Catalytic Wet Air Oxidation of PH3 over CuO-CeO2 Catalysts

The influences of CeO₂ and La₂O₃ on catalytic wet air oxidation of PH₃ was investigated. CuO catalysts, CuO-CeO₂ catalysts and CuO-La₂O₃ catalysts were prepared using the co-precipitation method. Results revealed that the purification efficiency of PH₃ removed by the combination of Ce and Cu oxide was good. The catalystic activity of CuO-CeO₂ catalysts influenced by the ratio of Cu to Ce was studied, the optimalizing ratio was 10:1. Main influence factors for reaction temperature, O₂ content and gas flow rate were also studied, the purification efficiency of PH₃ was enhanced with reaction temperature increasing, slow gas flow was good for removing PH₃. O₂ 2% were best for the reaction. The results indicated that good conditions of the reaction were 80°C, gas flow rate of 200 mL/min, O₂ content of 3%.