benzene. The catalysts were characterized by XRD, BET, H₂-TPR and IR to investigate the internal structural and textural changes. The results indicated that the addition of copper to Pd-containing catalyst could promote the catalytic activity, and the addition of tin was beneficial for promoting the sulfur resistance of catalysts but did not bring any benefit to activity. In addition, the CuO/SnO₂/PdO catalyst exhibited better sulfur resistance and catalytic activity than the other prepared catalysts which was attributed to the addition of both copper and tin.